Zeitschriftenartikel zum Thema „New Zealand waterways“

The scale and intensity of dairy farming can place pressure on our freshwater resources. These pressures (e.g. excessive soil nutrient concentrations and nitrogen excretion) can lead to changes in the levels of contaminants in waterways, altering the state and potentially affecting the uses and values society ascribes to water. Resource management involves putting in place appropriate responses to address water-quality issues. In the present paper, we highlight trends in the scale and extent of dairying in Australia and New Zealand and describe water-quality pressures, state, impacts and responses that characterise the two countries. In Australia and New Zealand, dairy farming has become increasingly intensive over the past three decades, although the size of Australia’s dairy herd has remained fairly static, while New Zealand’s herd and associated excreted nitrogen loads have nearly doubled. In contrast, effluent management has been improved, and farm waterways fenced, in part to reduce pressure on freshwater. However, both countries show a range of indicators of degraded water-quality state. Phosphorus and nitrogen are the most common water-quality indicators to exceed levels beyond the expected natural range, although New Zealand also has a significant percentage of waterways with faecal contaminants beyond acceptable levels for contact recreation. In New Zealand, nitrate concentrations in waterways have increased, while phosphorus and suspended sediment concentrations have generally decreased over the past decade. Water quality in some coastal estuaries and embayments is of particular concern in Australia, whereas attention in New Zealand is on maintaining quality of high-value lakes, rivers and groundwater resources, as well as rehabilitating waterbodies where key values have been degraded. In both Australia and New Zealand, water-quality data are increasingly being collated and reported but in Australia long-term trends across waterbodies, and spatially comprehensive groundwater-quality data have not yet been reported at national levels. In New Zealand, coastal marine systems, and particularly harbours and estuaries, are poorly monitored, but there are long-term monitoring systems in place for rivers, groundwater and lakes. To minimise pressures on water quality, there is a high reliance on voluntary and incentivised practice change in Australia. In New Zealand, industry-led practice change has been important over the past decade, but regulated environmental limits for dairy farmers are increasing. Dairy industries in both countries have set targets for reducing pressures through sustainability frameworks and accords. To address future drivers such as climate change and increasing domestic and international market demand for sustainability credentials, definitions of values and appropriate targets for waterbodies draining agricultural landscapes will be required. Environmental limits (both natural and societal) will constrain future growth opportunities for dairying and research into continued growth within limits remains a priority in both countries.

Abstract Daily rainfall totals are a key input for hydrological models that are designed to simulate water and pollutant flow through both soil and waterways. Within New Zealand there are large areas and many river catchments where no long-term rainfall observations exist. A method for estimating daily rainfall over the whole of New Zealand on a 5-km grid is described and tested over a period from January 1985 to April 2002. Improvement over a spatial interpolation method was gained by scaling high-elevation rainfall estimates using simulated mesoscale model rainfall surfaces that are generated for short periods in 1994 and 1996. This method is judged to produce reasonable and useful estimates of daily rainfall.

Plant pathogenic strains of Pseudomonas syringae were isolated from lakes and rivers in the central North Island of New Zealand These strains were identified by their ability to produce a fluorescent pigment on a modified Kings B medium by their ability to cause a hypersensitive reaction when infiltrated into tobacco plant and by the absence of a cytochrome c oxidase Different aspects of the protocol used to isolate these strains have been assessed Some of the strains isolated and in some cases the majority of them were resistant to copper and/or streptomycin Significantly these plant pathogenic bacteria were isolated from waterways in areas where no agriculture or horticulture is present and waterways used for crop irrigation These results suggest that natural waterways could be a source of inoculum of plant pathogenic bacteria and a source of genes that confer streptomycin resistance and/or copper resistance to these bacteria

The complex interactions and ruptures between contemporary settler colonialism, environmental ethics, and Indigenous rights and worldviews often emerge in projects of civil engineering. The continued capture, control and burial of natural water courses in Aotearoa-New Zealand is a case in point, and exemplifies a failure to stay abreast of evolving understandings and renewed relationships we seek with our waterways, our ancestors. Wai-Horotiu stream used to run down what is now Queen Street, the main road in Auckland, Aotearoa-New Zealand’s largest city. Treasured by Māori as a source of wai (water) and mahinga kai (food), it is also the home of Horotiu, a taniwha or ancestral guardian—a literal ‘freshwater body’. However, as Tāmaki-Makaurau transitioned into Auckland city, Wai-Horotiu became denigrated; used as an open sewer by early settlers before being buried alive in the colonial process. How, now, can we know this buried waterway? Te Awa Tupua Act 2017 that affords the Whanganui River juristic personality and moral considerability offers one possible solution. It acknowledges that waterways, incorporating all their physical and metaphysical elements, exist in existential interlinks with Māori as part of their whakapapa (genealogical networks). This paper asks, can a corresponding and appropriate ethics of association and care be fostered in and expressed by the political descendants of British settlers (Pākehā) and later immigrants who live here under the auspices established by Te Tiriti o Waitangi in 1840? Here is a conversation between a Māori earth systems scientist and a Pākehā interdisciplinary scholar. Where Hikuroa speaks from and to direct whakapapa connections, beginning with pepeha, Lythberg’s narrative springboards from public art projects that facilitate more ways of knowing Wai-Horotiu. Together, we contend that a regard for Indigenous relationships with water can guide best practice for us all, and propose that creative practices can play a role in attaching people to place, and to waterways.

The New Zealand flora comprises proportionately more alien species than anywhere else on Earth. Many of these species are ‘sleeper’ species, currently not invasive but with the potential to become so. Understanding what traits lead to sleepers becoming invasive is a key question in invasion biology. One hypothesis is local adaptation — that is, selection pressures in an alien habitat select for certain genetic traits favouring species spread. In New Zealand, the semi-aquatic herb Mimulus gutattus, ‘monkey flower’, is already showing signs of becoming invasive and is widespread across the South Island, blocking waterways and ditches. A common garden experiment was used to test for local adaptation in 37 populations of monkey flower from 8 regions across the North and South Islands of New Zealand. Possible adaptations in plant physiology (including, fresh vs dry weight, flower size, and photosynthetic rate) were examined. Observable differences include significant differences in biomass and leaf morphology. Results to date indicate significant genetic differences among New Zealand monkey flower populations. This is indicative of invasive potential.

New Zealand is unique in that half of its national greenhouse gas (GHG) inventory derives from agriculture - predominantly as methane (CH4) and nitrous oxide (N2O), in a 2:1 ratio. The remaining GHG emissions predominantly comprise carbon dioxide (CO2) deriving from energy and industry sources. Proposed strategies to mitigate emissions of CH4 and N2O from pastoral agriculture in New Zealand are: (1) utilising extensive and riparian afforestation of pasture to achieve CO2 uptake (carbon sequestration); (2) management of nitrogen through budgeting and/or the use of nitrification inhibitors, and minimizing soil anoxia to reduce N2O emissions; and (3) utilisation of alternative waste treatment technologies to minimise emissions of CH4. These mitigation measures have associated co-benefits and co-costs (disadvantages) for rivers, streams and lakes because they affect land use, runoff loads, and receiving water and habitat quality. Extensive afforestation results in lower specific yields (exports) of nitrogen (N), phosphorus (P), suspended sediment (SS) and faecal matter and also has benefits for stream habitat quality by improving stream temperature, dissolved oxygen and pH regimes through greater shading, and the supply of woody debris and terrestrial food resources. Riparian afforestation does not achieve the same reductions in exports as extensive afforestation but can achieve reductions in concentrations of N, P, SS and faecal organisms. Extensive afforestation of pasture leads to reduced water yields and stream flows. Both afforestation measures produce intermittent disturbances to waterways during forestry operations (logging and thinning), resulting in sediment release from channel re-stabilisation and localised flooding, including formation of debris dams at culverts. Soil and fertiliser management benefits aquatic ecosystems by reducing N exports but the use of nitrification inhibitors, viz. dicyandiamide (DCD), to achieve this may under some circumstances impair wetland function to intercept and remove nitrate from drainage water, or even add to the overall N loading to waterways. DCD is water soluble and degrades rapidly in warm soil conditions. The recommended application rate of 10 kg DCD/ha corresponds to 6 kg N/ha and may be exceeded in warm climates. Of the N2O produced by agricultural systems, approximately 30% is emitted from indirect sources, which are waterways draining agriculture. It is important therefore to focus strategies for managing N inputs to agricultural systems generally to reduce inputs to wetlands and streams where these might be reduced to N2O. Waste management options include utilizing the CH4 resource produced in farm waste treatment ponds as a source of energy, with conversion to CO2 via combustion achieving a 21-fold reduction in GHG emissions. Both of these have co-benefits for waterways as a result of reduced loadings. A conceptual model derived showing the linkages between key land management practices for greenhouse gas mitigation and key waterway values and ecosystem attributes is derived to aid resource managers making decisions affecting waterways and atmospheric GHG emissions.

Waterways can contribute to the beauty and livelihood of urban areas, but maintaining their hydro-ecosystem health is challenging because they are often recipients of contaminated water from stormwater runoff and other discharges. Public awareness of local waterways’ health and community impacts to these waterways is usually poor due to of lack of easily available information. To improve community awareness of water quality in urban waterways in New Zealand, a web portal was developed featuring a real-time waterways monitoring system, a public forum, historical data, interactive maps, contaminant modelling scenarios, mitigation recommendations, and a prototype contamination alert system. The monitoring system featured in the web portal is unique in the use of wireless mesh network technology, direct integration with online modelling, and a clear target of public engagement. The modelling aims to show the origin of contaminants within the local catchment and to help the community prioritize mitigation efforts to improve water quality in local waterways. The contamination alert system aims to keep managers and community members better informed and to provide a more timely response opportunity to avert any unplanned or accidental contamination of the waterways. Preliminary feedback has been positive and is being supported by local and regional authorities. The system was developed in a cost-effective manner providing a community focussed solution for quantifying and mitigating key contaminants in urban catchments and is applicable and transferable to other cities with similar stormwater challenges.

The emergence of clinically significant antimicrobial resistance (AMR) in bacteria is frequently attributed to the use of antimicrobials in humans and livestock and is often found concurrently with human and animal pathogens. However, the incidence and natural drivers of antimicrobial resistance and pathogenic virulence in the environment, including waterways and ground water, are poorly understood. Freshwater monitoring for microbial pollution relies on culturing bacterial species indicative of faecal pollution, but detection of genes linked to antimicrobial resistance and/or those linked to virulence is a potentially superior alternative. We collected water and sediment samples in the autumn and spring from three rivers in Canterbury, New Zealand; sites were above and below reaches draining intensive dairy farming. Samples were tested for loci associated with the AMR-related group 1 CTX-M enzyme production (blaCTX-M) and Shiga toxin producing Escherichia coli (STEC). The blaCTX-M locus was only detected during spring and was more prevalent downstream of intensive dairy farms. Loci associated with STEC were detected in both the autumn and spring, again predominantly downstream of intensive dairying. This cross-sectional study suggests that targeted testing of environmental DNA is a useful tool for monitoring waterways. Further studies are now needed to extend our observations across seasons and to examine the relationship between the presence of these genetic elements and the incidence of disease in humans.

Boxy and with ‘unseaworthy form’, the sailing scow was not the most aesthetically pleasing of watercraft. Yet the durable hull design based upon European predecessors found a new home in North America where it proliferated on the Atlantic, Gulf, Pacific and Great Lakes coasts because of its practicality for largely unimproved waterways. Scows were widely used on the Great Lakes in the nineteenth century, moving beyond shallow waters and gaining a reputation for reliability in long-distance trade. Late in the century, the technology arrived in New Zealand, where it prospered in a niche market that combined open water voyages and shallow river, port, or beach loading and unloading. The Great Lakes scows presented an alternative for entry into ship ownership on the North American frontier. The development of the New Zealand scow confirmed these findings comparatively in an international context during the late nineteenth and early twentieth centuries.

Waterways worldwide are experiencing nutrient enrichment from population growth and intensive agriculture, and New Zealand is part of this global trend. Increasing fertilizer in New Zealand and intensive agriculture have driven substantial water quality declines over recent decades. A recent national directive has set environmental managers a range of riverine ecological targets, including three macroinvertebrate indicators, and requires nutrient criteria be set to support their achievement. To support these national aspirations, we use the minimization-of-mismatch analysis to derive potential nutrient criteria. Given that nutrient and macroinvertebrate monitoring often does not occur at the same sites, we compared nutrient criteria derived at sites where macroinvertebrates and nutrients are monitored concurrently with nutrient criteria derived at all macroinvertebrate monitoring sites and using modelled nutrients. To support all three macroinvertebrate targets, we suggest that suitable nutrient criteria would set median dissolved inorganic nitrogen concentrations at ~0.6 mg/L and median dissolved reactive phosphorus concentrations at ~0.02 mg/L. We recognize that deriving site-specific nutrient criteria requires the balancing of multiple values and consideration of multiple targets, and anticipate that criteria derived here will help and support these environmental goals.

The New Zealand deer industry is growing rapidly and the development of sustainable management practices for deer farming is becoming increasingly important. The main environmental issues facing the deer industry are the eff ects on soil and water quality, exacerba ted by the behaviour responses of deer to confinement (in particular fence pacing and wallowing). In addition, the projected increase in greenhouse gas emissions from deer farming from about 1.5% of the total emissions in 1990 to an estimated 7% in 2010 is of particular concern if the Kyoto Protocol is ratified. Although the potential effects of deer farming on the environment are well recognised, very little experimental work has qualified the extent of these impacts. The future of intensive deer farming in New Zealand will not only depend on the successful development of sustainable management practices, but also on the implementation and adoption of these practices, which will be influenced by the balance between the costs and the benefits to the New Zealand deer farmer. The development and adoption of sustainable management practices for deer farming requires quantification of rates of sediment, nutrient and faecal contaminant movement to waterways, the impact of soil compaction and greenhouse gas emissions, as well as an assessment of the economic implications. Keywords: deer farming, greenhouse gas emissions, nutrient losses, sediment losses, soil compaction, soil erosion, water quality

A Moral Truth: 150 years of Investigative Journalism in New Zealand, edited by James Hollings. Auckland: Massey University Press. 2017. 448 pages. ISBN: 978-0-9941-4158-3TWO executions 40 years apart; the country’s worst aviation disaster; people wrongly imprisoned; the plight of tenants in slum housing; the pollution of our waterways; health scandals resulting in deaths; corporate scandals, sometimes likewise; and so much more. They are all examples of the investigative journalism to be found in this book, in fact 33 fascinating examples.

Land application of animal waste can result in bacterial contamination of shallow groundwater and/or waterways. Using 500-mm-diameter barrel lysimeters, we investigated the potential for bacterial indicators to leach through 4 New Zealand soils treated with dairy shed effluent (DSE). DSE was applied to soil lysimeters containing poorly drained Gley Soils (Te Kowhai and Netherton) and well-drained Allophanic (Waihou) and Pumice Soils (Atiamuri) at 50 mm/h, a typical field application rate used by farmers. Simulated rainfall was applied continuously at a rate of 5–10 mm/h, and leachate collected at a depth of 700 or 750 mm was analysed for faecal coliforms, Escherichia coli, and faecal enterococci. Bacterial indicators of faecal contamination readily moved through the Te Kowhai and Netherton soils, but not the Waihou and Atiamuri soils. Differential microbial movement was attributed to differences in soil structure. The poorly drained soils have coarse subsoil structures with macropores, favouring bypass flow. In contrast, the welldrained soils have a finer, more uniformly porous soil structure that minimised bypass flow and allowed matrix flow.

Abstract Lejeunea subelobata Carrington & Pearson has been regarded as a synonym of L. drummondii Taylor, but the two species differ in patterns of variation in lobule morphology, shapes of the gynoecial bracteole, female bract underleaf and vegetative underleaves; in stem anatomy, and ecology. Lejeunea subelobata is a rheophyte from south-east Australia, Tasmania, and New Zealand that grows primarily as a lithophyte on rock within and around waterways, in association with basicolous substrates particularly basalt, rhyolite and andesite. Lobules in L. subelobata are always explanate, the female bract underleaf is obovate, underleaves are rotund and remote, and the stem medulla has 19-26 cells with small concave trigones. Lejeunea drummondii is, in its current circumscription, an ecologically and morphologically malleable taxon confined to Australia. The relationship between L. drummondii and plants from New Zealand described as L. epiphylla Colenso nom. illeg. requires further investigation.

ABSTRACTAvian feces contaminate waterways but contribute fewer human pathogens than human sources. Rapid identification and quantification of avian contamination would therefore be useful to prevent overestimation of human health risk. We used subtractive hybridization of PCR-amplified gull fecal 16S RNA genes to identify avian-specific fecal rRNA gene sequences. The subtracters were rRNA genes amplified from human, dog, cat, cow, and pig feces. Recovered sequences were related toEnterobacteriaceae(47%),Helicobacter(26%),Catellicoccus(11%),Fusobacterium(11%), andCampylobacter(5%). Three PCR assays, designated GFB, GFC, and GFD, were based on recovered sequence fragments. Quantitative PCR assays for GFC and GFD were developed using SYBR green. GFC detected down to 0.1 mg gull feces/100 ml (corresponding to 2 gull enterococci most probable number [MPN]/100 ml). GFD detected down to 0.1 mg chicken feces/100 ml (corresponding to 13Escherichia coliMPN/100 ml). GFB and GFC were 97% and 94% specific to gulls, respectively. GFC cross-reacted with 35% of sheep samples but occurred at about 100,000 times lower concentrations in sheep. GFD was 100% avian specific and occurred in gulls, geese, chickens, and ducks. In the United States, Canada, and New Zealand, the three markers differed in their geographic distributions but were found across the range tested. These assays detected four important bird groups contributing to fecal contamination of waterways: gulls, geese, ducks, and chickens. Marker distributions across North America and in New Zealand suggest that they will have broad applicability in other parts of the world as well.

A cross-sectional survey was conducted to determine the seroprevalence of Leptospira in a cohort of horses and to evaluate potential risk factors for Leptospira seropositivity in horses in New Zealand. The convenience sample included 499 Thoroughbred racing and breeding horses from 25 commercial properties in North Island, New Zealand. A questionnaire was used to collect demographic data on horses and property-level information on grazing and management practices, pest (rodent) management, access to natural waterways, other livestock on the property, and possible contact with wildlife. The microscopic agglutination test was used to test sera for serovars Ballum, Copenhageni, Hardjo (bovis), Pomona, and Tarassovi. Logistic regression was used to investigate the risk factors for Leptospira seropositivity to at least one serovar and for each serovar individually. A total of 124 (25%, 95% confidence interval (CI) 21–29%) horses had positive titres to any one of the five serovars. The seroprevalence of Ballum, Copenhageni, Hardjo (bovis), Pomona, and Tarassovi was 5% (95% CI 3–7%), 9% (95% CI 7–12%), 6% (95% CI 4–8%), 6% (95% CI 4–8%), and 6% (95% CI 4–8%), respectively. Broodmares, compared to racehorses and alternately grazing horses with sheep, increased the odds of exposure to any one serovar, whilst grazing the same time as sheep and alternately grazing horses with cattle increased the odds of exposure to Ballum and Hardjo (bovis), respectively. Historical exposure to Leptospira in racing and breeding horses was identified, and risk factors were consistent with pasture-based exposure.

The 4 million ha of hill country pastures in New Zealand grow mostly on steep slopes and soils of naturally low soil fertility. Pastures are based on approximately 25 exotic species introduced within the last 130 years after the forest was cleared and burnt. Despite the environmental constraints and naturalised species, hill country is a major contributor to agricultural exports. The landscape and the pastures are spatially diverse, with slope and aspect strongly influencing the abundance and production of pasture species. The number of pasture species present is relatively stable, but the relative abundance of high fertility grass species (e.g. perennial ryegrass, Lolium perenne), low fertility grass species (e.g. browntop, Agrostis capillaris) and legumes (e.g. white clover, Trifolium repens) can be shifted towards high fertility grass species and legumes through the interaction of phosphate fertiliser application and grazing decisions (that is, sheep versus cattle, stocking rate, grazing management). Increased proportions of desirable species and improved soil fertility and structure can support sustainable farming systems. There are challenges such as soil erosion and nutrient loss into waterways, but these are more readily managed when the pastoral system is productive and profitable. Keywords: slope, pasture condition, browntop, perennial ryegrass, soil characteristics

Faecal enterococci ecology outside the host is of great relevance when using these organisms as indicators of water quality. As a complement to New Zealand epidemiological studies of bathing water quality and health risk, a study of the environmental occurrence of these organisms has been undertaken. Specific concerns over the use of enterococci derive from the unique situation in New Zealand which has few chlorinated sewage effluents, a high ratio of grazing animals to humans, and significant inputs of animal processing effluents into the environment. Human and animal faecal wastes are the main sources, with 106–107cfu/100ml found in human sewage. Analysis of domestic and feral animal faeces found enterococci in the range of 101–106cfu/g with considerable variation between species. The latter observations support the notion that a considerable proportion of the load in urban/rural catchments and waterways (typically 102–103 enterococci cfu/100ml) is derived from non-human sources. Previous studies of enterococci quiescence in marine/fresh waters indicate that they enter a non-growth phase, exposure to sunlight markedly reducing culturability on selective and non-selective media. Enterococci were also found to survive/multiply within specific non-faecal environments. Enterococci on degrading drift seaweed at recreational beaches exceeded seawater levels by 2–4 orders of magnitude, suggesting that expansion had occurred in this permissive environment with resultant potential to contaminate adjacent sand and water. These studies suggest that multiple sources, environmental persistence, and environmental expansion of enterococci within selected niches add considerable complexity to the interpretation of water quality data.

Pseudomonas syringae is a complex group of bacteria which comprises nine different genomospecies and over 50 pathovars Strains of P syringae have been isolated from some rivers and lakes in New Zealand To determine whether these waterways act as reservoirs of plant pathogenic bacteria 15 strains of P syringae isolated from the Waikato River and Whakapapanui stream have been further characterised using several polymerase chain reaction (PCR) protocols Five of those 15 strains belong to genomospecies 1 which comprises P syringae pv syringae but none belongs to genomospecies 2 The protocol for detection of P syringae pv papulans was modified and is now specific for this pathovar The identity of a strain isolated from the Waikato River as being P syringae pv atrofaciens has yet to be confirmed None of the 15 strains studied belongs to the pathovars papulans actinidiae tagetis helianthii or theae

In New Zealand, streamside fencing is a well-recognised restoration technique for pastoral waterways. However, the response of stream ecosystem function to fencing is not well quantified. We measured the response to fencing of eight variables describing ecosystem function and 11 variables describing physical habitat and water quality at 11 paired stream sites (fenced and unfenced) over a 30-year timespan. We hypothesised that (1) fencing would improve the state of stream ecosystem health as described by physical, water quality and functional indicators due to riparian re-establishment and (2) time since fencing would increase the degree of change from impacted to less-impacted as described by physical, water quality and functional indicators. We observed high site-to-site variability in both physical and functional metrics. Stream shade was the only measure that showed a significant difference between treatments with higher levels of shade at fenced than unfenced sites. Cotton tensile-strength loss was the only functional measurement that indicated a response to fencing and increased over time since treatment within fenced sites. Our results suggest that stream restoration by fencing follows a complex pathway, over a space-for-time continuum, illustrating the overarching catchment influence at a reach scale. Small-scale (less than 2% of the upstream catchment area) efforts to fence the riparian zones of streams appear to have little effect on ecosystem function. We suggest that repeated measures of structural and functional indicators of ecosystem health are needed to inform robust assessments of stream restoration.

Dan Watkins was one of the founders of the Ivon Watkins Ltd herbicide company, based in New Plymouth, which later became Ivon Watkins Dow and is now Dow AgroSciences. He was a leading figure in the early weed science research arena within New Zealand. Dan Watkins was a founder of the New Zealand Weeds conference, forerunner of the New Zealand Plant Protection Society. He was also a member of the New Zealand National Research Council and was involved with other scientific bodies. This scholarship has been set up and financed by Dr George Mason, one of the founders of Taranaki Nuchem (now Zelam Limited), in memory of Dan Watkins and to recognise his contribution to weed science within New Zealand. David Kerr, recipient of the 2017/18 Dan Watkins Scholarship in Weed Science, is an MSc student at Canterbury University. His thesis is on the reproduction and ecology of Mimulus guttatus DC, a persistent riparian weed imported from the western United States into New Zealand as an ornamental plant. This weed grows vigorously from the smallest fragments and has potential to cause major damage to river systems; crowding out natives and increasing flooding potential. David’s research aims to investigate how reproductive strategy facilitates the spread of M. guttatus, particularly the role of seed banks in establishing populations after habitat disturbance. Mimulus guttatus produces abundant seeds of very small size (approx. 500 µm in diameter), which have been demonstrated to be viable after travelling hundreds of metres downstream or dispersing in large numbers by wind from dry seed pods. Traditional management techniques involve mechanical clearance or use of herbicides in affected rivers adjoining pasture land. These approaches have notable negative consequences, including waterway contamination and facilitation of fragment dispersal and growth. The first part of David’s thesis involved a survey of 250 contiguous 50-m long stretches of river at six valley locations around Banks Peninsula; recording the presence of M. guttatus and abundance as well as site data such as shading and evidence of grazing on M. guttatus plants. The data from this survey indicated a trend towards greater abundance in more open areas and occasional patches in more shaded regions where the canopy allows sufficient light to grow. Previous work has identified a lack of understanding of transient overwintering seed banks. The second part of David’s thesis will investigate the hypothesis that persistent seed banks allow M. guttatus to establish upstream of populations in shaded areas when the canopy is disturbed. Mimulus guttatus in its native range has high fitness costs associated with selfing. The third will investigate the reproductive strategy of M. guttatus with reference to rates of selfing, and seed viability to test the hypothesis that historic pollinator and mate limitation have driven a change towards selfing. This work will further the understanding of the reproductive strategy of M. guttatus and how it invades river systems and inform land-management and conservation decisions. This has particular relevance to the role of sustainable ecosystem-level approaches to weed management such as native shade belts and conservation of existing forest around waterways to prevent weed establishment.

Aotearoa—New Zealand (NZ) is internationally renowned for picturesque landscapes and agricultural products. Agricultural intensification has been economically beneficial to NZ but has implications for its clean green image. Contaminated waterways, high carbon emissions, and extensive soil erosion demonstrate the downside of high stocking rates and land clearing. Transformative farming systems are required to address the challenge of balancing production with the environment. Whilst navigating through the process of change, farmers need to be supported to make informed decisions at the farm and landscape scale. Landscape ecology (LE) is ideally positioned to inform the development of future farming landscapes and provide a scientific context to the criteria against which land-related information can be evaluated. However, to do this effectively, LE needs to demonstrate that it can link theory with practice. Using NZ as a case example, this paper discusses the key roles for LE in future farming systems. It looks at the way LE can help quantify the state of the landscape, provide support towards the co-creation of alternative futures, and assist with the inclusion of land-related information into design and planning to ensure mitigation and adaption responses assist in the transformation of farming systems for sustainable outcomes.

Waste stabilisation ponds (WSPs) have been used for the treatment of dairy farm wastewater in New Zealand since the 1970s. The conventional two pond WSP systems provide efficient removal of wastewater BOD5 and total suspended solids, but effluent concentrations of other pollutants including nutrients and faecal bacteria are now considered unsuitable for discharge to waterways. Advanced Pond Systems (APS) provide a potential solution. A pilot dairy farm APS consisting of an Anaerobic pond (the first pond of the conventional WSP system) followed by three ponds: a High Rate Pond (HRP), an Algae Settling Pond (ASP) and a Maturation Pond (which all replace the conventional WSP system facultative pond) was evaluated over a two year period. Performance was compared to that of the existing conventional dairy farm WSP system. APS system effluent quality was considerably higher than that of the conventional WSP system with respective median effluent concentrations of BOD5: 34 and 108 g m-3, TSS: 64 and 220 g m-3, NH4-N: 8 and 29 g m-3, DRP: 13 and 17 g m-3, and E. coli: 146 and 16195 MPN/100 ml. APS systems show great promise for upgrading conventional dairy farm WSPs in New Zealand.

The images presented document aspects of progress and growth for a significant wetland and coastal restoration project taking place at Kuku, Horowhenua, southwest coast of North Island, Aotearoa, New Zealand. The work is undertaken by representatives from various hapū known as Ngäti Te Rangitäwhia, Te Mateawa, Ngäti Manu, and Ngäti Kapumanawawhiti ki Kuku, who are affiliates of a larger tribal group, or iwi, Ngäti Tükorehe. The research project (undertaken while working as senior curator Mätauranga Mäori at the Museum of New Zealand Te Papa Tongarewa, Wellington) links cultural landscape issues and activities to the concerns for cultural property as revered taonga with special qualities within museum collections. The term taonga is relevant to understanding culturally venerated items within museum holdings while honoring their associated peoples, tribal lands, and waterways from where they derive. As significant cultural material, taonga are valued because of their associations. Cultural landscapes are also well regarded as land-, sea-, and water-based taonga—an encompassing term that denotes their intrinsic value and intricate natural, cultural, and spiritual interrelationships. As museum professionals rethink cultural property issues in different ways, the academic research has also embraced the concept of land- and water-based taonga to bolster ecological, cultural, and spiritual contexts that persist in ancestral lands in tribal tenure.

The OVERSEER nutrient budget model is a farm-scale nutrient reporting and greenhouse gas (GHG) emission accounting tool used extensively throughout New Zealand (NZ) by farmers, farm consultants and fertiliser representatives. The model is increasingly being used as a tool for implementing regional council resource management requirements to limit nitrogen (N) and phosphorus losses to waterways. NZ’s main dairy company, Fonterra, also requires dairy farmers to have a nutrient budget as part of the national Clean Streams Accord. This means that a high proportion of NZ farmers can obtain reports of their on-farm GHG emission profile. The GHG emission model is based on models and algorithms used for the NZ GHG national inventory, modified to include a wide range of on-farm management practices. The model estimates methane, nitrous oxide and carbon dioxide (CO2) emissions, and presents the results as CO2 equivalents. This paper describes the model and the benefits of combining nutrients budgets and GHG emissions into a single model. It also demonstrates the effects of management practices on a range of outputs, including N leaching and GHG emissions.

This paper examines the history of settler-colonialism and how settler-colonial-led policies and projects to remake the landscapes and waterscapes of Aotearoa New Zealand resulted in the production of Indigenous environmental injustices. Underpinned by theorising on ecological justice and decolonisation, we draw on archival sources and oral histories of Māori and Pākehā (European) individuals living in a single river catchment—the Waipā River—to trace how actions to remove native vegetation, drain wetlands, introduce exotic biota, and re-engineer waterways contributed to intensifying incidence of floods. While Pākehā settlers interpreted environmental transformation as inherently positive, Indigenous Māori perceived it as profoundly negative, a form of ecological dispossession. We demonstrate that while Pākehā narrated floods as disaster events, Māori viewed colonisation as the true disaster, with floods and fires merely products of settlers’ mistreatment of the environment. Moreover, the colonial government’s efforts to control floods resulted in Māori being further alienated from and losing access to their rohe (ancestral lands and waters) and witnessing the destruction of their taonga (treasures including forests, wetlands, and sacred sites). For Māori of the Waipā catchment, flood risk management regimes were far more destructive (socially, economically and spiritually) than flood events.

The question of whether or not we agree with the term Anthropocene becomes inconsequential when examining coastal environments. With few exceptions, anthropogenic encroachment on, and reshaping of, the global coastal zone is evident from space via multiple spectral views. Humans have become one of the dominant agents of coastal system change during the latest part of their relatively short existence, and nowhere is the humanization of coastal landscapes more evident than on islands. Using three island nations characterized by different stages and styles of coastal development – New Zealand, Japan, and Indonesia - we investigate the role of anthropogenic activity in coastal evolution, geomorphology and sediment records. Using field investigations, Geographical Information System (GIS) analyses, and mathematical and conceptual models, we reveals how anthropogenic activity influences processes at multiple time and space scales, with enduring effects. Our first anthropogenic impact investigation focusses on the potential effects of sea level rise (SLR) due to anthropogenic climate change. Using the earthquake-induced land-subsidence experienced in Christchurch, New Zealand, as a relative SLR example (‘Laboratory Christchurch’), evidence shows that coastal settlements are likely to be impacted not only at the shore but further inland via coast- connected waterways, where drainage is impeded due to an increase in the base level of that is the sea. Relative SLR makes it more difficult to evacuate water from subaerial and subsurface hydrosystems, and simulations show that future SLR is also likely to temporarily reduce some rivermouth sediment discharges, creating the potential for accelerated erosion in river-coast interface environments. In addition to flow-on effects from waterways, coastlines themselves have been highly affected by human activity over recent decades to centuries. In Tokyo, the shoreline has undergone artificial progradation, in places by more than 2 km, where concrete has supplanted mudflats, often at elevations above the hinterland of reclaimed areas. In addition to changes in Tokyo’s unconsolidated shores, consolidated coastal cliffs have been modified with the removal of natural talus buffers, again increasing the potential for erosion acceleration. Finally, in our third example, studies of the 2004 Indian Ocean tsunami and the 2011 Tohoku tsunami show that anthropogenic activities and structures play an important role in controlling the erosion and depostion of sediments during extreme events. A chronology of tsunami deposits from the Tohoku coast shows that sedimentary records from tsunami events have become thinner in recent centuries, independent of the incident tsunami wave hydrodynamics, and in relation to increasing levels of coastal plain, shoreline and nearshore development. In light of these multi-scale and multi-process effects, we argue that the Anthropocene is clearly distinguishable from the Holocene in coastal environments due to the significantly stronger signatures of human influence that characterise the former time period.

In Rongoā Māori (traditional Māori healing), the connection with the land stems from seeing Papatūānuku/Mother Earth as a part of our identity/whakapapa (genealogy), our culture, and our wellbeing. This qualitative study aimed to explore the holistic nature and meaning of Rongoā Māori. There were 49 practitioner and patient participants who participated in semi-structured interviews and focus groups across Aotearoa/New Zealand. The findings showed four themes: land as an intrinsic part of identity; land as a site and source of healing; reciprocity of the healing relationship; and the importance of kaitiakitanga/conservation to Rongoā Māori. Participants shared narratives of connections between the people and the land that showed that when the land is well, the people are well. Implications of these themes for Indigenous wellbeing and the conservation and protection of our natural environments led to three recommendations to reconnect with the land, support Rongoā Māori healing, and to participate in the conservation and preservation of local land and waterways. It is hoped that in learning more about the connection between the land and Rongoā Māori healing, we begin to place greater value on the need to conserve and preserve both the land and our connections to her through traditional healing practices.

Glyceria maxima (Reed sweet-grass), an emergent aquatic grass native to Eurasia, has naturalised in North America, New Zealand and southern Australia. Introduced as a ponded pasture species, it threatens native biodiversity and ecosystem processes in freshwater wetlands and waterways. We compared paired sections, either invaded or not invaded by G. maxima, of three upland streams in Gippsland, Victoria, Australia to infer its impacts on macroinvertebrate abundance, morphospecies density, and morphospecies and functional feeding group (FFG) composition. Its potential effects in altering sedimentation were explored by comparing stream channel morphology in paired stream sections at one site. Invasion by G. maxima appears to drive changes in macroinvertebrate morphospecies composition and FFG composition, reducing a diverse array of macroinvertebrates to a more uniform fauna. The estimated volume of plant/sediment matrix in a 50 m invaded stream section was around 1100 m3, nearly 15-fold greater than in an adjacent uninvaded stream section. Glyceria maxima is an autogenic ecosystem engineer, with the ability to convert sections of fast-flowing aerobic streams into partially anaerobic swamps. By generating a root-mat swamp with a high capacity to process nutrients, G. maxima may facilitate its own growth and spread, as well as that of secondary invaders.

Forages and forage mixtures with greater tolerance of dry conditions than perennial ryegrass (Lolium perenne L.) are desirable for dairy farming in New Zealand, and a low urinary nitrogen (N) excretion is desirable to lessen pollution of waterways and ground water, and nitrous oxide emissions. Measurements were undertaken with late-lactation Holstein-Friesian cows (5/treatment) fed tall fescue (Festuca arundinacea Schreb.) with a substantial incursion of weed grasses, as either a sole diet (Grass), or with lucerne (Medicago sativa L.) or lucerne and plantain (Plantago lancelota L.), in metabolism stalls. Approximate ratios (DM basis) of Grass with lucerne (GL) were 55:45, and Grass with lucerne and plantain (GLP) were 55:25:20. Measurements included intakes, production, digestion, rumen function, and urinary excretion, including the circadian patterns of metabolite excretion with a focus on nitrogenous aspects. The DM intakes (kg/day) of cows fed Grass, GL and GLP were 14.9, 12.7 and 15.0 (P = 0.006), and DM digestibility (%) was 58.0, 59.8 and 61.9 (P = 0.006), respectively. Milk yields (kg/day) were Grass, 9.0; GL, 8.7 and GLP, 11.7 (P = 0.003) but composition was not affected by diet. Rumen digesta weight was greatest in cows fed Grass, averaging 23.4% of liveweight after morning feeding. The microbial growth (g/kg organic matter digested) was 16.8 in cows fed Grass and ~24.0 in the other diets. Dietary crude protein concentrations (g/100 g DM) were Grass, 15.4, GL, 20.1 and GLP, 18.3 and urinary N excretion (g/day) was lowest with the Grass diet but urinary N concentration was lowest from cows fed GLP. Daily creatinine excretion was unaffected by diet but there was a 2-fold range in excretion rates within 24 h and values from cows fed fresh forages are lower than published values from cows fed dry diets. Results showed that supplementation of poor quality pasture with lucerne or lucerne with plantain had minor effects on digestibility, and measurements of urinary N suggest a need for caution when predicting urinary N excretion from spot urine sampling in grazing trials.

Weapons in water The purpose of the article is to throw light on Viking Age weapon finds from wetland areas. In the presentation, the author claims that these weapons should be interpreted as traces of ritual acts of deposition rather than as lost items or traces of actual battles. The positions of the weapon deposits in the landscape are discussed. Further, the interpretation of a number of written sources mentioning weapons in connection with wetlands is discussed. An examination of Viking Age weapons found in wetlands in Zealand and Scania shows that they are concentrated in the small rivers of Værebro Å, Tude Å, Lavringe Å, Dybecks Å, Sege Å, and Kävlinge Å; in the Borremosen bog on Møn; in the lakes of Tissø, Näsbyholm Sjö, Søborg Sø, and Højby Sø, and in the wetlands surrounding Kristianstad (Fig. 1).The weapons found in the river Værebro Å (Fig. 2) are discussed. Traditionally, these weapons were interpreted as the remains of a battle that took place in 1133. However, the majority of the weapons are from the 10th century. In addition, both jewellery and tools have been found in the river, and these finds cannot be interpreted as remains of actual battles. The author therefore suggests that the finds from Værebro Å should be interpreted as ritual deposits. In addition, numerous Viking Age weapons have been found in wetlands in Sweden, in the British Isles, and on the Continent. These finds are usually interpreted as the remains of ritual deposits, and the same interpretation is therefore suggested as applying to the Danish and Scanian material.Seen as a whole, the material from Zealand and Scania tends to accumulate near the mouth of small rivers and streams (Fig. 3), and in natural harbours. There is also a tendency towards weapon deposits accumulating near bridges and fords (Fig. 4). It is shown that weapons from the Middle Ages tend to be concentrated in wetlands near castles, and these finds often include a few Viking Age weapons from the time before the building of the castle. Weapon finds from Dybecks Å and Näsbyholm Sjö are examined. The lake of Näsbyholm Sjö contained axes from the 9th to the 12th century (Fig. 5). The river Dybecks Å runs out of the lake, and in it a sword, decorated in the English style, was found near the Herremandsbro bridge, next to which a rune stone called the “Östervemmenhögssten” was raised in memory of “a very noble man”. This type of stone was often raised in commemoration of men that died on Viking expeditions. The sword and the rune stone both date from the late 10th century.The author analyses a number of written sources from the late Viking Age and the early Middle Ages. The poem Vóluspa 21 from the older Edda describes “a stream called Slid, flowing with swords and saxes.” This stream is also mentioned in Grimnesmal 28 from the same Edda, which describes several streams that “run through Midgard, but from here they fall to Hel.” Some of these streams have names that reflect fear, battle, and death in combat. In addition, a new translation of Adam of Bremen’s scolie 138 is suggested: instead of translating the word fons into a “brønd” (well), it should be translated into a “kilde” (spring). If so, Adam of Bremen describes the pagan custom of making sacrifices to springs in Uppsala, which is in keeping with the incidence of weapons from the 9th to the 13th century found in the river Fyris Å, which flows through Uppsala.In some of the rivers there is a long continuity of weapon deposits. This applies to the finds from Tissø, Værebro Å, Søborg Sø, Højby Sø, Näsbyholm Sjö, and from the wetlands surrounding Kristianstad (Figs. 6 & 7). The author suggests that the weapon deposits are connected to overseas expeditions. This interpretation is based on the fact that large quantities of the weapons found are in harbours or river-mouths. In addition, many Viking weapons have been found in areas of the Continent and the British Isles where the Scandinavians stayed for a prolonged period. The importance of the expeditions during the Viking Age is seen in the fact that around one third of the Swedish rune-stones describe men that died on expeditions, and these rune-stones were often placed near large waterways and major roads.The author also suggests that the weapon deposits near bridges and fords could be explained by the importance that these special landscape features had. The fact that bridges had considerable cultural importance is stressed by the large number of rune stones that were erected next to bridges towards the end of the Viking Age. As weapon deposits near bridges occur during the whole of the Viking Age, this may mean that the building of a bridge should not be understood as a Christian act, but as an act of ritual or religious importance that continued from the pagan era into Christian times. In Gylfaginning 48 from Snorre’s Edda, Midgard and Hel are separated by a river, and a bridge leads to the entrance to Hel. The rivers described in Grimnesmal also indicate that some rivers lead to the realm of the dead. There thus seems to be a connection between death and certain waterways. Perhaps this explains why bridge-building became an important Christian act during the late Viking Age and early Middle Ages. The author finally suggests that weapon deposits should be seen as a manifestation of social identity, as deposits in wetlands during the Viking Age follow the same groupings that we know from grave goods such as weapons, jewellery, and tools.Viking Age weapons found in wetlands thus seem to be the remnants of ritual acts, rather than the remains of battles. The finds show that wetlands and waterways were significant features in the Viking Age countryside. Not only were they important means of communication and travel, they were also of fundamental importance to man’s self-concept and philosophy of life.Julie LundInstitut for Arkæologi og EtrologiKøbenhavns UniversitetTranslated by Annette Lerche Trolle

Waterway degradation in agricultural settings is caused by direct and diffuse sources of pollution. Waterway fencing focuses on reducing direct faecal contamination, but the extent to which it reduces overland surface runoff of pathogens is unknown. This study evaluated the potential of four riparian treatments to reduce Giardia in saturation excess surface runoff entering the waterway. Treatment 1 comprised exotic pasture grass and weeds that regenerated from bare soil between the fence and the waterway in the absence of cattle grazing and was compared with three others comprising monocultural plantings of New Zealand native grassland plants. Runoff experiments involving Giardia were performed after planting, both prior to and following the summer growing season. Giardia was not detected from any plot prior to cyst addition. In spring the native ‘C. secta’, ‘A. lessoniana’ and ‘C. richardii’ treatments showed significantly greater reductions in Giardia in runoff than the ‘exotic grasses’ treatment, while in autumn the ‘C. richardii’ treatment reduced Giardia more than the ‘exotic grasses/weeds’. A reduction in public health risk should follow from riparian vegetation, whether exotic or native, but with an added benefit in the case of the native tussock grass C. richardii, due to the associated lower runoff rate.

Phytophthora spp. pose a risk to New Zealand’s managed and natural ecosystems. As Phytophthora spp. are well adapted to aquatic environments, water surveillance can be used to identify their distribution. Seven bait species (Rhododendron arborescens, Pittosporum undulatum, Banksia attenuata, Camellia japonica, Pittosporum eugenioides, Pinus radiata, and Cedrus deodara) were evaluated for Phytophthora spp. isolation. Water was collected from 2 sites in the Suckling river (Tai Tapu) and half was membrane-filtered (3-μm pore size) to capture spores. Leaf baits were floated directly on unfiltered water at room temperature in the laboratory for 7 days. Baits were also placed in nylon-mesh bags and floated in the Suckling river sites (in situ) for 7 days. Leaf lesions and membrane filters were cultured on Phytophthora spp. selective media. Eighty-six Phytophthora spp. isolates representing 5 colony morphotypes were recovered, 6 (3 morphotypes) from membrane filters, 25 (4 morphotypes) from baits on collected river water, and 55 (5 morphotypes) from in situ baits. The highest numbers of isolates were recovered from R. arborescens (50.6%; 4 morphotypes), Pinus radiata (17.2%; 3 morphotypes) and Pittosporum undulatum (12.6%; 2 morphotypes). In situ baiting using Rhododendron arborescens and Pinus radiata was the most effective method of isolating Phytophthora species.

Gevninge – the gateway to LejreGevninge is one of many Danish villages characterised by having extensive modern housing estates built around a medieval core. The oldest part of the village, with a late Romanesque church, lies on the west side of a small river, Lejre Å, about 2 km from its mouth at Roskilde Fjord (fig. 1).Both in the 1880s and in the 1970s, remains of human skeletons were found in Grydehøj to the west of the old village core (fig. 2). These clearly originate from burials, but the finds are undated. In 1974, remains of an inhumation grave from Viking times were found a short distance from a sunken road which, up until the 18th century, was part of the main road between Kalundborg and Roskilde. In 1979, a gilded bronze strap-end mount from the 8th century AD was found less than 200 m south of the sunken road, but it was first in the winter of 1999-2000 that settlement remains from Viking times were discovered.The archaeological investigationsThe excavation in 2000 uncovered 3600 m2 of settlement remains; these had been heavily damaged by site development in the 1960s and 1970s (fig. 3). On the basis of the evidence available, it is impossible to determine whether these represent several phases of a single farmstead or a portion of a larger settlement. The absence of any traces of structures in the northern evaluation trenches indicates that the settlement did not extend to the north of the sunken road where the graves were found. The terrain falls relatively steeply away from the excavation to the east towards Gevninge Bygade and, although it is possible, it seems rather unlikely that the Viking Age settlement extended in this direction. Relative to the topography, an extension to the south and west seems most obvious.There is no doubt that the site should be assigned to the Viking period. House I is unlikely to be earlier than 10th century (fig. 4), whereas the rectangular pit-house belongs to the end of the same century or the subsequent one. House II (fig. 5) and the other pit-houses are – typologically – less useful for a precise dating of the site. The metal artefacts, including the strap-end mount and a handful of coins from the time of the Civil War, span the period from the 8th to the 14th century, but the majority belong in the 9th-10th centuries (figs. 9-13). Pottery is the most common artefact type and occurs as un-ornamented flat-bottomed settlement wares and Baltic ware (fig. 8). The former have typically inwardly curved rim sections, the sides of the vessels are un-ornamented and they are generally bucket-shaped (fig. 14). The Baltic ware pottery is characterised by more angular rims, which have often been finished off using a wooden shaping tool. Decoration is mostly in the form of encircling grooves, waved furrows and a series of slanting or circular impressions. Compared with the other finds from the structures, the Baltic ware from the excavation belongs in the latter part of the 10th century and up into the 11th century.Traces of crafts were not conspicuous. In one pit-house there were several un-fired clay loom weights, while two deep postholes in the bottom of another pit-house are interpreted as the base for a loom. The distaff whorls and – possibly – the few bone and antler needles also belong to textile production (fig. 7). Iron slag, which definitely was not one of the most conspicuous aspects, originates from “fire-based” crafts. Textile production and iron working are the crafts typically seen at agrarian sites, with the former occurring most frequently.On the basis of the buildings, the traces of crafts and the majority of the finds, the site must be categorised as an average farmstead from Viking times. The site did, however, include four unusual finds: a gold armring (figs. 12 and 13), part of a gilded bronze helmet (fig. 10), a bronze bucket and a winged spearhead. These finds give food for thought, nourished by Gevninge’s location in the landscape, combined with its proximity to the legendary Lejre.A main transport junctionThe area south of Gevninge is characterised by a series of branching streams which meet at Gammel Lejre and continue towards Roskilde Fjord in the form of Lejre Å. To the west and southwest there is an area of about 50 km2 with a more-or-less pronounced moraine landscape. Large parts of this have lain through historical times as rough ground, common and forest. This landscape type forms a very clear contrast to the area east of Lejre Å - a flat and fertile plain extending out to the Øresund and Køge Bugt. In landscape terms, this is a border area, running north-south, where crossing points had to be chosen with care. Gammel Lejre, which from the 5th to the 10th century was an important chieftain’s or royal farmstead with magnificent halls, huge long-houses and a cult site, is well-suited to the passage of east-westbound traffic (fig. 15). In the flat terrain to the east of Lejre Å, maps from the end of the 18th century and the beginning of the 19th century show no road network prior to the construction of two highways in the second half of the 18th century. These run in a straight line from Roskilde to Ringsted and Kalundborg, respectively. Between them, Ledreborg Allé can be seen; it was constructed at the same time and probably replaced a road running eastwards from Gammel Lejre. To the west of Lejre Å, the undulating landscape, with its numerous small, steep hills, small lakes, watercourses and wetlands, presented greater challenges. There was an alternative crossing point about 4 km to the northwest, close to the fjord. Today, this place is called Borrevejle, which means “the ford at the edge” (fig. 16). From Borrevejle, the road led to Gevninge and – via the sunken road to the north of the Viking Age settlement – down to Lejre Å. Here lay the ford Langvad, from where the road ran eastwards, south of Lyngbjerg Mose, towards Kattinge. The fact that the roads around 1800 led towards Kattinge is linked with the opportunity here to cross the system of watercourses and lakes which extended from Gammel Lejre and past Kor­nerup to a lake, Store Kattinge Sø, by Roskilde Fjord. At both ends of the lake there were lock bridges to allow passage. Store Kattinge Sø was originally a bay which was dammed in the High Middle Ages so that the water level today lies at +2.5 m. In Viking times the lock bridges at Store Kattinge Sø did not exist, the amount of water on the Kornerup Å drainage system was therefore less, and the possibilities for passage were decidedly different.The road eastwards from the ford in Gevninge could well have gone via Kattinge and crossed the watercourse between Lille Kattinge Sø and the bay. Around 1800, the road continued through Kongemarken, where a Viking Age inhumation grave, a Christian burial ground from the Late Viking and Early Medieval times, as well as remains of a settlement from the same time, have all been found. From here, the road swings northwards, across Gedevad and onwards to the east to the bishop’s thorp, Bistrup, and the village of Bjerget (St. Jørgensbjerg) with St. Clemens’ church on Roskilde Fjord. Neither of these two settlements can, with certainty, be traced back to before AD 1000. It is therefore an obvious possibility that eastward traffic from Kongemarken took a more southerly route, which – perhaps – is indicated by settlement remains and stray finds between Roskilde and Svogerslev Sø (see fig. 16). In this respect, it is worth mentioning that the two stray finds from Viking times from the Borrevejle area lie in association with the old road routes. Similarly, the small hoard of silver rings from Lyngbjerg Mose was found where the road from Gevninge to Kattinge ran from about 1800.From the above, it is apparent that there were two significant possibilities for the passage of east-west land traffic in the Gevninge-Lejre area. Both have topographic advantages and disadvantages, and identification of one as being more important than the other can be based on no more than a guess. However, inclusion of the waterways does contribute a new angle when addressing this question.The sea route to LejreThe Isefjord complex comprises a western and an eastern branch which both extend more than 35 km inland into Zealand. The western arm, Isefjord, is deep and wide and only has narrow passages around Orø (fig. 17). Despite the fact that Isefjord is the most accessible route from a seaward perspective, it is unlikely to have been the route taken by people travelling to Gammel Lejre. The distance over land to the Isefjord is almost three times as great as the shortest route between Gammel Lejre and Roskilde Fjord, and more than half of this distance comprises gently undulating rough ground with numerous ponds and wetlands.Roskilde Fjord is characterised by narrow navigation channels and variable water depth, but these naturally-determined sailing conditions would not have been a problem for people who knew the fjord. The bay, Lejre Vig, is the place closest to Gammel Lejre. The sea route leading to the bay is protected by a natural feature – a transverse bar, which extends from Bognæs in the south to Selsø in the north. The mouth of Lejre Å is, in topographical terms, a well-suited site for a landing place, but there is a lack of archaeological evidence for the existence of such a feature. Given the lack of a demonstrable landing place by the fjord, attention can be focussed on Lejre Å as being Gammel Lejre’s link with the sea.Streams and rivers as travel routesToday, very few watercourses in Denmark appear as being navigable. A very great proportion of them no longer have a natural appearance or water flow. This is primarily due to intensive efforts during the last 200 years to drain wet meadows and fields. Any evaluation of the navigability of a watercourse in Viking times is associated with a number of variable and, in part, unknown factors. Accordingly, any conclusions are vitiated by a degree of uncertainty, not least in the case of smaller watercourses. The width and depth of the stream or river is decisive in determining the size of vessel which can be navigated. The fall and natural course of a watercourse, which in places is sharply meandering with a variable water depth, will be limiting factors relative to the size of the vessel which is able to pass (fig. 18).The appearance of Lejre Å on maps from the 19th century can give some indication of the conditions prior to the time when drainage and water extraction were initiated. It seems that the course of the stream was relatively straight from its mouth up to Gevninge. However, at Gevninge Church there was a very sharp turn and this is still in existence. To the south of the village, the stream is considerably narrower and substantially more winding. Particularly from Kornerup and southwards towards Gammel Lejre, the course is, in places, strongly meandering. Overall, the stream has a fall from Gammel Lejre to its mouth of 7 m, which corresponds to a gradient of 1‰. The fall is not, however, evenly distributed. From Gammel Lejre, and about 1.5 km down its course, the stream falls 2.79‰, whereas the fall over the next 750 m is 1.31‰. From here to the ford in Gevninge, the fall is 0.5‰, with the last section to the mouth of the river having a fall of 0.34‰. Ole Crumlin-Pedersen has suggested that a watercourse is navigable – all things being equal – as long as the fall is less than 2‰. Alone on this basis, it is unlikely in the past that vessels sailed all the way to Gammel Lejre. It is therefore an obvious possibility that Gevninge was the place where the change was made from waterway to roadway.The distance from Gevninge to Gammel Lejre is 3.7 km by road, as shown on maps from around 1800. The road departs from an area where Viking Age settlement has been excavated and it follows the contours of the landscape in such a way that steep passages are avoided. The route taken by this road, rather than the river, constitutes the probable link between the two places.ConclusionGammel Lejre was not established at some random place in the landscape. With regard to resources, it was a border area between the hamlets of the Eastern Zealand plain and the Central Zealand forest settlements. In addition, it provided a satisfactory, potential crossing point east-west over the steam systems from the south. There is archaeological, legendary and historical evidence showing that Gammel Lejre was a very special place in the Late Iron Age and Viking times. This special position arose from its role as a cultic and power-political centre.The same situation was probably the case at the Tissø complex in Western Zealand, which was established at the beginning of the Late Germanic Iron Age. Tissø lies slightly more than 6 km from the coast, and both its name and finds from the lake demonstrate the cultic significance of the site. Almuth Schülke has pointed out that the Tissø complex lies virtually on an island, with the lake to one side and wetlands and watercourses to the other. Access to Tissø was made difficult by natural barriers in the landscape which conferred exclusiveness and – not least – the possibility of controlling traffic to the settlement.The topographically determined limitations on potential access to Gammel Lejre are not as clear as in the case of the Tissø complex. Watercourses and wetlands to the south and east form a natural border, and the rough ground of the common landscape to the west contains its own obstacles. None of these barriers was insurmountable but they could well have functioned as a border zone around Gammel Lejre. In the area of common from Borrevejle in the north to Ledreborg Castle in the south, a couple of settlements have been demonstrated along with three graves and a few stray finds from the Roman Iron Age. Similarly, in the Middle Ages there were at least five thorps here, which were later abandoned. For the central period relative to Gammel Lejre, the 5th-10th centuries AD, there are no finds from this area. It was not necessarily a conscious choice that the area lay abandoned. The same tendency to abandon poorer soils at the beginning of the Late Iron Age can be seen elsewhere, such as, for example, in Nordskoven at Jægerspris and on Halsnæs at the northernmost part of Roskilde Fjord. Neither is it unusual that areas such as these were then re-occupied for thorp settlement in the Early Middle Ages. This does not, however, change the fact that the area to the west of Gammel Lejre appears to have lain as a wilderness in Viking times. Apart from one artefact with no details of its exact find spot, there are no recorded finds from the Late Iron Age bet­ween the central site and Elverdamsåen, a watercourse lying about 10 km to the west.Access to Gammel Lejre was obviously regulated so that approved people could enter and intruders were held at a distance. Gevninge was a link in this invisible fence. Gevninge is located where roads running east-west meet to avoid Central Zealand’s areas of hilly rough ground, and where watercourses could be crossed relatively unproblematically. Furthermore, Gevninge was a landing place and offloading point for vessels that were able to enter the lower part of Lejre Å. Larger vessels could perhaps have lain at the mouth of the stream or innermost in Lejre Vig, but from here people would anyway have been directed to follow the road from Gevninge to Gammel Lejre.Seen in the light of this situation, Gevninge could have been the home of the Lejre King’s entrusted servant. He not only controlled the traffic through the area and access to Gammel Lejre, he also represented the Lejre king and, on his behalf, received distinguished personages and – who knows – perhaps escorted them to important meetings in the exclusivity of the magnificent hall. With this position in society, Lejre’s gatekeeper probably received gifts of golden rings, magnificent weapons and vessels from Lejre’s pugnacious king.Jens UlriksenRoskilde Museum

Urban waterways represent less than 1% of the total river length in New Zealand. However, they are the most visible of all rivers, as 86% of New Zealanders live in urban areas. Urban waterways are impaired due to elevated levels of pathogens, turbidity, nutrients and heavy metals originating from anthropogenic activities. In addition to being conduits of storm water run-off from urban areas, some urban waterways also receive discharges from wastewater treatment plants and combined sewage overflows, thus greatly reducing their capacity to provide ecosystem services such as recreation, tourism, biodiversity and mahinga kai. This article summarises the state of New Zealand’s urban freshwater quality, the major drivers of pollution, and mitigation measures needed to restore urban waterways.

Waterways in the Southern Hemisphere, including on the Australian continent, are facing increasing levels of mercury contamination due to industrialization, agricultural intensification, energy production, urbanization, and mining. Mercury contamination undermines the use of waterways as a source of potable water and also has a deleterious effect on aquatic organisms. When developing management strategies to reduce mercury levels in waterways, it is crucial to set appropriate targets for the mitigation of these contaminated waterways. These mitigation targets could be (1) trigger values or default guideline values provided by water and sediment quality guidelines or (2) background (pre-industrialization) levels of mercury in waterways or sediments. The aims of this study were to (1) quantify the differences between existing environmental guideline values for mercury in freshwater lakes and background mercury concentrations and (2) determine the key factors affecting the spatial differences in background mercury concentrations in freshwater lake systems in Australia. Mercury concentrations were measured in background sediments from 21 lakes in Australia. These data indicate that background mercury concentrations in lake sediments can vary significantly across the continent and are up to nine times lower than current sediment quality guidelines in Australia and New Zealand. This indicates that if waterway managers are aiming to restore systems to ‘pre-industrialization’ mercury levels, it is highly important to quantify the site-specific background mercury concentration. Organic matter and precipitation were the main factors correlating with background mercury concentrations in lake sediments. We also found that the geology of the lake catchment correlates to the background mercury concentration of lake sediments. The highest mercury background concentrations were found in lakes in igneous mafic intrusive regions and the lowest in areas underlain by regolith. Taking into account these findings, we provide a preliminary map of predicted background mercury sediment concentrations across Australia that could be used by waterway managers for determining management targets.

Draft genomes of seven extended-spectrum β-lactamase (ESBL)-producing Escherichia coli strains recovered from New Zealand waterways are described. The mean genome size was 5.1 Mb, with 4,724 coding sequences. All genomes contained the ESBL gene bla CTX-M , and one carried a plasmid-mediated AmpC gene, bla CMY-2 . A multidrug-resistant genotype was detected in three isolates.

Reactive phosphate rock (RPR) has been studied extensively in field trials and laboratory research in New Zealand since the 1930s. This paper looks at the different approaches to research over the decades, at what conclusions were drawn, at the recommendations made to farmers, and at the commercial promotion and sales of RPR. It is not an exhaustive literature review, but sufficiently comprehensive to demonstrate the large amount of research conducted, and to document the important issues that have arisen, particularly with respect to advice being given to farmers. RPR research has suffered from a series of mishaps which have hindered, in one way or another, the results being accurately interpreted and passed on clearly to farmers. There is a need for specific advice for farmers regarding managing or minimising any lag in production following a switch to RPR. New Zealand's grazed pastures, water quality and "clean and green" image internationally are closely interlinked. Given the proven significant reduction in P losses in run-off to waterways with RPR, the conditions in which RPR can be successfully used in New Zealand's pastoral agriculture have been reassessed. Key words: reactive phosphate rock, RPR, superphosphate, SSP, TSP, PAPR, long-term comparisons, plot trials, grazing trials, fertiliser recommendations, history

ABSTRACT Campylobacter jejuni, a leading cause of gastroenteritis worldwide, has been frequently isolated from recreational rivers and streams in New Zealand, yet the public health significance of this is unknown. This study uses molecular tools to improve our understanding of the epidemiology and sources of Campylobacter in recreational waterways, with a view to preventing human infection. Epidemiological and microbiological data were collected between 2005 and 2009 from six high-use recreational waterways in the Manawatu-Wanganui region of the North Island. Campylobacter spp. and C. jejuni were isolated from 33.2% and 20.4% of 509 samples, respectively. Isolation of Campylobacter was observed in both low and high river flows. After adjusting for the confounding effects of river flow, there was a significantly higher likelihood of isolating Campylobacter in the winter month of June compared to January. A high diversity of C. jejuni multilocus sequence types was seen, with the most commonly isolated being the water rail-associated ST-2381 (19/91 isolates [20.9%]), ST-1225 (8/91 isolates [8.8%]), and ST-45 (6/91 isolates [6.6%]). The ST-2381 was found in all rivers, while the most commonly isolated ST from human cases in New Zealand, the poultry-associated strain ST-474, was isolated only in one river. Although the majority of Campylobacter sequence types identified in river water were strains associated with wild birds that are rarely associated with human disease, poultry and ruminant-associated Campylobacter strains that are found in human infection were also identified and could present a public health risk. IMPORTANCE In 2016, there was a large-scale waterborne outbreak of campylobacteriosis in New Zealand, which was estimated to have affected over 5,000 people. This highlighted the need for a greater understanding of the sources of contamination of both surface and groundwater and risks associated with exposure to both drinking and recreational water. This study reports the prevalence and population structure of Campylobacter jejuni in six recreational waters of the Manawatu-Wanganui region of New Zealand and models the relationship between Campylobacter spp. and ruminant-associated Campylobacter and the parameters “sites,” “months,” and “river flow.” Here, we demonstrate that both low and high river flows, month of the year, and recreational sites could influence the Campylobacter isolation from recreational waters. The presence of genotypes associated with human infection allowed us to describe potential risks associated with recreational waters.

This article explores deep underlying assumptions about relationships between people and the planet, and how these translate into very different ways of relating to waterways in Aotearoa New Zealand. In te ao Mäori – ancestral Mäori ways of living – rivers and lakes are the tears of Ranginui, the sky father, mourning his separation from Papatüänuku, the earth mother, and people are their descendants, joined in complex whakapapa that link all forms of life together. In modern ways of thinking, on the other hand, ideas such as private property, resource management and ecosystem services can be traced back to the Genesis story of God’s gift of ‘dominion’ to Adam and Eve over fish, birds, plants and the earth itself, including waterways, in which all other life forms are created for human purposes. In successive Waitangi Tribunal claims, iwi have disputed these assumptions in relation to fisheries, tribal lands and rivers, and, in worldleading legislation, the Whanganui River has been declared a legal person with its own rights. In this article, the authors discuss different ways in which the rights of rivers as rivers might be understood in scientific terms, investigating the ‘geomorphic rights’ of the Whanganui River, for instance, and how rivers as living communities of land, water, plants, animals and people might be understood through ‘river ethnography’, an approach that aligns a wide range of natural and social sciences with mätauranga taiao – ancestral knowledge of other living systems. They also consider how current policy discussions might be informed by such framings, so that river communities across Aotearoa New Zealand may be restored to a state of ora – life, health, abundance and prosperity.

This paper outlines findings for three experiments on the AgResearch Invermay deer farm that quantified soil and water quality via fence-line pacing and wallowing, and water quality in streams draining the farm. Five weeks after winter grazing (28 hinds/ha), fence-line pacing decreased soil macroporosity and saturated hydraulic conductivity, and increased suspended sediment (SS; 0.226 g/100ml), total phosphorus (P) (TP; 2.0 mg/l), mainly as particulate P (up to 90% of TP), and E. coli (3.52 log10 cfu/100ml) concentrations in a simulated overland flow 1 day after grazing had stopped compared to soils from the rest of the paddock (0.148 g/100ml, 0.86 mg/l and 2.86 log10/100ml). Six weeks following a first simulated rainfall event, and without interim grazing, concentrations in the second simulated event had decreased but losses of P, especially in fence-line paced soils, were still high and above recommended limits for surface water quality (TP = 0.033 mg/l). A survey of visible erosion in 6 deer paddocks with topography (2- 10o) yielded a mean erosion rate of 1.08 t/ha/yr (range, 0.41-2.01 t/ha/yr), 43% associated with fence-lines, troughs or gateways and 57% associated with wallows. Data from three waterways indicated that mean values for two sites that drain 100% deer farmed land, exceeded current lowland surface water limits for dissolved (0.01 mg/l) and TP (0.033 mg/l) and ammoniacal-nitrogen (N) (0.021 mg N/l). Limits for E. coli (126 E. coli/100ml) and nitrate-N (0.444 mg N/l) were also exceeded at another site, which drained a wallow. All guideline values were exceeded during storm flow when ephemeral streams, commonly draining wallows, were flowing to permanent waterways. However, loads of P, N and SS were below average for mixed-grazing pasture catchments in New Zealand. This was attributed to a dry year (rainfall