Artykuły w czasopismach na temat „Fitzroy River estuary (Queensland)”

Environmental Context. The Fitzroy River Basin constitutes a major source of suspended sediment and nutrient fluxes to the southern Great Barrier Reef. Improved land management practices to ameliorate these catchment loads require an understanding of the sediment sources and dynamics. This multidisciplinary geochemical and modelling study provides for the first time a quantitative estimate of sediment sources delivered to, and their degree of retention in, the Fitzroy River Estuary. Abstract. Sources of sediment deposited in the Fitzroy River Estuary (FRE) have been identified and quantified using an integrated geochemical, modelling and reconnaissance soil sampling approach. A companion paper (this volume) identifies the major sources of sediments in impoundments on the major river systems and sediment sampled from flood events in the Fitzroy River Basin (FRB). Sediment within the FRE may display distinct longitudinal variation with little basaltic material retained. Sediments derived from the Bowen Basin, which occupies the greatest portion of the FRB, and from the Surat Basin display the greatest longitudinal variation. All FRB soils have a similar total phosphorus (P) concentration. Thus, in considering P export from the catchment it is the total sediment flux which is of major importance, rather than the relative proportions of individual catchment soils. This research provides crucial new regional scale information on the sediment sources deposited within the FRE.

Environmental Context. The Fitzroy River Basin is a major contributor to the loads of suspended sediment and nutrients reaching coastal areas in the southern Great Barrier Reef. Cost-effective investment in improved land, vegetation, and water management to lower these loads requires an understanding of the sources and movement of sediments within the basin. This multidisciplinary geochemical and modelling study provides for the first time a quantitative estimate of sediment sources and spatial and hydrology-related variation within the Fitzroy River Basin. Abstract. An integrated geochemical, modelling, and reconnaissance soil sampling approach has been used to identify the sources of sediment in the Fitzroy River Basin (FRB). The composition of sediment in weirs and dams within the FRB indicate that in the southern and central FRB the Dawson River contributes only a small basaltic component and the inputs are dominated by soils from the Surat and Bowen Basins. Rivers from the central FRB carry variable amounts of basaltic soils. In contrast, basaltic soils constitute the majority of sediment transported during flood events. Surat Basin soils form a minor component of flood events with little contribution from soils of the Bowen Basin despite it constituting the majority of the area of the central FRB. Soils from the Thomson Fold Belt constitute a substantial proportion of the sediment transported by, and retained in, impoundments in the central FRB and also dominate sediment delivered from the western FRB. This study will inform cost-effective investment by government to target remedial actions to reduce sediment and nutrient loads within the FRB that may be ultimately transported via the Fitzroy River Estuary to the southern Great Barrier Reef.

Environmental context. The Fitzroy River Basin is a major source of suspended sediment and nutrients to the southern Great Barrier Reef lagoon. A reduction in sediment and nutrient loads is necessary to protect coastal reefs and this requires an understanding of the sediment sources. The present geochemical and modelling study provides a quantitative estimate of the spatial and temporal variations in the sources of sediment deposited in the Fitzroy River coastal zone. Abstract. Sediment sources to the Fitzroy River coastal zone have been identified and quantified using an integrated geochemical and modelling approach. The coastal sediments display little geochemical variation as a result of substantial homogenisation during hydrodynamic processes and indicate a sediment composition consistent with derivation from mixed catchment sources. A lack of substantial temporal geochemical variation in the sediment records indicates weathering regimes and hydrodynamic transport have been relatively consistent throughout the Holocene. Despite this apparent geochemical homogeneity, a modelling approach using a Bayesian statistical model revealed changes in catchment sediment sources over time. Variations in the occurrence and intensity of rainfall events in different parts of the catchment as well as land-use changes following European settlement are likely to have had a substantial effect on the relative contributions of the catchment sources delivered to and deposited in the coastal zone. Additionally, large variations in flow events and variable estuary hydrodynamics result in different catchment soil types being delivered and deposited under different conditions. The present study found that basaltic material is the dominant catchment source in the coastal surface sediments with an estimated enrichment of ~3 relative to catchment and estuary abundances. Basaltic soils present as a more recent and extensive, weathered surficial cover are more readily mobilised than other catchment soils and will be transported further within freshwater flood plumes. It is likely that in large flood events, this basaltic material may reach the coral-dominated outer shelf. Improved land management practices to reduce sediment loads can be targeted to the areas supplying the majority of sediment to the coastal zone.

Some human-altered habitats such as saltfields support significant numbers of shorebirds and waterbirds, but their values in tropical eastern Australia are poorly understood. With the continuing loss of shorebird habitats in the East Asian-Australasian Flyway, identification of important habitats and management is important for their conservation. The habitat value of two saltfields associated with the Fitzroy River estuary, Queensland (23.520S, 150.860E) was evaluated by monthly surveys over 33 months and by comparison to previous surveys of nearby natural wetlands. Saltfields supported as many waterbirds and species as freshwater and naturally saline lagoons. Numbers of migratory shorebirds peaked during the southern migration period (September to November), when wetlands in tropical northern Australia are at their lowest extent, thus elevating the conservation value of tropical saltfields to shorebirds. Sharp-tailed Sandpipers were regularly present in numbers exceeding international levels for staging, while Red-necked Stints were just below the staging criterion. Salinity regime was found to influence waterbird communities associated with saltfield pools: piscivores dominating metasaline pools, and shorebirds hypersaline pools. A seasonal pattern of occurrence occurred in some guilds with greatest numbers in the drier months (cormorants, pelicans, ducks and egrets, all significantly negatively correlated with the previous month’s rainfall), most of which bred in nearby natural wetlands during the wet season. Furthermore, cormorants were abundant in the saltfields and fluctuated less compared with natural lagoons during the critical drier months. Overall, saltfields are an integral component of the ecology of the landscape, providing complementary resources to that of the natural wetlands.

Environmental context. During flood events, the Fitzroy River is a major contributor to the loads of suspended sediment and nutrients to the southern Great Barrier Reef. The present geochemical and modelling study provides for the first time a quantitative estimate of the temporal variation in sediment sources over an entire flood hydrograph. Basaltic soils are substantially enriched in this flood event relative to their catchment abundance. Abstract. Suspended sediment collected over a complete flood hydrograph in the Fitzroy River provided an insight into the origin and transport of sediment in this system. Strong temporal trends are evident in the proportions of catchment soil types estimated using a Bayesian mixing model in the fine (<10 μm) fraction of the suspended sediment. These temporal trends were also manifested in changes in mineralogy, major and trace element and Nd–Sr and C–N isotope geochemistry. Tertiary Basaltic soils were the most abundant catchment soil type transported in the flood event studied here, constituting 39% of the <10-μm sediment fraction, but varied between an estimated 20 and 50% of the suspended solids over the course of the flood event. The techniques used here allow quantification and comparison between flow and suspended sediment sources and are widely applicable to other river systems.

Understanding spatial patterns in demographic parameters of exploited fish species is of critical importance to effective fisheries management. In the present study, patterns in demography of a large, protandrous, estuarine teleost, king threadfin, Polydactylus macrochir, were compared among three estuaries on the eastern coast of Queensland, Australia. Significant variation in age and growth was observed between fish from the Fitzroy River and those from the Mary and Brisbane Rivers, with Fitzroy River fish living longer (22 years v. 10 and 14 years, respectively), reaching a greater asymptotic length (1222-mm fork length (FL) v. 975- and 1047-mm FL, respectively), and attaining greater length-at-ages of 6 years and beyond. No difference in growth was detected between Mary and Brisbane River fish, or in total mortality among any of the sites. Fitzroy River fish were generally found to mature and change sex at greater lengths and ages than those from the Mary and Brisbane Rivers. The observed variability suggests that spatially segregated populations of P. macrochir may respond differently to fishing pressure and highlights the importance of understanding the spatial patterns in demography of exploited estuarine fish populations.

The Burnett River snapping turtle (Elseya sp.) from the Burnett, Mary and Fitzroy river systems is an undescribed Australian freshwater turtle, of which very little ecological information is known. This paper describes the dietary ecology of the species in the Burnett River catchment. Stomach and faecal samples were collected from turtles and an index of relative importance was used to rank food items found in stomach samples. This index indicated that algae and aquatic ribbon weed (Vallisneria) were the dominant food items consumed. No difference in diet was found between males and females. Although the sample size was small, diet appeared to vary slightly seasonally, with Elseya sp. selectively feeding on the flower buds of the Chinese elm tree (Celtis chinensis) and the seeds of the blackbean tree (Castanospermum australe) when these food items were seasonally available. Faecal samples suggest that the most ingested foods (algae and aquatic ribbon weed) were also the most digestible. Although predominantly herbivorous, Elseya sp. was seen to eat carrion once in the wild.

Aspects of the morphometry and physical and chemical limnology of Yeppen Yeppen Lagoon, in tropical Australia, have been investigated. The lagoon is a channel billabong lying in the old bed of the Fitzroy River. It has a relatively small, shallow and elongated basin. Seasonal variations in water temperature, light regime, oxygen concentration, pH and conductivity suggest that the lagoon exhibits a warm monomictic pattern of thermal stratification rather than a continuous warm polymictic one. The annual heat budget was 3294 calories cm-2 year-1. Maximum work of the wind was 238.8 g-cm cm-2, and maximum stability was 34.5 g-cm cm-2. Despite the apparently low stability of stratification, the lagoon remained thermally stratified for much of the year. Analysis of wind-distributed heat suggested that slow mixing was taking place even during periods of relatively high stability, although this mixing was insufficient to reoxygenate the hypolimnion, which remained anoxic for much of the year. Yeppen Yeppen Lagoon is likely to prove eutrophic, and it is suggested that primary productivity will be high because a large volume of the lagoon's water is well lit and a large sediment surface area is in contact with the epilimnion. Notes on the biota of Yeppen Yeppen Lagoon are also given.

A laboratory-based study of the behaviour of phosphorus (P) was carried out on the soils of the lower Herbert River catchment, Queensland, Australia. The aim was to explore the potential for P sorption or desorption by Herbert soils in associated river and estuary waters, so that the extent of problems associated with sugarcane production and soil-derived inputs to streamwater could be defined. Anion exchange resin was used as a sink for P. The equilibrium phosphate concentration (EPC) measured in simulated soil pore water (0.01M CaCl2), and the EPC in the simulated river and estuary waters were strongly correlated. Based on this, and the close relationship between P sorption and selected soil properties, it was possible to estimate P desorption using commonly measured properties. Much less desorption of P took place in simulated estuary waters than in simulated river water of much lower ionic strength. This suggests that environmental degradation arising from the downstream export of soil-borne P from Herbert cane lands is likely to be concentrated in freshwater areas. Sorption properties of P in soils of the lower Herbert appear to be closely associated with aluminium-rich minerals, rather than with iron (hydr)oxides.

In tropical Australia, intensive studies of river suspended sediment (SS) and nutrient dynamics have been restricted to streams on the north-east coast between the Fitzroy and Normanby Rivers (Queensland), Magela Creek/East Alligator River (Northern Territory) and the Ord River (Western Australia). Historical conditions in these rivers were probably characterised by low–moderate SS concentrations and low concentrations of dissolved inorganic nitrogen and phosphorus in flow events. Introduction of agriculture has transformed SS and nutrient dynamics. Grazing has led to soil erosion and increased SS and particulate nutrient concentrations and fluxes in event flows. Fertilised cropping has increased nutrient inputs to catchments, where it forms a substantial proportion of the catchment area. Consequently, both particulate and dissolved inorganic nutrient concentrations and fluxes have increased. Australian tropical rivers have episodic flows, with most material transport occurring during large flow events. The restricted period of these highly energetic flows means little trapping of materials in waterways occurs. Loads are transported efficiently downstream and processes such as denitrification and in-channel sedimentation may be of limited importance. Owing to excessive nutrient inputs associated with agriculture, a number of northern freshwater, estuarine and coastal ecosystems are now eutrophic. Continued development, especially fertilised cropping, without adequate management of nutrient losses is likely to exacerbate these problems.

The dynamic interplay between physical, chemical and biological factors in the development and persistence of cyanobacterial blooms in impounded rivers is an important topic. Over a 3-year study period, variable climatic conditions were recorded in the Fitzroy River, Queensland, Australia, which is a typical, impounded lowland tropical river. Post-flood turbidity reduced the available light in the well-mixed water column to levels insufficient for cyanobacterial growth. Only when the water column stratified and the slowly sinking particles dropped from the surface layer did the ratio of surface mixed layer depth to euphotic depth approach 1, allowing cyanobacterial growth. By the time the light climate became favorable, most of the dissolved nutrients had been scavenged from the water column by settling particles or sequestered by fringing macrophytes and other biogeochemical processes. Cyanobacterial blooms dominated by Cylindrospermopsis raciborskii persisted for several months until the next flood flushed the system. The cyanobacterial species dominating that environment were very small and had high specific phosphorus uptake rates. Their nutrient requirement was met by transfer across the oxycline driven by regular high wind mixing events, entraining nutrient-rich bottom waters. Nutrient fluxes from the sediments into the anoxic bottom layer were sufficient to replace the bottom nutrients lost to the surface layer.

Above- and below-ground biomass of five species of mangroves was estimated for the Mary River, south-eastern Queensland. Below-ground : above-ground biomass ratios of species in the upstream reaches (Avicennia marina, Aegiceras corniculatum and Excoecaria agallocha) averaged <0.5, and those of species in the saline conditions of the mouth (Avicennia marina, Rhizophora stylosa) ranged between 0.9 and 1.5. Within the estuary mouth, above-ground biomass of Avicennia marina and Ceriops tagal decreased between frontal saline and upper-intertidal hypersaline environments, and this was reflected in the below-ground : above-ground biomass ratios, which increased to approximately 3.5 for both species.

The use of spatially distributed erosion and sediment yield models has become a common method to assess the impacts of land-use changes within catchments and determine appropriate management options. Lack of model validation is, however, increasingly recognised as an issue, especially for models applied at the large-catchment or regional scale. The present study applies the spatially distributed erosion and sediment yield model SedNet to a 6000-km2 subcatchment of the Fitzroy River in central Queensland, Australia. Model outputs are compared with the results from sediment-source tracing, measured floodplain deposition rates and available hydrometric station data. Results indicated that significant improvement can be made to model predictions when catchment-specific observations (such as river bank and gully geometry and gully erosion history) are used to refine model-input parameters. It was also shown that the use of generic input parameters used by previous SedNet applications within the Great Barrier Reef catchment area resulted in overestimates of sediment yields. Previous model applications may have overestimated the significance of post-European catchment disturbance on the sediment yields of the dry-tropical catchments draining to the Great Barrier Reef. Our findings illustrated the value of obtaining empirically derived data to validate spatially distributed models applied at large scales.

The physical, chemical and biotic conditions before and during a bloom of predominantly coiled heterocystous C. raciborskii are described. Initial increases in the population of this species were associated with windy days and the first downward movement of the thermocline into an anoxic hypolimnion after an extended period of stable stratification and no flow. Exponential growth and bloom formation coincided with the amval and retention of first wet-season inflows into the river impoundment. Cyanobacteria and rotifers dominated the planktonic assemblage and chytrids (cyanobacterial pathogens) were present when the cell density of cyanobacteria peaked. Grazing of the coiled forms that dominated during the bloom was not recorded, but the rotifer Brachionus angularis has been observed ingesting entire straight trichomes of C. raciborskii.

The hydrological conditions and fish fauna occurring in canal developments situated near the mouth of a subtropical estuary in southern Queensland were studied for 15 months from December 1985 to February 1987. In contrast to canal developments situated in bays or the middle reaches of estuaries, these downstream canals did not entrap sediments, and only minimal silt deposition occurred in those canals most isolated from the river. Hydrological conditions within the canals were generally within recommended limits for fish survival, although low oxygen concentrations in bottom water occurred on isolated occasions in the dead-end canals. The ichthyofauna of these canals, as in other canal developments, was dominated by planktivores/microcarnivores of no direct importance to fisheries. These fish guilds occurred in substantially greater numerical proportions in the canals than in undisturbed wetland areas. Well-flushed canals constructed in nontidal sandy areas are likely to have minimal impact on existing fish communities and could increase the area of available fish habitat. Extra keywords: canal design, hydrology, oxygen content, estuarine fisheries, coastal development.

Establishing drivers of fish abundance in estuaries is an important task of both theoretical and practical significance. Commercial catch data help explain large-scale variation in fish productivity; however, there is insufficient understanding of small-scale changes. We analysed correlations between acoustically estimated fish biomass (FB) and environmental variables, which included indices of primary productivity and physio-chemistry in a coastal river system during four seasons. Spatial series of FB were obtained for the Logan River (main estuary) and the Albert River (tributary) located in South East Queensland, Australia. Most of the year, FB was significantly higher in the Albert River. Annual means for discharge, salinity and pH were significantly lower, whereas phosphorus concentrations were higher in the Albert River. Out of 15 hydrological variables tested, FB was strongly correlated only with salinity, conductivity and turbidity. In the Albert River, where fish were larger, as indicated by greater target strengths, FB was positively correlated with river discharge. Our results suggest that salinity and turbidity can be important seasonal drivers of fish abundance in communities dominated by Mugil spp. and Nematalosa erebi and that the flow-biomass relationship may appear independent of the effects of primary production.

The area of seagrasses in waters adjacent to the Queensland coast between Cape York and Hervey Bay is approximately 4000 km2. Seagrasses were found near estuaries, in coastal bays and associated with islands, at sites that provided shelter from the south-easterly trade winds and Pacific Ocean swells. Of the seagrass meadows mapped, 37% had a bottom vegetation cover greater than 50%. Two large continuous areas (total of approximately 2500 km2) of seagrass of predominantly Halophila species were found in deep water in Hervey Bay and between Barrow Point and Lookout Point and may be part of a much larger area of deep-water seagrass habitat not yet surveyed in the Great Barrier Reef province. Fourteen seagrass species were found in the surveyed region, and most were typical of the northern Australian and Indo-West Pacific region. The opportunistic Halophila and Halodule species were most common, with Halophila ovalis (R. Br.) Hook. f. and Halodule uninervis (Forsk.) Aschers. each being found in more than 15% of samples. High species richness occurred at depths of less than 6 m, predominantly in sheltered bays at coastal and island locations. Low species richness at estuary- associated sites may be due to stresses caused by low salinity during monsoonal runoff periods or exposure at low tides. Zostera capricorni Aschers. was restricted to these areas and may have a competitive advantage over other species with lesser tolerance to varying salinity. Species richness decreased with an increase in both latitude and depth. The latitudinal limits of recorded distributions for some of these tropical seagrasses were confirmed. Seagrass biomass decreased with increasing depth, but parameters of seagrass abundance showed no correlation with latitude, being dependent on a complex of site-related factors. High seagrass biomass occurred at sheltered sites, including estuary-associated, coastal-bay and island-associated sites. The maximum recorded above-ground biomass was 102.9 g m-2 for Zostera capricorni at Upstart Bay. Shoot densities reached 13 806 shoots m-2 for Halophila ovalis at Escape River, and the highest leaf area index was 1.81 for Zostera capricorni at Upstart Bay.

In all, 23 sediment samples and 8 water column samples from the Brisbane River estuary, Queensland, Australia, were analysed for polycyclic aromatic hydrocarbons (PAHs) in order to assess the field partitioning behaviour of these hydrocarbons. Twelve PAHs, ranging in molecular weight from naphthalene to benzo[a]pyrene, were identified and quantified. Their partition coefficients, indexed to sediment organic carbon and lipid content, were calculated after filtering to remove particulates and making a calculated adjustment for colloids, or organic matter, in the water phase. In logarithmic form, the partition coefficients were related to the physico-chemical properties of the compounds (Kow, Sw, RRT) by relationships having a parabolic shape rather than being linear. However, compounds with log Kow values of less than 5.5 gave linear relationships comparable to, but distinctly different from, those obtained from laboratory experiments. It is suggested that field conditions have distinctive differences from laboratory experiments that do not allow the direct translation of laboratory-based relationships to the natural aquatic environment.

This study measured forage biomass production, diet quality, cattle liveweight gain, and economic performance of six forage types at 21 sites across 12 commercial beef cattle properties in the Fitzroy River catchment of Queensland during 2011–2014 (28 annual datasets in total). The forages were annual forage crops (oats (Avena sativa), sorghum (Sorghum spp.) and lablab (Lablab purpureus)), sown perennial legume-grass pastures (leucaena-grass (Leucaena leucocephala spp. glabrata + perennial, tropical grass (C4) species) and butterfly pea-grass (Clitoria ternatea + perennial, C4, grass species)), and perennial, C4, grass pastures. The sown forages resulted in 1.2–2.6 times the annual cattle liveweight gain per ha than perennial grass pastures. Annual cattle liveweight gain per ha, forage establishment and management costs, and cattle price margin (sale price less purchase price, $/kg liveweight) all influenced gross margin, however, none was an overriding factor. The average gross margins ($/ha.annum) calculated using contractor rates, ranked from highest to lowest, were: leucaena-grass pastures, 181; butterfly pea-grass pastures, 140; oats, 102; perennial grass, 96; sorghum, 24; and lablab, 18. It was concluded that the tendency towards greater average gross margins for perennial legume-grass pastures than for annual forage crops or perennial grass pastures was the result of the combined effects of lower average forage costs and high cattle productivity.

Changes in plant and macroinvertebrate communities were found following replacement of extensive zones of floating-attached/submergent native vegetation within Fitzroy River backwaters by the major environmental weed Hymenachne amplexicaulis (Poaceae). Impacts of H. amplexicaulis on native littoral flora and fauna (macroinvertebrates and fish) were assessed by comparing three sites previously supporting native vegetation and now invaded by H. amplexicaulis with nearby stands of native backwater vegetation. Plant biomass of Hymenachne plant beds was 30-fold greater than native plant beds, whereas plant species diversity (richness) was significantly less. Macroinvertebrate communities of Hymenachne beds were significantly lower in abundance of insect orders Ephemeroptera, Hemiptera and Odonata, while Coleoptera were more abundant in Hymenachne beds. Non-metric multidimensional scaling ordination of macroinvertebrate family abundance and composition data showed that Hymenachne plant beds had a different assemblage to that in native plant beds. In common with other studies of weed invasions, an increased abundance of some vertebrate fauna was observed (in this case an introduced fish species Xiphophorus maculatus comprised 75% of fish captured in Hymenachne beds compared with 0% in native plant beds). Change in vegetation structure was implicated as an important factor influencing macroinvertebrate and fish faunal composition, and with potential to impact on waterbird habitat values of wetlands.

A new genus, Cryptassiminea, is introduced for the taxon previously known as Assiminea buccinoides (Quoy & Gaimard). These small gastropods are abundant in mangrove and salt marsh habitats in south-eastern and subtropical eastern Australia. Seven species (five new) are recognised using morphological characters in the complex previously treated as a single species. Five taxa have rather narrow ranges while the other two are widespread and often sympatric. Two groups of species are recognised. One contains Cryptassiminea buccinoides, widespread in south-east and east Australia, and two closely related allopatric taxa from South Australia and south-eastern Tasmania (C. adelaidensis, sp. nov. and C. kershawi, sp. nov.). A second group of species is typified by Cryptassiminea tasmanica (Tenison-Woods), also widespread in east and south-east Australia and often sympatric with C. buccinoides. Allied to C. tasmanica, are two closely related taxa from western Victoria: C. glenelgensis, sp. nov. from the Glenelg River estuary and C. surryensis, sp. nov. from the Surry River estuary and Western Port, in the vicinity of Geelong. A distinctive species, Cryptassiminea insolata, sp. nov. from the east coast of Queensland, also has similarities with C. tasmanica. A cladistic analysis using morphological characters of the Cryptassiminea taxa and three other genera of Assimininae, with an omphalotropidine as the outgroup, resulted in a single tree. The new genus has rather poor support, possibly because many of its characters appear to be plesiomorphic within Assimineinae. Cryptassiminea is defined by a unique combination of characters but lacks any obvious synapomorphy. Two clades within Cryptassiminea are well supported, each containing the species-groups referred to above.

Estuarine floodplain wetland pools occur adjacent to marine coasts and estuaries throughout the world. In Australia’s dry tropics and sub-tropics, low and irregular rainfall means estuarine wetland pools are isolated for much of the time, resulting in varied within-pool conditions, with chemistry ranging from fresh to hypersaline, depending on the balance between freshwater and marine inputs and the time between connections. Varied physical conditions and irregular connectivity provide the potential for substantial faunal difference among pools. The present study compares the compositions and structures of the fish fauna of a broad cross section of estuarine wetland pools adjacent to the estuary of the Fitzroy River, one of the largest rivers in Australia’s dry tropical/subtropical zone. Ten pools were sampled between February 2004 and May 2005. The total species richness was low, with the 6123 fish recorded over the study, comprising only 44 species. This low species richness was reflected at the individual pool level, with a maximum total richness of 25 species in a single pool. Different pools had faunas that differed as a function of the proportion of the community comprised of marine spawned, compared with freshwater spawned, species. This was a reflection of the extent of connectivity to freshwater and marine systems, which determined both the physical nature of pools and the sources of faunal supply. Despite faunal differences among pools, at a functional level pool fish faunas were dominated by detritivores, regardless of pool type, size, season or connectedness.

This study records and documents the most severe and notable instance ever reported of sudden and widespread dieback of mangrove vegetation. Between late 2015 and early 2016, extensive areas of mangrove tidal wetland vegetation died back along 1000km of the shoreline of Australia’s remote Gulf of Carpentaria. The cause is not fully explained, but the timing was coincident with an extreme weather event; notably one of high temperatures and low precipitation lacking storm winds. The dieback was severe and widespread, affecting more than 7400ha or 6% of mangrove vegetation in the affected area from Roper River estuary in the Northern Territory, east to Karumba in Queensland. At the time, there was an unusually lengthy period of severe drought conditions, unprecedented high temperatures and a temporary drop in sea level. Although consequential moisture stress appears to have contributed to the cause, this occurrence was further coincidental with heat-stressed coral bleaching. This article describes the effect and diagnostic features of this severe dieback event in the Gulf, and considers potential causal factors.

The freshwater-flow requirements of estuarine fisheries in tropical areas are reviewed, with reference to species important to fisheries in northern Australia. Fisheries production, in terms of catch, is often elevated during, or as a consequence of, years with higher river flow, but the causality of these relationships often remains unproven. Scientific information on the freshwater-flow requirements important to fisheries production is increasingly being sought during the planning, allocation and management of water resources within Australia and in other countries around the world. Frequently, such advice is based on the analysis of catch and freshwater flow (or rainfall), or on life-history information. Clarifying fisheries-specific goals of water management would assist in prioritising research into the freshwater-flow requirements of estuarine fisheries. A framework that integrates life-history information and correlative analyses is suggested to assist in understanding the freshwater-flow requirements of estuarine fisheries. The framework is also useful in identifying knowledge gaps and pertinent research questions. The approach is illustrated through its application to identifying key freshwater-flow events likely to be important for fisheries production in a dry tropical estuary in Queensland, Australia.

AbstractThis paper presents the first records of the parasitic copepod Caligus furcisetifer Redkar, Rangnekar et Murti, 1949 beyond Indian waters, specifically, on the body surface and head of the critically endangered largetooth sawfish (commonly referred to as the freshwater sawfish in Australia), Pristis microdon Latham, 1794 (Elasmobranchii, Pristidae), in brackish tidal waters of the Fitzroy River in the Kimberley region of Western Australia and the Leichhardt River in the Gulf of Carpentaria in northern Queensland. This represents a geographic range extension of ∼8000 km for this parasite. Further, it is only the second member of the genus Caligus to be found on an elasmobranch host in Western Australia and it is the first time this species has been reported from the Southern Hemisphere. Male biased dispersal of P. microdon may be the vector in which the parasite has dispersed from India across to northern Australia, or vice versa. A decline in populations of the critically endangered P. microdon (and possibly other pristid species) in these regions may lead to a concomitant decline in their parasite fauna.

In 2013, the Capricornia Arts Mob (CAM), an Indigenous collective of artists situated in Rockhampton, central Queensland, Australia, successfully tendered for one of three public art projects that were grouped under the title Flood Markers (Roberts; Roberts and Mackay; Robinson and Mackay). Commissioned as part of the Queensland Government's Community Development and Engagement Initiative, Flood Markers aims to increase awareness of Rockhampton’s history, with particular focus on the Fitzroy River and the phenomena of flooding. Honouring Land Connections is CAM’s contribution to the project and consists of several “memory poles” that stand alongside the Fitzroy River in Toonooba Park. Rockhampton lies on Dharumbal Country with Toonooba being the Dharumbal name for the Fitzroy River and the inspiration for the work due to its cultural significance to the Aboriginal people of that region. The name Toonooba, as well as other images and icons including boomerangs, spears, nets, water lily, and frogs, amongst others, are carved, burnt, painted and embedded into the large ironbark poles. These stand with the river on one side and the colonial infrastructure of Rockhampton on the other (see fig. 1, 2 and 3).Figure 1 Figure 2Figure 3Within this article, we discuss Honouring Land Connections as having two main functions which contribute to its significance as Indigenous cultural expression and identity affirmation. Firstly, the memory poles (as well as the process of sourcing materials and producing the final product) are a manifestation of Country and a representation of its stories and lived memories. Honouring Land Connections provides a means for Aboriginal people to revel in Country and maintain connections to a vital component of their being as Indigenous. Secondly, by revealing Indigenous stories, experiences, and memories, Honouring Land Connections emphasises Indigenous voices and perspectives within a place dominated by Eurocentric outlooks and knowledges. Toonooba provides the backdrop on which the complexities of cultural and identity formation within settler-colonial spaces are highlighted whilst revelling in continuous Indigenous presence.Flood Markers as ArtArtists throughout the world have used flood markers as a means of visual expression through which to explore and reveal local histories, events, environments, and socio-cultural understandings of the relationships between persons, places, and the phenomena of flooding. Geertz describes art as a social text embedded within wider socio-cultural systems; providing insight into cultural, social, political, economic, gendered, religious, ethnic, environmental, and biographical contexts. Flood markers are not merely metric tools used for measuring the height of a river, but rather serve as culture artefacts or indexes (Gell Art and Agency; Gell "Technology of Enchantment") that are products and producers of socio-culture contexts and the memories and experiences embedded within them. Through different methods, mediums, and images, artists have created experiential and intellectual spaces where those who encounter their work are encouraged to engage their surroundings in thought provoking and often-new ways.In some cases, flood markers have brought attention to the “character and natural history” of a particular place, where artists such as Louise Lavarack have sought to provoke consciousness of the movement of water across flood plains (Lavarack). In other works, flood markers have served as memorials to individuals such as Gilbert White whose daughter honoured his life and research through installing a glass spire at Boulder Creek, Colorado in 2011 (White). Tragedies such as Hurricane Katrina in New Orleans in 2005 have also been commemorated through flood markers. Artist Christopher Saucedo carved 1,836 waves into a freestanding granite block; each wave representing a life lost (University of New Orleans). The weight of the granite symbolises the endurance and resilience of those who faced, and will continue to face, similar forces of nature. The Pillar of Courage erected in 2011 in Ipswich, Queensland, similarly contains the words “resilience, community, strength, heroes, caring and unity” with each word printed on six separate sections of the pillar, representing the six major floods that have hit the region (Chudleigh).Whilst these flood markers provide valuable insights into local histories, specific to each environmental and socio-cultural context, works such as the Pillar of Courage fail to address Indigenous relationships to Country. By framing flooding as a “natural disaster” to be overcome, rather than an expression of Country to be listened to and understood, Euro and human-centric perspectives are prioritised over Indigenous ways of knowing and being. Indigenous knowledges however encourages a reorientation of Eurocentric responses and relationships to Country, and in doing so challenge compartmentalised views of “nature” where flooding is separated from land and Country (Ingold Perception; Seton and Bradley; Singer). Honouring Land Connections symbolises the voice and eternal presence of Toonooba and counters presentations of flooding that depict it as historian Heather Goodall (36) once saw “as unusual events of disorder in which the river leaves its proper place with catastrophic results.”Country To understand flooding from Indigenous perspectives it is first necessary to discuss Country and apprehend what it means for Indigenous peoples. Country refers to the physical, cosmological, geographical, relational, and emotional setting upon which Indigenous identities and connections to place and kin are embedded. Far from a passive geographic location upon which interactions take place, Country is an active and responsive agent that shapes and contextualises social interactions between and amongst all living beings. Bob Morgan writes of how “Country is more than issues of land and geography; it is about spirituality and identity, knowing who we are and who we are connected to; and it helps us understand how all living things are connected.” Country is also an epistemological frame that is filled with knowledge that may be known and familiarised whilst being knowledge itself (Langton "Sacred"; Rose Dingo; Yunupingu).Central to understanding Country is the fact that it refers to a living being’s spiritual homeland which is the ontological place where relationships are formed and maintained (Yunupingu). As Country nurtures and provides the necessities for survival and prosperity, Indigenous people (but also non-Indigenous populations) have moral obligations to care for Country as kin (Rose Nourishing Terrains). Country is epistemic, relational, and ontological and refers to both physical locations as well as modes of “being” (Heidegger), meaning it is carried from place to place as an embodiment within a person’s consciousness. Sally Morgan (263) describes how “our country is alive, and no matter where we go, our country never leaves us.” Country therefore is fluid and mobile for it is ontologically inseparable to one’s personhood, reflected through phrases such as “I am country” (B. Morgan 204).Country is in continuous dialogue with its surroundings and provides the setting upon which human and non-human beings; topographical features such as mountains and rivers; ancestral beings and spirits such as the Rainbow Snake; and ecological phenomena such as winds, tides, and floods, interact and mutually inform each other’s existence (Rose Nourishing Terrains). For Aboriginal people, understanding Country requires “deep listening” (Atkinson; Ungunmerr), a responsive awareness that moves beyond monological and human-centric understandings of the world and calls for deeper understandings of the mutual and co-dependant relationships that exist within it. The awareness of such mutuality has been discussed through terms such as “kincentrism” (Salmón), “meshworks” (Ingold Lines), “webs of connection” (Hokari), “nesting” (Malpas), and “native science” (Cajete). Such concepts are ways of theorising “place” as relational, physical, and mental locations made up of numerous smaller interactions, each of which contribute to the identity and meaning of place. Whilst each individual agent or object retains its own autonomy, such autonomy is dependent on its wider relation to others, meaning that place is a location where “objectivity, subjectivity and inter-subjectivity converge” (Malpas 35) and where the very essence of place is revealed.Flooding as DialogueWhen positioned within Indigenous frameworks, flooding is both an agent and expression of Toonooba and Country. For the phenomenon to occur however, numerous elements come into play such as the fall of rain; the layout of the surrounding terrain; human interference through built weirs and dams; and the actions and intervention of ancestral beings and spirits. Furthermore, flooding has a direct impact on Country and all life within it. This is highlighted by Dharumbal Elder Uncle Billy Mann (Fitzroy Basin Association "Billy Mann") who speaks of the importance of flooding in bringing water to inland lagoons which provide food sources for Dharumbal people, especially at times when the water in Toonooba is low. Such lagoons remain important places for fishing, hunting, recreational activities, and cultural practices but are reliant on the flow of water caused by the flowing, and at times flooding river, which Uncle Mann describes as the “lifeblood” of Dharumbal people and Country (Fitzroy Basin Association "Billy Mann"). Through her research in the Murray-Darling region of New South Wales, Weir writes of how flooding sustains life though cycles that contribute to ecological balance, providing nourishment and food sources for all beings (see also Cullen and Cullen 98). Water’s movement across land provokes the movement of animals such as mice and lizards, providing food for snakes. Frogs emerge from dry clay plains, finding newly made waterholes. Small aquatic organisms flourish and provide food sources for birds. Golden and silver perch spawn, and receding waters promote germination and growth. Aboriginal artist Ron Hurley depicts a similar cycle in a screen-print titled Waterlily–Darambal Totem. In this work Hurley shows floodwaters washing away old water lily roots that have been cooked in ant bed ovens as part of Dharumbal ceremonies (UQ Anthropology Museum). The cooking of the water lily exposes new seeds, which rains carry to nearby creeks and lagoons. The seeds take root and provide food sources for the following year. Cooking water lily during Dharumbal ceremonies contributes to securing and maintaining a sustainable food source as well as being part of Dharumbal cultural practice. Culture, ecological management, and everyday activity are mutually connected, along with being revealed and revelled in. Aboriginal Elder and ranger Uncle Fred Conway explains how Country teaches Aboriginal people to live in balance with their surroundings (Fitzroy Basin Association "Fred Conway"). As Country is in constant communication, numerous signifiers can be observed on land and waterscapes, indicating the most productive and sustainable time to pursue certain actions, source particular foods, or move to particular locations. The best time for fishing in central Queensland for example is when Wattles are in bloom, indicating a time when fish are “fatter and sweeter” (Fitzroy Basin Association "Fred Conway"). In this case, the Wattle is 1) autonomous, having its own life cycle; 2) mutually dependant, coming into being because of seasonal weather patterns; and 3) an agent of Country that teaches those with awareness how to respond and benefit from its lessons.Dialogue with Country As Country is sentient and responsive, it is vital that a person remains contextually aware of their actions on and towards their surroundings. Indigenous peoples seek familiarity with Country but also ensure that they themselves are known and familiarised by it (Rose Dingo). In a practice likened to “baptism”, Langton ("Earth") describes how Aboriginal Elders in Cape York pour water over the head of newcomers as a way of introducing them to Country, and ensuring that Country knows those who walk upon it. These introductions are done out of respect for Country and are a way of protecting outsiders from the potentially harmful powers of ancestral beings. Toussaint et al. similarly note how during mortuary rites, parents of the deceased take water from rivers and spit it back into the land, symbolising the spirit’s return to Country.Dharumbal man Robin Hatfield demonstrates the importance of not interfering with the dialogue of Country through recalling being told as a child not to disturb Barraru or green frogs. Memmott (78) writes that frogs share a relationship with the rain and flooding caused by Munda-gadda, the Rainbow Snake. Uncle Dougie Hatfield explains the significance of Munda-gadda to his Country stating how “our Aboriginal culture tells us that all the waterways, lagoons, creeks, rivers etc. and many landforms were created by and still are protected by the Moonda-Ngutta, what white people call the Rainbow Snake” (Memmott 79).In the case of Robin Hatfield, to interfere with Barraru’s “business” is to threaten its dialogue with Munda-gadda and in turn the dialogue of Country in form of rain. In addition to disrupting the relational balance between the frog and Munda-gadda, such actions potentially have far-reaching social and cosmological consequences. The rain’s disruption affects the flood plains, which has direct consequences for local flora and transportation and germination of water lily seeds; fauna, affecting the spawning of fish and their movement into lagoons; and ancestral beings such as Munda-gadda who continue to reside within Toonooba.Honouring Land Connections provided artists with a means to enter their own dialogue with Country and explore, discuss, engage, negotiate, and affirm aspects of their indigeneity. The artists wanted the artwork to remain organic to demonstrate honour and respect for Dharumbal connections with Country (Roberts). This meant that materials were sourced from the surrounding Country and the poles placed in a wave-like pattern resembling Munda-gadda. Alongside the designs and symbols painted and carved into the poles, fish skins, birds, nests, and frogs are embalmed within cavities that are cut into the wood, acting as windows that allow viewers to witness components of Country that are often overlooked (see fig. 4). Country therefore is an equal participant within the artwork’s creation and continuing memories and stories. More than a representation of Country, Honouring Land Connections is a literal manifestation of it.Figure 4Opening Dialogue with Non-Indigenous AustraliaHonouring Land Connections is an artistic and cultural expression that revels in Indigenous understandings of place. The installation however remains positioned within a contested “hybrid” setting that is informed by both Indigenous and settler-colonial outlooks (Bhabha). The installation for example is separated from the other two artworks of Flood Markers that explore Rockhampton’s colonial and industrial history. Whilst these are positioned within a landscaped area, Honouring Land Connections is placed where the grass is dying, seating is lacking, and is situated next to a dilapidated coast guard building. It is a location that is as quickly left behind as it is encountered. Its separation from the other two works is further emphasised through its depiction in the project brief as a representation of Rockhampton’s pre-colonial history. Presenting it in such a way has the effect of bookending Aboriginal culture in relation to European settlement, suggesting that its themes belong to a time past rather than an immediate present. Almost as if it is a revelation in and of itself. Within settler-colonial settings, place is heavily politicised and often contested. In what can be seen as an ongoing form of colonialism, Eurocentric epistemologies and understandings of place continue to dominate public thought, rhetoric, and action in ways that legitimise White positionality whilst questioning and/or subjugating other ways of knowing, being, and doing (K. Martin; Moreton-Robinson; Wolfe). This turns places such as Toonooba into agonistic locations of contrasting and competing interests (Bradfield). For many Aboriginal peoples, the memories and emotions attached to a particular place can render it as either comfortable and culturally safe, or as unsafe, unsuitable, unwelcoming, and exclusionary (Fredericks). Honouring Land Connections is one way of publicly asserting and recognising Toonooba as a culturally safe, welcoming, and deeply meaningful place for Indigenous peoples. Whilst the themes explored in Honouring Land Connections are not overtly political, its presence on colonised/invaded land unsettles Eurocentric falsities and colonial amnesia (B. Martin) of an uncontested place and history in which Indigenous voices and knowledges are silenced. The artwork is a physical reminder that encourages awareness—particularly for non-Indigenous populations—of Indigenous voices that are continuously demanding recognition of Aboriginal place within Country. Similar to the boomerangs carved into the poles representing flooding as a natural expression of Country that will return (see fig. 5), Indigenous peoples continue to demand that the wider non-Indigenous population acknowledge, respect, and morally responded to Aboriginal cultures and knowledges.Figure 5Conclusion Far from a historic account of the past, the artists of CAM have created an artwork that promotes awareness of an immediate and emerging Indigenous presence on Country. It creates a space that is welcoming to Indigenous people, allowing them to engage with and affirm aspects of their living histories and cultural identities. Through sharing stories and providing “windows” into Aboriginal culture, Country, and lived experiences (which like the frogs of Toonooba are so often overlooked), the memory poles invite and welcome an open dialogue with non-Indigenous Australians where all may consider their shared presence and mutual dependence on each other and their surroundings.The memory poles are mediatory agents that stand on Country, revealing and bearing witness to the survival, resistance, tenacity, and continuity of Aboriginal peoples within the Rockhampton region and along Toonooba. Honouring Land Connections is not simply a means of reclaiming the river as an Indigenous space, for reclamation signifies something regained after it has been lost. What the memory poles signify is something eternally present, i.e. Toonooba is and forever will be embedded in Aboriginal Country in which we all, Indigenous and non-Indigenous, human and non-human, share. The memory poles serve as lasting reminders of whose Country Rockhampton is on and describes the life ways of that Country, including times of flood. Through celebrating and revelling in the presence of Country, the artists of CAM are revealing the deep connection they have to Country to the wider non-Indigenous community.ReferencesAtkinson, Judy. Trauma Trails, Recreating Song Lines: The Transgenerational Effects of Trauma in Indigenous Australia. Spinifex Press, 2002.Bhabha, Homi, K. The Location of Culture. Taylor and Francis, 2012.Bradfield, Abraham. "Decolonizing the Intercultural: A Call for Decolonizing Consciousness in Settler-Colonial Australia." Religions 10.8 (2019): 469.Cajete, Gregory. Native Science: Natural Laws of Interdependence. 1st ed. 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Urban-industrial seascapes are prevalent around the world, yet we lack a basic understanding of how the mosaic of different habitats in these areas are used by mobile marine fauna, including features such as industrial ports and marinas. Urbanised areas have been alternately characterised in scientific literature as degraded, depauperate, or in some cases diverse and abundant. To advance our spatial and temporal understanding of the community of mobile marine fauna in these areas, we used repeated sonar image sampling over large swathes of two urban-industrial seascapes, combined with underwater video. 2,341 sonar segments were captured across Mackay Harbour and the Pioneer River estuary (North Queensland, Australia). We used this information to generate a preliminary understanding of the ecology of these locations. We found that overall, urban-industrial seascapes can contain counts of mobile marine fauna similar to natural areas, and that these seascapes are characterised by dynamic diel shifts in the spatial arrangement of mobile marine fauna in the water column. At night, large fish are prevalent in the water column, while during the day, assemblages are dominated by small fish. Within these urban-industrial seascapes, deeper areas containing heavy infrastructure such as ports can harbour large densities of fish, including heavily targeted fisheries species. These areas deserve recognition as marine habitat, are of consequence to fisheries, and have the potential to influence surrounding ecosystems. Important research questions remain regarding their impact on food webs and animal movement at larger scales.