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Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Estuaries Australia"

1

Gillanders, Bronwyn M., Travis S. Elsdon, Ian A. Halliday, Gregory P. Jenkins, Julie B. Robins, and Fiona J. Valesini. "Potential effects of climate change on Australian estuaries and fish utilising estuaries: a review." Marine and Freshwater Research 62, no. 9 (2011): 1115. http://dx.doi.org/10.1071/mf11047.

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Estuaries are especially vulnerable to the impacts of climate change because changes in climatic and hydrologic variables that influence freshwater and marine systems will also affect estuaries. We review potential impacts of climate change on Australian estuaries and their fish. Geographic differences are likely because southern Australian climates are predicted to become warmer and drier, whereas northern regions may see increased precipitation. Environmental factors, including salinity gradients, suspended sediment, dissolved oxygen and nutrient concentrations, will be influenced by changing freshwater input and other climate variables. Potential impacts will vary depending on the geomorphology of the estuary and the level of build-up of sand bars across estuarine entrances. Changes to estuarine fish assemblages will depend on associated changes to salinity and estuarine-mouth morphology. Marine migrants may be severely affected by closure of estuarine mouths, depending on whether species ‘must’ use estuarine habitat and the level of migratory v. resident individuals. Depending on how fish in coastal waters locate estuaries, there may be reduced cues associated with estuarine mouths, particularly in southern Australia, potentially influencing abundance. In summary, climate change is expected to have major consequences for Australian estuaries and associated fish, although the nature of impacts will show significant regional variation.
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Tremblin, Clément M., Maria Holzmann, Justin H. Parker, Aleksey Sadekov, and David W. Haig. "Invasive Japanese foraminifera in a south-west Australian estuary." Marine and Freshwater Research 73, no. 3 (November 24, 2021): 328–42. http://dx.doi.org/10.1071/mf21254.

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An invasive foraminiferan is recorded for the first time in an Australian estuary. Trochammina hadai, originally described as endemic from Japan and subsequently found to be alien in coastal waters of California and Brazil, has been identified in estuarine sediment in the vicinity of Bunbury Port in Western Australia. Species determination is based on morphological, molecular and ecological similarities to the Japanese type. The species has not been recorded in other estuaries in Australia. Bunbury Port is a major exporter of woodchip to Japan and the introduction of T. hadai may have come from ballast water out of shallow-draught woodchip vessels. Small sediment samples of estuarine mud obtained at water depths of ~5 m contain abundant T. hadai (on average ~0.4 mm in adult diameter) that are easily recognised in microscopic view of the sediment surface by their bright reddish-brown colour. The collection of sediment samples from the estuarine floor and ballast water, and the examination of these for foraminifers, may provide a useful indicator in estuaries for the possible presence of other exotic species, particularly in the vicinity of ports.
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3

Hodgkin, Ernest P., and Patrick Hesp. "Estuaries to salt lakes: Holocene transformation of the estuarine ecosystems of south-western Australia." Marine and Freshwater Research 49, no. 3 (1998): 183. http://dx.doi.org/10.1071/mf96109.

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When the estuaries of south-western Australia were first flooded by the Holocene marine transgression about 7000 years before present (BP), most were enclosed by limestone barrier dunes. Coastal sand drift built bars and flood-tide deltas in the narrow entrances, but until about 3500 years BP the estuaries remained tidal-dominated systems with a diverse marine–estuarine fauna. Now the bars/deltas so obstruct the small tides that estuary water is fresh in winter and marine to hypersaline in summer; the estuaries are river-flow-dominated systems and the ecosystems are characterised by a restricted euryhaline estuarine biota. Some estuaries are still permanently open, their bars/deltas never close, and some are seasonally open, their bars open with river flow in winter and close in summer. Other estuaries are normally closed, their bars remain closed for several years and break with episodic flood flow, or are permanently closed coastal salt lakes with bars that never or rarely break: they can become grossly hypersaline and may dry up altogether. An hypothesis to explain this Holocene transformation of the estuaries attributes it principally to sedimentary processes in an environment where river flow is highly seasonal, tides are microtidal, there was a fall in sea level, and there are differences in the volume and periodicity of flow and the degree of shelter to the entrances from the prevailing south-west winds and swell.
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O'Mara, K., A. Miskiewicz, and M. Y. L. Wong. "Estuarine characteristics, water quality and heavy metal contamination as determinants of fish species composition in intermittently open estuaries." Marine and Freshwater Research 68, no. 5 (2017): 941. http://dx.doi.org/10.1071/mf15409.

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Estuaries are critical aquatic environments that are used by many fish during their life cycle. However, estuaries often suffer from poor water quality as a result of anthropogenic activities. Fish diversity studies in estuaries are common, although few have examined whether correlations exist between water quality, metal contamination and fish assemblages. In the present study we investigated the effect of abiotic conditions, heavy metals and estuary characteristics on the abundance, diversity and composition of fish in four intermittently open estuaries along the Illawarra coast of south-eastern Australia. The heterogeneity of environmental conditions was reflected in the fish assemblages in each estuary. Environmental variables predicted fish species composition, and estuaries in particularly poor condition contained few species (estuarine residents) in high abundance, indicating their ability to acclimatise and survive in conditions that are hostile to other species. Overall, these findings demonstrate that estuarine fish assemblages may be useful indicators of estuary condition and reveal the importance of managing anthropogenic activities in the surrounding catchment to improve water quality so that biodiversity of fish can be restored in these estuarine environments.
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5

Fury, Christine A., and Peter L. Harrison. "Abundance, site fidelity and range patterns of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in two Australian subtropical estuaries." Marine and Freshwater Research 59, no. 11 (2008): 1015. http://dx.doi.org/10.1071/mf08109.

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Bottlenose dolphins are widely studied in marine habitats, but information on estuarine populations is very limited. The present study provides the first published data on bottlenose dolphins in Australian estuaries. Abundance estimates, site fidelity and individual ranging patterns were examined over a 3-year period for Indo-Pacific bottlenose dolphins (Tursiops aduncus) inhabiting the Clarence River (CR) and Richmond River (RR) estuaries in northern New South Wales, Australia. Mark–recapture analyses estimated 71 (62–81 95% CI) dolphins utilised the CR whereas 34 (19–49 95% CI) used the RR. Differences in site fidelity were observed between the estuaries, with 60% and 37% of identified dolphins determined as residents, 26% and 21% as occasional visitors and 14% and 42% as transients for the CR and RR respectively. Resource partitioning was apparent in both estuaries with the mean distance resident dolphins were found upstream from the river mouth being greater than occasional visitors and transients. The Clarence River sustains a larger, predominantly resident dolphin community compared with the Richmond River, which supports a relatively small dolphin community with lower site fidelity. Management of future increased anthropogenic disturbances is needed to ensure the long-term survival of these dolphin populations.
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6

Hadwen, Wade L., Grant L. Russell, and Angela H. Arthington. "Gut content- and stable isotope-derived diets of four commercially and recreationally important fish species in two intermittently open estuaries." Marine and Freshwater Research 58, no. 4 (2007): 363. http://dx.doi.org/10.1071/mf06157.

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Despite remaining closed for variable periods, intermittently open estuaries provide habitat for estuarine and marine fish species of commercial and recreational value. To better understand how these systems trophically support their fish assemblages, the diets of four valued fish species, namely Acanthopagrus australis, Platycephalus fuscus, Sillago ciliata and Mugil cephalus, were examined in two intermittently open estuaries in New South Wales, Australia. Fish diets were determined using both gut contents and stable isotope analyses because the different temporal resolutions afforded by these methods can provide insight into the flexibility of fish diets. Stable isotope signatures of prey and fish proved to be particularly useful in analyses of the diets of M. cephalus and P. fuscus, because these species consume large quantities of unidentifiable organic matter and have high incidences of empty guts respectively. Diet reconstructions across methods were generally consistent for A. australis, but differed substantially for S. ciliata, with fewer prey taxa identified in the guts than expected. This result suggests that individual S. ciliata switch between local resources on the basis of their fluctuating temporal availability. Trophic flexibility, coupled with broad physicochemical tolerances, enables these species to flourish in the challenging environment of intermittently open estuaries.
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7

Pusey, Bradley J., Mark J. Kennard, Helen K. Larson, Quentin Alsop, Michael Hammer, and Duncan J. Buckle. "Estuarine fishes of the South Alligator River, Kakadu National Park, northern Australia." Marine and Freshwater Research 67, no. 12 (2016): 1797. http://dx.doi.org/10.1071/mf15221.

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Estuaries are recognised globally as areas of high production, diversity and high economic value. Exploitation of the economic potential of estuaries and attendant infrastructural development plus expansion of human populations has resulted in degradation of estuaries worldwide. Many estuaries of northern Australia, in contrast, remain in good ecological condition. The estuarine fish fauna of the South Alligator River, Kakadu region of northern Australia was investigated to determine seasonal and spatial variation in composition. Beam trawls were used at 94 locations over the wet and dry seasons of 2012. In total, 81 taxa were collected, 26 of which had not previously been recorded in the river. Sciaenidae and Engraulidae dominated species richness and abundance. Samples were heterogeneous in terms of composition and abundance in a manner unrelated to any measured aspect of the habitat over which trawls occurred. Species richness was higher in the lower estuary than the upper estuary and more species were detected during the wet season. Turnover in assemblage structure between sampling occasions was associated with seasonal variation in discharge concordant with changes in salinity and potentially productivity. Compositional variation was largely ascribed to differential spawning phenology of adults and tolerance to fluctuating salinity. The Kakadu region supports a rich fish fauna moderately distinct from that observed elsewhere in the Northern Territory. Pronounced temporal turnover in assemblage structure and spatial variation at a variety of scales (i.e. within samples, and within and between rivers) collectively pose a challenge to management in light of ongoing and proposed development of the water resources of northern Australia, including its estuaries.
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Creighton, Colin, Paul I. Boon, Justin D. Brookes, and Marcus Sheaves. "Repairing Australia's estuaries for improved fisheries production – what benefits, at what cost?" Marine and Freshwater Research 66, no. 6 (2015): 493. http://dx.doi.org/10.1071/mf14041.

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An Australia-wide assessment of ~1000 estuaries and embayments undertaken by the National Land and Water Resources Audit of 1997–2002 indicated that ~30% were modified to some degree. The most highly degraded were in New South Wales, where ~40% were classified as ‘extensively modified’ and <10% were ‘near pristine’. Since that review, urban populations have continued to grow rapidly, and increasing pressures for industrial and agricultural development in the coastal zone have resulted in ongoing degradation of Australia's estuaries and embayments. This degradation has had serious effects on biodiversity, and commercial and recreational fishing. A business case is developed that shows that an Australia-wide investment of AU$350 million into repair will be returned in less than 5 years. This return is merely from improved productivity of commercial fisheries of a limited number of fish, shellfish and crustacean species. Estuary repair represents an outstanding return on investment, possibly far greater than most of Australia's previous environmental repair initiatives and with clearly demonstrated outcomes across the Australian food and services economies.
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9

Ferrell, DJ, SE McNeill, DG Worthington, and JD Bell. "Temporal and spatial variation in the abundance of fish associated with the seagrass Posidonia australis in South-eastern Australia." Marine and Freshwater Research 44, no. 6 (1993): 881. http://dx.doi.org/10.1071/mf9930881.

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A beam trawl was used to sample fish associated with the seagrass Posidonia australis between September 1988 and June 1990. We describe variation in abundance of fish at two spatial scales: among three seagrass beds 1-10 km apart within each of three estuaries, and among the estuaries separated by at least 100 km. Most species had significant differences in abundance among sites and estuaries that changed through time. However, many species also had consistent patterns in abundance among sites and among estuaries. For example, there were large and consistent differences in the abundance of many species among the three estuaries. Widespread changes in abundance (ie: changes that took place at all sites within an estuary or in most estuaries) were not common. The two spatial scales used in this study are also logical scales for management of seagrass habitats. The consistent differences in abundance of some fish found at both spatial scales will complicate management decisions.
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10

Watts, Robyn J., and Michael S. Johnson. "Estuaries, lagoons and enclosed embayments: habitats that enhance population subdivision of inshore fishes." Marine and Freshwater Research 55, no. 7 (2004): 641. http://dx.doi.org/10.1071/mf04051.

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Several studies have suggested that estuaries, lagoons and enclosed embayments may offer special opportunities for local subdivision in marine species. We used data from published papers and unpublished theses to examine the effect of such water bodies on allozyme differentiation of seven species of inshore fishes in Western Australia. We included species that differ in their dispersal, and hence their intrinsic potential for gene flow. Over large distances, subdivision was generally greater among estuarine populations than among conspecific marine populations collected over similar distances. Over small distances, paired marine and estuarine samples were generally more divergent than pairs of marine samples separated by similar distances. For species with a low capability for dispersal, estuaries appear to add to the high levels of genetic subdivision that commonly result from other factors. Under special circumstances estuaries may also provide opportunities for genetic divergence in species with a high capability of dispersal that are rarely subdivided at a large geographical scale. These observations indicate that estuaries can increase the genetic subdivision of populations of inshore fishes, and that species that use both marine and estuarine habitats are likely to have greater genetic subdivision than those that are restricted to marine habitats.
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Більше джерел

Дисертації з теми "Estuaries Australia"

1

Chuwen, Benjamin Michael. "Characteristics of the ichthyofaunas of offshore waters in different types of estuary in Western Australia, including the biology of black bream Acanthopagrus butcheri /." Murdoch University Digital Theses Program, 2009. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20100210.154423.

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2

Deeley, D. M. "Evaluating indicators of ecological health for estuaries in southwest Australia." Thesis, Deeley, D.M. (2001) Evaluating indicators of ecological health for estuaries in southwest Australia. PhD thesis, Murdoch University, 2001. https://researchrepository.murdoch.edu.au/id/eprint/3371/.

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A broad range of environmental indicators were evaluated to determine their suitability for describing the early onset of nutrient enrichment in south-west Australian estuaries. The southwest of Australia experiences a Mediterranean climate with hot dry summers and cool wet winters. Most of the south-west estuarine catchments have been extensively cleared for agricultural and urban development and have been loosing unacceptably high loads of nutrients. Symptoms of nutrient enrichment have been observed in many south-west estuaries. An evaluation of fifty years of historical water quality data defined the range of normal behaviour for these systems together with the nature of rarer extreme events. It was found that south-west Australian estuaries are highly variable in space and time and appear to be more susceptible to nutrient enrichment than those observed elsewhere in Australia. While there may be significant fluctuations in physico-chemical conditions and the structure of biological communities in ecosystems subjected to natural variability and anthropogenic stressors, it is possible that the junction of biological communities in these situations is less affected by these types of perturbations. Several indicators of biological function (rates and processes) were developed and evaluated to determine whether they offered a greater degree of diagnostic precision (early warning) than measures of stocks and status (inventory). In evaluating various environmental indicators, it was found that no single indicator was able to unambiguously define the interactions between physic-chemical and biological processes and the response of these systems to anthropogenic and natural stressors. It has been concluded that a broad range of potential indicators must be evaluated simultaneously, in order to define baseline conditions, measurement endpoints and trends to inform catchment and estuarine management and restoration. Increased confidence in the selected indicator suite can flow from an evaluation of the monotonicity of correlated indicators, especially when assessments show consistent patterns for physico-chemical measures and measures of biotic community structure across several trophic groups. Traditional physic-chemical indicators have provided reliable information in me past, but problems have arisen when relating these measures to biological endpoints, particularly for estuaries with significant seasonal and inter-annual variability. In the absence of biological data for estuarine ecosystems experiencing significant seasonal and inter-annual variability, socio--economic indicators of catchment land use practices may be the only option. Paleolimnological investigations may also provide additional insight into patterns of natural variability over the longer term, but the degree of taxonomic resolution required and requirements for supporting stable isotope analysis, may consume considerable resources. Autotrophic protistans (periphyton, phytoplankton), appear to be useful for describing nutrient enrichment, salinity and other physico-chemical conditions, but complicating factors such as the nature of coupling of secondary predation need to be identified. Autecology of local indicator species also needs to be defined. Zooplankton appear to be limited as environmental indicators, but because of their potential role in grazing and materials transfer, they may be useful as elements of biotic indices across several trophic groups. One of the major impediments to using planktonic organisms for inferring the condition of estuarine health is the considerable vertical, horizontal and temporal heterogeneity displayed by these organisms in both disturbed and undisturbed systems. More recently, benthic macro-invertebrates have been successfully used to describe the nature and magnitude of organic enrichment of estuaries. Community structure, biomass and relative abundance of functional groups and indicator species have also been developed and used as environmental indicators. Problems may occur in the use of these organisms to infer health in south-west estuaries because of the presence of naturally immature communities and variable colonization dynamics where there is significant seasonal and inter-annual variability. Inventory measures of community structure have problems because of a lack of information about exchange pathways connecting system components and unknown interactions between diversity, stability and resilience of the ecosystem. Species richness, diversity indices and measures of biomass have probably been the most widely used indicators in the majority of published works, but generally without appropriate critical analysis of their utility. Biomass appears to have less inter-annual variability than do other measures of community structure. A myriad of biotic indices (ratios of functional groups) within and across trophic levels have been described in the international literature. There are problems in defining weightings and concordance methods for elements contributing to biotic indices and the loss of valuable information during these types of data reduction limit their potential. Detailed autecology of members of functional groups are required for biotic indices and this type of information is potentially available for some cosmopolitan species, but generally lacking for endemic species which may describe important nuances of the local environment. As with biotic indices, there is a range of combined metrics described in the literature. Metrics generally combine physico-chemical elements, and may include some biological information. Many of the problems with biotic indices apply equally to metrics, but when calibrated for a particular local situation, they offer considerable discriminatory power. Assessment of early colonisation dynamics and the responsiveness of periphyton communities to nutrient additions provided insights into some key processes in south-west estuaries. Periphyton communities in estuaries with a past history of nutrient enrichment responded well to nutrient additions while communities in less disturbed estuaries did not respond as readily. This infers that opportunistic species able to respond rapidly to nutrient additions may become established in estuaries having a nutrient enrichment history while they may be less able to maintain a viable presence in less enriched estuaries. While showing promise, additional testing and refinement of these process indicators would better define their potential as early warning indicators of nutrient enrichment for south-west estuaries. For describing the ecological health of south-west Australian estuaries, physico-chemical indicators of catchment and estuarine water quality and socio-economic measures of catchment land use history may be of use. If assumptions about the linearity of interactions between the diversity of biotic communities and the stability and resilience of ecosystem function are valid, then conventional measures of community structure will also provide useful insights. The ongoing selection, evaluation and refinement of environmental indicators for assessing the ecological health of south-west Australian estuaries, needs to proceed as a close partnership between land and waterway managers and scientific specialists.
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3

Mazumder, Debashish, and res cand@acu edu au. "Contribution of Saltmarsh to Temperate Estuarine Fish in Southeast Australia." Australian Catholic University. School of Arts and Science (NSW, 2004. http://dlibrary.acu.edu.au/digitaltheses/public/adt-acuvp47.09042006.

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Saltmarsh is an important coastal habitat located in the littoral zone of estuaries. Australian saltmarsh area is decreasing due to agricultural and urban development and invasion by mangrove. The aim of the study was to assess the contribution made by saltmarsh as a habitat and a source of food items for fish. Three saltmarsh sites were studied, with Towra Point chosen as a site for detailed ecological study. When corrected for water volume, fish densities were found to be higher within the saltmarsh compared to the adjacent mangrove. Although the fish assemblages in saltmarshes differed significantly from mangroves the overall ratio between commercially and ecologically valuable species in these habitats are similar, a result suggesting the importance of temperate saltmarsh as habitat for economically important fish. Significant export of crab larva from saltmarsh (average crab larval abundance 2124.63 m-3 outgoing water) is a positive contribution to the estuarine food chain supplementing the nutritional requirements of estuarine fish. While the diet of the crabs producing this larvae seems dependant on the saltmarsh environment (given the contrasting isotopic signatures of Sesarma erythrodactyla in saltmarsh and mangrove, and the similarity of isotopic signatures in the saltmarsh for Sesarma erythrodactyla and Helograpsus haswellianus), the crabs do not seem to be dependent on any of the common species of saltmarsh plant, but rather depend on particulate organic matter (POM) derived from local and other sources. Crab larva are a prey item for many estuarine fish, including commercially important species, as evidenced by gut content analysis of fish visiting the saltmarsh flats during spring tides. The results strongly suggest that emphasis be given to ecosystembased management for an estuary rather than component (e.g., vegetation) based managed as defined by the Fisheries Management Act (1994) and the State Environmental Planning Policy 14.
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4

Krispyn, Kurt N. "The fish faunas of estuaries in the Albany region of south-western Australia." Thesis, Krispyn, Kurt N. (2021) The fish faunas of estuaries in the Albany region of south-western Australia. Honours thesis, Murdoch University, 2021. https://researchrepository.murdoch.edu.au/id/eprint/65015/.

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Estuaries are amongst the most productive ecosystems and act as important nurseries and habitats for aquatic fauna. Microtidal estuaries (tidal range <2 m) are particularly prone to climate change, the effects of which on fish communities and future predictions on their state under climate change are not well understood, especially for small estuaries (<1 km2). This study quantitatively determined the fish fauna in the nearshore and offshore waters of eight microtidal estuaries (including six <1 km2) with varying extents of connectivity to the ocean in the Albany region of south-western Australia. It investigated whether fish faunas were influenced by region, season, “bar status” (i.e., open or closed), and physico-chemical variables. Nearshore waters (<1.5 m) were sampled with four replicate 21.5 m seine nets in each region (lower, basin and upper) in each estuary over four seasons in 2020. Offshore waters (>1.5 m) were sampled using four 160 m composite gill nets set throughout each estuary in the same four seasons. Conductivity and temperature loggers were used to detect any breaches of the sand bar that occurred between sampling occasions. Fish faunas in nearshore and offshore waters were m different among estuaries, and across seasons and regions in shallower waters, although all estuaries were dominated by the same suite of core species. Diversity and faunal composition were highly influenced by salinity and the duration of ocean connectivity. Diversity increased with salinity due to the immigration of marine species up until hypersaline conditions (>50) occurred, however, when salinities exceeded 100 for a protracted period, only a single highly euryhaline estuarine species survived. Permanently-open estuaries, i.e., Oyster Harbour and Waychinicup Estuary, contained the greatest number of species, but lower densities (nearshore) and catch rates (offshore) than those estuaries that open at least once a year, i.e., Torbay, Taylor, Normans and Cheyne inlets and Cordinup River. The normally-closed and extremely hypersaline Beaufort Inlet was depauperate and, after autumn, no fish were recorded in offshore waters with only a single atherinid species occurring in nearshore waters. This study provides baseline information for these data-poor estuaries and identified one system of high conservation significance. It also provides insights on how estuaries and their fish fauna may change due to reduced rainfall and river flow associated with climate change, and become more like Beaufort Inlet.
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5

Loneragan, Neil Randell. "The populations and community structures of fishes in two large estuaries of south-western Australia." Thesis, Loneragan, Neil Randell (1989) The populations and community structures of fishes in two large estuaries of south-western Australia. PhD thesis, Murdoch University, 1989. https://researchrepository.murdoch.edu.au/id/eprint/11723/.

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The fish fauna of the large and adjacent Swan and Peel-Harvey estuaries in temperate south-western Australia, were sampled at regular intervals using beach seines, gill nets and otter trawls at a number of sites throughout these systems. A total of 673 037 individuals, representing 38 families and 76 species were caught in the Swan Estuary compared with 144 372 individuals, 29 families and 55 species in the PeelHarvey Estuary. Although the Clupeidae, Terapontidae, Mugilidae, Apogonidae and Atherinidae were the most abundant families in each system, the important species within the families differed between the estuaries. Of the 15 most abundant species in the shallows of the Swan Estuary, seven were marine teleosts which entered the estuary regularly and in large numbers (marine estuarine-opportunists), seven completed their life cycle within the estuary (estuarine) and one (Nematalosa vlaminghi) was anadromous. The contribution of individuals of the marine estuarine-opportunist category to catches in the shallows declined from nearly 95% in the lower estuary, to approximately 17% in the middle estuary and 6% in the upper estuary. The estuarine and anadromous groups together comprised 83 and 94% of the catches in the middle and upper estuaries, respectively. By contrast, marine estuarine-opportunists were the most abundant group in all regions of the Peel-Harvey, including the saline reaches of tributary rivers. The number of species and density of fish in the shallows of the Swan and PeelHarvey systems declined with distance from estuary mouth and rose with increasing salinity and temperature. Classification and ordination of the data from the shallows of both estuarine systems distinguished the ichthyofauna of the saline reaches of the rivers from that of the lower reaches of the estuary. However, the faunal composition of the middle estuary of the Swan was also relatively distinct from those of the lower and upper estuary. The number of species and catch rates in the deeper waters of the Peel-Harvey were influenced to a greater extent by salinity, than those in the shallows. This implies that the larger fish which characterise the deeper waters may thus be less tolerant to low salinities than the smaller fish, typically found in the shallows. Site within the Swan Estuary generally influenced the densities of individual species to a greater extent than either season or year, or the interactions between these factors. When seasonal effects were pronounced, they could be related to summer spawning migrations into the upper estuary (N. vlaminghi, Amniataba caudavittatus ), spring immigrations into the lower estuary (Mugil cephalus ) or winter movements into deeper and more saline waters (Apogon rueppellii ). Marked annual variations in the density of Torquigener pleurogramma were related to large differences in the recruitment of the 0+ age class between years.
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6

Qu, Wenchuan. "Studies on nitrogen cycling processes in Lake Illawarra, New South Wales, Australia." Access electronically, 2004. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20050302.161641/index.html.

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7

Wilton, Kylee Margaret, and res cand@acu edu au. "Coastal Wetland Habitat Dynamics in Selected New South Wales Estuaries." Australian Catholic University. School of Arts and Sciences, 2002. http://dlibrary.acu.edu.au/digitaltheses/public/adt-acuvp29.29082005.

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Intertidal wetland habitats in southeastern Australia have changed significantly during the past sixty years. Mangrove habitats have expanded both seawards and landwards, the latter being at the expense of saltmarsh habitats. This relatively common phenomenon is generally suggested to be an outcome of sea-level rise. Several factors potentially responsible for this change are examined, including changes in mean sealevel during the past 50 to 100 years, changes in climate, population growth, catchment landuse, and estuary type. A protocol for mapping estuarine habitats was developed and implemented, incorporating the application of geographic information systems. Spatial and temporal coastal wetland habitat changes at nine sites along the New South Wales coast are illustrated. These habitat dynamics were shown to not correlate between sites. The results demonstrate that sea-level rise in this region cannot solely account for the extent of change during the past sixty years. With the exception of one site (Careel Bay), there have been no correlations between contemporary mean sea-level rise and mangrove incursion of the saltmarsh habitats at the study sites, or with rainfall patterns, at the scale of observation in this study, which was largely decadal. The only correlations determined during this study have been between population growth and coastal wetland habitat dynamics in some sites. In spite of saltmarsh habitat loss being a regional phenomenon, local factors appear to have a profound bearing on the rates of change. Neither contemporary mean sea-level rise, rainfall patterns, estuary type, catchment landuse, catchment natural cover nor population pressure can account solely for the patterns in the spatial and temporal dynamics of the coastal wetlands of New South Wales. It seems apparent that regional factors create preconditions favourable for mangrove incursion, but that localised conditions have been responsible for the extent of these incursions from site to site. That is, despite higher sea-level and greater rainfall, the extent of change has been determined by the unique characteristics of each site. The results have important implications for current estuary management practices in the state of New South Wales. The lack of spatial and temporal trends in coastal wetland habitat dynamics point to the need for management to be conducted on a localised, rather than regional scale. Additionally, anthropogenic influences must be carefully managed, since the extent of mangrove habitat expansion into saltmarsh areas is unlikely to be a natural occurrence.
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8

Sloss, Craig R. "Holocene sea-level change and the aminostratigraphy of wave-dominated barriers estuaries on the southeast coast of Australia." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060306.154507/index.html.

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9

Rose, Thomas H. "Comparisons of the benthic and zooplankton communities in the eutrophic Peel-Harvey and nearby Swan estuaries in south-western Australia." Thesis, Rose, Thomas H. (1994) Comparisons of the benthic and zooplankton communities in the eutrophic Peel-Harvey and nearby Swan estuaries in south-western Australia. PhD thesis, Murdoch University, 1994. https://researchrepository.murdoch.edu.au/id/eprint/51981/.

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The benthic macroinvertebrates and the zooplankton of the shallow (<1.5 m deep) sandy middle regions of the Peel-Harvey Estuary and of the nearby Swan Estuary were sampled seasonally between the winters of 1986 and 1987. Measurements were also taken of the environmental variables in the benthos and in the water column. In comparison with the Swan Estuary, the Peel-Harvey Estuary is highly nutrient enriched and is not as well flushed. As a consequence, the water in the basins of the Peel-Harvey experience large seasonal blooms of the blue-green alga Nodularia spumigena and massive growths of benthic and drifting green algae. The first led to marked seasonal declines in redox values, secchi depths and nocturnal dissolved oxygen and, together with the decomposition of the macroalgae, resulted in a marked increase in particulate organic matter in the sediments. The following comparisons between the benthic invertebrate fauna in the Peel- Harvey with that of the Swan Estuary are consistent with the effects of far greater eutrophication in the former system. (1) The number of individuals was far higher in the Peel-Harvey, whereas the number of species, diversity and biomass was greater in the Swan. (2) The contributions made by small and highly fecund polychaetes (e.g. Capitclla capitata), amphipods (e.g. Corophium minor), tanaids (e.g. Tanais dulongi) and microbivalves (e.g. Arthritica semen) to the numbers and biomass of individuals were much greater in the Peel-Harvey, whereas the contributions by large long-living bivalve molluscs and polychaetes to the numbers and more particularly the biomass of individuals were greater in the Swan. (3) While the densities and biomass of the main components of the benthic community rose to reach a maximum in spring or summer in the Swan Estuary, they peaked in autumn in the Peel-Harvey. The later peak in the latter system is apparently related to deleterious conditions present during spring and early summer, e.g. frequent episodes of hypoxia. Greater variability in the density and biomass of organisms at sites in the Peel-Harvey are assumed to reflect variation in the intensity of deleterious conditions produced by eutrophication within this system. The following comparisons also indicate that the zooplankton community of the Peel-Harvey Estuary manifests the effects of eutrophication to a greater extent than that of the Swan Estuary. (1) The abundance of individuals in the Peel-Harvey was higher than in the Swan whereas the reverse situation pertained with the number of species. (2) The density of calanoids and harpacticoids was far lower in the Peel- Harvey, presumably reflecting the influence of anoxia on their benthic stages. (3) The numbers of amphipods and nematodes were greater in the Peel-Harvey. (4) As with the benthos, the density and biomass of zooplankton varied more between sites in the Peel- Harvey and the density of the main components of the zooplankton peaked later, ie. after the deleterious conditions produced during spring and summer had amehorated. There were also a much higher number of interactions between season and time of day in the density and biomass of the zooplankton and this was attributed to the combination of eutrophication-induced hypoxia and turbidity, which altered migration patterns in comparison to the Swan. The above comparisons thus indicate that there have probably been major changes in the faunal composition of the Peel-Harvey Estuary following eutrophication and particularly the advent of Nodularia blooms since the late 1970s. This view is supported by the fact that, in comparison with the situation during the 1970s and early 1980s, the densities of gastropods in the benthos and of calanoids in the plankton are lower, while the densities of amphipods in both the benthos and zooplankton are greater.
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10

au, rhoddell@central murdoch edu, and Richard James Hoddell. "A mtDNA study of aspects of the recent evolutionary history and phylogeographic structure of selected teleosts in coastal environments of south-western Australia." Murdoch University, 2003. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20070831.162328.

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At present, there is a general lack of information regarding the spatial genetic architecture and genetic diversity of estuarine and coastal freshwater fish in Australia or about the interacting intrinsic, extrinsic and historical influences responsible for sculpting these patterns. This thesis represented the first investigation of the phylogeographic structure and recent evolutionary histories of teleost fishes from the coastal and estuarine environments of south-western Australia, using the resolution afforded by mtDNA sequence data. Available evidence indicated that, to different degrees, these species have limited potential for dispersal amongst local assemblages from different water bodies. As this theoretically reduces the confounding effects of recent gene flow on extant genetic structure, these fishes were well suited to studying the influences of historical factors. Historical influences were expected to be particularly profound, given that these coastal environments underwent massive modifications during Late Quaternary eustatic fluctuations. The thesis consists of four major components, which explored different aspects of interspecific and intraspecific phylogeny and p hylogeograp hy of three teleost species, based on mtDNA control region and cytochrome b fragments. First, the relationship between the endemic, 'strictly estuarine' Leptatherina wallacei (Atherinidae) and the more widespread, 'estuarine & marine' 6. presbyteroides was examined, with a view to establishing whether 6. wallacei represents a monophyletic or polyphyletic lineage and whether this species was derived recently (i.e. in Holocene estuaries). Second, the phylogeographic structure and genetic diversity of L. wallacei were investigated and compared with data from L. presbyteroides, with a view to using this information to interpret the recent evolutionary histories of each congener. Third, the divergence between assemblages of L. wallacei inhabiting two isolated coastal lakes was used to estimate a maximal substitution rate for the control region, which was then used to infer general time frames for the divergence between the two Leptatherina species and between the major phylogeographic partitions within each species. Fourth, investigations were initiated into phylogeographic patterns and levels of genetic diversity within and among assemblages of Pseudogobius olorum (Gobiidae) from several coastal lakes and an estuary. Phylogenetic analyses indicated that the two Leptatherina species were characterised by exclusive and reciprocally-monophyletic lineages of haplotypes from both mtDNA regions, supporting the monophyletic origins of L. wallacei. Both 6. wallacei and 6. presbyteroides exhibited high levels of genetic diversity and extensive overall subdivision (e.g. Qsr = 0.691 & 0.644 respectively for control region data). There was a profound phylogeographic break in both species between all conspecific assemblages from the lower west coast (LWC phylogroup) and all those from the south coast (SC phylogroup), which suggested the influences of shared extrinsic and/or historical factors. There was limited genetic structuring within the two major phylogroups of either Leptatherina species, apparently reflecting recent connectivity amongst local assemblages, with subsequent fragmentation and insufficient time for lineage sorting. However, two major phylogeographic breaks distinguished monophyletic control region phylogroups of L. wallacei from the isolated coastal Lake Clifton and Lake Walyungup, consistent with their independent evolution following lacustrine entrapment during the Holocene. The divergence between these two isolated lacustrine assemblages of Leptatherina wallaceiformed the basis for an estimate of the maximal substitution rate of the control region. While these data were unable to provide a precise estimate of the actual rate of molecular evolution, all the evidence suggested that it was proceeding very rapidly. The maximal rate estimate of 172.3% lineage-' MY-' was among the fastest ever reported. Based on this rate, the two Leptatherina species diverged at least 1 SKya, thus rejecting a Holocene origin for L. wallacei. The divergence between the LWC and SC phylogroups of L. wallacei has been ongoing for at least GKya, while the equivalent divergence in L. presbyteroides has been ongoing for at least 11 Kya. As the time frames of these divergences were consistent with periods of massive environmental modifications associated with the end-Pleistocene fall in sea level and the HMT, it was likely that these factors have played important roles in sculpting the species' divergence and intra-specific genetic structure. Although useful in temporally scaling genetic divergences within and between the two Leptatherina species, wider application of this rate estimate to questions regarding other taxa was limited. For example, evident rate heterogeneity between the genera precluded its use with even the relatively closely-related atherinid Atherinosoma elongafa. Phylogeographic analyses identified high levels of genetic diversity and extensive genetic subdivision (e.g. st = 0.652 for control region) amongst an estuarine and several lacustrine assemblages of Pseudogobius olorum, although phylogeographic structure was shallower than in either Leptatherina species. There was increased divergence between three assemblages from the lower west coast and two from the south coast, consistent with the profound break evident in the Leptatherina. One lacustrine assemblage appeared to represent a distinct lineage and a preliminary maximal rate estimate (~61.4% lineage-1 MY-1) was calculated based on the minimum divergence of this assemblage from its nearest conspecifics. Although slower than the rate calculated for L. wallacei, this was still high for teleost fishes. Overall, this study indicated that historical environmental factors, especially those related to Quaternary eustatic changes, have played important roles in sculpting the phylogeography and evolution of three teleost species from south-western Australia. Moreover, as these species have differential dependencies on estuarine environments (is. 'strictly estuarine' vs 'estuarine & marine') and represented two different taxonomic groups (i.e. Atherinoidei & Gobioidei), historical environmental factors may have exerted similar influences on other coastal species in the region.
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Книги з теми "Estuaries Australia"

1

Wolanski, Eric, ed. Estuaries of Australia in 2050 and beyond. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-7019-5.

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2

Australian Marine Sciences Association. Conference. Catchments to coast: Australian Marine Sciences Association 44th Annual Conference and The Society of Wetland Scientists 27th International Conference ; Cairns Convention Centre, Cairns, Queensland Australia, 9-14 July 2006 ; book of abstracts. [Brisbane, Qld.]: Australian Marine Sciences Association and Society of Wetland Scientists, 2006.

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3

Smith, Timothy F. Australian estuaries: A framework for management. Indooroopilly, Qld: Cooperative Research Centre for Coastal Zone, Estuary and Waterway Management, 2001.

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4

Jennings, G. H. The fishes of the Indian Ocean: The 1998 classified taxonomic checklist : a classified taxonomic checklist of over 1,850 species currently recorded on the Calypso icthyological database of marine & estuarine fish from the Northern, Central and Western Indian Ocean, excluding Australasia, Arabia and the Red Sea. London: Calypso, 1997.

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5

Wolanski, Eric. Estuaries of Australia in 2050 and Beyond. Springer London, Limited, 2013.

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Estuaries Of Australia In 2050 And Beyond. Springer, 2013.

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7

Wolanski, Eric. Estuaries of Australia in 2050 and Beyond. Springer Netherlands, 2015.

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8

Bourman, Robert P. Coastal Landscapes of South Australia. University of Adelaide Press, 2016.

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Humphreys, John, and Sally Little, eds. Challenges in Estuarine and Coastal Science. Pelagic Publishing, 2022. http://dx.doi.org/10.53061/bdix4458.

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Estuarine and coastal waters are acknowledged centres for anthropogenic impacts. Superimposed on the complex natural interactions between land, rivers and sea are the myriad consequences of human activity – a spectrum ranging from locally polluting effluents to some of the severest consequences of global climate change. For practitioners, academics and students in the field of coastal science and policy, this book examines and exemplifies current and future challenges: from upper estuaries to open coasts and adjacent seas; from tropical to temperate latitudes; from Europe to Australia. This authoritative volume marks the 50th anniversary of the Estuarine and Coastal Sciences Association, and contains a prologue by founding member Professor Richard Barnes and a short history of the Association. Individual chapters then address coastal erosion and deposition; open shores to estuaries and deltas; marine plastics; coastal squeeze and habitat loss; tidal freshwaters – saline incursion and estuarine squeeze; restoration management using remote data collection; carbon storage; species distribution and non-natives; shorebirds; Modelling environmental change; physical processes such as sediments and modelling; sea level rise and estuarine tidal dynamics; estuaries as fish nurseries; policy versus reality in coastal conservation; developments in Estuarine, coastal and marine management.
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10

Ernest Hodgkin's Swanland: Estuaries And Coastal Lagoons of South-western Australia. University of Western Australia Press, 2006.

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Частини книг з теми "Estuaries Australia"

1

Wolanski, Eric, and Jean-Paul Ducrotoy. "Estuaries of Australia in 2050 and Beyond – A Synthesis." In Estuaries of the World, 1–13. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7019-5_1.

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2

Dunn, Ryan J. K., Nathan J. Waltham, Nathan P. Benfer, Brian A. King, Charles J. Lemckert, and Sasha Zigic. "Gold Coast Broadwater: Southern Moreton Bay, Southeast Queensland (Australia)." In Estuaries of the World, 93–109. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7019-5_6.

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3

Lee, Serena B., and Gavin F. Birch. "Sydney Estuary, Australia: Geology, Anthropogenic Development and Hydrodynamic Processes/Attributes." In Estuaries of the World, 17–30. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7019-5_2.

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Sheaves, Marcus, Kátya G. Abrantes, and Ross Johnston. "Deluge Inlet, a Pristine Small Tropical Estuary in North-Eastern Australia." In Estuaries of the World, 261–75. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7019-5_15.

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5

Andutta, F. P., X. H. Wang, Li Li, and David Williams. "Hydrodynamics and Sediment Transport in a Macro-tidal Estuary: Darwin Harbour, Australia." In Estuaries of the World, 111–29. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7019-5_7.

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McComb, A. J., and R. J. Lukatelich. "Nutrients and Plant Biomass in Australian Estuaries, with Particular Reference to South-western Australia." In Limnology in Australia, 433–55. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4820-4_27.

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Chanson, Hubert, Badin Gibbes, and Richard J. Brown. "Turbulent Mixing and Sediment Processes in Peri-Urban Estuaries in South-East Queensland (Australia)." In Estuaries of the World, 167–83. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7019-5_10.

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8

Davis, Aaron M., Stephen E. Lewis, Dominique S. O’Brien, Zoë T. Bainbridge, Christie Bentley, Jochen F. Mueller, and Jon E. Brodie. "Water Resource Development and High Value Coastal Wetlands on the Lower Burdekin Floodplain, Australia." In Estuaries of the World, 223–45. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7019-5_13.

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9

Bills, P. J., D. W. F. Standingford, and B. J. Noye. "Modelling oil slick trajectories in Spencer Gulf, South Australia." In Mixing in Estuaries and Coastal Seas, 77–94. Washington, D. C.: American Geophysical Union, 1996. http://dx.doi.org/10.1029/ce050p0077.

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10

Mills, D., N. D. Adamo, A. Wyllie, and A. Pearce. "The response of stratified shelf waters to the Leeuwin Current and wind forcing: Winter observations off Perth, Western Australia." In Mixing in Estuaries and Coastal Seas, 5–28. Washington, D. C.: American Geophysical Union, 1996. http://dx.doi.org/10.1029/ce050p0005.

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Тези доповідей конференцій з теми "Estuaries Australia"

1

Zigic, Sasha, Oleg Makarynskyy, Scott Langtry, and Guy Westbrook. "A Numerical Modelling Study for the Proposed Increase in Barramundi Production, Cone Bay, Western Australia." In 11th International Conference on Estuarine and Coastal Modeling. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41121(388)26.

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2

Hasiotis*, Stephen T., Mark Reilly, Ian Moffat, and Simon C. Lang. "The Neoichnology of the Modern Fluvial and Estuarine Sediments in Moreton Bay, Queensland, Australia: Relationships of Terrestrial, Freshwater and Marine Organisms to Physicochemical Characters of Sedimentary Systems." In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2211572.

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