Drivers of benthic invertebrate diversity in the protected Walpole-Nornalup Estuary, southwest Australia

A changing climate combined with increasing human development and pollution along riparian areas result in cumulative pressures that alter fauna distribution and diversity in estuaries. One of the very few southwest estuaries in Australia that supports high biological diversity is the protected Walp...

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Vydáno v:Biodiversity and conservation Ročník 34; číslo 4; s. 1449 - 1469
Hlavní autoři: Leal, Inês, Rule, Michael J., Lavery, Paul S., Wilson, Shaun K.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Dordrecht Springer Netherlands 01.03.2025
Springer Nature B.V
Témata:
Abundance
Amphipoda
Aquatic crustaceans
Australia
Benthic fauna
Benthos
Biodiversity
Biomedical and Life Sciences
Bivalvia
climate
Climate change
Climate Change/Climate Change Impacts
Community composition
community structure
Conservation Biology/Ecology
Dissolved oxygen
Distribution patterns
Ecology
Environmental changes
Estuaries
Estuarine dynamics
family
Fauna
human development
Inlets
Inlets (topography)
Inlets (waterways)
Invertebrates
Life Sciences
Marine invertebrates
Marine parks
Mollusks
Original Research
oxygen
pollution
Polychaeta
rain
Rainfall
salinity
Seasonal variation
Sediment
Sediments
Shellfish
species
Zoobenthos
Australia
Western Australia
Estuarine systems
Invertebrates
Benthic communities
Marine parks
ISSN:0960-3115, 1572-9710
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Shrnutí:A changing climate combined with increasing human development and pollution along riparian areas result in cumulative pressures that alter fauna distribution and diversity in estuaries. One of the very few southwest estuaries in Australia that supports high biological diversity is the protected Walpole-Nornalup Estuary. However, little is known of how fauna varies spatially and temporally in response to the local seasonal cycles, information that is essential to benchmark fauna condition and vulnerability. Accordingly, this study aimed to characterize the invertebrate assemblages among the main benthic habitats of varying sediment type in the inlets and discern the suite of environmental variables that drives their richness and abundance. Sampling was done seasonally from 2010 to 2012, with a total of 18,176 organisms from 77 species across 51 taxonomic families being recorded. Polychaete worms, malacostracans and bivalves comprised over 90% of the benthic invertebrate community. Polychaetes not only dominated in terms of abundance but were also the most diverse group with the highest family richness recorded (19 families). Sediment type was one of the greatest determinants of community composition, with more invertebrates and taxa found within sandy sediments at the oceanic opening and shallow peripheral banks of the estuary, compared to the inner muddy basins. Localized levels of pH, dissolved oxygen and salinity, along with broader climatic drivers, such as rainfall, influenced the abundance of specific families, including nereidid, spionid, orbiniid and opheliid worms, aorid amphipods and psammobiid bivalves. These results indicate that environmental change may affect the distribution patterns and diversity of invertebrate assemblages within this marine park and management approaches should consider the response of these sensitive macrobenthic fauna.
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ISSN:0960-3115
1572-9710
DOI:10.1007/s10531-025-03028-7