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Comparing five methods for quantifying abundance and diversity of fish assemblages in seagrass habitat

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dc.contributor University Of Western Australia
dc.contributor Univ Western Australia
dc.contributor Oceans Inst
dc.contributor Australian Inst Marine Sci
dc.contributor Dept Biodivers Conservat & Attract
dc.contributor Marine Sci Program
dc.contributor Australian Institute Of Marine Science
dc.contributor Biodivers & Conservat Sci RYAN, NICOLE FRENCH, BEN WILSON, SHAUN HOLMES, THOMAS KENDRICK, ALAN RULE, MICHAEL 2021-04-11T19:00:59Z 2021-04-11T19:00:59Z 2021-04-19T05:26:22Z 2021-04-11T19:00:59Z 2021-04-11T19:00:59Z 2021-04-19T05:26:22Z 2021-05-01
dc.identifier.citation French B, Wilson S, Holmes T, Kendrick A, Rule M, Ryan N (2021) Comparing five methods for quantifying abundance and diversity of fish assemblages in seagrass habitat. Ecological Indicators 124:107415
dc.identifier.issn 1470-160X
dc.description.abstract Seagrass fishes perform key ecological roles and are a critical component of many of the world's fisheries. A sound understanding of seagrass fish communities, based on robust methods, is therefore integral for their successful environmental management and conservation. Here we quantitatively compare taxa and size class of seagrass fish assemblages collected using; baited and unbaited remote underwater video (BRUV, URUV), diver operated video (DOV), underwater visual census (UVC) and trawling. We assess comparisons of these methods in terms of biodiversity indicators and power to detect change. All five methods were deployed in coastal embayments dominated by Posidonia spp. and within three marine parks along the south-western coast of Western Australia. Fish assemblages recorded using the different methods separated into two distinct groups; those dominated by smaller and less motile species, that are typically present beneath the canopy among seagrass leaves; and those dominated by larger, faster swimming species present above the seagrass canopy. Trawling provided the most effective method for assessing species within the canopy, including those of conservation concern. Conversely, BRUV followed by URUV recorded the greatest number of individuals, successfully detecting the larger supra-canopy and highly motile species typically omitted by trawling. Both trawl and BRUV methods had a higher power to detect change in species richness of seagrass fishes compared to other methods, even though each method recorded different components of the fish assemblage. Fish assemblages recorded using UVC detected both inter and supra-canopy species, but fish abundances recorded by this method were low compared to trawl and BRUV surveys, resulting in reduced power to detect change in richness. DOV was a comparatively less effective method, recording few fish, as well as low richness and diversity values. The combination of trawling and stationary video techniques, particularly BRUV, provided a two-method combination able to holistically measure commonly used indicators of fish assemblage composition in seagrass habitat. These results demonstrate that careful consideration of the methodology is essential when assessing ichthyofauna in seagrass habitat, particularly when only a single method can be employed. As the extent of methodological influence on recording fish assemblages also varied among the three survey areas, geographical differences in the structure of fish and seagrass communities should be considered when selecting an appropriate sampling method.
dc.description.sponsorship We thank Matt Dasey, Fiona Graham, Dave Lierich and Ian Anderson for support and logistics, Caprice Hyde, Sharlene Grittner, Georgia Nester, James Shepherd, Tanika Shalders and Ellen D'Cruz for technical and laboratory support. This project was funded by the Western Australian Department of Biodiversity Conservation and Attractions. Work was conducted under DBCA permit number SC001467 and Department of Fisheries permit number 2526.
dc.language English
dc.subject Biodiversity & Conservation
dc.subject Methodological Comparison
dc.subject Environmental Sciences
dc.subject Environmental Sciences & Ecology
dc.subject Monitoring Fish
dc.subject Stereo-video
dc.subject Seagrass Communities
dc.subject Biodiversity Conservation
dc.subject Trawling
dc.title Comparing five methods for quantifying abundance and diversity of fish assemblages in seagrass habitat
dc.type journal article
dc.identifier.doi 10.1016/j.ecolind.2021.107415
dc.identifier.wos WOS:000624332200002

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