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Evaluating detectability of freshwater fish assemblages in tropical streams : is hand-seining sufficient?

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Deacon_et_al_2017_Environmental_Biology_of_Fishes_CC.pdf (865.2Kb)
Date
07/2017
Author
Deacon, A.
Mahabir, Rajindra
Inderlall, Devan
Ramnarine, Indar W.
Magurran, Anne E.
Funder
The Royal Society
European Research Council
Grant ID
WM110141
250189
Keywords
Trinidad
Electrofishing
Alpha diversity
Detectability
Species richness
Sampling methods
Gear bias
QH301 Biology
SH Aquaculture. Fisheries. Angling
NDAS
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Abstract
Unprecedented threats to natural ecosystems mean that accurate quantification of biodiversity is a priority, particularly in the tropics which are underrepresented in monitoring schemes. Data from a freshwater fish assemblage in Trinidad were used to evaluate the effectiveness of hand-seining as a survey method in tropical streams. We uncovered large differences in species detectability when hand-seining was used alone, in comparison with when hand-seining and electrofishing were used together. The addition of electrofishing increased the number of individuals caught threefold, and increased the biomass fivefold. Some species were never detected using hand-seining, resulting in significant underestimates of species richness; rarefaction curves suggest that even when hand-seining effort increases, species richness is still underestimated. Diversity indices (Shannon and Simpson index) reveal that diversity was also significantly lower for hand-seined samples. Furthermore, the results of multivariate analyses investigating assemblage structure also differed significantly depending on whether they were based on hand-seined data alone, or a combination of hand-seining and electrofishing. Despite the extra equipment and maintenance required, these findings underline the value of including electrofishing when sampling tropical freshwater streams.
Citation
Deacon , A , Mahabir , R , Inderlall , D , Ramnarine , I W & Magurran , A E 2017 , ' Evaluating detectability of freshwater fish assemblages in tropical streams : is hand-seining sufficient? ' , Environmental Biology of Fishes , vol. 100 , no. 7 , pp. 839-849 . https://doi.org/10.1007/s10641-017-0610-5
Publication
Environmental Biology of Fishes
Status
Peer reviewed
DOI
https://doi.org/10.1007/s10641-017-0610-5
ISSN
0378-1909
Type
Journal article
Rights
© The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Description
This work was funded by a European Research Council grant (BIOTIME 250189). AEM also acknowledges the Royal Society.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/10899

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