The ‘Pritchard Trap’: A novel quantitative survey method for crayfish

Abstract As crayfish invasions continue to threaten native freshwater biota, a detailed understanding of crayfish distribution and population structure becomes imperative. Nonetheless, most current survey methods provide inadequate demographic data. The quantitative ‘Triple Drawdown’ (TDD) dewaterin...

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Autores principales:	Eleri G. Pritchard, Daniel D. A. Chadwick, Ian R. Patmore, Michael A. Chadwick, Paul Bradley, Carl D. Sayer, Jan C. Axmacher
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	crayfish density crayfish sampling population demographics signal crayfish triple drawdown white‐clawed crayfish Environmental sciences GE1-350 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/d73424b5c6714052980ed777601ae2c3
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spelling	oai:doaj.org-article:d73424b5c6714052980ed777601ae2c32021-11-16T08:30:39ZThe ‘Pritchard Trap’: A novel quantitative survey method for crayfish2688-831910.1002/2688-8319.12070https://doaj.org/article/d73424b5c6714052980ed777601ae2c32021-04-01T00:00:00Zhttps://doi.org/10.1002/2688-8319.12070https://doaj.org/toc/2688-8319Abstract As crayfish invasions continue to threaten native freshwater biota, a detailed understanding of crayfish distribution and population structure becomes imperative. Nonetheless, most current survey methods provide inadequate demographic data. The quantitative ‘Triple Drawdown’ (TDD) dewatering method has highlighted the importance of such data, yet practical constraints prevent its large‐scale application. Here, we introduce the ‘Pritchard Trap’, a novel passive sampling method that reliably generates quantitative crayfish population data while requiring substantially lower sampling effort than TDDs. This quadrat‐style sampler was extensively tested in headwater streams of North Yorkshire, England, along an invasion gradient for signal crayfish (Pacifastacus leniusculus) from well‐established sites to mixed populations of signal crayfish and native white‐clawed crayfish (Austropotamobius pallipes). The Pritchard Trap was trialled over several time intervals to determine the minimum required trap deployment time. TDDs at the same sites allowed for a robust evaluation of Pritchard Trap sampling accuracy in representing crayfish densities and population structure. The Pritchard Trap successfully sampled both invasive and native crayfish (8–42 mm carapace length). A minimum passive deployment time of 4 days was required. At low crayfish densities (0.5 individuals m−2), increased trapping effort was necessary to achieve accurate population density and size class distribution estimates. The Pritchard Trap required substantially less sampling effort (working hours) and resources than the TDD, whilst also posing less risk to non‐target species. The Pritchard Trap, for the first time, affords logistically simple, truly quantitative investigations of crayfish population demographics for headwater systems. It could be integrated into crayfish research and management, for example to explore density‐dependent ecological impacts of invasive crayfish and their management responses or to monitor populations and recruitment in native crayfish conservation initiatives.Eleri G. PritchardDaniel D. A. ChadwickIan R. PatmoreMichael A. ChadwickPaul BradleyCarl D. SayerJan C. AxmacherWileyarticlecrayfish densitycrayfish samplingpopulation demographicssignal crayfishtriple drawdownwhite‐clawed crayfishEnvironmental sciencesGE1-350EcologyQH540-549.5ENEcological Solutions and Evidence, Vol 2, Iss 2, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	crayfish density crayfish sampling population demographics signal crayfish triple drawdown white‐clawed crayfish Environmental sciences GE1-350 Ecology QH540-549.5
spellingShingle	crayfish density crayfish sampling population demographics signal crayfish triple drawdown white‐clawed crayfish Environmental sciences GE1-350 Ecology QH540-549.5 Eleri G. Pritchard Daniel D. A. Chadwick Ian R. Patmore Michael A. Chadwick Paul Bradley Carl D. Sayer Jan C. Axmacher The ‘Pritchard Trap’: A novel quantitative survey method for crayfish
description	Abstract As crayfish invasions continue to threaten native freshwater biota, a detailed understanding of crayfish distribution and population structure becomes imperative. Nonetheless, most current survey methods provide inadequate demographic data. The quantitative ‘Triple Drawdown’ (TDD) dewatering method has highlighted the importance of such data, yet practical constraints prevent its large‐scale application. Here, we introduce the ‘Pritchard Trap’, a novel passive sampling method that reliably generates quantitative crayfish population data while requiring substantially lower sampling effort than TDDs. This quadrat‐style sampler was extensively tested in headwater streams of North Yorkshire, England, along an invasion gradient for signal crayfish (Pacifastacus leniusculus) from well‐established sites to mixed populations of signal crayfish and native white‐clawed crayfish (Austropotamobius pallipes). The Pritchard Trap was trialled over several time intervals to determine the minimum required trap deployment time. TDDs at the same sites allowed for a robust evaluation of Pritchard Trap sampling accuracy in representing crayfish densities and population structure. The Pritchard Trap successfully sampled both invasive and native crayfish (8–42 mm carapace length). A minimum passive deployment time of 4 days was required. At low crayfish densities (0.5 individuals m−2), increased trapping effort was necessary to achieve accurate population density and size class distribution estimates. The Pritchard Trap required substantially less sampling effort (working hours) and resources than the TDD, whilst also posing less risk to non‐target species. The Pritchard Trap, for the first time, affords logistically simple, truly quantitative investigations of crayfish population demographics for headwater systems. It could be integrated into crayfish research and management, for example to explore density‐dependent ecological impacts of invasive crayfish and their management responses or to monitor populations and recruitment in native crayfish conservation initiatives.
format	article
author	Eleri G. Pritchard Daniel D. A. Chadwick Ian R. Patmore Michael A. Chadwick Paul Bradley Carl D. Sayer Jan C. Axmacher
author_facet	Eleri G. Pritchard Daniel D. A. Chadwick Ian R. Patmore Michael A. Chadwick Paul Bradley Carl D. Sayer Jan C. Axmacher
author_sort	Eleri G. Pritchard
title	The ‘Pritchard Trap’: A novel quantitative survey method for crayfish
title_short	The ‘Pritchard Trap’: A novel quantitative survey method for crayfish
title_full	The ‘Pritchard Trap’: A novel quantitative survey method for crayfish
title_fullStr	The ‘Pritchard Trap’: A novel quantitative survey method for crayfish
title_full_unstemmed	The ‘Pritchard Trap’: A novel quantitative survey method for crayfish
title_sort	‘pritchard trap’: a novel quantitative survey method for crayfish
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/d73424b5c6714052980ed777601ae2c3
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The ‘Pritchard Trap’: A novel quantitative survey method for crayfish

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