Can intensive trapping to reduce the abundance of an invasive crayfish benefit an imperiled congener?

Management aimed at reducing the population sizes of established invasive species can be beneficial for the conservation of native species. Crayfish are some of the most widespread and impactful invasive species in freshwater ecosystems. This study evaluated the efficacy of intensive baited trapping...

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Veröffentlicht in:Aquatic conservation 2024-03, Vol.34 (3), p.n/a
Hauptverfasser: Reisinger, Lindsey, Tripp, Nicole, Atchia, Alison, Bolds, Sara, Cook, David, Fralick, Kasey, Ganas, Danielle, Hayman, Blair
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container_issue 3
container_start_page
container_title Aquatic conservation
container_volume 34
creator Reisinger, Lindsey
Tripp, Nicole
Atchia, Alison
Bolds, Sara
Cook, David
Fralick, Kasey
Ganas, Danielle
Hayman, Blair
description Management aimed at reducing the population sizes of established invasive species can be beneficial for the conservation of native species. Crayfish are some of the most widespread and impactful invasive species in freshwater ecosystems. This study evaluated the efficacy of intensive baited trapping as a tool to reduce the abundance of an invasive crayfish (Procambarus spiculifer) in small streams and benefit an imperiled congener (Procambarus pictus). The invasive crayfish was captured and removed from a 1‐km stream reach through three rounds of intensive trapping conducted over a 16‐month period. The abundance of the invasive species declined significantly in the trapping reach after the initial round of trapping. Throughout the year following the onset of trapping, its abundance within the trapping reach was less than half of that at control sites. The sex ratio of invasive crayfish collected in traps was approximately 1:1, and 31% of captured individuals were likely to be immature based on size class. The abundance of the imperiled species did not change significantly over the study period, but 1 year may not be long enough to detect a response. Overall, the data suggest that periodic intensive trapping can effectively reduce the abundance of this invasive crayfish in small streams, and the extent to which this benefits the imperiled species remains an open question. Future research examining how trapping can best be applied to achieve lasting effects (including trap type, season and barriers to immigration) would be valuable for understanding the conservation potential of this management technique.
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Crayfish are some of the most widespread and impactful invasive species in freshwater ecosystems. This study evaluated the efficacy of intensive baited trapping as a tool to reduce the abundance of an invasive crayfish (Procambarus spiculifer) in small streams and benefit an imperiled congener (Procambarus pictus). The invasive crayfish was captured and removed from a 1‐km stream reach through three rounds of intensive trapping conducted over a 16‐month period. The abundance of the invasive species declined significantly in the trapping reach after the initial round of trapping. Throughout the year following the onset of trapping, its abundance within the trapping reach was less than half of that at control sites. The sex ratio of invasive crayfish collected in traps was approximately 1:1, and 31% of captured individuals were likely to be immature based on size class. 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subjects Abundance
Aquatic ecosystems
Congeners
Conservation
Crayfish
Freshwater
Freshwater crustaceans
Freshwater ecosystems
Immigration
Indigenous species
Inland water environment
Introduced species
invasive
Invasive species
management
mechanical removal
native
Native organisms
Nonnative species
Population decline
Rivers
sex
Sex ratio
size
Streams
threatened
trap
Trapping
title Can intensive trapping to reduce the abundance of an invasive crayfish benefit an imperiled congener?
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