Traps and netting, better together than alone: an innovative approach to improve <i>Procambarus clarkii</i> management

García-de-Lomas, Juan; Dana, Elías D.; González, Rubén

doi:10.1051/kmae/2020031

Cited by 2 publications

(1 citation statement)

References 40 publications

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“…Their low cost, ease of use and suitability across a wide range of habitats make traps generally a convenient tool for basic survey and management. However, standard trap samples are biased towards large (≥35 mm carapace length CL), active males (Chadwick et al., 2021; García‐De‐Lomas et al., 2020; Gherardi et al., 2011), generating semi‐quantitative catch‐per‐unit‐effort abundance estimates limited to large size classes.…”

Section: Introductionmentioning

confidence: 99%

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

Pritchard

Chadwick

Patmore

et al. 2021

Ecol Sol and Evidence

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1. 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.2. 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).3. 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. 4. 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.5. 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 managementThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Introductionmentioning

confidence: 99%

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

Pritchard

Chadwick

Patmore

et al. 2021

Ecol Sol and Evidence

View full text Add to dashboard Cite

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Are long-term biomonitoring efforts overlooking crayfish in European rivers?

Haubrock,

Soto,

Kurtul

et al. 2024

Environ Sci Eur

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Background Long-term biomonitoring of macroinvertebrates is a popular and valuable approach for assessing the status of freshwater ecosystems, identifying the impact of stressors, and evaluating ecosystem health. Although macroinvertebrate-based biomonitoring can be effective in detecting changes in distribution patterns and community trends over time, crayfish often remain undetected or unreported by biomonitoring efforts despite their importance in maintaining the functioning of aquatic ecosystems. Results By analyzing a comprehensive database of long-term macroinvertebrate time series, we found that most sampling methods and assessment schemes can detect both native and non-native crayfish in running waters if sites are continuously sampled. However, native crayfish were detected to a lesser extent and by fewer methods. Kick-net sampling and assessment techniques prevailed as the most efficient methods for capturing crayfish. However, the substantial number of time series lacking crayfish data calls into question whether these methods are sufficiently comprehensive to encapsulate crayfish populations accurately. The use of other targeted methods such as baited traps or hand catching may provide a more reliable estimate of their presence. Conclusions Given the detrimental impacts of non-native crayfish and the decline in native crayfish populations, we strongly recommend that stakeholders and managers incorporate a combination of these approaches into their monitoring efforts. The use of different taxonomic levels (family vs. genus vs. species level) in estimating biological indices and biomonitoring tools can cause delays in identifying new non-native specie’s occurrences, hindering effective water quality assessment and ecosystem management by governments and stakeholders. Therefore, whenever possible, we call for standardized taxonomic levels for biomonitoring studies and management strategies to accurately address these issues and make recommendations going forward.

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Traps and netting, better together than alone: an innovative approach to improve Procambarus clarkii management

Cited by 2 publications

References 40 publications

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

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

Are long-term biomonitoring efforts overlooking crayfish in European rivers?

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