Habitat use by the endangered white-clawed crayfish<i>Austropotamobius</i>species complex: a systematic review

Rosewarne, Paula J.; Mortimer, Robert J.G.; Dunn, Alison M.

doi:10.1051/kmae/2016036

Cited by 9 publications

(9 citation statements)

References 47 publications

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“…Hence, such a high number of negative localities was expected, given that level of anthropogenic pressure is inversely proportional to crayfish presence (Fratini et al, 2005;Füreder et al, 2006;Weinländer et al, 2014;Chucholl and Schrimpf, 2016;Rosewarne et al, 2017). Indeed, in 61% of negative localities habitat conditions had been altered by intensive agriculture, waterbody engineering, direct municipal waste water influx, tourism, etc., while in 1%, NICS, as potential crayfish plague vectors, were recorded.…”

Section: Discussionmentioning

confidence: 99%

Recent changes in distribution pattern of freshwater crayfish in Croatia − threats and perspectives

Maguire

Klobučar

Žganec

et al. 2018

Knowl. Manag. Aquat. Ecosyst.

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-Analysis of Croatian freshwater crayfish populations, aiming to gather new distributional data and complement previous surveys (2005)(2006)(2007)(2008)(2009)(2010)(2011), was performed during 2014-2016, within the frame of Natura 2000 Integration Project. The research included different waterbodies across the whole of Croatia, harbouring both indigenous and non-indigenous crayfish species (ICS and NICS, respectively). Field work was conducted in 117 grid squares with dimensions 10 Â 10 km, and up to four waterbodies were surveyed per grid square, making a total of 450 studied sites. Out of those, crayfish were not recorded in 368 sites. In the sites with crayfish presence (i.e., 82), the most frequently observed ICS was Astacus astacus (registered in 33 sites) followed by Austropotamobius pallipes (16 sites), Austropotamobius torrentium (12 sites), and Astacus leptodactylus (5 sites). Concerning NICS, the majority of records were for Orconectes limosus (13 sites), followed by Pacifastacus leniusculus (2 sites), whereas Procambarus fallax f. virginalis was registered in only one locality. Comparisons of obtained data with those from previous surveys showed that NICS are progressively spreading and displacing ICS, as recorded for A. leptodactylus that was almost completely displaced by O. limosus in waterbodies of the east Croatia. Existing ICS populations are under growing anthropogenic preassure, frequently fragmented and isolated. Moreover, this survey showed that in the last decade 55% of A. astacus and 67% of A. pallipes populations disappeared mainly as a consequence of anthropogenic influence onto their habitats. Further monitoring and conservation actions for ICS should be urgently applied to mitigate negative impacts of both NICS and anthropogenic influence. (ICS et NICS, respectivement). Le travail sur le terrain a été effectué dans un quadrillage de 117 quadrats de dimensions 10 Â 10 km, et jusqu' à quatre plans d'eau ont été étudiés par quadrat, ce qui fait un total de 450 sites étudiés. Parmi ceux-ci, les écrevisses n'ont pas été recensées dans 368 sites. Dans les sites où il y avait des écrevisses (c. -à-d. 82), l'ICS le plus fréquemment observé était Astacus astacus (enregistré dans 33 sites), suivi de Austropotamobius pallipes (16 sites), Austropotamobius torrentium (12 sites) et Astacus leptodactylus (5 sites). En ce qui concerne le NICS, la majorité des signalements concernaient Orconectes limosus (13 sites), suivi de Pacifastacus leniusculus (2 sites), tandis que Procambarus fallax f. virginalis n' a été enregistrée que dans une seule localité. Les comparaisons des données obtenues avec celles des enquêtes précédentes ont montré que les NICS se répandent et déplacent progressivement les ICS, comme cela a été enregistré pour A. leptodactylus qui a été presque complètement déplacé par O. limosus dans les masses d'eau de l'est de la Croatie. Les populations actuelles d'ICS sont de plus en plus souvent exposées à une pression anthropique croissante, fragmentées et isolées. En outre, cett...

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Section: Discussionmentioning

confidence: 99%

Recent changes in distribution pattern of freshwater crayfish in Croatia − threats and perspectives

Maguire

Klobučar

Žganec

et al. 2018

Knowl. Manag. Aquat. Ecosyst.

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“…Our results suggest that the communication campaigns addressed to stakeholders and the natural separation of the stream from environments inhabited by alien crayfish species should allow the success of the reintroduction action, with a complete recovery of the species. Even though the study site can be considered a typical ark site, i.e., a refuge site safe from nonnative crayfish and crayfish plague (Kozák et al, 2011;Haddaway et al, 2012;Rosewarne et al, 2017), major concerns remain for the long-term persistence of this population. For instance, long-term isolation could expose the population to the risk of extinction because of stochastic or genetic factors.…”

Section: Discussionmentioning

confidence: 99%

Not Only Environmental Conditions but Also Human Awareness Matters: A Successful Post-Crayfish Plague Reintroduction of the White-Clawed Crayfish (Austropotamobius pallipes) in Northern Italy

et al. 2021

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In Europe, invasive freshwater crayfish are not only changing freshwater ecosystems, but they are also leading to local extinctions of native freshwater crayfish. This is particularly evident for the populations of red swamp crayfish and spiny-cheek crayfish in northern Italy, which are threatening the last and isolated populations of the white-clawed crayfish. Here, we describe the steps that accompanied a successful reintroduction of the white-clawed crayfish in an Italian stream (Park Monte Barro) that, although isolated from other freshwater sites, suffered from an illegal introduction of the spiny-cheek crayfish in 2013. After the removal of presumably all the introduced spiny-cheek crayfish individuals, we started periodical surveys (twice a year) of the stream to confirm the absence of further introductions and to monitor environmental conditions. Prior to the reintroduction of the white-clawed crayfish that started in autumn 2018, we developed an intense dissemination activity to raise awareness of white-clawed crayfish features and importance among landowners surrounding the stream, including those suspected of the introduction of the spiny-cheek crayfish: we organized public meetings and we performed seven direct visits, house to house, to the local people providing information on good practices for white-clawed crayfish conservation. From 2018 to 2020, every autumn, we reintroduced a batch of 3-month-old white-clawed crayfish juveniles, and we developed a program for the monitoring of crayfish growth and density, water quality, and direct landowners’ disturbance of the site. We detected a significant increase of the white-clawed crayfish total length (TL) from the first reintroduction (October 2018) to June 2020. In 2020, crayfish were consistently larger than in the 2019 surveys; some of them were able to breed less than 2 years after the first reintroduction. In 2020, the estimated density of large crayfish reached 0.57 individuals/m2, which is lower than the density observed prior to extinction. We did not detect any case of human disturbance of the site. Our results underline that the reintroduction actions could be more effective when the stakeholders having the greatest potential impact on the species are identified, informed, and involved as primary caretakers of the activities.

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“…Crayfish show a strong association with in‐channel substrate, and habitat features that provide shelter like boulder substrates positively correlate with crayfish presence (Rosewarne et al., 2017). The success of PTs in sampling crayfish populations in the surveyed headwater streams is therefore likely also related to abundant in‐channel rocky substrate.…”

Section: Discussionmentioning

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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Habitat use by the endangered white-clawed crayfishAustropotamobiusspecies complex: a systematic review

Cited by 9 publications

References 47 publications

Recent changes in distribution pattern of freshwater crayfish in Croatia − threats and perspectives

Recent changes in distribution pattern of freshwater crayfish in Croatia − threats and perspectives

Not Only Environmental Conditions but Also Human Awareness Matters: A Successful Post-Crayfish Plague Reintroduction of the White-Clawed Crayfish (Austropotamobius pallipes) in Northern Italy

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

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