Predatory Efficiency of Crayfish: Comparison Between Indigenous and Non-Indigenous Species

Renai, B.; Gherardi, Francesca

doi:10.1023/b:binv.0000010126.94675.50

Cited by 70 publications

(54 citation statements)

References 44 publications

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“…In fact, according to Renai and Gherardi (2004), crayfish are able to prey species with fast escape reactions, such as amphibian larvae and trout fry. This ability is related to a "sit and wait" strategy in which the prey does not feel threatened and is eventually caught.…”

Section: Discussionmentioning

confidence: 99%

Interactions between invasive crayfish and native river shrimp

Banha

Anastácio

2011

Knowl. Managt. Aquatic Ecosyst.

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Key-words:interaction, Athyaephyra desmarestii, Procambarus clarkii, predation, habitat use In the south of Portugal there are only two species of strictly freshwater decapods: the native freshwater shrimp Atyaephyra desmarestii and the exotic crayfish Procambarus clarkii. The aim of this study is to understand if the exotic crayfish acts as river shrimp predator and if both species share the same type of microhabitat. We performed laboratory experiments to study predation and conducted field work in the river Sorraia to verify the microhabitat distribution of both species. Laboratory experiments demonstrated significant predation on river shrimp for crayfish with a cephalothorax length (CT) over 24 mm. The average daily consumption increases with crayfish CT to a maximum of 0.8 shrimps at 44 mm. Field work confirmed that both species share the same microhabitats although with small differences e.g. on the water quality variables such as conductivity and the percentage of oxygen saturation. These microhabitats are shallow pools with abundant aquatic vegetation with no preference for the type of substrate. In the field, both crayfish density and its cephalothorax length are negatively correlated with shrimp densities. In conclusion, P. clarkii can predate A. desmarestii and the major impacts are expected at high densities of large sized crayfish. RÉSUMÉ Interactions entre écrevisse invasive et crevette native en rivière Mots-clés :interaction, Athyaephyra desmarestii, Procambarus clarkii, prédation, habitatDans le sud du Portugal, il n'y a que deux espèces de décapodes strictement d'eau douce : la crevette indigène d'eau douce Atyaephyra desmarestii et l'écrevisse exogène Procambarus clarkii. Le but de cette étude est de comprendre si l'écrevisse exogène agit comme prédateur de la crevette et si les deux espèces partagent le même type de microhabitat. Des expériences de laboratoire ont été réalisées pour étudier la prédation et des travaux sur le terrain dans la rivière Sorraia pour vérifier la distribution des microhabitats des deux espèces. Les expé-riences de laboratoire montrent une prédation significative sur la crevette palomète par l'écrevisse dont la longueur du céphalothorax (CT) est supérieure à 24 mm. La consommation moyenne journalière augmente avec la taille CT de l'écrevisse jusqu'à un maximum de 0,8 crevette à 44 mm. Le travail de terrain confirme que les deux espèces partagent les mêmes microhabitats bien qu'avec de petites différences concernant des variables de qualité des eaux comme la conductivité et le pourcentage de saturation en oxygène. Ces microhabitats sont des calmes peu profonds avec une abondante végétation aquatique sans préférence pour le type

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Section: Discussionmentioning

confidence: 99%

Interactions between invasive crayfish and native river shrimp

Banha

Anastácio

2011

Knowl. Managt. Aquatic Ecosyst.

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“…Kelly et al 2002;Fielding et al 2003;Renai and 2005; Bishop and Peterson 2006;Veiga et al 2011; but see Griswold and Lounibos 2005;Twardochleb et al 2012). However, the problem with arbitrarily setting one particular level of prey availability is that, because of its 'snapshot' nature, any differences in predatory impact may be missed as no opportunity is given for functional response types and magnitudes to emerge and perhaps diverge.…”

Section: A Comparative Functional Response Framework For Invasion Ecomentioning

confidence: 99%

Advancing impact prediction and hypothesis testing in invasion ecology using a comparative functional response approach

et al. 2013

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Invasion ecology urgently requires predictive methodologies that can forecast the ecological impacts of existing, emerging and potential invasive species. We argue that many ecologically damaging invaders are characterised by their more efficient use of resources. Consequently, comparison of the classical 'functional response' (relationship between resource use and availability) between invasive and trophically analogous native species may allow prediction of invader ecological impact. We review the utility of species trait comparisons and the history and context of the use of functional responses in invasion ecology, then present our framework for the use of comparative functional responses. We show that functional response analyses, by describing the resource use of species over a range of resource availabilities, avoids many pitfalls of 'snapshot' assessments of resource use. Our framework demonstrates how comparisons of invader and native functional responses, within and between Type II and III functional responses, allow testing of the likely population-level outcomes of invasions for affected species. Furthermore, we describe how recent studies support the predictive capacity of this method; for example, the invasive 'bloody red shrimp' Hemimysis anomala shows higher Type II functional responses than native mysids and this corroborates, and could -013-0550-8 have predicted, actual invader impacts in the field. The comparative functional response method can also be used to examine differences in the impact of two or more invaders, two or more populations of the same invader, and the abiotic (e.g. temperature) and biotic (e.g. parasitism) context-dependencies of invader impacts. Our framework may also address the previous lack of rigour in testing major hypotheses in invasion ecology, such as the 'enemy release' and 'biotic resistance' hypotheses, as our approach explicitly considers demographic consequences for impacted resources, such as native and invasive prey species. We also identify potential challenges in the application of comparative functional responses in invasion ecology. These include incorporation of numerical responses, multiple predator effects and trait-mediated indirect interactions, replacement versus non-replacement study designs and the inclusion of functional responses in risk assessment frameworks. In future, the generation of sufficient case studies for a meta-analysis could test the overall hypothesis that comparative functional responses can indeed predict invasive species impacts.Biol Invasions (2014) 16:735-753 DOI 10.1007/s10530

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“…While there is some evidence for sex-dependent feeding patterns for crayfish in the wild , most studies report no dietary differences due to sex (e.g. Renai and Gherardi, 2004;Reynolds and O'Keeffe, 2005;Stenroth et al, 2008). Pools were checked weekly for crayfish mortalities and evidence of moult.…”

Section: > Experimental Designmentioning

confidence: 99%

Size-dependent impacts of the endangered white-clawed crayfish (Austropotamobius pallipes) (Lereboullet) on the littoral community

Rosewarne

Mortimer

Dunn

2013

Knowl. Managt. Aquatic Ecosyst.

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Key-words:crayfish, mesocosm, ontogenic diet-shift, Austropotamobius pallipes, conservationThe demise of Britain's only native crayfish (Austropotamobius pallipes (Lereboullet)) has prompted conservation-led translocations to safe isolated stillwaters (Ark sites). Many translocations represent introductions rather than re-stocking; hence it is important to ensure that there will not be a detrimental impact on communities already present. Current knowledge is insufficient to predict likely effects, although gut contents analyses suggest that A. pallipes is omnivorous and exhibits ontogenic diet shifts. A mesocosm study was conducted with the aim to first, determine community impacts of introducing A. pallipes on the benthic invertebrate community, and second investigate if impacts vary with crayfish life-stage. All crayfish life-stages strongly reduced shredder and grazer abundance, particularly thin-shelled Lymnaea snails. The small snail Physa fontinalis was preferentially consumed by juveniles, perhaps reflecting different preyhandling ability. Adults showed greater reliance on terrestrially derived detritus compared to juveniles. There were limited effects on other trophic levels, although by reducing shredders that process basal resources, crayfish impacts may be felt through the community in the long-term. RÉSUMÉImpacts dépendant de la taille de l'écrevisse à pattes blanches (Austropotamobius pallipes) (Lereboullet) sur la communauté littorale Mots-clés :écrevisse, mésocosmes, changement ontogénique de régime, Austropotamobius pallipes, conservation L'effondrement en Grande-Bretagne de la seule espèce indigène d'écrevisse Austropotamobius pallipes (Lereboullet) a incité les transferts à but de conservation dans des milieux aquatiques isolés et sûrs (sites Ark). De nombreuses translocations représentent des introductions plutôt que la reconstitution de stocks, et il est important de s'assurer qu'il n'y aura pas un impact négatif sur les communautés déjà présentes. Les connaissances actuelles sont insuffisantes pour prévoir les effets probables, bien que les analyses des contenus stomacaux suggèrent que A. pallipes est omnivore et présente des changements ontogéniques de régime. Une étude en mésocosmes a été menée dans le but d'abord, de déterminer les impacts de l'introduction d'A. pallipes sur la communauté d'invertébrés benthiques, puis d'étudier si les effets varient en fonction du stade de vie des écrevisses. Tous les stades de vie de l'écrevisse ont fortement réduit l'abondance des déchique-teurs et des brouteurs, en particulier les escargots Lymnaea à coquilles minces. Le petit escargot Physa fontinalis a été préférentiellement consommé par les jeunes,

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Predatory Efficiency of Crayfish: Comparison Between Indigenous and Non-Indigenous Species

Cited by 70 publications

References 44 publications

Interactions between invasive crayfish and native river shrimp

Interactions between invasive crayfish and native river shrimp

Advancing impact prediction and hypothesis testing in invasion ecology using a comparative functional response approach

Size-dependent impacts of the endangered white-clawed crayfish (Austropotamobius pallipes) (Lereboullet) on the littoral community

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