Molt and gastroliths in<i>Austropotamobius pallipes</i>(Lereboullet, 1858)

Scalici, Massimiliano; Gibertini, Giancarlo

doi:10.1051/kmae/2010006

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…In the present study only six percent of all sampled crayfish were soft and postmoult (i.e. recently moulted) based on the criteria of Scalici & Gibertini (2009). Accordingly, consumption of exuviae may lead to a small overestimation in overall cannibalism prevalence but is unlikely to create the relationship between density and cannibalism observed in the data ( Wutz & Geist (2013) found that habitat preference in Pacifastacus leniusculus was linked to individual size; smaller animals selecting shallower, gravel dominated habitat and larger animals selecting deeper water with substrate of a finer grain size.…”

Section: Discussionmentioning

confidence: 70%

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Size-mediated, density-dependent cannibalism in the signal crayfish Pacifastacus leniusculus (Dana, 1852) (Decapoda, Astacidea), an invasive crayfish in Britain

Houghton

Wood

Lambin

2017

Crustac

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The role of cannibalism in crayfish populations is not well understood, despite being a potentially key density-dependent process underpinning population dynamics. We studied the incidence of cannibalism in an introduced signal crayfish Pacifastacus leniusculus population in a Scottish lowland river in September 2014. Animals were sampled using six different sampling techniques simultaneously, revealing variable densities and size distributions across the site. Cannibalism prevalence was estimated by analysing the gut contents of crayfish >20 mm CL for the presence of crayfish fragments, which was found to be 20% of dissected individuals. When seeking evidence of relationships between the sizes of cannibals and ‘prey’, the density of conspecifics <56% the size of a dissected individual yielded the best fit. The relationship between cannibalism probability and crayfish size and density was equally well described by three different metrics of crayfish density. Cannibalism increased with crayfish size and density but did not vary according to sex. These results suggest that large P. leniusculus frequently cannibalize smaller (prey) conspecifics, and that the probability of cannibalism is dependent upon the relative size of cannibal-to-prey and the density of the smaller crayfish. We suggest that removing large individuals, as targeted by many traditional removal techniques, may lead to reduced cannibalism and therefore a compensatory increase in juvenile survival.

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Section: Discussionmentioning

confidence: 70%

“…Field sampling was conducted at the end of the growth season, when moulting was infrequent. To quantify moulting incidence, prior to freezing, every individual was categorised as being pre-moult, moulting, post-moult or inter-moult using the method outlined by Scalici & Gibertini (2009).…”

Section: Analysis Of Gut Contentsmentioning

confidence: 99%

Size-mediated, density-dependent cannibalism in the signal crayfish Pacifastacus leniusculus (Dana, 1852) (Decapoda, Astacidea), an invasive crayfish in Britain

Houghton

Wood

Lambin

2017

Crustac

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“…The great fen‐sedge C. mariscus is an additional bioindicator for habitat suitability, as it also requires base‐rich (alkaline) to oligo‐mesotrophic habitats (Salmina, ). Furthermore, Characeae are known to be consumed by A. pallipes , especially in lakes (Matthews & Reynolds, ; Reynolds & O'Keeffe, ) and they are probably a source of calcium that can be used by crayfish for the biomineralization of the exoskeleton (Scalici & Gibertini, ). This calcium can be provided from parts of thalli with encrustations and calcareous gyrogonites frequently preserved in the sediments after charophytes decay (Kufel, Strzalek, & Biardzka, ), or from the availability of calcium and bicarbonate during algal growth and stocking (Kufel & Kufel, ).…”

Section: Discussionmentioning

confidence: 99%

The use of Chara spp. (Charales: Characeae) as a bioindicator of physico‐chemical habitat suitability for an endangered crayfish Austropotamobius pallipes in lentic waters

Beaune¹,

Sellier²,

Lambert

et al. 2017

Aquatic Conservation

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Austropotamobius pallipes is an endangered decapod attracting much attention in freshwater conservation programmes. In some cases population transfers or reintroductions are carried out in lentic ecosystems such as ponds or quarries. Such conservation actions require rapid, low cost and powerful tools to census suitable habitat. Some species of the Characeae family (Chara spp.), share ecological needs with A. pallipes and are proposed as bioindicators of suitable habitat. Chara species were tested, among other plants, as bioindicators, and to see whether Chara species are a stronger indicator than water chemistry. The Pinail Nature Reserve, with 3000 permanent ponds, is inhabited by white‐clawed crayfish probably introduced historically into ponds used for fish production. This allows a replicated study of suitable habitats where plant communities are bioindicators of crayfish presence. Crayfish presence is associated with Chara species (such as Chara aspera, Chara virgata, Chara fragifera, Chara polyacantha and Chara vulgaris). Austropotamobius pallipes is present in ponds with Chara spp. (N = 10/10) while other ponds without crayfish are lacking charophytes (N = 1/23). Algae of the genus Chara are thus a simple and low‐cost additional tool for determining suitable habitat for crayfish introductions within enclosed waters protected from exotic invasive species and disease. Cladium mariscus also appears to be another useful bioindicator for crayfish habitat.

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Test of injectable elastomer tags on white-clawed crayfishAustropotamobius pallipes(Lereboullet)

Gotteland¹

2013

Freshwater Crayfish

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Molt and gastroliths inAustropotamobius pallipes(Lereboullet, 1858)

Cited by 3 publications

References 18 publications

Size-mediated, density-dependent cannibalism in the signal crayfish Pacifastacus leniusculus (Dana, 1852) (Decapoda, Astacidea), an invasive crayfish in Britain

Size-mediated, density-dependent cannibalism in the signal crayfish Pacifastacus leniusculus (Dana, 1852) (Decapoda, Astacidea), an invasive crayfish in Britain

The use of Chara spp. (Charales: Characeae) as a bioindicator of physico‐chemical habitat suitability for an endangered crayfish Austropotamobius pallipes in lentic waters

Test of injectable elastomer tags on white-clawed crayfishAustropotamobius pallipes(Lereboullet)

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