Movement Patterns of the White-clawed Crayfish,<i>Austropotamobius pallipes</i>, in a Tuscan Stream

Gherardi, Francesca; Barbaresi, Silvia; Villanelli, Fabio

doi:10.1080/02705060.1998.9663638

Cited by 47 publications

(47 citation statements)

References 18 publications

(29 reference statements)

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“…In general, there was no clear preference for upstream or downstream movements of A. torrentium in the Biberbach, Lower Austria. Comparable results are published for populations of A. pallipes by GHERARDI, BARBARESI and VILANELLI, 1998, and ROBINSON, THOM and LUCAS, 2000. KLOSTERMAN and GOLDMAN, 1981, showed that juveniles of signal crayfish, Pacifastacus leniusculus, had a clear preference for upstream movements in the laboratory.…”

Section: Figuresupporting

confidence: 65%

Austropotamobius Torrentium as an Indicator for Habitat Quality in Running Waters?

Pöckl¹,

Streissl²

2005

Bull. Fr. Pêche Piscic.

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In the present study we tried to quantify the indication value of A. torrentium referring to habitat quality. This variable is expressed as the availability of appropriate refuge stones on the bottom and banks of running waters. The brooks occupied by the indigenous stone crayfish in Lower Austria show a high variability in the current velocity and substrate heterogeneity. Having some experience in hand searching we assumed that the distribution pattern of the crayfish on the stream bed is strongly correlated with the distribution of cobble and pebbles within a certain grain size. The aim of our study was to quantify the dependence of the shelter requirements for A. torrentium on grain size and water velocity, as well as the seasonal mobility of the crayfish. Shelters where velocity exceeded 25 cm s -1 were not occupied. Pebbles with a bearing surface greater than 300 cm 2 were preferred, and the probability of crayfish occupation rose quickly as the stone's bearing surface increased up to 900 cm 2 . Most individuals changed their location only a few meters (median 4 m). The distance from the point of first capture increased only little within the length of time passed until re-capture, suggesting a conservative use of space. Key-words:Austropotamobius torrentium, substrate heterogeneity, shelter requirements, seasonal mobility, number of crayfish outside shelters, sexual ratio. AUSTROPOTAMOBIUS TORRENTIUM EST-ELLE UN INDICATEUR DE LA QUALITÉ DES HABITATS DANS LES EAUX COURANTES ? RÉSUMÉLa présente étude tente de quantifier la valeur indicative de A. torrentium par rapport à la qualité de l'habitat. Cette variable s'exprime en disponibilité en pierres servant d'abris dans le fond et les berges des rivières. Les ruisseaux occupés par des écrevisses des torrents autochtones en Basse Autriche montrent une grande variabilité de la vélocité du courant et de l'hétérogénéité du substrat. Ayant quelque expérience de la collecte manuelle, nous avons supposé que la distribution des écrevisses dans le lit du courant est fortement corrélée à celle des galets et des cailloux d'une certaine granulométrie. -744 -Le but de notre étude était de quantifier la dépendance des besoins en refuges pour A. torrentium en fonction de la granulométrie et de la vitesse du courant, ainsi que de la mobilité saisonnière des écrevisses. Les refuges où la vitesse du courant est supérieure à 25 cm.s -1 ne sont pas occupés. Les galets dont la surface d'appui dépasse les 300 cm 2 sont préférés, et la probabilité d'occupation augmente rapidement avec la surface d'appui des pierres, jusqu'à 900 cm 2 . La plupart des individus se déplacent seulement de quelques mètres (médiane 4 m). La distance entre le point de première capture et la recapture augmente peu lorsque l'intervalle de temps entre les captures augmente, ce qui suggère une utilisation conservatrice de l'espace. Mots-clés :Austropotamobius torrentium, hétérogénéité du substrat, exigences en abris, mobilité saisonnière, nombre d´écrevisses hors de leurs abris, sex-ratio.

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Section: Figuresupporting

confidence: 65%

Austropotamobius Torrentium as an Indicator for Habitat Quality in Running Waters?

Pöckl¹,

Streissl²

2005

Bull. Fr. Pêche Piscic.

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“…There have been suggestions that the composition of diet and feeding behaviour of crayfish varies with season (Goddard, 1988;Guan and Wiles, 1998), although evidence remains limited. Crayfish activity is seasonally variable being strongly regulated by water temperature (Gheradi et al, 1998;Bubb et al, 2004) as is the availability of macroinvertebrate prey (Allan, 1981).…”

Section: Introductionmentioning

confidence: 99%

The long-term effects of invasive signal crayfish (Pacifastacus leniusculus) on instream macroinvertebrate communities

Mathers

Chadd

Dunbar

et al. 2016

Science of The Total Environment

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“…Köksal (1988) reported that the males of A. leptodactylus were more active than the females, and also females were inactive during the breeding season (November to June) and the proportion of females per catch ranged from 29-43% from November to the end of June. The lower catches during winter and spring with respect to summer and autumn could be related to minor activity of crayfish after breeding and later, for females only, after spawning (Gherardi et al, 1997;Kirjavainen and Westman, 1999;Grandjean et al, 2000;Capurro et al, 2007). Differences in sex ratios over seasons could mainly be due to differences in the activity pattern of males and females (Westin and Gydemo, 1989;Hudina et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

A study on the morphometric characteristics ofAstacus leptodactylusinhabiting the Thrace region of Turkey

Deniz

Harlıoğlu

Deval

2010

Knowl. Managt. Aquatic Ecosyst.

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Key-words:crayfish, morphometric characters, length-weight relationship, allometric growth, Thrace regionThis study was carried out to determine some morphological characteristics, and the length-length and length-weight relationships of freshwater crayfish (A. leptodactylus Eschscholtz 1823) in the area of Tekirdag, in the Thrace region of Turkey. The total length and wet weight for all individuals ranged from 33 to 156 mm and 0.64 to 96.42 g, respectively. Although the average length of both sexes was nearly the same, the average weight of male crayfish was higher than that of females. The total length-wet weight relationships for males, females and combined sexes of wet weight were found to be: WW = 7.10 6 TL 3.293 , WW = 2.10 5 TL 3.022 and WW = 9.10 6 TL 3.224 , respectively. Isometric growth for female crayfish and positive allometric growth for male crayfish were observed in all populations. The carapace length, carapace width, and chela length and width increased allometrically with total length (TL) in both sexes. In conclusion, the morphometric relations in A. leptodactylus observed in the present study could provide information for future studies and management plans. Cette étude a été conduite pour déterminer quelques caractéristiques morphologiques, les relations longueur-longueur et longueur-poids de l'écrevisse d'eau douce (A. leptodactylus Eschscholtz 1823) dans la zone de Tekirdag, dans la ré-gion Thrace de Turquie. Les longueurs totales et les poids frais de tous les individus vont de 33 à 156 mm et de 0,64 à 96,42 g respectivement. Bien que les longueurs moyennes des deux sexes soient très proches, le poids moyen des écrevisses mâles est supérieur à celui des femelles. La relation longueur totale (LT)-poids frais pour les mâles, femelles et sexes combinés, sont : WW = 7,10 6 TL 3,293 , WW = 2,10 5 TL 3,022 et WW = 9,10 6 TL 3,224 respectivement. Une croissance isomé-trique pour les écrevisses femelles et allométrique positive pour les mâles a été observée dans toutes les populations. Les longueurs et largeurs de carapace et de pince croissent allométriquement avec la longueur totale dans les deux sexes. En conclusion, les relations morphométriques observées chez A. leptodactylus dans cette étude peuvent apporter des informations pour des études ultérieures et les plans de gestion. RÉSUMÉ

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Movement Patterns of the White-clawed Crayfish,Austropotamobius pallipes, in a Tuscan Stream

Cited by 47 publications

References 18 publications

Austropotamobius Torrentium as an Indicator for Habitat Quality in Running Waters?

Austropotamobius Torrentium as an Indicator for Habitat Quality in Running Waters?

The long-term effects of invasive signal crayfish (Pacifastacus leniusculus) on instream macroinvertebrate communities

A study on the morphometric characteristics ofAstacus leptodactylusinhabiting the Thrace region of Turkey

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