Habitat Preference of Different Size Classes of Austropotamobius Pallipes in an Irish River

Demers, Andréanne; Reynolds, J. D.; Cioni, Astra

doi:10.1051/kmae:2003008

Cited by 23 publications

(13 citation statements)

References 18 publications

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“…Gherardi et al 1996;Grandjean et al 1998Grandjean et al , 2000Grandjean et al , 2003Largiarder et al 2000;Demers et al 2003;Trouilhe et al 2003;Fratini et al 2005). This provides enough information to preserve this species in situ.…”

Section: Introductionmentioning

confidence: 99%

Feeding habits of the crayfishAustropotamobius pallipes(Decapoda, Astacidae) in a brook in Latium (central Italy)

Scalici¹,

Gibertini²

2007

Italian Journal of Zoology

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The several studies regarding the feeding habits of freshwater decapods have provided a few detailed descriptions of their natural diets and have seldom analysed variations in their feeding habits due to season, size, age, and changes in their physiological state. This situation led us to analyse the stomach content of different age classes of the crayfish Austropotamobius pallipes, in order to increase the knowledge available on this species' diet. Ingestion index, vacuity frequency, and occurrence frequency were calculated; then, a graphical representation was carried out only for the animal component (mainly insect larvae) observed within the stomach. The results show A. pallipes to be an omnivorous and opportunistic animal. Its diet includes the exploitation of more easily accessible vegetal and detritus resources, which are the main sources of energy and proteins in freshwater ecosystems. Invertebrates are very important for the crayfish diet; in fact, the animal component, and in particular Tricoptera, Diptera, and shellfish, plays a very important role for juveniles and adult females. Feeding strategies might reduce competition between sexes, satisfying their energetic and nutritional needs. The acquired knowledge of the crayfish trophic niche may be used, for example, to improve the diet of animals kept in captivity.

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Section: Introductionmentioning

confidence: 99%

Feeding habits of the crayfishAustropotamobius pallipes(Decapoda, Astacidae) in a brook in Latium (central Italy)

Scalici¹,

Gibertini²

2007

Italian Journal of Zoology

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“…SCHULZ and KIRCHLEHNER (1984) showed that A. torrentium abundance was correlated to the relative amount of stones and pieces of wood, serving as shelter for this crayfish. DEMERS, REYNOLDS and CIONI, (2004) investigated habitat preference of different size classes of A. pallipes in an Irish River. Whereas adult crayfish occur under stones and cobble in the river, smaller individuals may be found along the margins, among rootlets and vegetation (SMITH et al, 1996;REYJOL and ROQUEPLO, 2002).…”

Section: Introductionmentioning

confidence: 99%

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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“…Decapods are easy to recognise, individuals are a suitable size to pinpoint and handle, they can be handled without harming the animal and are not dangerous for interested people, either. Another advantage of this animal group is that many crayfish species are widespread, not only existing in some remote reserves, and they also occur in different habitat types (DEMERS et al, 2003). They have a hard shell, too, containing distinguishing structures for identification, and thus useful pictures can also be made from remains.…”

Section: Discussionmentioning

confidence: 99%

Technical Note a New, Volunteer-Based, Cost Effective Method for Zoological Mapping: The Photo Identification of Freshwater Crayfish (Crustacea: Decapoda) Species and the Importance of Volunteers in Crayfish Research

Puky¹

2006

Bull. Fr. Pêche Piscic.

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The publication of the European Crayfish Atlas within the framework of the CRAYNET programme is a major breakthrough in Decapoda mapping in Europe. The current data base contains information from approximately 60-70% of the 50 km × 50 km squares covering the continent. A new method to improve this situation further is the use of photo identification involving volunteers in the collection of distribution data. The crayfish identification ability of two potential user groups, astacologists and biology teachers/students, was tested using the questionnaire given in Figure 2. One picture (Astacus leptodactylus male) was correctly identified by everyone, the others were recognised by 59-94% (astacologists) and 30-88% (non-crayfish specialised biology teachers and students). The first European Decapoda photo identification survey proved that the necessary expertise exists in the continent to determine crayfish species from pictures and also that the quality of the pictures is less important than the presence of key details. Photo identification is a low cost and environmental-friendly approach but it also needs special considerations. Volunteers need to be supported in several ways, such as by providing precise and interesting educational material in an easily understandable language describing e.g. the key parts of the body to photograph. However, the general use of digital cameras and even mobile phones/cameras and the Internet is an effective way to launch such surveys as it gives, on one hand, an opportunity for the specialists to check, and if necessary correct, the field identification of less experienced people and, on the other hand, it provides a much larger data base than what is available now by using the data collected by students, conservationists, scouts or other volunteers.Key-words: crayfish, Decapoda, methodology, mapping, education, conservation. NOTE TECHNIQUE UNE NOUVELLE MÉTHODE ÉCONOMIQUE, BASÉE SUR LE VOLONTARIAT, POUR LA CARTOGRAPHIE ZOOLOGIQUE : IDENTIFICATION DES ÉCREVISSES (CRUSTACEA, DECAPODA) D'APRÈS PHOTOS, ET IMPORTANCE DES VOLONTAIRES DANS LA RECHERCHE SUR LES ÉCREVISSES RÉSUMÉLa publication de l'atlas des écrevisses d'Europe dans le cadre du programme CRAYNET est une contribution importante pour la cartographie des Décapodes en Europe. La base de données associée contient des informations sur environ 60-70 % des mailles UTM de 50 km × 50 km couvrant le continent. Une nouvelle méthode permettant l'amélioration de cette situation consiste en l'utilisation de photos fournies via la mobilisation de bénévoles réunissant les données de distribution. La capacité d'identifier les écrevisses de deux groupes, les astacologistes d'une part, et les enseignants et étudiants en biologie d'autre part, a été testée en utilisant le questionnaire de la Figure 2. Une photo (Astacus leptodactylus) a été correctement identifiée par tous et les autres photos par respectivement 59-94 % des astacologistes et 30-38 % des enseignants et étudiants en biologie mais non spécialistes des écrevisses. Ce prem...

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Habitat Preference of Different Size Classes of Austropotamobius Pallipes in an Irish River

Cited by 23 publications

References 18 publications

Feeding habits of the crayfishAustropotamobius pallipes(Decapoda, Astacidae) in a brook in Latium (central Italy)

Feeding habits of the crayfishAustropotamobius pallipes(Decapoda, Astacidae) in a brook in Latium (central Italy)

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

Technical Note a New, Volunteer-Based, Cost Effective Method for Zoological Mapping: The Photo Identification of Freshwater Crayfish (Crustacea: Decapoda) Species and the Importance of Volunteers in Crayfish Research

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