Microhabitat use by the white‐clawed crayfish in a Tuscan stream

Benvenuto, Chiara; Gherardi, Francesca; Ilhéu, Maria

doi:10.1080/00222930701799090

Cited by 18 publications

(25 citation statements)

References 45 publications

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“…Broquet et al, 2002;Svobodová et al, 2008), riparian vegetation and the overall surroundings of streams (Bohl, 1987), the quality of shelters (Streissl and Hödl, 2002;Pöckl and Streissl, 2005) and overall microhabitat features (e.g. Troschel, 1997;Benvenuto et al, 2008;Clavero et al, 2009). The main aim of this paper is to assess the role of substrata, position and depth in the stream on the occurrence, distribution and abundance of particular of stone crayfish size groups in day-time in typical habitats in the Czech Republic.…”

Section: Introductionmentioning

confidence: 99%

Microhabitat preferences of the stone crayfishAustropotamobius torrentium(Schrank, 1803)

Vlach

Fischer

Hulec

2009

Knowl. Managt. Aquatic Ecosyst.

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Key-words:habitat selection, microhabitat electivity index, Czech RepublicThe stone crayfish Austropotamobius torrentium (Schrank, 1803) is a species that usually prefers small and medium-sized streams. It is mainly dependent on coarse grained substrata, which it uses as shelter, but has also been observed on clay in which it creates burrows, similarly to other species of crayfish. In this study, the microhabitat preferences of the stone crayfish in day-time were evaluated. In 2008 (June-November) we collected data on stone crayfish abundances in 1263 patches, recording their position in streams (in five categories: 1. current, 2. lee, 3. shoreline, 4. backwater, 5. rapids), dominant substratum (in seven categories: 1. mud, 2. sand, 3. fine gravel, 4. gravel, 5. pebbles, 6. stones, 7. boulders) in eight streams in the West Bohemia region. This data was evaluated using an index of microhabitat electivity (calculated as the difference between the expected (calculated from all the samples) and actual frequency of occurrence in habitats within a given environmental parameter) and multivariate analysis (redundancy detrended analysis). Substratum type was the major determinant of microhabitat preference for all size classes (< 15 mm, 15-30 mm, 30-60 mm, 60-90 mm, > 90 mm). There was a generalised avoidance of fine-grained substrata and a preference for coarser ones, which was more evident in larger size groups. The substrata character explained 8.7% of the variability in distribution. The parameter "depth" explained 1% of the overall crayfish variability distribution. Nevertheless, an avoidance of greater depths by small stone crayfish individuals was found, as well as an avoidance of shallows by the largest size categories. No major preference was noted for different stream positions (which explained only 0.7% of the microhabitat use variability), but crayfish avoided rapids with higher water velocities. , nous avons collecté des données d'abondance de l'écrevisse des torrents dans 1263 emplacements, tenant compte de leur position dans la rivière (en cinq catégories : 1. courant, 2. contre-courant, 3. berge, 4. calme, 5. rapide), et du substrat dominant (en sept catégories : 1. vase, 2. sable, 3. graviers fins, 4. graviers, 5. galets, 6. pierres, 7. blocs) dans huit rivières de la région Ouest-Bohème. Ces données ont été analysées en utilisant un index d'électivité de microhabitat (différence entre les fréquences d'occurrence escomptée (calculée pour l'ensemble des échantillons) et observée dans les habitats pour un même paramètre environnemental) et une analyse multivariée (analyse canonique de redondance). Le type de substrat est le déterminant majeur de la préférence du microhabitat pour toutes les classes de taille (< 15 mm, 15-30 mm, 30-60 mm, 60-90 mm, > 90 mm). Il y a un évitement général pour les substrats fins et une préférence pour les plus gros, qui est plus marquée pour les plus grandes tailles. Le type de substrat explique 8,7 % de la variabilité de distribution. Le paramètre « profondeur » expl...

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Section: Introductionmentioning

confidence: 99%

Microhabitat preferences of the stone crayfishAustropotamobius torrentium(Schrank, 1803)

Vlach

Fischer

Hulec

2009

Knowl. Managt. Aquatic Ecosyst.

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“…Crayfish use all the wide range of conductivities found in the area, although the best populations are found in waters with medium to high values (over 400 µS·cm −1 ), as previously reported Martinez et al, 2003). Riparian vegetation structure was not found to be a limiting factor, as otherwise noted (Benvenuto et al, 2008), and some of our populations lived under low quality riparian vegetation. On the other hand, all populations shared the availability of different types of shelters.…”

Section: Figurementioning

confidence: 73%

Factors related to the presence of theAustropotamobius pallipes(Lereboullet, 1858) species complex in calcareous mountin rivers in central Spain

Arce¹,

Alonso²

2011

Knowl. Managt. Aquatic Ecosyst.

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Key-words: Austropotamobius pallipes, distribution, habitat, managementAlto Tajo Natural Park is a protected area in Central Spain. Mainly welldrained limestone country, this area has traditionally held abundant whiteclawed crayfish populations. Nevertheless, its occurrence has decreased during the last few decades because of different factors. To address the scarce information on the species, an extensive survey including habitat characterisation was carried out during the summer of 2008, sampling 116 water bodies. Using a combination of survey techniques, a total of 23 populations in different degrees of conservation was found. Crayfish mainly inhabited headwater stretches less than 1 km in length, together with small ponds. A significant proportion of these populations could be related to previous stocking events. The present study revealed a high degree of isolation, with populations showing a fragmented distribution pattern. The information obtained might be used to discriminate the most adequate localities for future stocking actions, hopefully improving the success of this management tool. RÉSUMÉDes facteurs liés à la présence du complexe spécifique Austropotamobius pallipes (Lereboullet, 1858) en rivières calcaires de montagne du centre de l'Espagne Mots-clés : Austropotamobius pallipes, distribution, habitat, gestionLe parc naturel Alto Tajo est un site protégé situé au centre de l'Espagne. Au caractère notamment calcaire, cette zone a hébergé traditionnellement d'abondantes populations d'écrevisses ibériques. Pourtant, sa présence a été réduite pendant les dernières décades à cause de différents facteurs. Pour pallier ce manque d'information sur les espèces, on a réalisé une étude exhaustive de 116 masses d'eau pendant l'été 2008, y compris une caractérisation d'habitat. En utilisant une combinaison de méthodes de suivi, on a trouvé 23 populations en différents états de conservation. Les écrevisses occupant les têtes de bassin versant sur des tronçons de moins de 1 km ainsi que de petits étangs. Une proportion significative de ces populations serait issue de précédents repeuplements. Cette étude a prouvé un haut niveau d'isolement des populations qui montrent un modèle de distribution fragmentée. Ces résultats serviront à discriminer les points les plus appropriés pour les futurs repeuplements envisageant une amélioration de l'efficacité de cet outil de gestion.

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“…For example, Clavero et al (2009) identified a preference for deeper habitat among adult size classes that was lacking in juveniles. Two further studies similarly found that juveniles made greater use of the shallow channel margins than adults and were presumed to be exploiting refugia within exposed roots (Smith et al, 1996;Benvenuto et al, 2008). Ream et al (2009) found that small crayfish (1þ) tended to use smaller pebble substrates during daytime refuge.…”

Section: Habitat Partitioningmentioning

confidence: 91%

“…It is unclear whether this relationship reflects a true habitat preference among A. pallipes or distribution patterns resulting from the spread of invasive crayfish which generally expand their range upstream from the lower reaches of watercourses with the remaining native populations persisting in headwaters (Collas et al, 2007). Three studies, all at the reach scale, reported a negative association with flow rate (Armitage, 2000;Bubb et al, 2006;Benvenuto et al, 2008), and one a negative association with riffles (Benvenuto et al, 2008). Although A. pallipes is largely restricted to running waters, it is generally absent from those with very high flow rates (Foster, 1995).…”

Section: Hydrodynamics and Water Temperaturementioning

confidence: 99%

“…Trees, in addition to providing leaf inputs, supply cover and shade, thereby likely reducing predation risk and maintaining cool water temperatures which are associated with higher dissolved oxygen concentration. The woody debris and roots associated with trees are important refugia, particularly for juveniles (Benvenuto et al, 2008;Neveu, 2009) and where flow regimes are "flashy" (Smith et al, 1996).…”

Section: Vegetationmentioning

confidence: 99%

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

Rosewarne

Mortimer

Dunn

2017

Knowl. Manag. Aquat. Ecosyst.

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-Understanding habitat requirements is a key part of conserving declining species, particularly when reintroductions are planned as part of the recovery strategy. The white-clawed crayfish (Austropotamobius pallipes) has undergone severe declines across its range and is now classified by the International Union for Conservation of Nature (IUCN) as 'endangered'. Translocation of threatened A. pallipes populations to isolated 'Ark sites' where threats are minimised is an increasingly used conservation tool. A full feasibility assessment of potential Ark sites, including an assessment of habitat suitability, is recommended within translocation guidelines developed by the IUCN. This literature review employed a systematic search and 'vote counting' approach to identify and assess the relative importance of physical habitat requirements of A. pallipes. Many habitat features were positively associated with crayfish presence, in particular: boulder substrate, trees/shading, woody debris, exposed roots, and undercut banks; and habitat use patterns varied among crayfish sexes and size classes. Ark sites should incorporate heterogeneous habitat, with as many of these features as possible, to provide both ample refugia and rich foraging areas.Keywords: freshwater / habitat suitability / translocation / conservation / aquatic invertebrate Résumé -Utilisation de l'habitat par le complexe d'espèces d'Austropotamobius, écrevisses à pieds blancs menacées : revue systématique. La compréhension des besoins en matière d'habitat est un élément clé de la conservation des espèces en déclin, en particulier lorsque des réintroductions sont prévues dans le cadre de la stratégie de restauration. L'écrevisse à pieds blancs (Austropotamobius pallipes) a subi de graves déclins dans toute son aire de répartition et est maintenant classée en « espèce en danger ». La translocation des populations d'A. pallipes menacées vers des « sites Ark » isolés où les menaces sont minimisées est un outil de conservation de plus en plus utilisé. Une évaluation complète de la faisabilité des sites 'Ark' potentiels, y compris une évaluation de l'aptitude des habitats, est recommandée dans les lignes directrices sur la translocation élaborées par l'UICN. Cette revue de littérature a fait appel à une recherche systématique et à une méthode de 'vote counting' pour identifier et évaluer l'importance relative des besoins en matière d'habitat physique d'A. pallipes. De nombreuses caractéristiques de l'habitat ont été positivement associées à la présence d'écrevisses, notamment : substrat de blocs, arbres / ombrage, débris ligneux, racines exposées et berges surplombantes ; et les habitudes d'utilisation de l'habitat varient selon les sexes et les classes de taille des écrevisses. Les sites Ark devraient intégrer un habitat hétérogène, avec autant de ces caractéristiques que possible, pour fournir à la fois suffisamment de refuges et de riches zones de ravitaillement.Mots clés : eau douce / habitat adéquat / translocation / préservation / invertébré aquatique

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Microhabitat use by the white‐clawed crayfish in a Tuscan stream

Cited by 18 publications

References 45 publications

Microhabitat preferences of the stone crayfishAustropotamobius torrentium(Schrank, 1803)

Microhabitat preferences of the stone crayfishAustropotamobius torrentium(Schrank, 1803)

Factors related to the presence of theAustropotamobius pallipes(Lereboullet, 1858) species complex in calcareous mountin rivers in central Spain

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

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