Estimating age composition in Alpine native populations of Austropotamobius pallipes complex

Ghia, Daniela; Fea, Gianluca; Conti, Aurora; Sacchi, Roberto; Nardi, Pietro Angelo

doi:10.4081/jlimnol.2015.1139

Cited by 5 publications

(21 citation statements)

References 47 publications

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“…The relationship between female CL and the estimated pleopodal fecundity was described by linear regression, with CL as independent variable. Finally, we used principal component analysis (PCA) to plot different populations of the white-clawed crayfish species complex according to life-history traits (φ , k, t max , and CL ∞ ; as summarized in Scalici et al, 2010 andGhia et al, 2015).…”

Section: > Statistical Analysesmentioning

confidence: 99%

“…To estimate life-history traits, growth was described using the Von Bertalanffy's Growth Function (VBGF), adjusted for seasonal growth in summer and no growth in winter (Pauly and Morgan, 1987;Scalici et al, 2010;Ghia et al, 2015):…”

Section: > Growth and Life-history Traitsmentioning

confidence: 99%

“…An essential prerequisite for all of these conservation efforts is sound knowledge on distribution, population dynamics, and life history of white-clawed crayfish (cf. Souty-Grosset et al, 2006;Ghia et al, 2015). Previous studies on white-clawed crayfish suggest high latitudinal variation in population ecology (summarized in Ghia et al, 2015) and very little is known about its life history and populations dynamics in Germany.…”

Section: Introductionmentioning

confidence: 99%

“…Souty-Grosset et al, 2006;Ghia et al, 2015). Previous studies on white-clawed crayfish suggest high latitudinal variation in population ecology (summarized in Ghia et al, 2015) and very little is known about its life history and populations dynamics in Germany. The aim of this study was therefore to assess the distribution, abundance, and life-history traits of a white-clawed crayfish population in a small river in southwestern Germany in order to further our understanding of this highly endangered species and to facilitate its conservation.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, we used an established crayfish survey protocol to explore the spatial extent and abundance of the population, and estimated life-history traits from size-frequency distributions by means of the Von Bertalanffy's Growth Function (VBGF) (cf. Scalici et al, 2008;Ghia et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Population ecology of endangered white-clawed crayfish (Austropotamobius pallipess. str.) in a small rhithral river in Germany

Wendler

Biss

Chucholl

2015

Knowl. Manag. Aquat. Ecosyst.

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Key-words: population dynamics, imperiled species, white-clawed crayfish, stone crayfish, AustropotamobiusSound knowledge on distribution and ecology of imperiled species is an essential prerequisite for effective conservation planning. Here, we report the distribution and autecological traits of a newly discovered population of critically-endangered white-clawed crayfish (Austropotamobius pallipes s. str.) in a small river in southwestern Germany. Using an established crayfish survey protocol, we detected white-clawed crayfish in a river stretch of 4.5 km, with an estimated abundance of 1.4 ± 0.2 indiv.·m −2 . The sex ratio was even and sexual maturity was attained at approximately 25 mm carapace length (CL). Life-history traits, as assessed using Von Bertalanffy's growth function, indicate a life history most similar to populations in France, with longevity, asymptotic size, and growth performance index being higher in males than in females (11 y, 46 mm CL, and 2.8 and 9 y, 41 mm CL, and 2.7, for males and females, respectively). Estimated fecundity ranged from 9 to 135 eggs·female −1 (mean: 90 ± 28). White-clawed crayfish were also found in lower reaches of small tributary streams, of which one also featured endangered stone crayfish (Austropotamobius torrentium). A syntopic occurrence of both species was recorded for the first time within a short stretch. Implications for species conservation are discussed. RÉSUMÉÉcologie de la population d'écrevisses à pattes blanches, en danger (Austropotamobius pallipes s. str.) dans un petit torrent en Allemagne Mots-clés :dynamique des populations, espèces en péril, écrevisse à pattes blanches, Une bonne connaissance sur la distribution et l'écologie des espèces en péril est une condition essentielle pour la planification d'une conservation efficace. Ici, nous rapportons la distribution et les traits autécologiques d'une population nouvellement découverte d'écrevisses à pattes blanches en danger critique (Austropotamobius pallipes s. str.) dans une petite rivière du sud-ouest d'Allemagne. Utilisant un protocole standard de suivi de l'écrevisse, nous avons détecté l'écrevisse à pattes blanches dans un tronçon de la rivière de 4,5 km, avec une abondance estimée de 1,4 ± 0,2 indiv·m −2 . Le sexe ratio était de un et la maturité sexuelle est

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Section: > Statistical Analysesmentioning

confidence: 99%

Section: > Growth and Life-history Traitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Population ecology of endangered white-clawed crayfish (Austropotamobius pallipess. str.) in a small rhithral river in Germany

Wendler

Biss

Chucholl

2015

Knowl. Manag. Aquat. Ecosyst.

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Preliminary data on the distribution, morphology and genetics of white-clawed crayfish and on their ectosymbionts in Lunigiana (Tuscany, Italy)

Boschetti

Culicchi

Guerrini

et al. 2018

Knowl. Manag. Aquat. Ecosyst.

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-The white-clawed crayfish is a complex of species (Austropotamobius pallipes plus A. italicus, Crustacea) pivotal to riverine environments. Regrettably, it is endangered in many European countries due to a recent massive decline. We carried out a fine-scale survey on white-clawed crayfish distribution, morphology and genetics in an under-investigated region of central Italy (Lunigiana, Tuscany) to improve local knowledge and aid conservation management of the species. The torrential fauna of Lunigiana is scarcely known and habitat alterations due to the anthropic exploitation of the territory represent a potential threat to its persistence. We investigated crayfish occurrence in eight streams of the Magra River Basin. We performed nocturnal and diurnal transects, took morphometric measurements, collected samples for genetic analysis and checked for the occurrence of ectosymbionts. Crayfish were disclosed in two streams (Civasola, Verdesina). Morphometric and phylogenetic analysis (mtDNA COI gene Bayesian tree reconstruction) concurrently identified both populations as Austropotamobius italicus carinthiacus. In the Verdesina stream, crayfish were heavily infested by branchiobdellidans (Annelida). Verdesina crayfish were also significantly smaller than those found in the Civasola stream, where branchiobdellidans were absent. Hence, we hypothesized that such difference in size might be related to the high density of ectosymbionts. In the light of habitat features and of data herein provided, we propose that both Civasola and Verdesina streams should be considered as "natural ark sites" for A. italicus, with the Magra River Basin representing a regional stronghold for the conservation of the species.Keywords: astacidae / branchiobdellida / cytochrome oxidase I / DNA barcoding / Austropotamobius fulcisianus Résumé -Données préliminaires sur la distribution, la morphologie et la génétique des écrevisses à pattes blanches et leurs ectosymbiotes en Lunigiana (Toscane, Italie). L'écrevisse à pattes blanches est un complexe d'espèces (Austropotamobius pallipes plus A. italicus, Crustacé) qui est une espèce clé des environnements fluviaux. Malheureusement, elle est menacée dans de nombreux pays européens en raison d'un récent déclin massif. Nous avons réalisé une étude détaillée sur la distribution et la génétique de l'écrevisse à pattes blanches dans une région du centre de l'Italie (Lunigiana, Toscane) peu étudiée afin d'améliorer les connaissances locales et de faciliter la gestion de la conservation de l'espèce. La faune des rivières de Lunigiana est peu connue et l'altération des habitats due à l'exploitation anthropique du territoire représente une menace potentielle pour sa persistance. Nous avons étudié la présence d'écrevisses dans huit cours d'eau du bassin de la rivière Magra. Nous avons effectué des transects nocturnes et diurnes, pris des mesures morphométriques, prélevé des échantillons pour des analyses génétiques et vérifié la présence d'ectosymbiotes. Les écrevisses ont été trouvées dans deux cou...

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Population dynamics of the crayfish Cambarellus chapalanus from the San Juan Cosalá Mountain Range, Jalisco, Mexico

Cáceres

Ibarra-García²,

Rodríguez‐Zaragoza³

et al. 2022

Rev.Mex.Biodiv.

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Cambarellus chapalanus is an endemic species of the area around Lake Chapala in Mexico and knowledge about its biology and ecology is scarce. Its population dynamics were evaluated based on individual growth, mortality, production, and productivity. For this, individuals were collected between November 2011 and October 2012, in ponds located in the Sierra San Juan Cosalá, Jalisco, Mexico. The abiotic variables of ponds (depth, temperature, pH, precipitation, and evaporation) presented significant variations during the study. Abundance was similar throughout the year but was related to an increase in temperature and evaporation of ponds. Furthermore, males were more abundant than females. Growth was fast and oscillatory with slow phases in rainy periods. Mortality was high and started at medium sizes; however, high somatic production also generated high population productivity. In general, the parameters of C. chapalanus showed normal patterns for a natural population; however, were strongly influenced by temperature and pond volume, probably because it is an isolated population in Sierra San Juan Cosalá.

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Estimating age composition in Alpine native populations of Austropotamobius pallipes complex

Abstract: Assessing the population structure and understanding growth patterns is crucial to manage freshwater resources and to solve fundamental questions concerning endangered species conservation. Austropotamobius pallipes (Lereboullet, 1858)

Cited by 5 publications

References 47 publications

Population ecology of endangered white-clawed crayfish (Austropotamobius pallipess. str.) in a small rhithral river in Germany

Population ecology of endangered white-clawed crayfish (Austropotamobius pallipess. str.) in a small rhithral river in Germany

Preliminary data on the distribution, morphology and genetics of white-clawed crayfish and on their ectosymbionts in Lunigiana (Tuscany, Italy)

Population dynamics of the crayfish Cambarellus chapalanus from the San Juan Cosalá Mountain Range, Jalisco, Mexico

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