Conference PaperPDF Available

Contributo allo studio della popolazione di Hydromantes (Speleomantes) strinatii delle Grotte del Bandito (Alpi Marittime, Italia nordoccidentale)

Authors:
  • Agenzia Regionale per la Protezione dell'Ambiente Ligure
  • CESBIN Srl
Conference Paper

Contributo allo studio della popolazione di Hydromantes (Speleomantes) strinatii delle Grotte del Bandito (Alpi Marittime, Italia nordoccidentale)

Abstract

Riassunto. A contribution to the study of the population of Hydromantes (Speleomantes) strinatii in the Bandito Caves (Marittime Alps, northwestern Italy). The aim of our study was to estimate the number of specimens and the structure of the Hydromantes (Speleomantes) strinatii population living in the karst system called the "Grotte del Bandito" (Alpes-Maritimes, ITALY). The research was carried out in three day of capture with temporary removal of animals. Data obtained were processed using the software Fisat II and Capture. We have captured a total of 36 specimens during the three-day sampling effort (27 adults, 4 subadults and 5 young), including three animals with obvious malformations, two males without the left eye and one with a cysts on the right side. The analysis of the structure of the population through the distribution of body size show a single component corresponds to adults with SVL (Snout-Vent Length) between 42 mm and 74 mm (mean = 60.43 mm, St. Dev. = ± 5.24). Statistical analysis allowed us to estimate a population of 56 specimens (St. Dev. = ± 4, 67) with constant probability of capture and of 45 specimens (St. Dev. = ± 7.74) with capture probability variable. The results of this preliminary study show a different situation compared with other populations of the same species: prevalence of adult, sex ratio skewed towards males, few juveniles and only one female observed with eggs. The causes should be researched both in difficulty of sampling site both in the particular ecological conditions that may affect the spatial and/or temporal probability of capture of the different age groups. Il geotritone di Strinati è un Anfibio Caudato appartenente alla famiglia Plethodontidae endemico della Francia sud-orientale e dell'Italia nord-occidentale, con una distribuzione altitudinale molto ampia, essendo presente dal livello del mare (Bologna & Salvidio, 2006) fino a quasi 2500 m slm (Renet, com. pers.). Il sito di studio è situato nel complesso carsico denominato "Grotte del Bandito", all'interno del SIC "IT1160056 -Alpi Marittime" nel comune di Roaschia (CN), ad una quota di circa 730 m s.l.m. Tale sito è ampiamente conosciuto fin dalla fine del XIX secolo,
A preview of the PDF is not available
ResearchGate has not been able to resolve any citations for this publication.
Article
Full-text available
A Speleomantes ambrosii population living in an artificial tunnel in NW Italy was studied for two consecutive years. Activity on the walls varied cyclically in relation to seasonal temperatures and food abundance. The main food item was the trogloxenic dipteran Limonia nubeculosa, which accounted for more than 80% of the total ingested prey by volume. Juvenile cave salamanders had a broader trophic nich than adults. Oviposition and juvenile recruitment appeared to be seasonal. The spatial distribution inside the tunnel was related to microhabitat heterogeneity and particularly to the distance from the entrance. Juveniles were observed outside or close to the entrance more often than adults. Movement of adult salamanders were generally low and averaged 7 cm/day; some repeatedly recaptured individuals had a mean home range of 6 m2.
Article
An approximate method of solution is given of the problem of resolution of a distribution into Gaussian components when the component distributions are adequately separated. Illustrative examples are given.
Article
In this paper the problem of finding robust estimators of population size in closed K-sample capture-recapture experiments is considered. Particular attention is paid to models where heterogeneity of capture probabilities is allowed. First, a general estimation procedure is given which does not depend on any assumptions about the form of the distribution of capture probabilities. This is followed by a detailed discussion of the usefulness of the generalized jackknife technique to reduce bias. Numerical comparisons of the bias and variance of various estimators are given. Finally, a general discussion is given with several recommendations on estimators to be used in practice.
Speleomantes strinatii (Aellen, 1958) In: Atlante degli Anfibi e dei Rettili d'Italia
  • M A Bologna
  • S Salvidio
  • R Sindaco
  • G Doria
  • E Razzetti
Bologna, M.A., Salvidio, S. (2006): Speleomantes strinatii (Aellen, 1958). In: Atlante degli Anfibi e dei Rettili d'Italia, p. 258-261. Sindaco, R., Doria, G., Razzetti, E., Bernini, F., Eds., Societas Herpetologica Italica, Edizioni Polistampa, Firenze.
Studio preliminare sul ciclo annuale di Speleomantes strinatii e delle sue prede in una cavità artificiale della Liguria
  • F Oneto
  • S Salvidio
  • M V Pastorino
Oneto, F., Salvidio, S., Pastorino, M.V. (2003): Studio preliminare sul ciclo annuale di Speleomantes strinatii e delle sue prede in una cavità artificiale della Liguria. In: Atti XIX Congresso Nazionale di Speleologia (Bologna, 27-31 Agosto 2003), p. 177182. Gruppo Spleologico Bolognese, Bologna.
Osservazioni sulla dieta in natura del geotritone Hydromantes italicus Dunn (Amphibia, Caudata, Plethodontidae)
  • A Morisi
Morisi, A. (1981): Osservazioni sulla dieta in natura del geotritone Hydromantes italicus Dunn (Amphibia, Caudata, Plethodontidae). Riv. Piem. Sc. Nat. 2: 79-87.
  • M A Bologna
  • S Salvidio
Bologna, M.A., Salvidio, S. (2006): Speleomantes strinatii (Aellen, 1958). In: Atlante degli Anfibi e dei Rettili d'Italia, p. 258-261. Sindaco, R., Doria, G., Razzetti, E., Bernini, F., Eds., Societas Herpetologica Italica, Edizioni Polistampa, Firenze.
User's Manual for Program CAPTURE
  • G C White
  • K P Burnham
  • D L Otis
  • D R Anderson
White, G.C., K.P. Burnham, D.L. Otis, D.R. Anderson, D.R. (1978): User's Manual for Program CAPTURE. Utah State University Press, Logan Utah.