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Documents disponibles dans cette catégorie (5)
Affiner la rechercheContribution à l'étude de la répartition du Triton alpestre hellénique : Triturus alpestris veluchiensis / Pénélope Adamakopoulos-Matsoukas in Revue valdôtaine d'histoire naturelle, 48 (suppl.) (1994)
Titre : Contribution à l'étude de la répartition du Triton alpestre hellénique : Triturus alpestris veluchiensis Type de document : Imprimé Auteurs : Pénélope Adamakopoulos-Matsoukas Année de publication : 1994 Article en page(s) : 65-72 Langues : Français (fre) Catégories : [CBNPMP-Thématique] Amphibiens Note de contenu : Actes du colloque "Ecologie et biogéographie alpines" de septembre 1990 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=138161
in Revue valdôtaine d'histoire naturelle > 48 (suppl.) (1994) . - 65-72Adamakopoulos-Matsoukas, Pénélope 1994 Contribution à l'étude de la répartition du Triton alpestre hellénique : Triturus alpestris veluchiensis. Revue valdôtaine d'histoire naturelle, 48(suppl.): 65-72.
Titre : Le cycle d'activité de Triturus alpestris : influence des facteurs externes Type de document : Imprimé Auteurs : F. Andreone ; C. Giacoma ; L. Cavallotto ; H. Francillon-Vieillor Année de publication : 1994 Article en page(s) : 81-92 Langues : Français (fre) Catégories : [CBNPMP-Thématique] Amphibiens Note de contenu : Actes du colloque "Ecologie et biogéographie alpines" de septembre 1990 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=138163
in Revue valdôtaine d'histoire naturelle > 48 (suppl.) (1994) . - 81-92Andreone, F., Giacoma, C., Cavallotto, L., Francillon-Vieillor, H. 1994 Le cycle d'activité de Triturus alpestris : influence des facteurs externes. Revue valdôtaine d'histoire naturelle, 48(suppl.): 81-92.
Titre : Dynamics of an emerging disease drive large-scale amphibian population extinctions Type de document : Imprimé Auteurs : Vance T. Vredenburg ; Roland A. Knapp ; Tate S. Tunstall ; Cheryl J. Briggs (1963-) Année de publication : 2010 Article en page(s) : 9689-9694 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude
[CBNPMP-Thématique] AmphibiensRésumé : Epidemiological theory generally suggests that pathogens will not cause host extinctions because the pathogen should fade out when the host population is driven below some threshold density. An emerging infectious disease, chytridiomycosis, caused by the fungal pathogen Batrachochytrium dendrobatidis (Bd) is directly linked to the recent extinction or serious decline of hundreds of amphibian species. Despite continued spread of this pathogen into uninfected areas, the dynamics of the host–pathogen interaction remain unknown. We use fine-scale spatiotemporal data to describe (i) the invasion and spread of Bd through three lake basins, each containing multiple populations of the mountain yellow-legged frog, and (ii) the accompanying host–pathogen dynamics. Despite intensive sampling, Bd was not detected on frogs in study basins until just before epidemics began. Following Bd arrival in a basin, the disease spread to neighboring populations at ≈700 m/yr in a wave-like pattern until all populations were infected. Within a population, infection prevalence rapidly reached 100% and infection intensity on individual frogs increased in parallel. Frog mass mortality began only when infection intensity reached a critical threshold and repeatedly led to extinction of populations. Our results indicate that the high growth rate and virulence of Bd allow the near-simultaneous infection and buildup of high infection intensities in all host individuals; subsequent host population crashes therefore occur before Bd is limited by density-dependent factors. Preventing infection intensities in host populations from reaching this threshold could provide an effective strategy to avoid the extinction of susceptible amphibian species in the wild. Lien pérenne : DOI : 10.1073/pnas.091411110 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150912
in Proceedings of the National Academy of Sciences of the United States of America > 107 (21) (May 2010) . - 9689-9694Vredenburg, Vance T., Knapp, Roland A., Tunstall, Tate S., Briggs, Cheryl J. (1963-) 2010 Dynamics of an emerging disease drive large-scale amphibian population extinctions. Proceedings of the National Academy of Sciences of the United States of America, 107(21): 9689-9694.Documents numériques
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Article (2010)URLFish as local stressors of Pyrenean high mountain lakes: Arrival process and impact on amphibians and other organisms / Alexandre Miró (2016)
Titre : Fish as local stressors of Pyrenean high mountain lakes: Arrival process and impact on amphibians and other organisms Type de document : Électronique Auteurs : Alexandre Miró Editeur : Universitat de Barcelona. Departament d'Ecologia Année de publication : 2016 Importance : 272 p. Catégories : [CBNPMP-Thématique] Amphibiens
[CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude
[CBNPMP-Thématique] Relations et interactions individus-espèces
[CBNPMP-Géographique] PyrénéesRésumé : Pyrenean high mountain lakes are naturally fishless due to natural barriers that have prevented the natural colonisation of fish species from lower streams. However, there have been numerous trout introductions to such ecosystems, both in historical and recent periods. Differing from other high mountain regions, some high mountain lakes of the Pyrenees were exploited traditionally for trout cultivation. This activity started at least centuries ago and lasted until 1950s, affecting approximately 25% of the lakes. Since 1950, and similar to other high mountain regions, a wave of modern introductions with exotic species has affected among 35% and 85% of the lakes depending on the valley. In recent decades, minnows have also been introduced, being present in 2000 in 27% of Pyrenean high mountain lakes, as a result of recreational fishing with livebait. The first part of the thesis was intended to provide an objective description of the fish introduction process in the Pyrenees. For that purpose we collected data on trout and minnow occurrence from 520 high mountain lakes >0.5 ha of the southern Pyrenees and quantified, by generalized additive models, which particular factors either environmental or anthropogenic, best explained their present distribution and as a result their lake conservation status. The distribution of Salmo trutta in the southern slope of the Pyrenees was best explained by both, anthropogenic factors and lake characteristics, while only anthropogenic factors linked to recreational fishing were associated with the distribution of the exotic trout Salvelinus fontinalis and Oncorhynchus mykiss. For the case of minnow occurrence, previous presence of trout in the lake was the most explanative variable, confirming its association with recreational fishing using them as livebait. Trout and minnow introductions can cause large ecological problems and ecosystem alterations in high mountain lakes and ponds, since both trout and minnows occupy the top of a lake’s food chain. In the second part of the thesis, we sampled 1736 Pyrenean high mountain lakes and ponds at different levels of intensity and investigated the effects of introduced fish on indicator faunal groups such as amphibians and conspicuous macroinvertebrates in the littoral, and crustaceans from the plankton. We also studied if there was a trophic cascade from fish to the littoral epilithic community of these ecosystems. Our results showed that fish presence was linked with the disappearance of most amphibian species and of most conspicuous macroinvertebrates. Minnows also showed sizeable impact on the pelagic habitat reducing the abundance of some herbivorous species of zooplankton that appeared to be unaffected by trout. In the case of amphibian species, we found that, although introduced fish had a high local impact, western-eastern patterns of some environmental variables are the main drivers of amphibian species distribution at Pyrenean range scale. In addition, we confirmed the presence of a littoral trophic cascade that define most of the characteristics of the littoral epilithon of Pyrenean high mountain lakes and ponds, through fish predation of tadpoles and hence, by a drastic reduction of grazing activity. Lien pérenne : Handle : 10803/384835 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150934 Miró, Alexandre , 2016. Fish as local stressors of Pyrenean high mountain lakes: Arrival process and impact on amphibians and other organisms. Universitat de Barcelona. Departament d'Ecologia, [S.l.]. 272 pp.Documents numériques
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Thèse (2016)URL
Titre : Impact of introduced fish on Common frog (Rana temporaria) close to its altitudinal limit in alpine lakes Type de document : Imprimé Auteurs : Rocco Tiberti ; Achaz von Hardenberg Année de publication : 2012 Article en page(s) : 303-307 Catégories : [CBNPMP-Thématique] Enjeux de conservation des lacs d'altitude
[CBNPMP-Thématique] Amphibiens
[CBNPMP-Thématique] Relations et interactions individus-espèces
[CBNPMP-Géographique] AlpesRésumé : Alien fish species have been introduced into naturally fishless mountain lakes worldwide, with negative consequences for native fauna. This study describes the impact of introduced Brook trout (Salvelinus fontinalis) on Common frog (Rana temporaria) in the Gran Paradiso National Park (Western Italian Alps). We conducted an extensive, six years long (2006-2011) monitoring campaign over 12 fishless and 8 stocked lakes, close to the new altitudinal limit of R. temporaria (2811 m a.s.l.). This new altitudinal limit is reported for the first time in this study. The presence of introduced fish was a factor of ecological exclusion, negatively affecting the presence of frogs and compromising the suitability of alpine lakes as breeding sites. These results are likely to depend on larval predation or to selective avoidance of stocked lakes by R. temporaria. Eradication of introduced fish is proposed as a conservation measure to recover amphibian populations in alpine lake ecosystems. Lien pérenne : DOI : 10.1163/156853812X634044 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=150918
in Amphibia-reptilia > 33 (2012) . - 303-307Tiberti, Rocco, Hardenberg, Achaz von 2012 Impact of introduced fish on Common frog (Rana temporaria) close to its altitudinal limit in alpine lakes. Amphibia-reptilia, 33: 303-307.Documents numériques
Article (2012)URL
