1,721,221 research outputs found
Amphibiens des sources et galeries drainantes en territoire préalpin : l’exemple du Mont Barro et du Mont de Brianza (Lombardie, Italie)
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Batracofauna delle gallerie drenanti
No full textQuesto lavoro illustra i dati raccolti durante una ricerca che, tra il 2002 e il 2007, ha interessato 7 gallerie drenanti di due aree protette lombarde quali il Parco Regionale del Monte Barro e l’Area di Rilevanza Ambientale “San Genesio-Colle Brianza” ed ha avuto lo scopo di studiarne la batracofauna. La specie più legata a tali ambienti, anche per la riproduzione, è risultata S. s. salamandra
Les nouvelles découvertes de Rana pyrenaica Serra-Cobo,1993 (Anura : Ranidae) et la limite occidentale de l’espèce
No full textRole of cave features for aquatic troglobiont fauna occurrence : effects on "accidentals" and troglomorphic organisms distribution
Full text linkSubterranean aquatic habitats may be of particular interest from the zoological point of view. Most of the studies dealing with aquatic troglobiont fauna focus on troglobionts, such as organisms spending their entire life cycle in caves. Few studies are dedicated to non obligate cave dwellers whose occurrence is usually considered as accidental or random. The focus of this paper is on identifying the role played by cave features in the occurrence of aquatic troglobiont fauna and assessing the relationship between species with and without troglomorphic features and their cave habitat requirements. Organisms' occurrence and environmental features were assessed during a repeated survey of all the caves occurring in a karstic valley of north-western Italy. We surveyed 39 natural caves from March to December 2013 sampling the waterbodies inside them for fire salamander larvae and invertebrates occurrence. 11 aquatic taxa were recorded during this study including 2 aquatic troglobiont species, Niphargus ambulator Karaman, 1975 and Dendrocoelum sp. n. All the taxa did not occur randomly. Aquatic troglobionts preferred deep and dark caves while other non obligate cave dweller occurred in shallower and brighter caves. The most important variables assessing distribution within caves were distance from the entrance and the temperature variation range of the pools. The occurrence of troglomorphic organisms was positively affected by pool distance from the cave entrance and pool area
Dry stone walls favour biodiversity : a case-study from the Appennines
No full textOne of the classical and traditional wall typology built in agricultural or pastoral landscapes are dry stone walls (walls built only of stones without concrete). These vertical surfaces are expected to increase habitat heterogeneity and to play an important role for biodiversity. This study focused on two groups of organisms: amphibians, represented by the rock-dwelling salamander Hydromantes strinatii, that are expected to use walls mainly as shelters, and molluscs, which use of walls may be affected mainly by the trophic resources available. A mountain area of the northern Appennines (NW-Italy) was surveyed to assess the differences between dry stone walls and the wall typologies in terms of morphology, surrounding landscape and salamander and mollusc occurrence; the relationships between wall typology features and salamander and mollusc distribution were assessed. Dry stone walls were more heterogeneous than concrete walls and hosted more lichens than natural rocky walls. They were more used by H. strinatii juveniles than the other walls and played an important role for their distribution. They were positively related to the occurrence of several molluscan species, including species with high ecological plasticity and rock-dwelling species. Among wall features, the most important for molluscs species distribution was vegetation cover, followed by lichen cover and heterogeneity, confirming the importance of trophic content for mollusc exploitation, while vegetated without concrete walls hosted higher number of species. The results suggest that dry stone walls can be important for fauna biodiversity and should be maintained and preserved as a part of landscape management
Distribution of the triclad Polycelis felina in Aezkoa mountains : effect of streams biotic features
No full textThe study of freshwater invertebrates composing macrobenthos communities of stream habitats can be of great importance for both ecological and conservational purposes. In this paper we analyse the distribution of the triclad Polycelis fauna in western Pyrenees along the Aezkoa Mountains where forests and pastures prevail. We found a relatively wide distribution of the species that was affected mainly by stream biotic characteristics, in particular by fish occurrence and gammarid abundance. These factors in a poorly urbanised area can reflect the importance of the well-structured community for the presence of P felina and its role as a bioindicator
Recherches sur Triturus alpestris alpestris (Laurenti, 1768) dans les milieux humides des bassins hydrographiques de la Doire de La Thuile et du torrent d’Arpy : communication d’une nouvelle station
No full textCaratteristiche ecologiche dei siti riproduttivi di Anfibi nelle aree prealpine
No full textQuesto articolo illustra i dati raccolti nel corso di una decennale ricerca i cui obiettivi principali sono stati quelli di caratterizzare i biotopi umidi utilizzati come siti riproduttivi da parte degli Anfibi in un’area prealpina, confrontandone le principali caratteristiche ecologiche (tipologia, stagionalità, origine artificiale o naturale, ambiente circostante) e l’utilizzo da parte delle diverse specie, e disporre di un elenco completo e aggiornato dei siti riproduttivi presenti nell’Area di Rilevanza ambientale «San Genesio – Colle Brianza» (Lombardia–Italia) nella quale non erano mai stati studiati prima di tale ricerca. Complessivamente in tale area, che si estende per circa 40 km2, sono stati rinvenuti 89 siti riproduttivi utilizzati da 9 specie di Anfibi, delle quali la più diffusa è Salamandra s. salamandra. La maggior parte dei siti rinvenuti è situata in ambiente boschivo, ma è di solito utilizzata per la riproduzione da solo una specie, mentre meno abbondanti sono i siti in aree agricole che però sono utilizzati da un numero maggiore di specie. Le preferenze delle specie più diffuse, quali S. s. salamandra, Rana temporaria e R. dalmatina, sono analizzate in dettaglio nel testo allo scopo di ampliare le conoscenze ecologiche a esse relative.
This work shows the results of a ten–year research that had the purpose of describing damp biotopes used as breeding sites by amphibians in a Pre–Alpine area comparing their main ecological characteristics (typology, seasonality, natural or artificial origin, landscape features) and of obtaining the complete list of amphibians breeding sites in the area of environmental importance «San Genesio – Colle Brianza» (Lombardy – Italy) where they haven’t been studied before. In the whole in the area, that has a surface of 40 km2, 89 damp biotopes, used for breeding by 9 species of Amphibians, have been found. Salamandra s. salamandra is the more diffused taxon in the studied area. The biggest percentage of the damp biotopes is situated in wooded areas but houses often the reproduction of only one species, while the sites found in agricultural areas are less abundant but are used by more species. The preferences of the more diffused species, such as S. s. salamandra, Rana temporaria and R. dalmatina are described in detail in order to increase the knowledge about their ecology
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