1,721,076 research outputs found
Trophic niche of cave populations of Speleomantes italicus
No full textVignoli, Leonardo, Caldera, Federico, Bologna, Marco A. (2006): Trophic niche of cave populations of Speleomantes italicus. Journal of Natural History 40 (29-31): 1841-1850, DOI: 10.1080/00222930600973598, URL: http://dx.doi.org/10.1080/0022293060097359
BIRD ASSEMBLAGES IN A STRUCTURALLY SIMPLIFIED MEDITERRANEAN SANDY BEACH: AN ANALYSIS AT SPATIAL AND TEMPORAL LEVEL
No full textStudies on the bird richness and abundance patterning in sandy coastal areas are almost neglected. A better knowledge of bird assemblage structure could permit the developing of appropriate conservation strategies in these key ecosystems. In this study, we aimed to test the hypothesis that a patchy and structurally oversimplified ecosystem, as a Mediterranean sandy beach, may host bird assemblages highly variable in space and time and relatively poor in richness and abundance, whose structure should be therefore affected by chance. In 2007 a transect laid along a sandy beach was carried out, allowing to analyse the data temporally (six 2-month periods) and spatially (three longitudinal habitat types), either at single species or assemblage level. We observed a total of 25 bird species. Bird assemblages showed a taxonomical, phenological and ecological heterogeneity. In late autumn-winter the beach hosted the richest assemblage, in summer-autumn the lowest. Differences in mean values among 2-month periods were significant for species richness. Beaches represent patchy ecosystems with a different availability of resources in space and time. The presence of vegetation and linked trophic resources presumably permits the occurrence of a large variation in resource availability that determines a high turnover for different species along the temporal and spatial niche. Finally, we observed an inverse relationship between human presence and species richness.Assemblages d’oiseaux sur une plage sableuse méditerranéenne structuralement simplifiée : analyse spatio-temporelle.
Les études des patterns de richesse et d’abondance spécifique sur les côtes sableuses sont quasi négligées. Une meilleure connaissance de la structure des assemblages d’oiseaux pourrait permettre le développement de stratégies de conservation appropriées dans ces écosystèmes-clés. Dans la présente étude, nous nous proposons de tester l’hypothèse qu’un écosystème aussi morcelé et structuralement aussi simplifié qu’une plage sableuse méditerranéenne pourrait abriter des assemblages d’oiseaux hautement variables dans le temps et dans l’espace et relativement pauvres en richesse et abondance, dont la structure serait donc affecté par le hasard. En 2007 un transect a été établi le long d’une plage sableuse afin d’analyser les données temporelles (six périodes de deux mois) et spatiales (trois types d’habitats longitudinaux) au niveau d’une espèce ou d’un assemblage. Nous avons observé un total de 25 espèces. Les assemblages d’oiseaux ont montré une hétérogénéité taxinomique, phénologique et écologique. La plage hébergeait l’assemblage le plus riche en fin d’automne-hiver, le plus pauvre en été-automne. Les valeurs moyennes de la richesse spécifique se sont avérées significativement différentes selon la période de deux mois. Les plages représentent des écosystèmes morcelés avec des disponibilités en ressources différentes dans le temps et dans l’espace. La présence de végétation et des ressources trophiques associées permet vraisemblablement une grande variation de la disponibilité des ressources qui détermine un fort renouvellement des diverses espèces le long de la niche spatio-temporelle. Enfin, nous avons observé une relation inverse entre la présence humaine et la richesse spécifique.Battisti Corrado, Luiselli Luca, Vignoli Leonardo. Bird assemblages in a structurally simplified Mediterranean sandy beach: an analysis at spatial and temporal level. In: Revue d'Écologie (La Terre et La Vie), tome 67, n°1, 2012. pp. 63-70
Distribution, ecology and conservation of Archaeolacerta bedriagae in Sardinia (Reptilia, Lacertidae)
No full textThis paper is a revision of the distribution of this endemic species in Sardinia, based on both literature and unpublished records, and focused to assess the conservation status of its populations. Two sampling sites were selected for a comparative analysis: in the mountain site, a population density twenty times higher than that found at sea level site was estimated. Underestimation is possible due to the elusivity of this species which usually occurs in rocky habitats where observation is difficult. Some conservation actions were proposed
Faunistic and ecological aspects of Archaeolacerta bedriagae Camerino, 1885 in Sardinia and conservation strategy (Reptilia, Lacertidae)
No full textCommunity structure and resource partitioning in a community of amphibians (Latium, Italy)
No full textA community of amphibians was studied by the identification of the ecological role and the diet of each species. The stomach content was investigated by the stomach flushing method and samples were conducted throughout ther year to define the biological cycle of the species
Il ruolo degli studi zoologici di campo e degli atlanti faunistici nella definizione delle reti ecologiche
No full textElemento basale e strutturale per la costruzione delle ecoreti è l’analisi faunistica e delle comunità animali, così come quella floristica e vegetazionale. La ricerca di base in campo ecologico e, nello specifico, quella zoologica, apporta oltre al contributoconoscitivo intrinseco, anche quello descrittivo ed interpretativo, in termini di funzionalità, imprescindibilinella caratterizzazione del territorio in vista di interventi progettuali di pianificazione e di gestione. La redazione di reti ecologiche non può prescindere dalla presenza di operatori specialisti, quali zoologi fauniri ed ecologi animali, e non può essere delegata ad altre professionalità. Un altro passo da effettuare è di superare l’attuale scollegamento tra la costruzione di reti potenziali e di reti effettive. I dati di presenza attuale e pregressa delle specie animali, così come l’analisi della “crono-corologia” delle popolazioni e delle specie, tramite la costruzione di data-base, devono essere interfacciati, attraverso sistemi GIS, con le informazioniambientali, presenti e “storiche”, che definiscono le idoneità ambientali per le popolazioni, le specie, le guild. La relazione tra idoneità ambientale e la presenza reale della fauna in un’area, produce le due principali proprietà di una rete ecologica: la sua potenzialità e la sua effettività, identificata nella reale presenza degli elementi faunistici sul territorio. Operativamente conviene operare su: (a) taxocenosi, comunità di gruppi tassonomici selezionati in base al loro ruolo ecologico, alla disponibilità di tassonomi o alla facilità di riconoscimento; (b) “guilds”, vale a dire insiemi di specie legate da valenze ecologiche comuni per undeterminato ecosistema; (c) specie campione, stenoecie o minacciate, che permettano in tempi e con sforzi ragionevoli, di individuare i problemi funzionali dell’area in esame, nonché di formulare ipotesi gestionali, soprattutto in una fase preliminared’indagine
The effects of temperature and pH on the embryonic development of two species of Triturus
No full textDIETARY PATTERNS AND OVERLAP IN AN AMPHIBIAN ASSEMBLAGE AT A POND IN MEDITERRANEAN CENTRAL ITALY RID F-2663-2011
No full textFlight initiation distance in relation to substratum type, sex, reproductive status and tail condition in two lacertids with contrasting habits
No full textNicchia trofica del tritone alpino (Triturus alpestris apuanus Laurenti, 1768)in uno stagno montano delle Alpi Liguri: variazioni stagionali della dieta e differenze tra sessi e stadi vitali.
No full textThe diet of the alpine newt was studied through the stomach flushing method in order to define its ecological role within the pond community
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