Search results for "ZOOLOGIA"
showing 10 items of 803 documents
Anti biofilm activity of Paracentrotus lividus coelomocytes
2010
Dati preliminari sulla variabilità della regione di controllo in Parapenaeus longirostris e Aristeus antennatus.
2007
A molecular analysis of some Eastern Atlantic grouper from the Epinephelus and Mycteroperca genus
2005
Abstract Mitochondrial cytochrome b (397 bp) and 16S rDNA (516 bp) sequences analysis was used to investigate the phylogenetic relationships among some Eastern Atlantic Epinephelinae species. Six species of Epinephelus ( E. aeneus , E. caninus , E. costae , E. haifensis , E. marginatus and E. tauvina ) and two species of Mycteroperca ( M. rubra and M. fusca ) were analysed. Neighbour-joining and maximum-parsimony analysis support the paraphyletic grouping of the Epinephelus and Mycteroperca analysed. The maximum pairwise nucleotide divergence value in cyt b among all taxa was 0.196 between E. aeneus and E. marginatus and the minimum value was 0.006 between E. costae and M. rubra . Meanwhile…
Great tit (Parus major) breeding in fire-prone oak woods: differential effects of post-fire conditions on reproductive stages
2011
Wildfires negatively affect the overall reproductive success of several woodland avian species, but there is scarce information about which stages of the nesting cycle are specifically affected. We conducted a 3-year study to identify the effects of fire on the reproductive parameters of the great tit (Parus major) and the survival of its nests at different stages of the nesting cycle. We recorded the occupancy rate, clutch and brood size, hatching, fledging and nesting success in nest boxes placed on study plots with different post-fire age. By examining the post-fire succession, we analysed the survival of eggs and nestlings under predation risks. As the forest matured after a wildfire, …
El tamaño importa: tractos digestivos y nematodos Pharyngodonidae parásitos de reptiles.
2014
En conclusión podemos afirmar que el notable tamaño del colon de los lagartos canarios resulta un microhábitat adecuado para albergar amplias faunas de nematodos oxiúridos de manera similar a lo que se observa en iguánidos y tortugas terrestres.
Taxonomic revision of the Atlantic and Pacific species of Ligophorus (Monogenea, Dactylogyridae) from mullets (Teleostei, Mugilidae) with the proposa…
2013
A revision of the Atlantic and Pacific species of Ligophorus Euzet et Suriano, 1977 based on abundant newly sampled material from mugilids of the Mediterranean Sea, Sea of Japan and South China Sea, as well as available type and voucher specimens, is presented. All 35 nominal species of Ligophorus known from the Atlantic and the Pacific waters are treated. Of them, 30 are considered valid, one incertae sedis (L. leporinus), one species inquirendae (L. chongmingensis), two junior synonyms (L. euzeti and L. gussevi) and one is transferred to another genus. Three new species of Ligophorus are described: L. triangularis, L. miroshnichenki, and L. rectus. An amended diagnosis of Ligophorus is gi…
Are there any distinct genetic sub-populations of sand smelt, Atherina boyeri (Teleostei: Atherinidae) along Italian coasts? Evidence from allozyme a…
2007
Two hundred and ninety-nine specimens of Atherina boyeri, collected from five Mediterranean sites (three from the open sea (Chioggia, Catania and Gaeta) and two from river mouths (the Birgi and S. Bartolomeo rivers) were analyzed in order to confirm previous genetic studies. Eigtheen loci were scored from 12 enzymatic systems, 3 of which were polymorphic: EST*, PGM* and PGI*. Mean Fst value (0.300, p< 0.05) indicated a high genetic heterogeneity. Pairwise Fst and genetic distance revealed that samples from the river mouths (Birgi and S. Bartolomeo) were grouped separately from the open sea samples (Catania, Chioggia and Gaeta). These results are in agreement with the most recent classificat…
Comparative Analysis of Lanner and Peregrine Trophic Niche in the Mediterranean
2017
Predators are highly sensitive to availability and changes of their prey, which are limiting factors for successful reproductive performances. We studied the diet of the increasing Peregrine falcon (F. p. brookei) and the declining Lanner falcon (F. b. feldeggii) populations in Sicily. The two species coexist in the same habitats of this large Mediterranean island and require similar feeding resources. We described the type and diversity of prey taken by both species in order to understand whether differences in foraging ecology could explain their diverse population status. During 2014-2016, we collected prey remains and pellets in 15 Peregrine and 6 Lanner nests and we compared the curren…
Controlled uptake of PFOA in adult specimens of Paracentrotus lividus and evaluation of gene expression in their gonads and embryos
2023
AbstractPerfluorooctanoic acid (PFOA) has been largely used in the manufacturing industry but a few years ago it turned out to be a dangerous pollutant which is now of concern for terrestrial and aquatic environments. Here, we investigated the bioaccumulation of PFOA in the sea urchin Paracentrotus lividus after exposure to different concentrations of the pollutant for 28 days. We observed rapid uptake of PFOA in the coelomic fluid collected weekly during the exposure period and high bioaccumulation in gonads at the end of the experiment. Interestingly, animals were also able to fast depurate when relocated to a clean environment. In addition, to assess the effect of PFOA on sea urchins’ ph…