Search results for "Aphanius fasciatu"
showing 3 items of 3 documents
Chromosomal location polymorphism of major rDNA sites in two Mediterranean populations of the killifih Aphanius fasciatus (Pisces: Cyprinodontidae)
2005
The chromosomes of the Mediterranean killifish, Aphanius fasciatus from two populations, the Lagoon of Venice (LV, 15 specimens) and the Lagoon ‘Stagnone di Marsala’ (Sicily) (SM, 48 specimens), have been investigated using conventional Ag-staining and fluorescent in situ hybridization (FISH) with 18S rDNA probe. The two methods revealed variation in the number of major rDNA sites ranging from 8 to 14 (LV) and from 1 to 4 (SM) per individual. The fact that each individual possessed its own number of sites implies that observed variation was structural. Moreover, overlapping of silver staining and FISH patterns demonstrated that all ribosomal genes were transcriptionally active in each speci…
Estimation of dynamic energy budget parameters for the Mediterranean toothcarp (Aphanius fasciatus)
2014
Organisms adopt different sets of physiological, behavioural and morphological trade-offs in order to cope with natural environmental fluctuations. This has consequential rebounds on ecological processes and population dynamics. Such aspects become crucial for sex-dimorphic species, where sex-specific growth variation could mirror different tactics both in energy acquisition and investment between maximum female and male body size with cascading effects on population demography. To date, different approaches have been used in order to understand the causes of individual growth rate changes in ectotherm indeterminate growers, most of which failed. Here, we propose the use of a mechanistic mo…
Conferma della presenza di Aphanius fasciatus (Valenciennes, 1821) (Cyprinodontiformes Cyprinodontidae) nel bacino idrografico del Fiume Imera Meridi…
2009
Un’abbondante popolazione del Ciprinodontide autoctono Aphanius fasciatus è stata rinvenuta nel Fiume ImeraMeridionale ed in alcuni suoi affluenti. É così confermata la persistenza della specie nel sito, nonostante le pesanti alterazioni ambientali che hanno interessato il fiume e che avevano fatto ritenere A. fasciatus localmente estinto. Trattandosi di una delle poche popolazioni di Aphanius fasciatus sopravvissute nei corsi d’acqua siciliani e alla luce della notevole diversità genetica e morfologica riscontrata tra le differenti popolazioni siciliane di questo Ciprinodontide, la sopravvivenza di questa popolazione assume un’importante valenza conservazionistica.