Consulta: subjectFacets:"Eaux saumâtres"
Registros recuperados: 4
Data/hora: 08/06/2024 10:14:19

Genetic diversity and environmental stress in Italian populations of the cyprinodont fish Aphanius fasciatus
Provedor de dados: 5
Autores: Cimmaruta, R; Scialanca, F; Luccioli, F; Nascetti, G.
Allozyme electrophoresis has been used to analyse the genetic structure of ten populations of the killifish, Aphanius fasciatus, sampled from Italian coastal brackish lagoons or salterns. The goal of the study was to compare the genetic structure of samples obtained from habitats characterised by environmental stress of different kinds, with the aim of gaining a better understanding of the relationships between the genetic variation of natural populations and environmental disturbance, either natural or man-made. Therefore, the sampling scheme has been planned to provide samples from both brackish habitats, characterised by natural stress with seasonal marked fluctuations of chemical and physical parameters, and from coastal lagoons suffering from a high...
Tipo: Text
Palavras-chave: Aphanius fasciatus; Hétérozygotie; Allozymes; Eaux saumâtres; Stress du milieu; Aphanius fasciatus; Heterozygosity; Allozymes; Brackish waters; Environmental stress.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00322/43290/43025.pdf

Small-scale morphological and genetic differentiation in the Mediterranean killifish Aphanius fasciatus (Cyprinodontidae) from a coastal brackish-water pond and an adjacent pool in northern Sardinia
Provedor de dados: 5
Autores: Maltagliati, F; Domenici, P; Fosch, Cf; Cossu, P; Casu, M; Castelli, A.
Two samples of Aphanius fasciatus collected in the Pilo pond (northern Sardinia, Italy) and in an adjacent pool of small surface area were analysed morphologically (235 individuals) and genetically (a subsample of 58 individuals). The aims of the present study were (i) to test the hypothesis that different predation pressures may be associated with morphological and/or genetic differences between samples from each habitat and (ii) to assess the level of divergence between the two populations. Morphological analysis was based on the relative size of fins because it has been shown to be associated with predation pressure. The relative caudal fin area (caudal fin area/total body surface) was smaller in specimens from the pool, in both males and females,...
Tipo: Text
Palavras-chave: Morphologie; Taille relative des nageoires; Variation génétique; Divergence de populations; Eaux saumâtres; Morphology; Relative fin size; Genetic variation; RAPDs; Population divergence; Brackish-water habitats.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00322/43291/43026.pdf

Life cycles in brackish habitats: adaptive strategies of some polychaetes from the Venice lagoon
Provedor de dados: 5
Autores: Prevedelli, D; Simonini, R.
The life cycle of five species of polychaetes living in the Venice lagoon is analysed with the aim of finding out if some traits can be interpreted as an adaptation to brackish environments. The studied species are characterized by different sizes and reproductive strategies. Marphysa sanguinea is a large-sized, annual iteroparous species belonging to the Eunicidae family that reproduces without epitokal modification. Perinereis cultrifera and P. rullieri are large-sized semelparous species belonging to the Nereididae family: the first reproduce with epitokal metamorphosis, the second do not. Ophryotrocha labronica and Dinophilus gyrociliatus are small iteroparous species with semi-continuous reproduction belonging to the Dorvilleidae and Dinophilidae...
Tipo: Text
Palavras-chave: Cycles vitaux; Eaux saumâtres; Stratégies de reproduction; Polychètes; Lagune de Venise; Life cycle; Brackish water; Reproductive strategies; Polychaeta; Venice lagoon.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00322/43287/43022.pdf

Spatial organisation of macrozoobenthic communities in response to environmental factors in a coastal lagoon of the NW African coast (Merja Zerga, Morocco)
Provedor de dados: 5
Autores: Bazairi, H; Bayed, A; Glemarec, M; Hily, C.
Merja Zerga lagoon, located on the Moroccan Atlantic coast, is a site of international value (Ramsar Site) in terms of its ornithological diversity. However, the lagoon is heavily exploited for its clams and fishes. In an effort to further understanding of lagoon ecosystems, and thus to facilitate the management and conservation of their resources, an ecological survey of its benthic component was carried out. Benthos is a valuable food source for birds, fishes and humans. This work involved identifying the macrozoobenthic communities in the lagoon and assessing their spatial distribution. The study was based on monthly sampling of the intertidal zone and seasonal sampling in subtidal zone, over a one-year period. In the intertidal zone, salinity and...
Tipo: Text
Palavras-chave: Intertidal; Subtidal; Eaux saumâtres; Biodiversité du macrozoobenthos; Succession écologique; Intertidal; Subtidal brackish water environments; Macrozoobenthic biodiversity; Ecological succession.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00321/43239/42968.pdf