16 124 897 livres à l’intérieur 175 langues
2 047 051 livres numériques à l’intérieur 101 langues
Cela ne vous convient pas ? Aucun souci à se faire ! Vous pouvez renvoyer le produit dans les 30 jours
Impossible de faire fausse route avec un bon d’achat. Le destinataire du cadeau peut choisir ce qu'il veut parmi notre sélection.
Politique de retour sous 30 jours
Carp (Cyprinus carpio) are alien fish §typically associated with degraded freshwater §ecosystems. This study explored local impacts of §carp and landscape patterns in carp distribution to §develop conceptual models of ecological impact by §carp. Field experimentation showed that carp impacts §are more carp size-dependent than previously §described (eg in determining total algal biomass). §Additionally, patterns of carp distribution, biomass §density and recruitment were explored among the §rivers of New South Wales (Australia) in relation to §their physical habitat. The populations with a size §structure and biomass density most likely to cause §ecological degradation occurred at altitudes from §200 to 500 m. Furthermore, the regulation of river §flows does not always favour carp recruitment, §especially during drought. Nevertheless, invasion by §alien carp in Australia and elsewhere in the world §is most successful in streams with formerly highly §variable flows that are now subject to flow §regulation. Furthermore, carp often enhance their §advantage in these waters through habitat §modification.