Seascape Genetics of a Globally Distributed, Highly Mobile Marine Mammal: The Short-Beaked Common Dolphin (Genus Delphinus)

Identifying which factors shape the distribution of intraspecific genetic diversity is central in evolutionary and conservation biology. In the marine realm, the absence of obvious barriers to dispersal can make this task more difficult. Nevertheless, recent studies have provided valuable insights into which factors may be shaping genetic structure in the world's oceans. These studies were, however, generally conducted on marine organisms with larval dispersal. Here, using a seascape genetics approach, we show that marine productivity and sea surface temperature are correlated with genetic structure in a highly mobile, widely distributed marine mammal species, the short-beaked common dolphin. Isolation by distance also appears to influence population divergence over larger geographical scales (i.e. across different ocean basins). We suggest that the relationship between environmental variables and population structure may be caused by prey behaviour, which is believed to determine common dolphins' movement patterns and preferred associations with certain oceanographic conditions. Our study highlights the role of oceanography in shaping genetic structure of a highly mobile and widely distributed top marine predator. Thus, seascape genetic studies can potentially track the biological effects of ongoing climate-change at oceanographic interfaces and also inform marine reserve design in relation to the distribution and genetic connectivity of charismatic and ecologically important megafauna

METODICHE DI ESTRAZIONE DEL PILOTA DOPO INCIDENTE IN COMPETIZIONI AUTOMOBILISTICHE ("ESTRICAZIONE") IERI ED OGGI

L'articolo tratta l'argomento dell'assistenza ai piloti automobilistici coinvolti in un incidente durante una gara. Spesso un intervento condotto in modo consapevole da personale esperto può contribuire a risolvere positivamente situazioni anche gravi

The endangered status of dugongs Dugong dugon around Mayotte (East Africa, Mozambique Channel) assessed through interview surveys

The status of dugongs Dugong dugon around Mayotte in the Mozambique Channel was assessed from interviews with artisanal fishers conducted in 2007, along with the collation of opportunistic sighting information from tour operators between 2002 and 2011. In all, 106 of the 406 fishers interviewed (26%) had observed a live dugong at least once during their lifetime, and among these sightings 18 were made in 2007. Nine fishers stated that they observed on one occasion people selling dugong meat on the beach of their village, six fishers admitted that they caught a dugong themselves and three had caught more than one dugong during their lifetime. Tour operators reported 78 dugong sightings between 2002 and 2011, and among these 15 were cow–calf pairs. Since the late 1990s, no deliberate hunting was reported but four bycatch deaths due to entanglement in artisanal fishing nets were reported. We concluded that the current dugong population size is likely to be small but reproduction still occurs and that entanglement in artisanal fishing nets remains the major threat to the species in Mayotte.Keywords: bycatch, conservation, sirenians, South-West Indian OceanAfrican Journal of Marine Science 2013, 35(1): 111–11

Possibilite de realisation industrielle et evaluation de catheters, tubes, et poches souples a partir de COMPOUND PVC contenant des additifs silicones

Available from INIST (FR), Document Supply Service, under shelf-number : AR 16284 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFonds de la Recherche et de la Technologie (FRT), 75 - Paris (France)FRFranc

Intraspecific dietary variation in the short-beaked common dolphin Delphinus delphis in the Bay of Biscay: importance of fat fish.

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Intraspecific dietary variation in the short-beaked common dolphin Delphinus delphis in the Bay of Biscay: importance of fat fish.

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