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Black rat does not bother Mediterranean seabirds
Date:10/2/2009

Human activities have meant invasive species have been able to populate parts of the world to which they are not native and alter biodiversity there over thousands of years. Now, an international team of scientists has studied the impact of the black rat on bird populations on Mediterranean islands. Despite the rat's environmental impact, only the tiny European storm petrel has been affected over time by its enforced cohabitation with the rat.

A European team has studied around 300 islands in the western Mediterranean, and has confirmed that the presence of the black rat (Rattus rattus) has an effect on the number of marine birds there. Mass colonisation by rats is damaging to the native biota of islands, leading to a 68% risk of extinction for procellariiforme seabirds (tube-nosed birds with webbed feet of three to four toes).

Although rats have been introduced into the islands of the Mediterranean over the past 2,000 years, "there has not been any recorded extinction of any seabird species since they first arrived on the islands in this basin", Lise Ruffino, lead author of the study and a researcher at the Mediterranean Institute of Ecology and Paleoecology (IMEP) at the Paul Czanne University in France, tells SINC.

The study, which has been published recently in Biological Invasions, has evaluated more than 50% of the islands in the western Mediterranean. The scientists found that only 31% of the small Mediterranean islands or islets (of less than five hectares) were rat-free. In fact, 99% of islands measuring more than 30 hectares have been invaded by black rats, and living alongside them has had a serious impact on the survival of four procellariiforme species.

Of the four species studied, Cory's shearwater (Calonectris diomedea diomedea), the Mediterranean shearwater (Puffinus yelkouan), the Balearic shearwater (Puffinus mauretanicus), and the European storm petrel (Hydrobates pelagicus melitensis). "The only
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Contact: SINC
info@plataformasinc.es
34-914-251-820
FECYT - Spanish Foundation for Science and Technology
Source:Eurekalert  

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