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      Predicting the invasion risk by the alien bee-hawking Yellow-legged hornet Vespa velutina nigrithorax across Europe and other continents with niche models

      , , , , , ,
      Biological Conservation
      Elsevier BV

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          Introduced species and their missing parasites.

          Damage caused by introduced species results from the high population densities and large body sizes that they attain in their new location. Escape from the effects of natural enemies is a frequent explanation given for the success of introduced species. Because some parasites can reduce host density and decrease body size, an invader that leaves parasites behind and encounters few new parasites can experience a demographic release and become a pest. To test whether introduced species are less parasitized, we have compared the parasites of exotic species in their native and introduced ranges, using 26 host species of molluscs, crustaceans, fishes, birds, mammals, amphibians and reptiles. Here we report that the number of parasite species found in native populations is twice that found in exotic populations. In addition, introduced populations are less heavily parasitized (in terms of percentage infected) than are native populations. Reduced parasitization of introduced species has several causes, including reduced probability of the introduction of parasites with exotic species (or early extinction after host establishment), absence of other required hosts in the new location, and the host-specific limitations of native parasites adapting to new hosts.
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            The Causes and Consequences of Ant Invasions

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              The German bee monitoring project: a long term study to understand periodically high winter losses of honey bee colonies

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                Author and article information

                Journal
                Biological Conservation
                Biological Conservation
                Elsevier BV
                00063207
                September 2011
                September 2011
                : 144
                : 9
                : 2142-2150
                Article
                10.1016/j.biocon.2011.04.009
                e9e3dec0-53ac-49df-aef8-e8b415a66adb
                © 2011

                http://www.elsevier.com/tdm/userlicense/1.0/

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