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      Natural biological control of Halyomorpha halys by native egg parasitoids: a multi-year survey in northern Delaware

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          The Ecology of Invasions by Animals and Plants

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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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              Elton Revisited: A Review of Evidence Linking Diversity and Invasibility

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                Author and article information

                Contributors
                (View ORCID Profile)
                Journal
                Journal of Pest Science
                J Pest Sci
                Springer Science and Business Media LLC
                1612-4758
                1612-4766
                September 2017
                May 8 2017
                September 2017
                : 90
                : 4
                : 1143-1158
                Article
                10.1007/s10340-017-0868-6
                31fcac34-dd49-48aa-ac4d-aa605d5f4608
                © 2017

                http://www.springer.com/tdm

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