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      Testing multiple pathways for impacts of the non-native Black-headed WeaverPloceus melanocephaluson native birds in Iberia in the early phase of invasion

      , ,
      Ibis
      Wiley-Blackwell

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          Nonsynchronous Spatial Overlap of Lizards in Patchy Habitats

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            A niche for neutrality.

            Ecologists now recognize that controversy over the relative importance of niches and neutrality cannot be resolved by analyzing species abundance patterns. Here, we use classical coexistence theory to reframe the debate in terms of stabilizing mechanisms (niches) and fitness equivalence (neutrality). The neutral model is a special case where stabilizing mechanisms are absent and species have equivalent fitness. Instead of asking whether niches or neutral processes structure communities, we advocate determining the degree to which observed diversity reflects strong stabilizing mechanisms overcoming large fitness differences or weak stabilization operating on species of similar fitness. To answer this question, we propose combining data on per capita growth rates with models to: (i) quantify the strength of stabilizing processes; (ii) quantify fitness inequality and compare it with stabilization; and (iii) manipulate frequency dependence in growth to test the consequences of stabilization and fitness equivalence for coexistence.
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              Avian extinction and mammalian introductions on oceanic islands.

              The arrival of humans on oceanic islands has precipitated a wave of extinctions among the islands' native birds. Nevertheless, the magnitude of this extinction event varies markedly between avifaunas. We show that the probability that a bird species has been extirpated from each of 220 oceanic islands is positively correlated with the number of exotic predatory mammal species established on those islands after European colonization and that the effect of these predators is greater on island endemic species. In contrast, the proportions of currently threatened species are independent of the numbers of exotic mammalian predator species, suggesting that the principal threat to island birds has changed through time as species susceptible to exotic predators have been driven extinct.
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                Author and article information

                Journal
                Ibis
                Ibis
                Wiley-Blackwell
                00191019
                April 2014
                April 2014
                : 156
                : 2
                : 355-365
                Article
                10.1111/ibi.12144
                fd52b3f4-7fa3-4b8e-802b-a897d9441ae5
                © 2014

                http://doi.wiley.com/10.1002/tdm_license_1.1

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