8 - Community interactions

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Unformatted text preview: Ottawa Minimum numbers of island groups where major problem animals have been introduced (excluding humans) Species Herbivore Predator Goat 45 Rabbit 33 Pig 51 51 Cat 65 Rattus rattus 66 Rattus norvegicus 45 Rattus exulans 39 Mongoose 6 L8.32 Bio 3115 Université d’Ottawa / University of Ottawa M8..16 BIO 3115 Conservation Biology 3/11/2014 The changing face of plant biodiversity in North America In some locations, exotics now represent > 25% of plant species movement has occurred from coastal regions into interior and from south to north at present, only most northerly regions have been unaffected. 1900 1996 L8.33 Bio 3115 Université d’Ottawa / University of Ottawa In southeastern Ontario wetlands, exotic and native wetland plant species richness are positively correlated … … which suggests that areas that are good for native species, are also good for exotics. Log10 native richness Do exotics influence native wetland plant diversity? 2.4 2.2 2.0 1.8 1.6 0.0 0.4 0.8 1.2 Log10 exotic richness L8.34 Bio 3115 Université d’Ottawa / University of Ottawa M8..17 BIO 3115 Conservation Biology 3/11/2014 The effect of exotic community dominants on native richness is the same as the effect of native community dominants So, no evidence that native biodiversity is negatively affected by exotic invasives. Native species richness index Do exotics influence native wetland 0.4 plant diversity? Typha 0.0 -0.4 0.4 P. arundinacae 0.0 -0.4 0 1 2 3 4 5 Abundance class L8.35 Bio 3115 Université d’Ottawa / University of Ottawa M8..18...
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