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The enemy release hypothesis (ERH) predicts that the success of invasive species is caused by reduced enemy pressure in species’ introduced ranges. The ERH is a highly-cited explanation for invasion success, yet rigorous evidence is lacking for most species and ecosystems. Most evidence comes from observations of enemies in native and introduced ranges. These studies assess one aspect of the ERH—“enemy...
Die posttraumatische Belastungsstörung (PTBS) neigt zur Chronifizierung und weist eine hohe Komorbidität mit anderen psychiatrischen Störungen auf. Im Unterschied zu den meisten psychiatrischen Erkrankungen existiert bei der PTBS mit dem auslösenden Trauma ein klar definierter, ätiologischer Faktor. Mit wachsendem Kenntnisstand zur Pathogenese der PTBS stellt sich daher die Frage nach einer effektiven...
To predict changes in species’ distributions due to climate change we must understand populations at the poleward edge of species’ ranges. Ecologists generally expect range shifts under climate change caused by the expansion of edge populations as peripheral conditions increasingly resemble the range core. We tested whether peripheral populations of two contrasting butterflies, a small-bodied specialist...
. We compare results of field study and model analysis of two butterfly populations to evaluate the importance of alternative mechanisms causing changes in abundance. Although understanding and predicting population fluctuations is a central goal of population ecology, it is not often achieved because long-term abundance data are available for few populations in which mechanisms causing fluctuations...
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