Species invasions. 鄭先祐 (Ayo) 台南大學 環境與生態學院 院長 Japalura@hotmail.com. Contents . What are the conservation implications of introduced species? What are the impacts of invasions? What factors determine whether a nonnative species becomes invasive? How are species introduced?
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台南大學 環境與生態學院 院長
Brown tree snake
Mariana fruit bat
Fig. 9.4 Percent of native unionid mussels recently dead as a function of the relative wet weight of introduced European zebra mussels attached to their shells.
Fig. 9.9 the invasion process.
Disturbance – either natural or anthropogenic – may make a community more easily invadable, particularly for plants.
The biotic resistance and disturbance hypotheses are complementary if we view them from the perspective of resource availability.
A species-rich community with intense competition may be less invadable until disturbance alters the availability of resources, either by providing new resources, or by reducing the effectiveness of competitors, allowing an invader to establish (Fig. 9.14)
Fig. 9.14 A representation of the conceptual theory that increased resource availability increases a plant community’s susceptibility to invasion.