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Early onset of secondary extinctions in ecological communities following the loss of top predators
Author(s) -
Borrvall Charlotte,
Ebenman Bo
Publication year - 2006
Publication title -
ecology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.852
H-Index - 265
eISSN - 1461-0248
pISSN - 1461-023X
DOI - 10.1111/j.1461-0248.2006.00893.x
Subject(s) - predation , ecology , extinction (optical mineralogy) , apex predator , trophic cascade , trophic level , ecosystem , extinction debt , biology , local extinction , species richness , biodiversity , predator , habitat destruction , population , biological dispersal , paleontology , demography , sociology
The large vulnerability of top predators to human‐induced disturbances on ecosystems is a matter of growing concern. Because top predators often exert strong influence on their prey populations their extinction can have far‐reaching consequences for the structure and functioning of ecosystems. It has, for example, been observed that the local loss of a predator can trigger a cascade of secondary extinctions. However, the time lags involved in such secondary extinctions remain unexplored. Here we show that the loss of a top predator leads to a significantly earlier onset of secondary extinctions in model communities than does the loss of a species from other trophic levels. Moreover, in most cases time to secondary extinction increases with increasing species richness. If local secondary extinctions occur early they are less likely to be balanced by immigration of species from local communities nearby. The implications of these results for community persistence and conservation priorities are discussed.