Abstract:
:There is large interspecific variation in the magnitude of population fluctuations, even among closely related species. The factors generating this variation are not well understood, primarily because of the challenges of separating the relative impact of variation in population size from fluctuations in the environment. Here, we show using demographic data from 13 bird populations that magnitudes of fluctuations in population size are mainly driven by stochastic fluctuations in the environment. Regulation towards an equilibrium population size occurs through density-dependent mortality. At small population sizes, population dynamics are primarily driven by environment-driven variation in recruitment, whereas close to the carrying capacity K, variation in population growth is more strongly influenced by density-dependent mortality of both juveniles and adults. Our results provide evidence for the hypothesis proposed by Lack that population fluctuations in birds arise from temporal variation in the difference between density-independent recruitment and density-dependent mortality during the non-breeding season.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Sæther BE,Grøtan V,Engen S,Coulson T,Grant PR,Visser ME,Brommer JE,Rosemary Grant B,Gustafsson L,Hatchwell BJ,Jerstad K,Karell P,Pietiäinen H,Roulin A,Røstad OW,Weimerskirch Hdoi
10.1038/ncomms12001subject
Has Abstractpub_date
2016-06-22 00:00:00pages
12001issn
2041-1723pii
ncomms12001journal_volume
7pub_type
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