A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Demographic routes to variability and regulation in bird populations
Tekijät: Saether BE, Grotan V, Engen S, Coulson T, Grant PR, Visser ME, Brommer JE, Grant BR, Gustafsson L, Hatchwell BJ, Jerstad K, Karell P, Pietiainen H, Roulin A, Rostad OW, Weimerskirch H
Kustantaja: NATURE PUBLISHING GROUP
Julkaisuvuosi: 2016
Journal: Nature Communications
Tietokannassa oleva lehden nimi: NATURE COMMUNICATIONS
Lehden akronyymi: NAT COMMUN
Artikkelin numero: ARTN 12001
Vuosikerta: 7
Sivujen määrä: 8
ISSN: 2041-1723
DOI: https://doi.org/10.1038/ncomms12001
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.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
