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Generation time and temporal scaling of bird population dynamics.
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Generation time and temporal scaling of bird population dynamics.

Author: BE Saether Affiliation: Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway. bernt-erik.sather@bio.ntnu.noR LandeS EngenH WeimerskirchM LillegårdAll authors
Edition/Format: Article Article : English
Publication:Nature, 2005 Jul 07; 436(7047): 99-102
Other Databases: WorldCatWorldCat
Summary:
Theoretical studies have shown that variation in density regulation strongly influences population dynamics, yet our understanding of factors influencing the strength of density dependence in natural populations still is limited. Consequently, few general hypotheses have been advanced to explain the large differences between species in the magnitude of population fluctuations. One reason for this is that the  Read more...
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Document Type: Article
All Authors / Contributors: BE Saether Affiliation: Department of Biology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway. bernt-erik.sather@bio.ntnu.no; R Lande; S Engen; H Weimerskirch; M Lillegård; R Altwegg; PH Becker; T Bregnballe; JE Brommer; RH McCleery; J Merilä; E Nyholm; W Rendell; RR Robertson; P Tryjanowski; ME Visser
ISSN:0028-0836
Language Note: English
Unique Identifier: 110747726
Awards:

Abstract:

Theoretical studies have shown that variation in density regulation strongly influences population dynamics, yet our understanding of factors influencing the strength of density dependence in natural populations still is limited. Consequently, few general hypotheses have been advanced to explain the large differences between species in the magnitude of population fluctuations. One reason for this is that the detection of density regulation in population time series is complicated by time lags induced by the life history of species that make it difficult to separate the relative contributions of intrinsic and extrinsic factors to the population dynamics. Here we use population time series for 23 bird species to estimate parameters of a stochastic density-dependent age-structured model. We show that both the strength of total density dependence in the life history and the magnitude of environmental stochasticity, including transient fluctuations in age structure, increase with generation time. These results indicate that the relationships between demographic and life-history traits in birds translate into distinct population dynamical patterns that are apparent only on a scale of generations.

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