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Saether, B.-E.; Lande, R.; Engen, S.; Weimerskirch, H.; Lillegard, M.; Altwegg, R.; Becker, P.H.; Bregnballe, T.; Brommer, J.E.; McCleery, R.H.; Merila, J.; Nyholm, E.; Rendell, W.; Robertson, R.R.; Tryjanowski, P.; Visser, M.E. (2005). Generation time and temporal scaling of bird population dynamics. AADE editors' journal, 436(7047), 99–102.
Abstract: Theoretical studies have shown that variation in density regulation strongly influences population dynamics1, yet our understanding of factors influencing the strength of density dependence in natural populations still is limited2. Consequently, few general hypotheses have been advanced to explain the large differences between species in the magnitude of population fluctuations3, 4, 5, 6. 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 species7, 8 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 birds9, 10 translate into distinct population dynamical patterns that are apparent only on a scale of generations.
Programme: 109
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EPICA Community Members. (2004). Eight glacial cycles from an Antarctic ice core. Nature, 429(6992), 623–628.
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Lorius, C.; Jouzel, J.; Raynaud, D.; Hansen, J.; Treut, H.L. (1990). The ice-core record: climate sensitivity and future greenhouse warming. Nature, 347(6289), 139–145.
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Vimeux, F.; Masson, V.; Jouzel, J.; Stievenard, M.; Petit, J.R. (1999). Glacial-interglacial changes in ocean surface conditions in the Southern Hemisphere. Nature, 398(6726), 410–413.
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Van De Vijver B., Denys L. & Beyens L. (2000). Fragilaria husvikensis sp. nov. (Bacillariophyceae), another Fragilaria species with transapical ribs from Subantarctica. Nova Hedwigia, , 537–550.
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Dubois J. (1997). Bachelor's thesis, , .
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Angelier J. & Bergerat F. (1997). The South Iceland Seismic zone – Part II: Stress fields and mecanisms of seismogenic faults..
Abstract: Abstr., Workshop Prenlab – 1, 24-25 octobre Paris
Programme: 316
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Guinard E., Weimreskirch H. & Jouventin P. (1998). Population changes and demography of the northern rockhopper penguin on Amsterdam and Saint Paul islands. Colonial waterbirds, 21(2), 222–228.
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Riaux-Gobin C., Treguer P. & Poulin M. (1997).
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Shum Woodworth A., Egbert F., King K., Le Provost L.I., Molines P.R., Schlax S. & Tierney V. (1997). Accuracy asessment of recent ocean tide models. J. Geophys. Res., 102(C11), 25173–25194.
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