Animal Migrations. A synthesis by E.J. Milner-Gulland, John M. Fryxell, Anthony R.E. Sinclair PDF

By E.J. Milner-Gulland, John M. Fryxell, Anthony R.E. Sinclair

Regardless of the wealth of ordinary old learn carried out on migration over many years, there's nonetheless a dearth of hypothesis-driven experiences that absolutely combine conception and empirical analyses to appreciate the reasons and outcomes of migration, and a taxonomic bias in the direction of birds in a lot migration learn. This publication takes a comparative, built-in view of animal migration, linking evolution with ecology and administration, thought with empirical examine, and embracing the entire significant migratory taxa (including human pastoralists). The scope extends past the objective organism to think about the ecosystem-level dynamics of migration. The emphasis is on fascinating new examine avenues which are now establishing up, even if because of advances in our knowing of migration as a organic phenomenon or throughout the availability of a variety of new applied sciences.

Broad topics that emerge contain integrating migration into the large spectrum of flow habit, the necessity for a comparative and cross-taxonomic procedure that considers migration at a number temporal and spatial scales, and exam of the most important roles of source uncertainty and spatial heterogeneity in riding migratory habit. The ebook identifies the potential of new instruments to revolutionize the research of migration, together with satellite-tracking expertise, genomics, and modeling - all of that are associated with expanding computing energy. we're now at the verge of a step forward in migration examine, that's the most important given the a number of threats that face the conservation of migration as a phenomenon, together with weather switch.

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1999). 2 (a) A range equation for a flying animal, showing how the optimal departure fuel load (fopt) is obtained according to Equation 3. In the case of a barrier at distance Dbar ahead of the animal, the minimum requirement is a fuel load fmin. t0 and f0 are search/settling time and energy costs, respectively, and k is the daily fuel accumulation rate. (b) Illustration of the effect of different fuel accumulation rates k1 and k2 (k2 < k1) on the optimal departure fuel load f1 and f2, and the optimal departure fuel load associated with minimization of cost of transport (f).

What our model results suggest is that the combination of seasonality and migration can permit species coexistence, despite their competitive equivalence within patches. It has long been appreciated that geographic variation in survival rates outside the breeding season can contribute importantly to the selective advantage of migration (Lundberg 1988). Lack (1968) pointed out that temporal variation in survival rates could lead to balanced long-term fitness of migrants vs. residents. Similar arguments underlie von Haartman’s (1968) state-dependent evolutionary arguments for the evolution of avian migration; resident birds obtain compensatory reproductive advantage balancing the higher over-wintering costs relative to migrants.

69. 31 (where Neq = 1 + sA/rA). 5 in the non-growing season. Fit- ness over the year is the product of these two numbers, 1, so the population in habitat A is in demographic equilibrium. 28 (where Neq = 1 + sB/rB). 7. Good and bad seasons are synchronized across space. 4, so it would be selected and increase when rare (Fig. 1). In this example, one would expect to see the evolution of at least some migration into and out of the poorer habitat. Paradoxically, however, some individuals should leave just as conditions begin to improve locally in habitat A.

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