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

Regardless of the wealth of average ancient study performed on migration over many years, there's nonetheless a dearth of hypothesis-driven reviews that totally combine concept and empirical analyses to appreciate the reasons and results of migration, and a taxonomic bias in the direction of birds in a lot migration learn. This booklet takes a comparative, built-in view of animal migration, linking evolution with ecology and administration, thought with empirical learn, 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 intriguing new examine avenues which are now beginning up, no matter if as a result of advances in our figuring out of migration as a organic phenomenon or in the course of the availability of a variety of new applied sciences.

Broad topics that emerge contain integrating migration into the wide spectrum of stream habit, the necessity for a comparative and cross-taxonomic technique that considers migration at quite 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 learn of migration, together with satellite-tracking know-how, genomics, and modeling - all of that are associated with expanding computing strength. we're now at the verge of a leap forward in migration examine, that's an important given the a number of threats that face the conservation of migration as a phenomenon, together with weather swap.

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Bowlin, Ran Nathan, Bart A. 1 46 Discussion Introduction How and why do animals migrate? These questions, which can be answered at many levels of analysis, are deceptively simple. Aside from the obvious answer ‘because the benefits outweigh the costs’, 49 research has yet to provide concrete answers. In addition, the answers may vary from species to species. Thanks to the advent of new technologies that allow us to examine the year-round behaviour and physiology of migrants, however, we are now closer 35 36 M E C H A N I S T I C P R I N C I P L E S O F L O C O M OT I O N P E R F O R M A N C E I N M I G R AT I N G A N I M A L S than previously to being able to answer these questions—and ultimately to understanding how a lifehistory strategy like migration evolves in the first place.

Because R*A1R*A2=1, we can eliminate R*A1 from our equation by letting R*A1 = 1/R*A2 So, the conditions for non-migration to be an ESS are: * )RB2 1 > (1/ RA2 * 1 > RB1RA2 * > RB2 , and or RA2 * . or 1/RB1 > RA2 We can put these two inequalities together in a joint inequality, defining the necessary and sufficient demographic conditions for non-migration to be an ESS, as follows: * > RB2 . 1/ RB1 > RA2 (2) 19 Note that Equation 2 implies Equation 1, which was earlier deduced to be the condition for ecological stability of habitat specialization (to habitat A) in a seasonal world.

1) This simply restates the fact that, in a closed population, there is a geometric growth rate criterion for population persistence. If now a mutant individual arises that regularly shuttles back and forth between the two habitats, it can experience two possible net growth rates, depending upon the order of seasons it experiences. , a rare migratory clone which attempts to invade, and migrates completely between the two habitats within each year, then declines towards extinction), we must have both * RA2 * > RA1 * RB2 RA1 * RA2 * > RB1RA2 * .

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


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