Seasonal migration to high latitudes results in major reproductive benefits in an insect
Chapman, Jason W., Bell, James R., Burgin, Laura E., Reynolds, Donald R., Pettersson, Lars B., Hill, Jane K., Bonsall, Michael B. and Thomas, Jeremy A. (2012) Seasonal migration to high latitudes results in major reproductive benefits in an insect. Proceedings of the National Academy of Sciences of the United States of America (PNAS) ISSN 1091-6490, 109 (37). pp. 14924-14929. ISSN 0027-8424Full text not available from this repository.
Little is known of the population dynamics of long-range insect migrants, and it has been suggested that the annual journeys of billions of nonhardy insects to exploit temperate zones during summer represent a sink from which future generations seldom return (the “Pied Piper” effect). We combine data from entomological radars and ground-based light traps to show that annual migrations are highly adaptive in the noctuid moth Autographa gamma (silver Y), a major agricultural pest. We estimate that 10–240 million immigrants reach the United Kingdom each spring, but that summer breeding results in a fourfold increase in the abundance of the subsequent generation of adults, all of which emigrate southward in the fall. Trajectory simulations show that 80% of emigrants will reach regions suitable for winter breeding in the Mediterranean Basin, for which our population dynamics model predicts a winter carrying capacity only 20% of that of northern Europe during the summer. We conclude not only that poleward insect migrations in spring result in major population increases, but also that the persistence of such species is dependent on summer breeding in high-latitude regions, which requires a fundamental change in our understanding of insect migration.
|Additional Information:|| Published online before print August 27, 2012.  ISSN 0027-8424 (Print), 1091-6490 (Online).  This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1207255109/-/DCSupplemental.|
|Uncontrolled Keywords:||windborne migration, source-sink dynamics|
|Subjects:||Q Science > QH Natural history > QH301 Biology|
Q Science > QL Zoology
|School / Department / Research Groups:||Natural Resources Institute|
|Last Modified:||20 Nov 2012 12:46|
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