کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4380715 1617713 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Does intraspecific competition facilitate age separation in timing of southward migration in waders?
ترجمه فارسی عنوان
آیا رقابت درون فردی، تمایل به جداسازی سن را در زمانبندی مهاجرت به سمت جنوب در جادوگران فراهم می کند؟
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• Competition between young and adult wood sandpipers was studied on fall migration.
• Juveniles refuelled slowly and had lower fat reserves when competition increased.
• Under intense competition, juveniles left the stopover site quickly after arrival.
• Age separation during migration reduces the costs of intraspecific competition.
• Late departure from natal grounds may be adaptive for juvenile waders.

In many Palaearctic wader species there is a clear separation in the timing of adult and juvenile southward migration. This phenomenon is traditionally explained by the selection on adults to depart early from breeding grounds and necessity of juveniles to prepare longer for migration. In this study we hypothesize that late departure from natal grounds may also be adaptive for juveniles, as it allows them to avoid intensified interference competition at stopover sites with adult, usually more dominant conspecifics. To test this hypothesis we analysed long-term data on stopover behaviour of juvenile wood sandpipers (Tringa glareola) staying at a central Polish stopover site under varying levels of competition from adult birds. The results clearly indicated that juveniles were highly disadvantaged by the simultaneous presence of adults at the same staging site, as under intense competition from older conspecifics they refuelled more slowly and attained lower fat reserves. It was also found that juveniles which were forced to compete with adults left the site quickly and possibly searched for more favourable staging places. All these imply that delayed departure from natal grounds may be adaptive for juvenile waders, allowing them to mismatch the timing of their first migration with the peak of adult passage and, thus, reduce the negative consequences of intraspecific competition during migration.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Oecologica - Volume 58, July 2014, Pages 44–48
نویسندگان
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