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Seabird colony distributions suggest competition for food supplies during the breeding season (1984)

Furness, R. W. ; Birkhead, T. R.

[s.l.] : Nature Publishing Group

Nature 311 (1984), S. 655-656

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] We tested the idea of prey depeletion by considering spatial distribution and sizes of seabird colonies, as a direct demonstration would require an expensive marine sampling programme. If Ashmole's model is correct, then in an area of uniform mean productivity, colony size should be strongly and ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/311655a0

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Changing priorities: the effect of pre-migratory fattening on the trade-off between foraging and vigilance (1984)

Metcalfe, N. B. ; Furness, R. W.

Springer

Behavioral ecology and sociobiology 15 (1984), S. 203-206

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ISSN: 1432-0762

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Many birds accumulate fat reserves prior to departure on long distance migration. Since there will be an increased food requirement during the pre-migratory period, it is to be expected that more time will be invested in foraging, at the expense of other activities. The allocation of time to anti-predatory behavior in migratory ruddy turnstones (adults) was found to decrease prior to migration (Fig. 1); non-migratory individuals (juveniles) showed no decrease over the same time period (Fig. 2). This is interpreted as a change in the optimal adult behavior, the cost of a reduced rate of resource accumulation outweighing the additional risk of predation which results from the decrease in vigilance.