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Provisioning behaviour in relation to food availability and nestling food demand in the Water Pipit Anthus spinoletta.


Rauter, C; Brodmann, P A; Reyer, H U (1999). Provisioning behaviour in relation to food availability and nestling food demand in the Water Pipit Anthus spinoletta. Ardea, 88(1):81-90.

Abstract

Insufficient food provisioning by parents can reduce growth rate of altricial nestlings, their size and weight at fledging, and also affect survival. Therefore at low food availability, parents should increase their food provisioning effort. In insectivorous Water Pipits Anthus spinoletta prey biomass differed up to 50 times among home ranges; nevertheless, number, size and weight of fledglings did not differ between home ranges with low and high prey biomass. Based on predictions from the literature, we investigated whether and how parents adjust their provisioning behaviour to food availability, measured by arthropod biomass, and to nestling demands, measured by brood size, nestling age and ambient temperature. Foraging distances did not vary significantly with any of the four variables. Feeding rates were also not related to food availability, but increased with brood size in both sexes. In addition, females showed a tendency to increase feeding rate with decreasing air temperature. Our results suggest that, at least in some years, arthropod food is so abundant in the birds' environment that it does not limit reproductive success.

Abstract

Insufficient food provisioning by parents can reduce growth rate of altricial nestlings, their size and weight at fledging, and also affect survival. Therefore at low food availability, parents should increase their food provisioning effort. In insectivorous Water Pipits Anthus spinoletta prey biomass differed up to 50 times among home ranges; nevertheless, number, size and weight of fledglings did not differ between home ranges with low and high prey biomass. Based on predictions from the literature, we investigated whether and how parents adjust their provisioning behaviour to food availability, measured by arthropod biomass, and to nestling demands, measured by brood size, nestling age and ambient temperature. Foraging distances did not vary significantly with any of the four variables. Feeding rates were also not related to food availability, but increased with brood size in both sexes. In addition, females showed a tendency to increase feeding rate with decreasing air temperature. Our results suggest that, at least in some years, arthropod food is so abundant in the birds' environment that it does not limit reproductive success.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Evolutionary Biology and Environmental Studies
Dewey Decimal Classification:570 Life sciences; biology
590 Animals (Zoology)
Language:English
Date:11 November 1999
Deposited On:11 Feb 2008 12:16
Last Modified:05 Apr 2016 12:14
Publisher:Netherlands Ornithologists' Union
ISSN:0373-2266
Related URLs:http://nou.natuurinfo.nl/website/ardea/ardea_show_abstract.php?lang=uk&nr=87

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