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DOMINANCE AND PATCH DISTRIBUTION OF GREAT TITS PARUS MAJOR: A PRELIMINARY TEST OF THEORETICAL PREDICTIONS

DOMINANCE AND PATCH DISTRIBUTION OF GREAT TITS PARUS MAJOR: A PRELIMINARY TEST OF THEORETICAL... 1. Predictions from existing models on 'ideal free distribution of unequal competitors' were tested by comparing the intake rates of the birds in relation to their bowl preferences.2. Three types of distributions across two patches (1 and 2, where 1 provides higher food production rate than 2) were tested: truncated (H1> L1H2> L2), semi-truncated (H1> H2> L1L2), and mixed (H1H2> L1L2). Hiindicates highest individual intake rate in patch i, Liindicates lowest individual intake rate in patch i.3. The birds were studied in groups of six. They were fed by presenting two bowls containing mealworms, one bowl had twice the food-input rate of the other.4. Four birds visited the high-density bowl more often than the low-density bowl, whereas the other two birds showed no or opposite preferences.5. The semi-truncated distribution was the only distribution that could not be rejected by any criteria.6. When members of the experimental group were exchanged, the changes in individual intake rates suggest that the intake rate is related to each individual's quantitative competitive ability rather than to the individual's rank. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Behaviour Brill

DOMINANCE AND PATCH DISTRIBUTION OF GREAT TITS PARUS MAJOR: A PRELIMINARY TEST OF THEORETICAL PREDICTIONS

Behaviour , Volume 136 (1): 20 – Jan 1, 1999

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References (11)

Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0005-7959
eISSN
1568-539X
DOI
10.1163/156853999500686
Publisher site
See Article on Publisher Site

Abstract

1. Predictions from existing models on 'ideal free distribution of unequal competitors' were tested by comparing the intake rates of the birds in relation to their bowl preferences.2. Three types of distributions across two patches (1 and 2, where 1 provides higher food production rate than 2) were tested: truncated (H1> L1H2> L2), semi-truncated (H1> H2> L1L2), and mixed (H1H2> L1L2). Hiindicates highest individual intake rate in patch i, Liindicates lowest individual intake rate in patch i.3. The birds were studied in groups of six. They were fed by presenting two bowls containing mealworms, one bowl had twice the food-input rate of the other.4. Four birds visited the high-density bowl more often than the low-density bowl, whereas the other two birds showed no or opposite preferences.5. The semi-truncated distribution was the only distribution that could not be rejected by any criteria.6. When members of the experimental group were exchanged, the changes in individual intake rates suggest that the intake rate is related to each individual's quantitative competitive ability rather than to the individual's rank.

Journal

BehaviourBrill

Published: Jan 1, 1999

Keywords: IDEAL FREE DISTRIBUTION; FORAGING; COMPETITION

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