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The effects of helpers in cooperatively breeding purple gallinules

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Summary

The effects of helpers in a population of cooperatively breeding purple gallinules (Porphyrula martinica) were examined. All young birds past the age of 2 months helped feed and protect subsequent broods of chicks and participated in territorial defense. Most helpers remained on their natal territories for approximately 1 year. The number of helpers varied both among and within breeding groups. Clutch production and chick survival were related positively to the number of helpers in the group. The increase in chick survival was independent of several measures of territory quality. Helpers possibly aided chick survival by provicing extra food for the chicks and decreasing predation risk. Helpers were necessary in order for a breeding pair to keep a territory long enough to produce more than one clutch of eggs. A change in the number of helpers (increase or decrease) often was followed by a similar change in territory size. These results suggest that purple gallnule helpers can increase the reproductive success of the breeding group and may be vital for the continued maintenance of a breeding territory.

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  1. Departiment of Zoology, University of Montana, 59812, Missoua, Montana, USA

    Laurie A. Hunter

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  1. Laurie A. Hunter
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Hunter, L.A. The effects of helpers in cooperatively breeding purple gallinules. Behav Ecol Sociobiol 18, 147–153 (1985). https://doi.org/10.1007/BF00299043

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  • DOI: https://doi.org/10.1007/BF00299043

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