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Sankamethawee Wangworn Pierce Andrew J. Hardesty Britta Denise Gale George A. 《Ecological Research》2011,26(2):429-436
Survival of tropical passerines is thought to be higher than those in northern temperate regions, but relatively few tropical
studies have addressed this issue, particularly in tropical Asia. We examined factors that may have influenced the survival
rate of a cooperatively breeding bird, the puff-throated bulbul (Alophoixus pallidus), in an evergreen forest in northeastern Thailand. These factors included year, season (breeding and non-breeding), sex,
and presence of helper(s) in a family group. We present evidence of breeding season-dependent survival in a tropical passerine
using an information theoretic approach based on both mark-recapture and resighting data collected during 6 years of study.
Based on colour-banded adults the annual survival rate did not vary significantly among years (average = 0.85 ± 0.02 SE).
The mean lifespan (MLS) for the population was 6.22 ± 4.38 SE years. Survivorship was lower during the breeding season (0.89 ± 0.02
SE) than during the non-breeding season (0.96 ± 0.02 SE). The MLS of males and females was 6.70 ± 7.73 SE and 5.87 ± 4.88
SE years, respectively. The annual survival rate we observed was high compared to the estimates of other tropical and temperate
passerines, possibly due to the relatively stable climatic conditions in tropical latitudes and puff-throated bulbuls being
generalists that exploit a wide range of food resources both in space and time. 相似文献
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Wangworn Sankamethawee Britta Denise Hardesty George A. Gale 《Journal of Ornithology》2010,151(4):779-789
While natal dispersal can have a significant impact on population dynamics, it is typically difficult to quantify. We investigated
timing of natal dispersal of the cooperatively breeding Puff-throated Bulbul Alophoixus pallidus in a tropical evergreen forest by modelling the probability of staying in or dispersing from their natal territory whilst
taking into account the effects of sex, group size, and the presence of helper(s). Birds did not disperse until the beginning
of and during the breeding season following the hatching year. Dispersal was strongly female-biased both in frequency and
distance: most females (95%) dispersed away from their natal territories, and of those relocated, traversed 2–7 territories.
In contrast, 50% of males remained in the natal territory as helpers in their second year, while relocated dispersing males
crossed 1–2 territories. Natal dispersal was not influenced by either group size or the presence of helpers. Males that fledged
earlier in the breeding season exhibited higher rates of philopatry than the males that fledged later, but no correlation
between fledging date and philopatry was observed in females. The probability of staying in the natal territory during the
second year was 0.58 ± 0.14 SE and 0.05 ± 0.04 for males and females, respectively. These findings may add to our understanding
of how natal dispersal can reflect social patterns and kin structure in cooperative breeding species from a little-studied
tropical forest region. 相似文献
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