Effects of habitat quality on the number of alloparents and nest provisioning rates in a cooperatively breeding tropical passerine

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Wonkson P., Savini T., Gale G.A.

ปีที่เผยแพร่ (ค.ศ.): 2012

Volume number: 51

Issue number: 8

หน้าแรก: 1464

หน้าสุดท้าย: 1474

จำนวนหน้า: 11

นอก: 1021-5506

eISSN: 1021-5506

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84881050285&partnerID=40&md5=49e46abd3534241e7bf4a075d8a3a667

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

Habitat quality is likely to impact group size, provisioning behavior, and nesting success of cooperatively breeding birds; however, predicting the direction of these effects is particularly challenging. We investigated the influence of habitat quality on the number of alloparents in breeding groups and whether the presence or the number of alloparents influenced nest survival, provisioning rates, and individual breeder workloads in the Puff-throated Bulbul (Alophoixus pallidus), a tropical understory passerine. We used arthropod biomass as a proxy for habitat quality of 17 territories. We also analyzed data from 143 nests from 41 breeding groups during 3 breeding seasons to assess effects of alloparents on reproductive success. Habitat quality was not significantly correlated with the number of alloparents per group (p = 0.07), the number of fledgling produced (p = 0.08), or the provisioning rate (p = 0.99). The number of fledglings produced was also not significantly correlated with the number of alloparents (p = 0.71). Overall provisioning rates were marginally higher for groups with no alloparents compared to groups with alloparents (p = 0.055), but provisioning rates of breeders significantly declined with increases in alloparent numbers (p < 0.05). The lack of simple habitat effects on the number of alloparents may have been due to a complex suite of factors affecting both the production and dispersal of offspring and the recruitment of unrelated alloparents. The lack of a correlation between nesting success and alloparent numbers may have been due to the inability of adult birds to dissuade most predators in this system.

คำสำคัญ

Alloparents, Provisioning, Puff-throated Bulbul, Variable social structure