期刊
CURRENT ZOOLOGY
卷 61, 期 1, 页码 181-190出版社
CURRENT ZOOLOGY
DOI: 10.1093/czoolo/61.1.181
关键词
Hybridization; Speciation; Adaptive radiation; Conservation; Scalesia; Ecological niche
类别
资金
- Australian Research Council
- Rufford Small Grant Foundation
- Mohamed bin Zayed Species Conservation Fund
- Max Planck Institute for Ornithology
- Earthwatch Institute
- Charles Darwin Research Station
- Galapagos National Park Service
- TAME airlines
- community on Floreana Island
Hybrid speciation is increasingly recognized as a mechanism for novel evolutionary trajectories. However, we know very little about the ecology of a contact zone that has arisen in sympatry. This study examines the foraging behavior and fitness of two species of Darwin's tree finches (Camarhynchus parvulus, C. pauper) and hybrid offspring on Floreana Island. Previous study showed that the percentage of hybrids in the tree finch population increased from 19% in 2005 to 41% in 2010, and their body and beak size increased by similar to 5% (parental phenotype did not change). In 2005-2006, all three tree finch groups (two parental species and hybrid birds) used the same foraging substrate, technique, and height. By 2010-2013, the small tree finch C. parvulus had changed its foraging technique and the medium tree finch C. pauper had changed its foraging height. Both parental species had higher body condition when foraging at (divergent) mean foraging heights per species but hybrid birds did not. We discuss the implications of conserving forest to facilitate vertical niche expansion and the role of hybridization for genetic persistence
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