Divergent foraging behavior in a hybrid zone： Darwin＇s tree finches （Camarhynchus spp.） on Floreana Island  

作　　者：Katharina J. PETERS Sonia KLEINDORFER 

机构地区：[1]School of Biological Sciences, Flinders University, GPO Box 2100, Adelaide 5001, Australia

出　　处：《Current Zoology》2015年第1期181-190,共10页动物学报（英文版）

摘　　要：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 -5% （parental phenotype did not change）. In 2005-2006, all three tree finch groups （two paren- tal species and hybrid birds） used the same foraging substrate, technique, and height. By 2010-2013, the small tree finch C. par- vulus 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 persis- tence [Current Zoology 61 （1）： 181-190, 2015].

关 键 词：HYBRIDIZATION SPECIATION Adaptive radiation Conservation Scalesia Ecological niche 

分 类 号：Q958[生物学—动物学] X502[环境科学与工程—环境工程]