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

Katharina Peters, Sonia Kleindorfer

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    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 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

    Original languageEnglish
    Pages (from-to)181-190
    Number of pages10
    JournalCurrent Zoology
    Volume61
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2015

    Keywords

    • Adaptive radiation
    • Conservation
    • Ecological niche
    • Hybridization
    • Scalesia
    • Speciation

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