Niche conservatism constrains Australian honeyeater assemblages in stressful environments

E. T. Miller*, A. E. Zanne, R. E. Ricklefs

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    40 Citations (Scopus)

    Abstract

    The hypothesis of phylogenetic niche conservatism proposes that most extant members of a clade remain in ancestral environments because expansion into new ecological space imposes a selectional load on a population. A prediction that follows is that local assemblages contain increasingly phylogenetically clustered subsets of species with increasing difference from the ancestral environment of a clade. We test this in Australian Meliphagidae, a continental radiation of birds that originated in wet, subtropical environments, but subsequently spread to drier environments as Australia became more arid during the late Cenozoic. We find local assemblages are increasingly phylogenetically clustered along a gradient of decreasing precipitation. The pattern is less clear along a temperature gradient. We develop a novel phyloclimatespace to visualise the expansion of some lineages into drier habitats. Although few species extend into arid regions, those that do occupy larger ranges and thus local species richness does not decline predictably with precipitation.

    Original languageEnglish
    Pages (from-to)1186-1194
    Number of pages9
    JournalEcology Letters
    Volume16
    Issue number9
    DOIs
    Publication statusPublished - 2013

    Keywords

    • Arid zone
    • Australia
    • Biodiversity gradients
    • Community assembly
    • Meliphagidae
    • Phyloclimatespace
    • Phylogenetic clustering
    • Phylogenetic niche conservatism
    • Phylogenetic structure
    • Range size

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