Resource Partitioning by Mangrove Bird Communities in North Australia

Jayasilan Mohd-Azlan, Richard Noske, Michael Lawes

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Mangrove bird communities in north Australia comprise relatively few passerine species compared with other arboreal habitats in the region. Mangroves are dominated by a few tree species and there are potentially few resource axes available for partitioning by terrestrial birds. Competition for limited resources is predicted to cause strong niche differentiation and a highly structured, but low diversity, bird assemblage. Using multivariate and bipartite network analyses based on 1771 foraging observations (33% of 5320 behavioral observations), we examined resource partitioning by 20 terrestrial bird species in mangroves of north Australia. The mangrove bird community largely comprised generalist insectivores that partitioned insects by size with moderate-to-high interspecific overlap in diet. Gleaning for insects was the most common foraging mode. Few species specialized on nectar. Flowers of one or more mangrove species were available in every month of the year and insect abundance was correlated with flowering peaks. Niche differentiation by birds was determined by food type and foraging mode more than by broad spatial (mangrove zones) or temporal (seasonal) segregation of the use of resources. There was little evidence of bird species saturation or species sorting, suggesting loose species packing and a lesser role than expected for species interactions and interference competition in structuring the bird assemblage in mangroves.
    Original languageEnglish
    Pages (from-to)331-340
    Number of pages10
    JournalBiotropica
    Volume46
    Issue number3
    DOIs
    Publication statusPublished - May 2014

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    niche partitioning
    mangrove
    bird
    birds
    insect
    foraging
    niche
    insects
    resource
    niches
    food recovery
    interference competition
    insectivore
    passerine
    nectar
    insectivores
    generalist
    sorting
    flowering
    flower

    Cite this

    Mohd-Azlan, Jayasilan ; Noske, Richard ; Lawes, Michael. / Resource Partitioning by Mangrove Bird Communities in North Australia. In: Biotropica. 2014 ; Vol. 46, No. 3. pp. 331-340.
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    abstract = "Mangrove bird communities in north Australia comprise relatively few passerine species compared with other arboreal habitats in the region. Mangroves are dominated by a few tree species and there are potentially few resource axes available for partitioning by terrestrial birds. Competition for limited resources is predicted to cause strong niche differentiation and a highly structured, but low diversity, bird assemblage. Using multivariate and bipartite network analyses based on 1771 foraging observations (33{\%} of 5320 behavioral observations), we examined resource partitioning by 20 terrestrial bird species in mangroves of north Australia. The mangrove bird community largely comprised generalist insectivores that partitioned insects by size with moderate-to-high interspecific overlap in diet. Gleaning for insects was the most common foraging mode. Few species specialized on nectar. Flowers of one or more mangrove species were available in every month of the year and insect abundance was correlated with flowering peaks. Niche differentiation by birds was determined by food type and foraging mode more than by broad spatial (mangrove zones) or temporal (seasonal) segregation of the use of resources. There was little evidence of bird species saturation or species sorting, suggesting loose species packing and a lesser role than expected for species interactions and interference competition in structuring the bird assemblage in mangroves.",
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    Mohd-Azlan, J, Noske, R & Lawes, M 2014, 'Resource Partitioning by Mangrove Bird Communities in North Australia', Biotropica, vol. 46, no. 3, pp. 331-340. https://doi.org/10.1111/btp.12108

    Resource Partitioning by Mangrove Bird Communities in North Australia. / Mohd-Azlan, Jayasilan; Noske, Richard; Lawes, Michael.

    In: Biotropica, Vol. 46, No. 3, 05.2014, p. 331-340.

    Research output: Contribution to journalArticleResearchpeer-review

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