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Determinants of local abundance in a major radiation of Australian passerines (Aves: Meliphagoidea)

Symonds, Matthew R. E. and Johnson, Christopher N. 2006, Determinants of local abundance in a major radiation of Australian passerines (Aves: Meliphagoidea), Journal of biogeography, vol. 33, no. 5, pp. 794-802, doi: 10.1111/j.1365-2699.2005.01432.x.

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Title Determinants of local abundance in a major radiation of Australian passerines (Aves: Meliphagoidea)
Author(s) Symonds, Matthew R. E.ORCID iD for Symonds, Matthew R. E. orcid.org/0000-0002-9785-6045
Johnson, Christopher N.
Journal name Journal of biogeography
Volume number 33
Issue number 5
Start page 794
End page 802
Total pages 9
Publisher Wiley - Blackwell Publishing
Place of publication Oxford , Eng.
Publication date 2006-05
ISSN 0305-0270
1365-2699
Keyword(s) abundance
Bergmann’s rule
body size
diet breadth
geographical range size
habitat breadth
latitude
Passeriformes
population density
rarity
Summary Aim  To identify the factors that contribute to variation in abundance (population density), and to investigate whether habitat breadth and diet breadth predict macroecological patterns in a suborder of passerine birds (Meliphagoidea).
Location  Australia (including Tasmania).
Methods  Mean abundance data were collated from site surveys of bird abundance (the Australian Bird Count); range size and latitudinal position data from published distribution maps; and body mass and diet breadth information from published accounts. A diversity index of habitats used (habitat breadth) was calculated from the bird census data. We used bivariate correlation and multiple regression techniques, employing two phylogenetic comparative methods: phylogenetic generalized least squares and independent contrasts.

Results  Body mass and latitude were the only strong predictors of abundance, with larger-bodied and lower-latitude species existing at lower densities. Together, however, body mass and latitude explained only 11.1% of the variation in mean abundance. Range size and habitat breadth were positively correlated, as were diet breadth and body mass. However, neither range size, nor habitat breadth and diet breadth, explained patterns in abundance either directly or indirectly.
Main conclusions  Levels of abundance (population density) in meliphagoid birds are most closely linked to body mass and latitudinal position, but not range size. As with many other macroecological analyses, we find little evidence for aspects of niche breadth having an effect on patterns of abundance. We hypothesize that evolutionary age may also have a determining effect on why species tend to be rarer (less abundant) in the tropics.
Language eng
DOI 10.1111/j.1365-2699.2005.01432.x
Field of Research 060207 Population Ecology
060309 Phylogeny and Comparative Analysis
060809 Vertebrate Biology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2006, Wiley-Blackwell
Persistent URL http://hdl.handle.net/10536/DRO/DU:30039069

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