Latitudinal and insular variation in morphology of a small Australian passerine: consequences for dispersal distance and conservation
Richard E. Major
+ Author Affiliations
- Author Affiliations
Australian Museum, 6 College Street, Sydney, NSW 2010, Australia.
Email: richard.major@austmus.gov.au
Australian Journal of Zoology 60(3) 210-218 https://doi.org/10.1071/ZO12078
Submitted: 16 November 2011 Accepted: 25 September 2012 Published: 19 October 2012
Abstract
Dispersal ability is a fundamental attribute of threatened species that influences their prognosis for survival in fragmented habitats. More vagile species are considered to be under lower threat from habitat fragmentation than more sedentary species. This study investigates morphological variation amongst island and mainland populations of a threatened Australian passerine, the white-fronted chat (Epthianura albifrons), to review previous conclusions about levels of population differentiation and consequent conclusions about dispersal ability. Standard body measurements were taken from wild-caught birds from three islands and three mainland regions of Australia, ranging over a latitudinal distance of 1150 km and a longitudinal distance of 3300 km. Significant size variation in wing, bill and headbill lengths were found amongst populations, revealing a significant latitudinal trend consistent with ‘Bergmann’s Rule’. Even after accounting for the latitudinal trend, island populations showed significant differentiation from mainland populations in some attributes, although island populations were not consistently larger than mainland populations, as predicted by the ‘Island Rule’. A lack of size variation between island and mainland museum specimens has historically been used to conclude that white-fronted chats are capable of crossing an oceanic barrier of at least 30 km. The level of population differentiation identified in this study suggests that previous estimates of dispersal capacity may be overestimated.
Additional keywords: Bergmann’s Rule, honeyeater, Island Rule, morphometric, nomad, salt marsh, white-fronted chat.
References
Ashcroft, M. B., and Major, R. E. (2012). The importance of matrix permeability and quantity of core habitat for persistence of a threatened saltmarsh bird. Austral Ecology , .| The importance of matrix permeability and quantity of core habitat for persistence of a threatened saltmarsh bird.Crossref | GoogleScholarGoogle Scholar |
Barrett, G. W., Silcocks, A. F., Barry, S., Cunningham, R., and Poulter, R. (2003). ‘The New Atlas of Australian Birds.’ (RAOU: Melbourne.)
Cartar, R. V., and Morrison, R. I. G. (2005). Metabolic correlates of leg length in breeding arctic shorebirds: the cost of getting high. Journal of Biogeography 32, 377–382.
| Metabolic correlates of leg length in breeding arctic shorebirds: the cost of getting high.Crossref | GoogleScholarGoogle Scholar |
Clegg, S. M., and Owens, I. P. F. (2002). The ‘island rule’ in birds: medium body size and its ecological explanation. Proceedings of the Royal Society of London. Series B, Biological Sciences 269, 1359–1365.
| The ‘island rule’ in birds: medium body size and its ecological explanation.Crossref | GoogleScholarGoogle Scholar |
Davies, S. J. J. F. (1984). Nomadism as a response to desert conditions in Australia. Journal of Arid Environments 7, 183–195.
Dawideit, B. A., Phillimore, A. B., Laube, I., Leisler, B., and Bohning-Gaese, K. (2009). Ecomorphological predictors of natal dispersal distances in birds. Journal of Animal Ecology 78, 388–395.
| Ecomorphological predictors of natal dispersal distances in birds.Crossref | GoogleScholarGoogle Scholar |
de León, L. F., Bermingham, E., Podos, J., and Hendry, A. P. (2010). Divergence with gene flow as facilitated by ecological differences: within-island variation in Darwin’s finches. Philosophical Transactions of the Royal Society B-Biological Sciences 365, 1041–1052.
| Divergence with gene flow as facilitated by ecological differences: within-island variation in Darwin’s finches.Crossref | GoogleScholarGoogle Scholar |
Devictor, V, Julliard, R, and Jiguet, F (2008). Distribution of specialist and generalist species along spatial gradients of habitat disturbance and fragmentation. Oikos 117, 507–514.
Gardner J. L. Heinsohn R. Joseph L. 2009
Haig, S. M., Bronaugh, W. M., Crowhurst, R. S., D’Elia, J., Eagles-Smith, C. A., Epps, C. W., Knaus, B., Miller, M. P., Moses, M. L., Oyler-McCance, S., Robinson, W. D., and Sidlauskas, B. (2011). Genetic applications in avian conservation. The Auk 128, 205–229.
| Genetic applications in avian conservation.Crossref | GoogleScholarGoogle Scholar |
Hawkes, C. (2009). Linking movement behaviour, dispersal and population processes: is individual variation a key? Journal of Animal Ecology 78, 894–906.
| Linking movement behaviour, dispersal and population processes: is individual variation a key?Crossref | GoogleScholarGoogle Scholar |
Higgins, P. J., Peter, J. M., and Steele, W. K. (2001). ‘Handbook of Australian, New Zealand & Antarctic Birds. Volume 5, Tyrant-flycatchers to Chats.’ (Oxford University Press: Melbourne.)
Jenner, B., French, K., Oxenham, K., and Major, R. E. (2011). Population decline of the white-fronted chat (Epthianura albifrons) in New South Wales, Australia. Emu 111, 84–91.
| Population decline of the white-fronted chat (Epthianura albifrons) in New South Wales, Australia.Crossref | GoogleScholarGoogle Scholar |
Jordan, M. A., Snell, H. L., Snell, H. M., and Jordan, W. C. (2005). Phenotypic divergence despite high levels of gene flow in Galapagos lava lizards (Microlophus albemarlensis). Molecular Ecology 14, 859–867.
| Phenotypic divergence despite high levels of gene flow in Galapagos lava lizards (Microlophus albemarlensis).Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXjtVGit7k%3D&md5=87b479e8eac79a66e269156d2dd20122CAS |
Keast, A. (1958). The relationship between seasonal movements and the development of geographic variation in the Australian chats (Epthianura Gould and Ashbyia North (Passeres: Muscicapidae, Malurinae)). Australian Journal of Zoology 6, 53–68.
| The relationship between seasonal movements and the development of geographic variation in the Australian chats (Epthianura Gould and Ashbyia North (Passeres: Muscicapidae, Malurinae)).Crossref | GoogleScholarGoogle Scholar |
Keast, A. (1968). Seasonal movements in the Australian honeyeaters (Meliphagidae) and their ecological significance. Emu 67, 159–209.
| Seasonal movements in the Australian honeyeaters (Meliphagidae) and their ecological significance.Crossref | GoogleScholarGoogle Scholar |
Laegdsgaard, P., Kelleway, J. K., Williams, R. J., and Harty, C. (2009). Protection and management of coastal saltmarsh. In ‘Australian Saltmarsh Ecology’. (Ed. N. Saintilan.) pp. 179–210. (CSIRO Publishing: Melbourne.)
Lambeck, K., and Chappell, J. (2001). Sea level change through the last glacial cycle. Science 292, 679–686.
| Sea level change through the last glacial cycle.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3MXjt1els74%3D&md5=6fdbdfef45f17374f2f000c84bea4bc7CAS |
Major, R. E. (1991). Flocking and feeding in the white-fronted chat Ephthianura albifrons: the relationship between diet, food availability and patch selection. Australian Journal of Ecology 16, 395–406.
| Flocking and feeding in the white-fronted chat Ephthianura albifrons: the relationship between diet, food availability and patch selection.Crossref | GoogleScholarGoogle Scholar |
Mathews, G. M. (1912). A reference-list to the birds of Australia. Novitates Zoologicae 18, 171–656.
Mayr, E., and Cottrell, G. W. (1986). ‘Check-list of Birds of the World.’ (Museum of Comparative Zoology: Cambridge, MA.)
Mayr, E., and Diamond, J. (2001). ‘The Birds of Northern Melanesia: Speciation, Ecology, and Biogeography.’ (Oxford University Press: New York.)
McNab, B. K. (2010). Geographic and temporal correlations of mammalian size reconsidered: a resource rule. Oecologia 164, 13–23.
| Geographic and temporal correlations of mammalian size reconsidered: a resource rule.Crossref | GoogleScholarGoogle Scholar |
Meiri, S., and Dayan, T. (2003). On the validity of Bergmann’s rule. Journal of Biogeography 30, 331–351.
| On the validity of Bergmann’s rule.Crossref | GoogleScholarGoogle Scholar |
NABC. (2001). ‘The North American Banders’ Study Guide.’ (North American Banding Council: Point Reyes Station, CA.)
Opdam, P., and Wascher, D. (2004). Climate change meets habitat fragmentation: linking landscape and biogeographical scale levels in research and conservation. Biological Conservation 117, 285–297.
| Climate change meets habitat fragmentation: linking landscape and biogeographical scale levels in research and conservation.Crossref | GoogleScholarGoogle Scholar |
Paradis, E., Baillie, S. R., Sutherland, W. J., and Gregory, R. D. (1998). Patterns of natal and breeding dispersal in birds. Journal of Animal Ecology 67, 518–536.
| Patterns of natal and breeding dispersal in birds.Crossref | GoogleScholarGoogle Scholar |
Pinho, C., and Hey, J. (2010). Divergence with gene flow: models and data. Annual Review of Ecology Evolution and Systematics 41, 215–230.
| Divergence with gene flow: models and data.Crossref | GoogleScholarGoogle Scholar |
Price, T. (2008). ‘Speciation in Birds.’ (Roberts & Co: Colorado.)
Rogers, K., Rogers, A., and Rogers, D. (1986). ‘Bander’s Aid: a Guide to Ageing and Sexing Bush Birds.’ (A. Rogers: St Andrews, Victoria.)
Saintilan, N., Rogers, K., and Howe, A. (2009). Geomorphology and habitat dynamics. In ‘Australian Saltmarsh Ecology.’ (Ed. N. Saintilan.) pp. 53–74. (CSIRO Publishing: Melbourne.)
Schodde, R., and Mason, I. (1999). ‘The Directory of Australian Birds. Passerines.’ (CSIRO Publishing: Melbourne.)
Sunnucks, P. (2011). Towards modelling persistence of woodland birds: the role of genetics. Emu 111, 19–39.
| Towards modelling persistence of woodland birds: the role of genetics.Crossref | GoogleScholarGoogle Scholar |
Symonds, M. R. E., and Tattersall, G. J. (2010). Geographical variation in bill size across bird species provides evidence for Allen’s Rule. American Naturalist 176, 188–197.
| Geographical variation in bill size across bird species provides evidence for Allen’s Rule.Crossref | GoogleScholarGoogle Scholar |
Watson, D. M. (2003). Long-term consequences of habitat fragmentation – highland birds in Oaxaca, Mexico. Biological Conservation 111, 283–303.
| Long-term consequences of habitat fragmentation – highland birds in Oaxaca, Mexico.Crossref | GoogleScholarGoogle Scholar |
Wiens, J. A. (1991). Ecological similarity of shrub-desert avifaunas of Australia and North America. Ecology 72, 479–495.
| Ecological similarity of shrub-desert avifaunas of Australia and North America.Crossref | GoogleScholarGoogle Scholar |
Williams, C. K. (1979). Ecology of Australian chats (Epthianura Gould): reproduction in aridity. Australian Journal of Zoology 27, 213–229.
| Ecology of Australian chats (Epthianura Gould): reproduction in aridity.Crossref | GoogleScholarGoogle Scholar |
Williams, C. K., and Main, A. R. (1976). Ecology of Australian chats (Epthianura Gould) – seasonal movements, metabolism and evaporative water-loss. Australian Journal of Zoology 24, 397–416.
| Ecology of Australian chats (Epthianura Gould) – seasonal movements, metabolism and evaporative water-loss.Crossref | GoogleScholarGoogle Scholar |
