Importance of matrix permeability and quantity of core habitat for persistence of a threatened saltmarsh bird

Austral Ecology - Tập 38 Số 3 - Trang 326-337 - 2013
Michael B. Ashcroft1, Richard E. Major1
1Australian Museum, 6 College St, Sydney, NSW 2010, Australia (Email: [email protected])

Tóm tắt

AbstractSpecies habitat preferences can be obscured when individuals have been recorded in non‐core habitats because of dispersal, spillover effects or spatial errors in observation locations. Disentangling the direct effects of the habitats species are observed in from the effects of proximity to other nearby habitats is especially challenging in fragmented landscapes, as many fragmentation metrics are correlated and it is difficult to prove independent effects. In this paper we addressed this issue by comparing a number of models based on predefined ecological theories. We compared models based on quantity of core habitat surrounding observations, proximity to core habitat, or a combination of the two to explain the observed distribution of the saltmarsh inhabiting white‐fronted chat (Epthianura albifrons) in coastal New South Wales, Australia. Proximity to core habitat was considered as either Euclidean distance or cost distance, and models were assessed using Akaike's information criterion and the area under the receiver operator characteristic curve on 10 random subsets of the data. We found that all models performed similarly, with the combination of cost distance and the quantity of saltmarsh performing better, but not significantly so. We compared the advantages and disadvantages of different models and also present a model averaged result. Our models suggested that the majority of saltmarshes in New South Wales were too small to have a large effect on probability of occurrence. As climate change is expected to further reduce the amount of available saltmarsh through continued mangrove incursion, coastal populations of the white‐fronted chat are expected to come under increasing threat. The conversion of grasslands to urban areas may also increase the effective distance between different populations of the species and reduce gene flow and rescue effects.

Từ khóa


Tài liệu tham khảo

10.1016/S0169-2046(02)00242-6

10.1016/j.ecolmodel.2010.10.003

10.1016/j.ecolmodel.2011.12.020

10.1111/j.1466-8238.2007.00331.x

Barrett G. W., 2003, The New Atlas of Australian Birds

10.1890/0012-9658(1998)079[0517:HLAPDA]2.0.CO;2

10.1111/j.1523-1739.2007.00723.x

10.1023/A:1026062530600

10.1890/05-0760

10.1016/j.ecolmodel.2006.05.024

10.1016/j.ecolind.2007.12.002

10.1086/506976

10.1046/j.1523-1739.1995.09061396.x

10.1016/j.ympev.2003.10.017

10.1890/05-0203

10.1016/j.ecolmodel.2004.12.007

10.1146/annurev.ecolsys.34.011802.132419

10.1111/j.0021-8901.2004.00896.x

10.5962/bhl.title.50403

10.2307/5591

Hastie T. J., 1990, Generalized Additive Models

Higgins P. J., 2001, Handbook of Australian, New Zealand & Antarctic Birds. Volume 5, Tyrant‐Flycatchers to Chats

Hoskin E. S., 1991, The Birds of Sydney, County of Cumberland

10.1071/MU10038

10.2307/4357

10.1071/ZO9580053

Keith D., 2002, A Compilation Map of Native Vegetation for New South Wales

10.1007/s10980-009-9375-3

10.1023/A:1008985925162

10.1023/A:1016250716679

10.1111/j.1442-9993.1991.tb01067.x

10.1071/MU9910236

Major R. E., 2012, Is an island reserve enough? The decline and fall of the White‐fronted Chat (Aves: Meliphagidae) in southern Sydney, Proc. Linn. Soc. N. S. W.

10.1016/S0169-5347(00)88977-6

NSWSC(2010a)Final determination to list the White‐fronted ChatEpthianura albifrons(Jardine & Selby 1828) as a vulnerable species. New South Wales Scientific Committee [Cited 9 May 2012.] Available from URL:http://www.environment.nsw.gov.au/determinations/whitefrontedchatvsFD.htm

NSWSC(2010b)Final determination to list a population of the White‐fronted ChatEpthianura albifrons(Jardine & Selby 1828) in the Sydney Metropolitan Catchment Management Authority area as an endangered population. New South Wales Scientific Committee [Cited 9 May 2012.] Available from URL:http://greenhouse.nsw.gov.au/determinations/whitefrontedchatpopFD.htm

10.1371/journal.pone.0019227

10.1111/j.1365-2664.2010.01806.x

10.2307/3802818

10.1071/9780643096844

10.1023/A:1003886725832

10.1071/9780643096844

10.1046/j.1365-2699.1999.00133.x

Saintilan N., 2000, The decline of saltmarsh in southeast Australia: results of recent surveys, Wetlands (Australia), 18, 49, 10.31646/wa.228

Saunders D. A., 1993, Birds of Southwestern Australia

10.1007/s10980-009-9383-3

10.1016/S0304-3800(01)00388-X

10.1071/MU10008

10.1046/j.1523-1739.1999.98059.x

10.1111/j.1466-8238.2010.00586.x

10.1111/j.1523-1739.2008.00926.x

10.1890/07-0196.1

10.1186/1471-2156-11-72

Thông tin
Thông tin xuất bản

Austral Ecology

Tập 38 Số 3

326-337

Thông tin tác giả