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Tuesday 17 October 2017

Seeing the wood and the trees—predicting the future for fragmented plant populations in Australian landscapes

Author
Linda Broadhurst A and Andrew Young A B
+ Author Affiliations
Australian Journal of Botany 55(3) 250-260 https://doi.org/10.1071/BT06127
Submitted: 19 June 2006  Accepted: 23 November 2006   Published: 18 May 2007 

Abstract

Australian landscapes face significant environmental challenges in the coming decade. The fragmentation of vegetation following broadscale land-clearing has rapidly altered critical genetic and demographic processes within and among the remnants that still reside in these landscapes. These perturbations threaten the long-term persistence of many species. Although considerable research has been directed towards the management of rare species, little is understood about how common and widespread species respond to these new challenges. In this paper we review the current state of knowledge regarding species biology for some key Australian taxonomic groups to develop broad predictions about the major threats to species persistence, particularly for some of the most common and widespread floral components of fragmented Australian landscapes. The main focus is on associations between reproductive strategy, vulnerability to demographic and genetic threats, and implications for fecundity.

Acknowledgements

 
We thank two anonymous reviewers for their excellent contributions to improving this manuscript.

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Yates CJ, Broadhurst LM (2002) Assessing limitations on population growth in two critically endangered Acacia taxa. Biological Conservation 108, 13–26. 
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Yates CJ, Ladd PG (2004) Breeding system, pollination and demography in the rare granite endemic shrub Verticordia staminosa ssp. staminosa in south-west Western Australia. Austral Ecology 29, 189–200. 
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Yates CJ, Ladd PG (2005) Relative importance of reproductive biology and establishment ecology for persistence of a rare shrub in a fragmented landscape. Conservation Biology 19, 239–249. 

Yeh FC, Brune A, Cheliak WM, Chipman DC (1983) Mating system of Eucalyptus citriodora in a seed-producing area. Canadian Journal of Forest Research 13, 1051–1055. 

Young A, Mitchell N (1994) Microclimate and vegetation edge effects in a fragmented podocarp–broadleaf forest in New Zealand. Biological Conservation 67, 63–72. 
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Young AG, Brown AHD (1996) Comparative population genetic structure of the rare woodland shrub Daviesia suaveolens and its common congener D. mimosoides. Conservation Biology 10, 1220–1228. 
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Young AG, Brown AHD (1999) Paternal bottlenecks in fragmented populations of the endangered grassland herb: Rutidosis leptorrhynchoides. Genetical Research 73, 111–117. 
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Young AG, Boyle TJB, Brown T (1996) The population genetic consequences of habitat fragmentation for plants. Trends in Ecology & Evolution 11, 413–417. 
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Young AG, Brown AHD, Zich FA (1999) Genetic structure of fragmented populations of the endangered daisy Rutidosis leptorrhynchoides. Conservation Genetics 13, 256–265. 

Young AG Brown AHD Murray BG Thrall PH Miller C (2000) Genetic erosion, restricted mating and reduced viability in fragmented populations of the endangered grassland herb Rutidosis leptorrhynchoides. In ‘Genetics, demography and viability of fragmented populations’. (Eds AG Young, GM Clarke) pp. 335–359. (Cambridge University Press: Cambridge) 

Young AG, Hill JH, Murray BG, Peakall R (2002) Breeding system, genetic diversity and clonal structure in the sub-alpine forb Rutidosis leiolepis F.Muell. (Asteraceae). Biological Conservation 106, 71–78. 
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Zoro Bi I, Maquet A, Baudoin J-P (2003) Population genetic structure of wild Phaseolus lunatus (Fabaceae), with special reference to population sizes. American Journal of Botany 90, 897–904. 

For further details log on website :
http://www.publish.csiro.au/BT/BT06127

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