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Protocols in ecological and environmental plant physiology

 

Article << Previous     |     Next >>   Contents Vol 60(7)

The importance of recruitment patterns versus reproductive output in the persistence of a short-range endemic shrub in a highly fragmented landscape of south-western Australia

Neil Gibson A B, Colin Yates A, Margaret Byrne A, Margaret Langley A and Rujiporn Thavornkanlapachai A

A Science Division, Department of Environment and Conservation, LMB 104 Bentley Delivery Centre, WA 6983, Australia.
B Corresponding author. Email: Neil.Gibson@dec.wa.gov.au

Australian Journal of Botany 60(7) 643-649 http://dx.doi.org/10.1071/BT12194
Submitted: 19 July 2012  Accepted: 16 September 2012   Published: 25 October 2012


 
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Abstract

Calothamnus quadrifidus subsp. teretifolius A.S.George & N.Gibson is a short-range endemic shrub whose habitat has been greatly reduced by clearing for agriculture. Reproductive output was high in all populations sampled, although there were large differences among populations in fruit set, the number of seeds per fruit and seed germination. These traits showed no relationship to population size, degree of isolation, or fragment size, which contrasts strongly with the patterns found in a widespread congener. Demographic studies in remnants with an intact understorey showed stable adult populations with continuous seedling recruitment. In contrast, there was consistent widespread failure of seedling and juvenile recruitment in degraded roadside remnants that also showed significant mortality of reproductive adults. In these degraded remnants, recruitment failure appears to be the primary cause of species decline.



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