Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/2867
Title: Seed dynamics of resprouting shrubs in grassy woodlands: Seed rain, predators and seed loss constrain recruitment potential
Contributor(s): Campbell, Monica Louise (author); Clarke, Peter John  (author)
Publication Date: 2006
DOI: 10.1111/j.1442-9993.2006.01660.x
Handle Link: https://hdl.handle.net/1959.11/2867
Abstract: Measuring the fate of seeds between seed production and seedling establishment is critical in understanding mechanisms of recruitment limitation of plants. We examined seed fates to better understand the recruitment dynamics of four resprouting shrubs from two families (Fabaceae and Epacridaceae) in temperate grassy woodlands. We tested whether: (1) pre-dispersal seed predation affected seed rain; (ii) post-dispersal seed predation limited seed bank accumulation; (iii) the size of the seed bank was related to seed size; and (iv) viable seeds accumulated in the soil after seed rain. There was a distinct difference in seed production per plant between plant families with the legumes producing significantly more seeds per individual than the epacrids. Seed viability ranged from 43% to 81% and all viable had seed or fruit coat dormancy broken by heat or scarification. Pre-dispersal predation by Lepidopteran larvae removed a large proportion of seed from the legume seed rain but not the epacrids. Four species of ants ('Notoncus ectomoides', 'Pheidole' sp., 'Rhytidoponera tasmaniensis' and 'Iridomyrmex purpureus' were major post-dispersal seed removers. Overall, a greater percentage of 'Hardenbergia' (38%) and 'Pultenaea' (59%) seeds were removed than the fleshy fruits of 'Lissanthe' (14%) or 'Melichrus' (0%). Seed bank sizes were small (<15 seeds⁻²) relative to the seed rain and no significant accumulation of seed in the soil was detected. Lack of accumulation was attributed to seed predation as seed decay was considered unlikely and no seed germination was observed in our study sites. Our study suggests that seed predation is a key factor contributing to seed-limited recruitment in grassy woodland shrubs by reducing the number of seeds stored in the soil.
Publication Type: Journal Article
Source of Publication: Austral Ecology, 31(8), p. 1016-1026
Publisher: Blackwell Publishing
Place of Publication: Carlton South (VIC), Australia
ISSN: 1442-9985
Field of Research (FOR): 060703 Plant Developmental and Reproductive Biology
Socio-Economic Objective (SEO): 960806 Forest and Woodlands Flora, Fauna and Biodiversity
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Other Links: http://nla.gov.au/anbd.bib-an21420942
Statistics to Oct 2018: Visitors: 152
Views: 151
Downloads: 0
Appears in Collections:Journal Article

Files in This Item:
2 files
File Description SizeFormat 
Show full item record

SCOPUSTM   
Citations

18
checked on Nov 26, 2018

Page view(s)

36
checked on Mar 3, 2019
Google Media

Google ScholarTM

Check

Altmetric


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.