Quantifying the seed bank of an invasive grass in the sub-Antarctic: seed density, depth, persistence and viability

Williams, Laura K., Kristiansen, Paul, Sindel, Brian M., Wilson, Susan C. and Shaw, Justine D. (2016) Quantifying the seed bank of an invasive grass in the sub-Antarctic: seed density, depth, persistence and viability. Biological Invasions, 18 7: 2093-2106. doi:10.1007/s10530-016-1154-x


Author Williams, Laura K.
Kristiansen, Paul
Sindel, Brian M.
Wilson, Susan C.
Shaw, Justine D.
Title Quantifying the seed bank of an invasive grass in the sub-Antarctic: seed density, depth, persistence and viability
Journal name Biological Invasions   Check publisher's open access policy
ISSN 1573-1464
1387-3547
Publication date 2016-07
Year available 2016
Sub-type Article (original research)
DOI 10.1007/s10530-016-1154-x
Open Access Status Not Open Access
Volume 18
Issue 7
Start page 2093
End page 2106
Total pages 14
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Collection year 2017
Language eng
Formatted abstract
A native to Europe, Poa annua now has a cosmopolitan distribution and is invasive in the sub-Antarctic. As a major weed in temperate turf, there has been considerable investment in research of the species, but little is known about its ecology in the sub-Antarctic, particularly its reproductive ecology and population dynamics. We characterised the seed bank of this invasive species in the sub-Antarctic, by quantifying seed density, depth, persistence and viability. Poa annua seed bank density was correlated with elevation, animal disturbance, soil wetness and soil depth, but most strongly with P. annua cover. Seed bank density was greatest (132,000 seeds m−2) at low altitude coastal sites where P. annua is abundant but declined with increasing altitude to <2600 seeds m2. Seed was most abundant within the top 3 cm of the soil and decreased with soil depth. Seed viability declined over time, from an initial viability of 81 to <3 % after 2 years in the soil. This study demonstrates that whilst P. annua seed banks can be dense, the seed bank is shallow (<10 cm) with low persistence and viability. This first detailed study on the in situ seed bank profile of P. annua in the sub-Antarctic helps us understand the distribution and persistence of this invasive weed and is essential information for the development and implementation of future management. These findings, such as low seed bank persistence, challenge current thinking about eradication or control feasibility in the region.
Keyword Alien
Macquarie Island
Management
Poa annua
Seed burial
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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School of Biological Sciences Publications
 
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