Demography and interannual variability of salp swarms (Thalia democratica)

Henschke, Natasha, Everett, Jason D., Doblin, Martina A., Pitt, Kylie A., Richardson, Anthony J. and Suthers, Iain M. (2014) Demography and interannual variability of salp swarms (Thalia democratica). Marine Biology, 161 1: 149-163. doi:10.1007/s00227-013-2325-2


Author Henschke, Natasha
Everett, Jason D.
Doblin, Martina A.
Pitt, Kylie A.
Richardson, Anthony J.
Suthers, Iain M.
Title Demography and interannual variability of salp swarms (Thalia democratica)
Formatted title
Demography and interannual variability of salp swarms (Thalia democratica)
Journal name Marine Biology   Check publisher's open access policy
ISSN 0025-3162
1432-1793
Publication date 2014-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s00227-013-2325-2
Open Access Status Not yet assessed
Volume 161
Issue 1
Start page 149
End page 163
Total pages 15
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Abstract Swarms of the pelagic tunicate, Thalia democratica, form during spring, but the causes of the large interannual variability in the magnitude of salp swarms are unclear. Changes in asexual reproduction (buds per chain) of T. democratica populations in the coastal waters of south-east Australia (32-35A degrees S) were observed in three austral springs (October 2008-2010). T. democratica abundance was significantly higher in 2008 (1,312 individuals m(-3)) than 2009 and 2010 (210 and 92 individuals m(-3), respectively). There was a significant negative relationship (linear regression, r (2) = 0.61, F (1,22) = 33.83, P < 0.001) between abundance and asexual reproduction. Similarly, relative growth rates declined with decreasing abundance. Generalised additive mixed modelling showed that T. democratica abundance was significantly positively related to preferred food > 2 mu m in size (P < 0.05) and negatively related to the proportion of non-salp zooplankton (P < 0.001). Salp swarm magnitude, growth, and asexual reproduction may depend on the abundance of larger phytoplankton (prymnesiophytes and diatoms) and competition with other zooplankton.
Formatted abstract
Swarms of the pelagic tunicate, Thalia democratica, form during spring, but the causes of the large interannual variability in the magnitude of salp swarms are unclear. Changes in asexual reproduction (buds per chain) of T. democratica populations in the coastal waters of south-east Australia (32-35°S) were observed in three austral springs (October 2008-2010). T. democratica abundance was significantly higher in 2008 (1,312 individuals m-3) than 2009 and 2010 (210 and 92 individuals m-3, respectively). There was a significant negative relationship (linear regression, r 2 = 0.61, F1,22 = 33.83, P < 0.001) between abundance and asexual reproduction. Similarly, relative growth rates declined with decreasing abundance. Generalised additive mixed modelling showed that T. democratica abundance was significantly positively related to preferred food >2 μm in size (P < 0.05) and negatively related to the proportion of non-salp zooplankton (P < 0.001). Salp swarm magnitude, growth, and asexual reproduction may depend on the abundance of larger phytoplankton (prymnesiophytes and diatoms) and competition with other zooplankton.
Keyword Marine & Freshwater Biology
Marine & Freshwater Biology
MARINE & FRESHWATER BIOLOGY
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP0880078
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
 
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