Demography and interannual variability of salp swarms (Thalia democratica)

Henschke, N; Everett, JD; Doblin, MA; Pitt, KA; Richardson, AJ; Suthers, IM

Demography and interannual variability of salp swarms (Thalia democratica)

Henschke, N Everett, JD

Doblin, MA

Pitt, KA Richardson, AJ Suthers, IM

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Publication Type:: Journal Article
Citation:: Marine Biology, 2014, 161 (1), pp. 149 - 163
Issue Date:: 2014-01-01

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Field	Value	Language
dc.contributor.author	Henschke, N	en_US
dc.contributor.author	Everett, JD https://orcid.org/0000-0002-6681-8054	en_US
dc.contributor.author	Doblin, MA https://orcid.org/0000-0001-8750-3433	en_US
dc.contributor.author	Pitt, KA	en_US
dc.contributor.author	Richardson, AJ	en_US
dc.contributor.author	Suthers, IM	en_US
dc.date.issued	2014-01-01	en_US
dc.identifier.citation	Marine Biology, 2014, 161 (1), pp. 149 - 163	en_US
dc.identifier.issn	0025-3162	en_US
dc.identifier.uri	http://hdl.handle.net/10453/35878
dc.description.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, 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 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. © 2013 Springer-Verlag Berlin Heidelberg.	en_US
dc.relation.ispartof	Marine Biology	en_US
dc.relation.isbasedon	10.1007/s00227-013-2325-2	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Demography and interannual variability of salp swarms (Thalia democratica)	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	161	en_US
utslib.for	050102 Ecosystem Function	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	161	en_US

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, 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 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. © 2013 Springer-Verlag Berlin Heidelberg.

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http://hdl.handle.net/10453/35878