Distribution of life-history stages of the salp Thalia democratica in shelf waters during a spring bloom

Henschke, N; Everett, JD; Baird, ME; Taylor, MD; Suthers, IM

Distribution of life-history stages of the salp Thalia democratica in shelf waters during a spring bloom

Henschke, N Everett, JD

Baird, ME

Taylor, MD Suthers, IM

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Publication Type:: Journal Article
Citation:: Marine Ecology Progress Series, 2011, 430 pp. 49 - 62
Issue Date:: 2011-05-26

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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	Baird, ME https://orcid.org/0000-0003-4955-2298	en_US
dc.contributor.author	Taylor, MD	en_US
dc.contributor.author	Suthers, IM	en_US
dc.date.issued	2011-05-26	en_US
dc.identifier.citation	Marine Ecology Progress Series, 2011, 430 pp. 49 - 62	en_US
dc.identifier.issn	0171-8630	en_US
dc.identifier.uri	http://hdl.handle.net/10453/14982
dc.description.abstract	Swarms of the salp Thalia democratica periodically occur off southeast Australia following the austral spring bloom of phytoplankton. The present study aimed to determine the abundance and size/stage distribution of T. democratica and their relationship with copepods in 3 water types of the western Tasman Sea. Samples were taken from vertical net hauls along 4 cross-shelf transects spaced along 200 km of the New South Wales coast, from the East Australian Current (EAC) sepa - ration zone, around 32.5° S, to off Sydney (34° S). Temperature-salinity signatures grouped stations into 3 distinct water types: inner shelf water, EAC and upwelled water. Although common across all stations, T. democratica was significantly more abundant in inner shelf waters compared to both EAC and upwelled water. Analysis of population structure (aggregate buds, aggregate females, aggregate males, immature solitaries and mature solitaries) also identified higher proportions of reproductive aggregates and their offspring in inner shelf water. This salp population structure was significantly different in the EAC regions, characterised by a paucity of the solitary stages, higher temperatures and lower chlorophyll a concentrations. A weak negative correlation was identified between T. democratica and copepod abundance. In the present study, the maximum abundance of T. democratica was twice the highest globally recorded abundance and 10-fold greater than maximum abundances sampled from the continental shelf and slope waters off southeast Australia during the period from 1938 to 1942. © Inter-Research 2011.	en_US
dc.relation.ispartof	Marine Ecology Progress Series	en_US
dc.relation.isbasedon	10.3354/meps09090	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Distribution of life-history stages of the salp Thalia democratica in shelf waters during a spring bloom	en_US
dc.type	Journal Article
utslib.citation.volume	430	en_US
utslib.for	0602 Ecology	en_US
utslib.for	0405 Oceanography	en_US
utslib.for	0608 Zoology	en_US
dc.location.activity	ISI:000274594300003
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	430	en_US

Abstract:

Swarms of the salp Thalia democratica periodically occur off southeast Australia following the austral spring bloom of phytoplankton. The present study aimed to determine the abundance and size/stage distribution of T. democratica and their relationship with copepods in 3 water types of the western Tasman Sea. Samples were taken from vertical net hauls along 4 cross-shelf transects spaced along 200 km of the New South Wales coast, from the East Australian Current (EAC) sepa - ration zone, around 32.5° S, to off Sydney (34° S). Temperature-salinity signatures grouped stations into 3 distinct water types: inner shelf water, EAC and upwelled water. Although common across all stations, T. democratica was significantly more abundant in inner shelf waters compared to both EAC and upwelled water. Analysis of population structure (aggregate buds, aggregate females, aggregate males, immature solitaries and mature solitaries) also identified higher proportions of reproductive aggregates and their offspring in inner shelf water. This salp population structure was significantly different in the EAC regions, characterised by a paucity of the solitary stages, higher temperatures and lower chlorophyll a concentrations. A weak negative correlation was identified between T. democratica and copepod abundance. In the present study, the maximum abundance of T. democratica was twice the highest globally recorded abundance and 10-fold greater than maximum abundances sampled from the continental shelf and slope waters off southeast Australia during the period from 1938 to 1942. © Inter-Research 2011.

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http://hdl.handle.net/10453/14982