Population dynamics of Themisto gaudichaudii in Kerguelen Islands waters, Southern Indian Ocean

Fieldwork was carried out at Kerguelen Islands. Two groups of stations in a coastal area, the Morbihan gulf, were surveyed. At both stations, macroplankton biomass ranged from 2.3 mg dry weight m(-3) to 89 mg dry weight m(-3) and consisted mostly of Themisto gaudichaudii with values ranging from 1.9...

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Bibliographic Details
Published in:Polar Biology
Main Authors: Labat, Jp, Mayzaud, P, Sabini, S
Other Authors: Laboratoire d'océanographie de Villefranche (LOV), Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2005
Subjects:
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Antarctic
Kerguelen
Kerguelen Islands
Indian
Gulf of Morbihan
Antarc*
Polar Biology
Online Access:https://hal.science/hal-03494203
https://doi.org/10.1007/s00300-005-0003-7
Description
Summary:Fieldwork was carried out at Kerguelen Islands. Two groups of stations in a coastal area, the Morbihan gulf, were surveyed. At both stations, macroplankton biomass ranged from 2.3 mg dry weight m(-3) to 89 mg dry weight m(-3) and consisted mostly of Themisto gaudichaudii with values ranging from 1.9 mg dry weight m(-3) to 50.6 mg dry weight m(-3). Biomass was high for sub-Antarctic waters with marked seasonal and inter-zone differences. Biomass minima were observed at the end of the winter, from September to November, while maxima were recorded in summer and in early fall at the beginning of the year between January and April. T. gaudichaudii showed a recruitment of new size classes, mainly from November to January, followed by a rapid growth phase in summer, which slowed down during the southern winter period. Individuals breed after 1 year. Large individuals, older than 1 year, were not a significant presence in the gulf of Morbihan. The main pattern of the population dynamics were characterised by an univoltine life cycle with a very high biomass marked by a strong seasonal signal linked with the hydrological and trophic parameters of the Gulf.

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