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The pelagic squid assemblage of the Kerguelen Axis
Citation
Lin, D and Trebilco, R and Walters, A and Zhu, G and Chen, X, The pelagic squid assemblage of the Kerguelen Axis, The Kerguelen Plateau: marine ecosystem and fisheries. Proceedings of the Second Symposium, 13-15 November 2017, Hobart, pp. 43-44. ISBN 9781876934309 (2019) [Refereed Conference Paper]
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Copyright Statement
Copyright 2017 The Department of the Environment and Energy, Australian Antarctic Division
Official URL: http://heardisland.antarctica.gov.au/research/kerg...
Abstract
Squids are increasingly acknowledged as an ecologically important group in Southern
Ocean ecosystems, and most are represented exclusively by endemic species due to
the biological barrier of Antarctic Polar Front. However, there are still large gaps in
their now-known biogeographic components, especially the population diversity in the
Indian sector. We thus present a first evaluation of diversity and distribution of the squid
populations in the Kerguelen Plateau, based on an ecosystem study of the Kerguelen Axis
conducted between January and February 2016. A total of 801 squid specimens were
collected from 36 stations, at depths from the surface to 1 000 m and were identified
to seven species from six families, including Alluroteuthis antarcticus, Bathyteuthis
abyssicola, Galiteuthis glacialis, Mastigoteuthis psychrophila, Mesonychoteuthis
hamiltoni, Psychroteuthis glacialis and Slosarczykovia circumantarctica. Species
composition was dominated by G. glacialis and P. glacialis, which accounted for 68.79%
and 11.24% of the total collection respectively. We examined geographic niche breadth
of these species in terms of their distributions across stations and with depth. All of these
species exhibited a broad niche breadth, being the Shannon-Wiener’s niche breadth index
(Bi) from 1.91 to 8.43. Variations of diversity index were estimated in a range of 0.39
to 1.56, and most of the peak diversity stations were found at the short deep-sea slope area
and deep-sea basin. This variation was consistent with the bathymetric gradient of depth,
although the relationship was not statistically significant. In addition, the highest diversity
was detected in the top 200 m of the water column, with an occurrence >50% for most
species at this depth stratum. This study demonstrates the squids’ population diversity in
the southern Kerguelen Plateau, with new insights into their endemicity and diversity in
this biologically important area.
Item Details
Item Type: | Refereed Conference Paper |
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Keywords: | squids, biodiversity, endemicity, Kerguelen Plateau, Southern Ocean |
Research Division: | Biological Sciences |
Research Group: | Ecology |
Research Field: | Marine and estuarine ecology (incl. marine ichthyology) |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the biological sciences |
UTAS Author: | Trebilco, R (Dr Rowan Trebilco) |
UTAS Author: | Walters, A (Dr Andrea Walters) |
ID Code: | 128586 |
Year Published: | 2019 |
Deposited By: | Ecology and Biodiversity |
Deposited On: | 2018-10-01 |
Last Modified: | 2020-01-10 |
Downloads: | 19 View Download Statistics |
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