Stable isotope values of mesopelagic fish on the southern Kerguelen Plateau

Brief description

Mesopelagic fish bulk stable isotope data from the Kerguelen Axis ecosystem study (AAS_4344):

These data are based on samples collected as part of the Kerguelen Axis marine ecosystem study (AAS_4344), chief scientist Andrew Constable. This research was supported by the Australian government under the (i) Cooperative Research Centre Program through the Antarctic Climate and Ecosystems Cooperative Research Centre (ACE CRC), (ii) Australian Antarctic Science Program (Projects 4343, 4344, 4347 and 4366), and (iii) Australian Research Council’s Special Research Initiative for Antarctic Gateway Partnership (Project ID SR140300001).

The preferred citation is:

Woods, B., Walters, A., Hindell, M.A., Trebilco, R. (2019) Isotopic insights into mesopelagic niche space and energy pathways on the southern Kerguelen Plateau. Deep Sea Research Part II: Topical Studies in Oceanography

Samples for stable isotope analysis were collected on board the R.S.V Aurora Australis during the austral summer of 2016 (22 January – 17 February) as part of the Kerguelen Axis marine ecosystem study (AAS_4344). Samples were collected from 15 sampling stations along two transects from the Antarctic continental shelf to the BANZARE Bank over the Kerguelen Plateau and in an east to west direction across the Kerguelen Plateau. Mesopelagic fish were sampled from the surface to 1000 m depth using an IYGPT (International Young Gadoid Pelagic Trawl) net equipped with a MIDOC (Mid-water Open Close) multiple cod-end device. Analyses focused on an assemblage including genera from the family Myctophidae (Electrona, Gymnoscopelus, Krefftichthys and Protomyctophum), and the genus Bathylagus from the family Bathylagidae, as these are dominant genera in the Southern Ocean (Pusch et al., 2004; Hulley and Duhamel, 2011; Collins et al., 2012). Muscle tissue from each fish was analysed for δ15N and δ13C.

Collins, M. A., Stowasser, G., Fielding, S., Shreeve, R., Xavier, J. C., Venables, H. J., . . . Van de Putte, A. (2012). Latitudinal and bathymetric patterns in the distribution and abundance of mesopelagic fish in the Scotia Sea. Deep-Sea Research Part Ii-Topical Studies in Oceanography, 59, 189-198. doi:10.1016/j.dsr2.2011.07.003

Hulley, P. A., and Duhamel, G. (2011). Aspects of lanternfish distribution in the Kerguelen Plateau region. The Kerguelen Plateau: marine ecosystems and fisheies. G. Duhamel and DC Welsford, Editors, 183-195.

Pusch, C., Hulley, P. A., and Kock, K. H. (2004). Community structure and feeding ecology of mesopelagic fishes in the slope waters of King George Island (South Shetland Islands, Antarctica). Deep-Sea Research Part I-Oceanographic Research Papers, 51(11), 1685-1708. doi:10.1016/j.dsr.2004.06.008

Lineage

Progress Code: completed

Notes

Purpose
To quantify the isotopic niches of key mesopelagic fish species using δ15N and δ13C; quantitatively assess variation along the δ15N (trophic position) and δ13C (habitat) axes between key mesopelagic fish species, and investigate the community relationship between fish body length and relative trophic position as inferred by δ15N values.