Thysanoessa macrura in the southern Kerguelen region: population dynamics and biomass
Thysanoessa macrura is well adapted to the strong seasonality of the Southern Ocean. A flexible diet, large lipid reserves and a winter reproductive period provide T. macrura with the ability to capitalise on the pulses of primary and secondary reproduction in spring and summer. The population dynam...
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Online Access: | https://doi.org/10.1016/j.dsr2.2019.104719 http://ecite.utas.edu.au/137491 |
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ftunivtasecite:oai:ecite.utas.edu.au:137491 2023-05-15T18:25:08+02:00 Thysanoessa macrura in the southern Kerguelen region: population dynamics and biomass Wallis, JR Maschette, D Wotherspoon, S Kawaguchi, S Swadling, KM 2020 https://doi.org/10.1016/j.dsr2.2019.104719 http://ecite.utas.edu.au/137491 en eng Pergamon-Elsevier Science Ltd http://dx.doi.org/10.1016/j.dsr2.2019.104719 Wallis, JR and Maschette, D and Wotherspoon, S and Kawaguchi, S and Swadling, KM, Thysanoessa macrura in the southern Kerguelen region: population dynamics and biomass, Deep-Sea Research: Part II, 174 Article 104719. ISSN 0967-0645 (2020) [Refereed Article] http://ecite.utas.edu.au/137491 Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) Refereed Article PeerReviewed 2020 ftunivtasecite https://doi.org/10.1016/j.dsr2.2019.104719 2022-04-11T22:16:43Z Thysanoessa macrura is well adapted to the strong seasonality of the Southern Ocean. A flexible diet, large lipid reserves and a winter reproductive period provide T. macrura with the ability to capitalise on the pulses of primary and secondary reproduction in spring and summer. The population dynamics of T. macrura were examined over the southern Kerguelen Plateau region as part of a large-scale ecosystem assessment. Larval stages were present in high abundances, exceeding 4000 Ind. 1000 m −3 , with a peak in early furcilia (FI−FIV) and lower abundances of calyptopis stages (CI−CIII) indicating the end of a prolonged spawning period. High abundances of T. macrura were recorded throughout the entire study region, although they tended to be highest over the southern extent of the Banzare Bank and Princess Elizabeth Trough. This maximum appeared to be driven by the presence of the copepod Calanoides acutus , a dominant prey source. The first biomass estimates of T. macrura were determined for the region using length-frequency and abundance distributions. A mean biomass of 1.66mgm −3 (wet weight) was calculated for the region, however localised biomass over the southern tip of the Banzare Bank exceeded 9mgm −3 in the upper 200m of the water column. The high biomass of T. macrura highlights their significance as an energy-rich resource for larger predators, inferring they play a currently underappreciated role in pelagic food-webs of the Southern Ocean. Article in Journal/Newspaper Southern Ocean Thysanoessa macrura eCite UTAS (University of Tasmania) Southern Ocean Kerguelen Princess Elizabeth Trough ENVELOPE(83.000,83.000,-64.167,-64.167) Banzare Bank ENVELOPE(77.733,77.733,-58.833,-58.833) Deep Sea Research Part II: Topical Studies in Oceanography 174 104719 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) Wallis, JR Maschette, D Wotherspoon, S Kawaguchi, S Swadling, KM Thysanoessa macrura in the southern Kerguelen region: population dynamics and biomass |
topic_facet |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) |
description |
Thysanoessa macrura is well adapted to the strong seasonality of the Southern Ocean. A flexible diet, large lipid reserves and a winter reproductive period provide T. macrura with the ability to capitalise on the pulses of primary and secondary reproduction in spring and summer. The population dynamics of T. macrura were examined over the southern Kerguelen Plateau region as part of a large-scale ecosystem assessment. Larval stages were present in high abundances, exceeding 4000 Ind. 1000 m −3 , with a peak in early furcilia (FI−FIV) and lower abundances of calyptopis stages (CI−CIII) indicating the end of a prolonged spawning period. High abundances of T. macrura were recorded throughout the entire study region, although they tended to be highest over the southern extent of the Banzare Bank and Princess Elizabeth Trough. This maximum appeared to be driven by the presence of the copepod Calanoides acutus , a dominant prey source. The first biomass estimates of T. macrura were determined for the region using length-frequency and abundance distributions. A mean biomass of 1.66mgm −3 (wet weight) was calculated for the region, however localised biomass over the southern tip of the Banzare Bank exceeded 9mgm −3 in the upper 200m of the water column. The high biomass of T. macrura highlights their significance as an energy-rich resource for larger predators, inferring they play a currently underappreciated role in pelagic food-webs of the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Wallis, JR Maschette, D Wotherspoon, S Kawaguchi, S Swadling, KM |
author_facet |
Wallis, JR Maschette, D Wotherspoon, S Kawaguchi, S Swadling, KM |
author_sort |
Wallis, JR |
title |
Thysanoessa macrura in the southern Kerguelen region: population dynamics and biomass |
title_short |
Thysanoessa macrura in the southern Kerguelen region: population dynamics and biomass |
title_full |
Thysanoessa macrura in the southern Kerguelen region: population dynamics and biomass |
title_fullStr |
Thysanoessa macrura in the southern Kerguelen region: population dynamics and biomass |
title_full_unstemmed |
Thysanoessa macrura in the southern Kerguelen region: population dynamics and biomass |
title_sort |
thysanoessa macrura in the southern kerguelen region: population dynamics and biomass |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2020 |
url |
https://doi.org/10.1016/j.dsr2.2019.104719 http://ecite.utas.edu.au/137491 |
long_lat |
ENVELOPE(83.000,83.000,-64.167,-64.167) ENVELOPE(77.733,77.733,-58.833,-58.833) |
geographic |
Southern Ocean Kerguelen Princess Elizabeth Trough Banzare Bank |
geographic_facet |
Southern Ocean Kerguelen Princess Elizabeth Trough Banzare Bank |
genre |
Southern Ocean Thysanoessa macrura |
genre_facet |
Southern Ocean Thysanoessa macrura |
op_relation |
http://dx.doi.org/10.1016/j.dsr2.2019.104719 Wallis, JR and Maschette, D and Wotherspoon, S and Kawaguchi, S and Swadling, KM, Thysanoessa macrura in the southern Kerguelen region: population dynamics and biomass, Deep-Sea Research: Part II, 174 Article 104719. ISSN 0967-0645 (2020) [Refereed Article] http://ecite.utas.edu.au/137491 |
op_doi |
https://doi.org/10.1016/j.dsr2.2019.104719 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
174 |
container_start_page |
104719 |
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1766206354544918528 |