The knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the Southern Ocean: the amphipod Themisto gaudichaudii
The amphipod Themisto gaudichaudii is a so far neglected but key pelagic player in the Southern Ocean. This voracious predator is found along a wide latitudinal gradient with temperatures differing by almost 20°C between its distributional limits. Due to its high abundances, swarm-forming behaviour...
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ftawi:oai:epic.awi.de:52259 2023-05-15T13:45:22+02:00 The knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the Southern Ocean: the amphipod Themisto gaudichaudii Havermans, Charlotte Auel, Holger Held, Christoph Hagen, Wilhelm 2017-07 https://epic.awi.de/id/eprint/52259/ https://hdl.handle.net/10013/epic.5205cf6d-3a51-4801-8259-aba0ad97c6fe unknown Havermans, C. orcid:0000-0002-1126-4074 , Auel, H. , Held, C. orcid:0000-0001-8854-3234 and Hagen, W. (2017) The knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the Southern Ocean: the amphipod Themisto gaudichaudii , SCAR Biology Symposium, Leuven, Belgium, July 2017 - July 2017 . hdl:10013/epic.5205cf6d-3a51-4801-8259-aba0ad97c6fe EPIC3SCAR Biology Symposium, Leuven, Belgium, 2017-07-2017-07 Conference notRev 2017 ftawi 2022-10-02T23:12:39Z The amphipod Themisto gaudichaudii is a so far neglected but key pelagic player in the Southern Ocean. This voracious predator is found along a wide latitudinal gradient with temperatures differing by almost 20°C between its distributional limits. Due to its high abundances, swarm-forming behaviour and importance for higher trophic levels, it is often referred to as krill from the north. Whilst Antarctic krill (Euphausia superba) is more restricted to colder waters further south, T. gaudichaudii is more abundant in northern ice-free zones and is prone to extend its range southwards with the rising water temperatures observed in the Southwest Atlantic sector. In this region, density changes of salps and Antarctic krill have already been noted over the last decades, with krill decreasing whilst salps are on the increase. However, the interactions between the three key players – Themisto, krill and salps – are too little understood to evaluate cascading top-down effects and potential ecological shifts in the Southern Ocean pelagic realm. Knowledge gaps in the biology and ecology of Themisto gaudichaudii are being explored with a focus on its genetic and trophic connectivity. Phylogeographic analyses confirm its spreading potential, showing several well-supported genetic lineages occurring in sympatry and across a wide geographical range. Its feeding ecology is documented by reviewing literature data and applying molecular diet analyses, to verify whether Themisto predates on krill and salps or competes with them for the same resource, i.e. phytoplankton. Finally, consequences of these possible zooplankton range shifts on higher trophic levels are discussed. Conference Object Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The amphipod Themisto gaudichaudii is a so far neglected but key pelagic player in the Southern Ocean. This voracious predator is found along a wide latitudinal gradient with temperatures differing by almost 20°C between its distributional limits. Due to its high abundances, swarm-forming behaviour and importance for higher trophic levels, it is often referred to as krill from the north. Whilst Antarctic krill (Euphausia superba) is more restricted to colder waters further south, T. gaudichaudii is more abundant in northern ice-free zones and is prone to extend its range southwards with the rising water temperatures observed in the Southwest Atlantic sector. In this region, density changes of salps and Antarctic krill have already been noted over the last decades, with krill decreasing whilst salps are on the increase. However, the interactions between the three key players – Themisto, krill and salps – are too little understood to evaluate cascading top-down effects and potential ecological shifts in the Southern Ocean pelagic realm. Knowledge gaps in the biology and ecology of Themisto gaudichaudii are being explored with a focus on its genetic and trophic connectivity. Phylogeographic analyses confirm its spreading potential, showing several well-supported genetic lineages occurring in sympatry and across a wide geographical range. Its feeding ecology is documented by reviewing literature data and applying molecular diet analyses, to verify whether Themisto predates on krill and salps or competes with them for the same resource, i.e. phytoplankton. Finally, consequences of these possible zooplankton range shifts on higher trophic levels are discussed. |
format |
Conference Object |
author |
Havermans, Charlotte Auel, Holger Held, Christoph Hagen, Wilhelm |
spellingShingle |
Havermans, Charlotte Auel, Holger Held, Christoph Hagen, Wilhelm The knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the Southern Ocean: the amphipod Themisto gaudichaudii |
author_facet |
Havermans, Charlotte Auel, Holger Held, Christoph Hagen, Wilhelm |
author_sort |
Havermans, Charlotte |
title |
The knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the Southern Ocean: the amphipod Themisto gaudichaudii |
title_short |
The knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the Southern Ocean: the amphipod Themisto gaudichaudii |
title_full |
The knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the Southern Ocean: the amphipod Themisto gaudichaudii |
title_fullStr |
The knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the Southern Ocean: the amphipod Themisto gaudichaudii |
title_full_unstemmed |
The knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the Southern Ocean: the amphipod Themisto gaudichaudii |
title_sort |
knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the southern ocean: the amphipod themisto gaudichaudii |
publishDate |
2017 |
url |
https://epic.awi.de/id/eprint/52259/ https://hdl.handle.net/10013/epic.5205cf6d-3a51-4801-8259-aba0ad97c6fe |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean |
op_source |
EPIC3SCAR Biology Symposium, Leuven, Belgium, 2017-07-2017-07 |
op_relation |
Havermans, C. orcid:0000-0002-1126-4074 , Auel, H. , Held, C. orcid:0000-0001-8854-3234 and Hagen, W. (2017) The knowns and known unknowns of the ecology and biology of a likely climate-change winner in the warming region of the Southern Ocean: the amphipod Themisto gaudichaudii , SCAR Biology Symposium, Leuven, Belgium, July 2017 - July 2017 . hdl:10013/epic.5205cf6d-3a51-4801-8259-aba0ad97c6fe |
_version_ |
1766223129157304320 |