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Plasticity in dormancy behaviour of Calanoides acutus in Antarctic coastal waters

Plasticity in dormancy behaviour of Calanoides acutus in Antarctic coastal waters
Plasticity in dormancy behaviour of Calanoides acutus in Antarctic coastal waters
Copepods that enter dormancy, such as Calanoides acutus, are key primary consumers in Southern Ocean food webs where they convert a portion of the seasonal phytoplankton biomass into a longer-term energetic and physiological resource as wax ester (WE) reserves. We studied the seasonal abundance and lipid profiles of pre-adult and adult C. acutus in relation to phytoplankton dynamics on the Western Antarctic Peninsula. Initiation of dormancy occurred when WE unsaturation was relatively high, and chlorophyll a (Chl a) concentrations, predominantly attributable to diatoms, were reducing. Declines in WE unsaturation during the winter may act as a dormancy timing mechanism with increased Chl a concentrations likely to promote sedimentation that results in a teleconnection between the surface and deep water inducing ascent. A late summer diatom bloom was linked to early dormancy termination of females and a second spawning event. The frequency and duration of high biomass phytoplankton blooms may have consequences for the lifespan of the iteroparous C. acutus females (either 1 or 2 years) if limited by a total of two main spawning events. Late summer recruits, generated by a second spawning event, likely benefitted from lower predation and high phytoplankton food availability. The flexibility of copepods to modulate their life-cycle strategy in response to bottom-up and top-down conditions enables individuals to optimize their probability of reproductive success in the very variable environment prevalent in the Southern Ocean.
Copepod, Dormancy, Life cycle, Lipids, Phytoplankton, Wax ester unsaturation
1054-3139
1738-1751
Biggs, Tristan E G
ef004c59-4ca8-402b-aaf7-dced043fe601
Brussaard, Corina P D
433a0c4f-d666-4c89-a1f8-ddbd3aeafc63
Evans, Claire
93350709-cad3-4adf-8483-9bee595412f4
Venables, Hugh J
ed72170e-cf1b-4b38-b5e8-d3eed65cdb06
Pond, David W
0c83d1f3-f262-4ab5-9116-ba19e1056406
Ji, Rubao
527c0d38-fe24-4552-a4b7-45a5ea871dc8
Biggs, Tristan E G
ef004c59-4ca8-402b-aaf7-dced043fe601
Brussaard, Corina P D
433a0c4f-d666-4c89-a1f8-ddbd3aeafc63
Evans, Claire
93350709-cad3-4adf-8483-9bee595412f4
Venables, Hugh J
ed72170e-cf1b-4b38-b5e8-d3eed65cdb06
Pond, David W
0c83d1f3-f262-4ab5-9116-ba19e1056406
Ji, Rubao
527c0d38-fe24-4552-a4b7-45a5ea871dc8

Biggs, Tristan E G, Brussaard, Corina P D, Evans, Claire, Venables, Hugh J, Pond, David W and Ji, Rubao (2020) Plasticity in dormancy behaviour of Calanoides acutus in Antarctic coastal waters. ICES Journal of Marine Science, 77 (5), 1738-1751. (doi:10.1093/icesjms/fsaa042).

Record type: Article

Abstract

Copepods that enter dormancy, such as Calanoides acutus, are key primary consumers in Southern Ocean food webs where they convert a portion of the seasonal phytoplankton biomass into a longer-term energetic and physiological resource as wax ester (WE) reserves. We studied the seasonal abundance and lipid profiles of pre-adult and adult C. acutus in relation to phytoplankton dynamics on the Western Antarctic Peninsula. Initiation of dormancy occurred when WE unsaturation was relatively high, and chlorophyll a (Chl a) concentrations, predominantly attributable to diatoms, were reducing. Declines in WE unsaturation during the winter may act as a dormancy timing mechanism with increased Chl a concentrations likely to promote sedimentation that results in a teleconnection between the surface and deep water inducing ascent. A late summer diatom bloom was linked to early dormancy termination of females and a second spawning event. The frequency and duration of high biomass phytoplankton blooms may have consequences for the lifespan of the iteroparous C. acutus females (either 1 or 2 years) if limited by a total of two main spawning events. Late summer recruits, generated by a second spawning event, likely benefitted from lower predation and high phytoplankton food availability. The flexibility of copepods to modulate their life-cycle strategy in response to bottom-up and top-down conditions enables individuals to optimize their probability of reproductive success in the very variable environment prevalent in the Southern Ocean.

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Accepted/In Press date: 15 February 2020
Published date: 3 April 2020
Keywords: Copepod, Dormancy, Life cycle, Lipids, Phytoplankton, Wax ester unsaturation

Identifiers

Local EPrints ID: 439817
URI: http://eprints.soton.ac.uk/id/eprint/439817
ISSN: 1054-3139
PURE UUID: 3344e8c5-6b2c-44e5-95c8-107df102430a

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Date deposited: 05 May 2020 16:30
Last modified: 26 Apr 2022 19:41

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Contributors

Author: Tristan E G Biggs
Author: Corina P D Brussaard
Author: Claire Evans
Author: Hugh J Venables
Author: David W Pond
Author: Rubao Ji

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