New confirmed depth-limit of Antarctic macroalgae: Palmaria decipiens found at 100 m depth in the Southern Ocean

Ben Jamie Owen  Robinson; Simon Morley; Anastasia Rizouli; Joanne  Sarantopoulou; George A.  Gkafas; Athanasios  Exadactylos; Frithjof Kuepper

doi:10.1007/s00300-022-03071-y

New confirmed depth-limit of Antarctic macroalgae: Palmaria decipiens found at 100 m depth in the Southern Ocean

Ben Jamie Owen Robinson^* (Corresponding Author), Simon Morley, Anastasia Rizouli, Joanne Sarantopoulou, George A. Gkafas, Athanasios Exadactylos, Frithjof Kuepper

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Living specimens of the macroalga Palmaria decipiens were collected from 100 m depth, representing a new confirmed depth record, considerably exceeding the previous record of 42 m depth. Previous deeper collections (below conventional SCUBA depths) have relied on dredge/grab samples or drop camera surveys. Remote techniques cannot conclusively prove that macroalgae are living at these depths, as algae detach from shallower substrata, e.g., through ice scouring, and drift to depths below their growth limit. This, combined with a low rate of decay of macroalgae around Antarctica, requires validation that algal samples from depth have grown in situ. Estimates of macroalgal biomass, energy fluxes, and the potential energy fixation may need adjusting to consider the deeper growing depths particularly with glacial retreat along the Antarctic Peninsula revealing areas of rocky substrata for macroalgal colonisation. The confirmed extension of depth where macroalgae can grow will have implications for assessments of benthic productivity and food webs in Antarctica.

Original language	English
Pages (from-to)	1459-1463
Number of pages	5
Journal	Polar Biology
Volume	45
Issue number	12
Early online date	3 Aug 2022
DOIs	https://doi.org/10.1007/s00300-022-03071-y
Publication status	Published - Aug 2022

Keywords

Macrophytobenthos
molecular phylogeny
Rhodophyta
ROV
Depth limit
Algae
Benthos

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Cite this

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title = "New confirmed depth-limit of Antarctic macroalgae: Palmaria decipiens found at 100 m depth in the Southern Ocean",

abstract = "Living specimens of the macroalga Palmaria decipiens were collected from 100 m depth, representing a new confirmed depth record, considerably exceeding the previous record of 42 m depth. Previous deeper collections (below conventional SCUBA depths) have relied on dredge/grab samples or drop camera surveys. Remote techniques cannot conclusively prove that macroalgae are living at these depths, as algae detach from shallower substrata, e.g., through ice scouring, and drift to depths below their growth limit. This, combined with a low rate of decay of macroalgae around Antarctica, requires validation that algal samples from depth have grown in situ. Estimates of macroalgal biomass, energy fluxes, and the potential energy fixation may need adjusting to consider the deeper growing depths particularly with glacial retreat along the Antarctic Peninsula revealing areas of rocky substrata for macroalgal colonisation. The confirmed extension of depth where macroalgae can grow will have implications for assessments of benthic productivity and food webs in Antarctica.",

keywords = "Macrophytobenthos, molecular phylogeny, Rhodophyta, ROV, Depth limit, Algae, Benthos",

author = "Robinson, {Ben Jamie Owen} and Simon Morley and Anastasia Rizouli and Joanne Sarantopoulou and Gkafas, {George A.} and Athanasios Exadactylos and Frithjof Kuepper",

note = "Acknowledgements: We would like to acknowledge the summer and winter teams at Rothera Research Station (2016-2018) for their 169 support. We would also like to thank the two reviewers including Sandra Lindstrom, who helped improve this manuscript. Funding Information: This study was funded by the Natural Environmental Research Council (NERC) core funding to the funding to the Biodiversity, Evolution and Adaptations Team of the British Antarctic Survey. FCK was also supported by the Marine Alliance for Science and Technology for Scotland pooling initiative (MASTS), the latter funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. We are also grateful to the UK NERC for funding FCK through the Collaborative Antarctic Science Scheme (Grant CASS-134, 2017)",

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doi = "10.1007/s00300-022-03071-y",

language = "English",

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T2 - Palmaria decipiens found at 100 m depth in the Southern Ocean

AU - Robinson, Ben Jamie Owen

AU - Morley, Simon

AU - Rizouli, Anastasia

AU - Sarantopoulou, Joanne

AU - Gkafas, George A.

AU - Exadactylos, Athanasios

AU - Kuepper, Frithjof

N1 - Acknowledgements: We would like to acknowledge the summer and winter teams at Rothera Research Station (2016-2018) for their 169 support. We would also like to thank the two reviewers including Sandra Lindstrom, who helped improve this manuscript. Funding Information: This study was funded by the Natural Environmental Research Council (NERC) core funding to the funding to the Biodiversity, Evolution and Adaptations Team of the British Antarctic Survey. FCK was also supported by the Marine Alliance for Science and Technology for Scotland pooling initiative (MASTS), the latter funded by the Scottish Funding Council (grant reference HR09011) and contributing institutions. We are also grateful to the UK NERC for funding FCK through the Collaborative Antarctic Science Scheme (Grant CASS-134, 2017)

PY - 2022/8

Y1 - 2022/8

N2 - Living specimens of the macroalga Palmaria decipiens were collected from 100 m depth, representing a new confirmed depth record, considerably exceeding the previous record of 42 m depth. Previous deeper collections (below conventional SCUBA depths) have relied on dredge/grab samples or drop camera surveys. Remote techniques cannot conclusively prove that macroalgae are living at these depths, as algae detach from shallower substrata, e.g., through ice scouring, and drift to depths below their growth limit. This, combined with a low rate of decay of macroalgae around Antarctica, requires validation that algal samples from depth have grown in situ. Estimates of macroalgal biomass, energy fluxes, and the potential energy fixation may need adjusting to consider the deeper growing depths particularly with glacial retreat along the Antarctic Peninsula revealing areas of rocky substrata for macroalgal colonisation. The confirmed extension of depth where macroalgae can grow will have implications for assessments of benthic productivity and food webs in Antarctica.

AB - Living specimens of the macroalga Palmaria decipiens were collected from 100 m depth, representing a new confirmed depth record, considerably exceeding the previous record of 42 m depth. Previous deeper collections (below conventional SCUBA depths) have relied on dredge/grab samples or drop camera surveys. Remote techniques cannot conclusively prove that macroalgae are living at these depths, as algae detach from shallower substrata, e.g., through ice scouring, and drift to depths below their growth limit. This, combined with a low rate of decay of macroalgae around Antarctica, requires validation that algal samples from depth have grown in situ. Estimates of macroalgal biomass, energy fluxes, and the potential energy fixation may need adjusting to consider the deeper growing depths particularly with glacial retreat along the Antarctic Peninsula revealing areas of rocky substrata for macroalgal colonisation. The confirmed extension of depth where macroalgae can grow will have implications for assessments of benthic productivity and food webs in Antarctica.

KW - Macrophytobenthos

KW - molecular phylogeny

KW - Rhodophyta

KW - ROV

KW - Depth limit

KW - Algae

KW - Benthos

U2 - 10.1007/s00300-022-03071-y

DO - 10.1007/s00300-022-03071-y

M3 - Article

VL - 45

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EP - 1463

JO - Polar Biology

JF - Polar Biology

SN - 0722-4060

IS - 12

ER -

New confirmed depth-limit of Antarctic macroalgae: Palmaria decipiens found at 100 m depth in the Southern Ocean

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Keywords

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