New observations on the Antarctic Asteromphalus darwinii/hookeri diatom species-complex (Asterolampraceae)
Abstract Antarctic diatom populations of Asteromphalus hookeri and related species such as A. hyalinus and A. parvulus exhibit a highly variable number of hyaline rays ranging from 3 broad + 1 narrow (3 + 1) in the smallest valves, with 4 + 1 (27%) and 5 + 1 rays (35%) most common, and 6 + 1, 7 + 1,...
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ftunivtoulon:oai:HAL:hal-04292684v1 2023-12-31T09:59:32+01:00 New observations on the Antarctic Asteromphalus darwinii/hookeri diatom species-complex (Asterolampraceae) Hallegraeff, Gustaaf Leblanc, Karine Institute for Marine and Antarctic Studies Hobart (IMAS) University of Tasmania Hobart, Australia (UTAS) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) 2023-06-21 https://hal.science/hal-04292684 https://hal.science/hal-04292684/document https://hal.science/hal-04292684/file/s00300-023-03160-6.pdf https://doi.org/10.1007/s00300-023-03160-6 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-023-03160-6 hal-04292684 https://hal.science/hal-04292684 https://hal.science/hal-04292684/document https://hal.science/hal-04292684/file/s00300-023-03160-6.pdf doi:10.1007/s00300-023-03160-6 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0722-4060 EISSN: 1432-2056 Polar Biology https://hal.science/hal-04292684 Polar Biology, 2023, 46 (8), pp.759-772. ⟨10.1007/s00300-023-03160-6⟩ [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2023 ftunivtoulon https://doi.org/10.1007/s00300-023-03160-6 2023-12-05T23:35:36Z Abstract Antarctic diatom populations of Asteromphalus hookeri and related species such as A. hyalinus and A. parvulus exhibit a highly variable number of hyaline rays ranging from 3 broad + 1 narrow (3 + 1) in the smallest valves, with 4 + 1 (27%) and 5 + 1 rays (35%) most common, and 6 + 1, 7 + 1, and rarely 8 + 1 rays only in larger cells. During December 1959 to April 1960 in the southern sector of the Atlantic Ocean, 6% of valves occurred as “double forms” with epitheca and hypotheca of the same cell exhibiting 4 + 1/3 + 1, 5 + 1/4 + 1, 6 + 1/5 + 1 and 7 + 1/6 + 1 ray combinations. Smaller cells (3 + 1, 4 + 1) always exhibited jagged separating lines in the central area, but larger cells (7 + 1, 8 + 1) had mostly smooth lines, and either jagged or smooth separating lines occurred in intermediate 5 + 1 and 6 + 1 forms, respectively. Epitheca and hypotheca of one and the same cell always exhibited jagged or smooth separating lines, but never mixtures. Observations of silica deposition during October to November 2011 around the Kerguelen Island plateau using the PDMPO fluorescent marker suggest that Asteromphalus separating lines play a key role in silica cell wall development. We discuss implications for taxonomy of what we designate as two highly variable and often confused and overlapping cold-water diatom taxa, A. darwinii (jagged separating lines; synonyms A. beaumontii, A. hyalinus, A. leboimei , A. parvulus, A. rossii ) and A. hookeri (smooth separating lines; synonyms A. antarcticus, A. buchii ). Article in Journal/Newspaper Antarc* Antarctic antarcticus Polar Biology Université de Toulon: HAL Polar Biology 46 8 759 772 |
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Open Polar |
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Université de Toulon: HAL |
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ftunivtoulon |
language |
English |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE]Environmental Sciences |
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[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE]Environmental Sciences Hallegraeff, Gustaaf Leblanc, Karine New observations on the Antarctic Asteromphalus darwinii/hookeri diatom species-complex (Asterolampraceae) |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE]Environmental Sciences |
description |
Abstract Antarctic diatom populations of Asteromphalus hookeri and related species such as A. hyalinus and A. parvulus exhibit a highly variable number of hyaline rays ranging from 3 broad + 1 narrow (3 + 1) in the smallest valves, with 4 + 1 (27%) and 5 + 1 rays (35%) most common, and 6 + 1, 7 + 1, and rarely 8 + 1 rays only in larger cells. During December 1959 to April 1960 in the southern sector of the Atlantic Ocean, 6% of valves occurred as “double forms” with epitheca and hypotheca of the same cell exhibiting 4 + 1/3 + 1, 5 + 1/4 + 1, 6 + 1/5 + 1 and 7 + 1/6 + 1 ray combinations. Smaller cells (3 + 1, 4 + 1) always exhibited jagged separating lines in the central area, but larger cells (7 + 1, 8 + 1) had mostly smooth lines, and either jagged or smooth separating lines occurred in intermediate 5 + 1 and 6 + 1 forms, respectively. Epitheca and hypotheca of one and the same cell always exhibited jagged or smooth separating lines, but never mixtures. Observations of silica deposition during October to November 2011 around the Kerguelen Island plateau using the PDMPO fluorescent marker suggest that Asteromphalus separating lines play a key role in silica cell wall development. We discuss implications for taxonomy of what we designate as two highly variable and often confused and overlapping cold-water diatom taxa, A. darwinii (jagged separating lines; synonyms A. beaumontii, A. hyalinus, A. leboimei , A. parvulus, A. rossii ) and A. hookeri (smooth separating lines; synonyms A. antarcticus, A. buchii ). |
author2 |
Institute for Marine and Antarctic Studies Hobart (IMAS) University of Tasmania Hobart, Australia (UTAS) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Hallegraeff, Gustaaf Leblanc, Karine |
author_facet |
Hallegraeff, Gustaaf Leblanc, Karine |
author_sort |
Hallegraeff, Gustaaf |
title |
New observations on the Antarctic Asteromphalus darwinii/hookeri diatom species-complex (Asterolampraceae) |
title_short |
New observations on the Antarctic Asteromphalus darwinii/hookeri diatom species-complex (Asterolampraceae) |
title_full |
New observations on the Antarctic Asteromphalus darwinii/hookeri diatom species-complex (Asterolampraceae) |
title_fullStr |
New observations on the Antarctic Asteromphalus darwinii/hookeri diatom species-complex (Asterolampraceae) |
title_full_unstemmed |
New observations on the Antarctic Asteromphalus darwinii/hookeri diatom species-complex (Asterolampraceae) |
title_sort |
new observations on the antarctic asteromphalus darwinii/hookeri diatom species-complex (asterolampraceae) |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04292684 https://hal.science/hal-04292684/document https://hal.science/hal-04292684/file/s00300-023-03160-6.pdf https://doi.org/10.1007/s00300-023-03160-6 |
genre |
Antarc* Antarctic antarcticus Polar Biology |
genre_facet |
Antarc* Antarctic antarcticus Polar Biology |
op_source |
ISSN: 0722-4060 EISSN: 1432-2056 Polar Biology https://hal.science/hal-04292684 Polar Biology, 2023, 46 (8), pp.759-772. ⟨10.1007/s00300-023-03160-6⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00300-023-03160-6 hal-04292684 https://hal.science/hal-04292684 https://hal.science/hal-04292684/document https://hal.science/hal-04292684/file/s00300-023-03160-6.pdf doi:10.1007/s00300-023-03160-6 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1007/s00300-023-03160-6 |
container_title |
Polar Biology |
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46 |
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8 |
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759 |
op_container_end_page |
772 |
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