FN Archimer Export Format
PT J
TI New observations on the Antarctic Asteromphalus darwinii/ hookeri diatom species-complex (Asterolampraceae)
OT Nouvelles observations sur le complexe d'espèces de diatomées Asteromphalus darwinii/hookeri de l'Antarctique ( Asterolampraceae )
BT 
AF Hallegraeff, Gustaaf
   LeBlanc, Karine
AS 1:1;2:2;
FF 1:;2:;
C1 Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, TAS 7001, Australia
   Aix Marseille Université, Université de Toulon, CNRS, IRD, MIO UM 110, 13288 Marseille, France
C2 UNIV TASMANIA, AUSTRALIA
   UNIV TOULON, FRANCE
IF 1.7
TC 0
UR https://archimer.ifremer.fr/doc/00799/91140/96822.pdf
   https://archimer.ifremer.fr/doc/00799/91140/103848.pdf
LA English
DT Article
CR MD 188 / KEOPS 2
BO Marion Dufresne
DE ;Antarctic diatoms;Asteromphalus hookeri;Asteromphalus darwinii
AB 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). 
PY 2023
PD AUG
SO Polar Biology
SN 0722-4060
PU Springer
VL 46
IS 8
UT 001013729400001
BP 759
EP 772
DI 10.1007/s00300-023-03160-6
ID 91140
ER

EF