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Marine-derived dinoflagellates in Antarctic saline lakes: annual dynamics and community composition

Rengefors, Karin LU ; Laybourn-Parry, Johanna; Logares, Ramiro LU and Hansen, Gert (2008) In Journal of Phycology 44(3). p.592-604
Abstract
The saline lakes of the Vestfold Hills in Antarctica offer a remarkable natural laboratory where the adaptation of planktonic protists to a range of evolving physiochemical conditions can be investigated. This study illustrates how an ancestral marine community has undergone radical simplification leaving a small number of well-adapted species. Our objective was to investigate the species composition and annual dynamics of dinoflagellate communities in three saline Antarctic lakes. We observed that dinoflagellates occur year-round despite extremely low PAR during the southern winter, which suggests significant mixotrophic or heterotrophic activity. Only a small number of dominant dinoflagellate species were found in each lake, in contrast... (More)
The saline lakes of the Vestfold Hills in Antarctica offer a remarkable natural laboratory where the adaptation of planktonic protists to a range of evolving physiochemical conditions can be investigated. This study illustrates how an ancestral marine community has undergone radical simplification leaving a small number of well-adapted species. Our objective was to investigate the species composition and annual dynamics of dinoflagellate communities in three saline Antarctic lakes. We observed that dinoflagellates occur year-round despite extremely low PAR during the southern winter, which suggests significant mixotrophic or heterotrophic activity. Only a small number of dominant dinoflagellate species were found in each lake, in contrast to the species-rich Southern Ocean from which the lake communities are believed to be derived. We verified that the lake species were representatives of the marine polar dinoflagellate community, and not freshwater species. Polarella glacialis Montresor, Procaccini et Stoecker, a bipolar marine species, was for the first time described in a lake habitat and was an important phototrophic component in the higher salinity lakes. In the brackish lakes, we found a new sibling species to the brackish-water species Scrippsiella hangoei (J. Schiller) J. Larsen, previously observed only in the Baltic Sea. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Antarctica, cold-water dinoflagellates, dinoflagellate dynamics, polar, Polarella glacialis, saline lakes, Scrippsiella hangoei
in
Journal of Phycology
volume
44
issue
3
pages
592 - 604
publisher
Wiley-Blackwell
external identifiers
  • wos:000256123700006
  • scopus:44349092012
ISSN
0022-3646
DOI
10.1111/j.1529-8817.2008.00517.x
language
English
LU publication?
yes
id
9b922bc6-7d73-49af-8de5-e1ee7d6116ae (old id 628745)
date added to LUP
2007-12-11 12:58:48
date last changed
2017-01-01 04:20:41
@article{9b922bc6-7d73-49af-8de5-e1ee7d6116ae,
  abstract     = {The saline lakes of the Vestfold Hills in Antarctica offer a remarkable natural laboratory where the adaptation of planktonic protists to a range of evolving physiochemical conditions can be investigated. This study illustrates how an ancestral marine community has undergone radical simplification leaving a small number of well-adapted species. Our objective was to investigate the species composition and annual dynamics of dinoflagellate communities in three saline Antarctic lakes. We observed that dinoflagellates occur year-round despite extremely low PAR during the southern winter, which suggests significant mixotrophic or heterotrophic activity. Only a small number of dominant dinoflagellate species were found in each lake, in contrast to the species-rich Southern Ocean from which the lake communities are believed to be derived. We verified that the lake species were representatives of the marine polar dinoflagellate community, and not freshwater species. Polarella glacialis Montresor, Procaccini et Stoecker, a bipolar marine species, was for the first time described in a lake habitat and was an important phototrophic component in the higher salinity lakes. In the brackish lakes, we found a new sibling species to the brackish-water species Scrippsiella hangoei (J. Schiller) J. Larsen, previously observed only in the Baltic Sea.},
  author       = {Rengefors, Karin and Laybourn-Parry, Johanna and Logares, Ramiro and Hansen, Gert},
  issn         = {0022-3646},
  keyword      = {Antarctica,cold-water dinoflagellates,dinoflagellate dynamics,polar,Polarella glacialis,saline lakes,Scrippsiella hangoei},
  language     = {eng},
  number       = {3},
  pages        = {592--604},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Phycology},
  title        = {Marine-derived dinoflagellates in Antarctic saline lakes: annual dynamics and community composition},
  url          = {http://dx.doi.org/10.1111/j.1529-8817.2008.00517.x},
  volume       = {44},
  year         = {2008},
}