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Corpus Systématique Végétale

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Reproductive performance of native and alien colonizing phanerogams on a glacier foreland, Iles Kerguelen

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  • Yves Frenot 1
  • Jean-Claude Gloaguen 2
  • 1) Université de Rennes I, URA 1853 CNRS, Station Biologique, F-35380, Paimpont, France
  • 2) Université de Rennes I, URA 1853 CNRS, Laboratoire d'Ecologie Végétale, Campus de Beaulieu, F-35042, Rennes Cedex, France

The retreat of the Ampère Glacier, on Kerguelen, has left wide ice-free areas where five native and two alien vascular plant species are involved in primary colonization. The number of seeds produced by individual fertile plants has been determined for each species and germination capacity has been tested under different temperature and light conditions. Colobanthus kerguelensis and Cerastium fontanum produced the highest number of seeds per plant. No dormancy mechanism occurred in either species and they appeared to be the most successful colonizers during the early stages following the deglaciation. No seeds of Azorella selago and Agrostis magellanica had germinated after 2 months. Dormancy was demonstrated only in Poa kerguelensis. Festuca contracta was the only species which exhibited a negative photo-sensitivity. Germination of indigenous seeds required relatively high temperatures, whereas the optimum temperature for germination in the introduced Poa annua was 10°C. These results are compared with the few data available in the subantarctic literature and ecological implications are discussed.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - marine biology & hydrobiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - psychologie. psychophysiologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - General Agricultural and Biological Sciences
Catégories WoS
  • 1 - science ; 2 - ecology
  • 1 - science ; 2 - biodiversity conservation
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Polar Biology

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