| Two parthenogenetic populations of Chara canescens differ in their capacity to acclimate to irradiance and salinity. | |
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MedLine Citation:
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PMID: 21894516 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The parthenogens of Chara canescens (Charophyceae) occupy broader geographical and ecological ranges than their sexual counterparts. Two possible hypotheses explain the ubiquity of parthenogens: the occurrence of one or several parthenogens with wide niches, or of many parthenogens that are restricted to narrow ecological niches. For the purposes of this study, C. canescens individuals from two neighbouring populations of the Baltic Sea (Bodstedter Bodden = BB; Salzhaff = SH), which differed significantly in water transparency and salinity, were investigated for significant differences in physiological capacity. Individuals of both habitats acclimated quickly to daily changes in irradiances in the field, but the photosynthetic efficiency of PS II showed a significant decrease with increasing daily irradiance in the habitat BB, which has lower levels of salinity and water transparency. In addition to the field study, individuals were reared under different levels of environmental factors in the laboratory: four irradiances (70-600 μmol m(-2) s(-1)) and five salinity levels (0-24 psu). The individuals of both habitats grew almost equally well at intermediate salinity levels. Growth under the artificial light supply was highest at levels corresponding to the in situ conditions for each population. Total chlorophyll was highest at intermediate salinities (BB), or hardly changed with salinity (SH). The physiological capacity for individuals from SH clearly depends upon changing growth irradiance, whereas the capacity for individuals from BB was relatively independent of salinity and irradiance. These findings indicate that both parthenogenetic C. canescens populations are locally adapted to light. However, to test adaptive potential of the parthenogens, more than two populations should be tested in future. |
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Authors:
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Ralf Schaible; Antje Gerloff-Elias; Fernando Colchero; Hendrik Schubert |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-9-6 |
Journal Detail:
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Title: Oecologia Volume: - ISSN: 1432-1939 ISO Abbreviation: - Publication Date: 2011 Sep |
Date Detail:
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Created Date: 2011-9-6 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0150372 Medline TA: Oecologia Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Institute of Bio Sciences, Aquatic Ecology, University of Rostock, Albert-Einstein Str. 3, 18051, Rostock, Germany, ralf.schaible@uni-rostock.de. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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