Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 441263
Title Genotype-by-temperature interactions may help to maintain clonal diversity in asterionella formosa (Bacillariophyceae)
Author(s) Gsell, A.S.; Domis, L.N.D.; Przytulska-Bartosiewicz, A.; Mooij, W.M.; Donk, E. van; Ibelings, B.W.
Source Journal of Phycology 48 (2012)5. - ISSN 0022-3646 - p. 1197 - 1208.
DOI https://doi.org/10.1111/j.1529-8817.2012.01205.x
Department(s) Aquatic Ecology and Water Quality Management
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) diatom ditylum-brightwellii - fresh-water phytoplankton - reaction norms - phenotypic plasticity - genetic-variation - centric diatom - cell-size - environment interactions - marine-phytoplankton - skeletonema-costatum
Abstract Marine and freshwater phytoplankton populations often show large clonal diversity, which is in disagreement with clonal selection of the most vigorous genotype(s). Temporal fluctuation in selection pressures in variable environments is a leading explanation for maintenance of such genetic diversity. To test the influence of temperature as a selection force in continually (seasonally) changing aquatic systems we carried out reaction norms experiments on co-occurring clonal genotypes of a ubiquitous diatom species, Asterionella formosa Hassall, across an environmentally relevant range of temperatures. We report within population genetic diversity and extensive diversity in genotype-specific reaction norms in growth rates and cell size traits. Our results showed genotype by environment interactions, indicating that no genotype could outgrow all others across all temperature environments. Subsequently, we constructed a model to simulate the relative proportion of each genotype in a hypothetical population based on genotype and temperature-specific population growth rates. This model was run with different seasonal temperature patterns. Our modeling exercise showed a succession of two to several genotypes becoming numerically dominant depending on the underlying temperature pattern. The results suggest that (temperature) context dependent fitness may contribute to the maintenance of genetic diversity in isolated populations of clonally reproducing microorganisms in temporally variable environments.
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