Genetic variability and differentiation in the temperature niche component of the diatom Thalassiosira pseudonana |
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| Authors: | L E Brand L S Murphy R R L Guillard H -t Lee |
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| Institution: | (1) Biology Department, Woods Hole Oceanographic Institution, 02543 Woods Hole, Massachusetts, USA;(2) Bigelow Laboratory for Ocean Sciences, 04575 West Boothbay Harbor, Maine, USA |
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| Abstract: | The acclimated reproduction rates of 14 clones of the diatom Thalassiosira pseudonana were measured at 12°, 16°, 20°, and 24°C. Reproduction rate increased monotonically with an increase in temperature in all 14 clones. Significant genetic variability in reproduction rates and electrophoretic mobility of isozymes were observed among clones within a population from a single water bottle collected in a warm core eddy overlying slope water. The major genetic differentiation was between neritic and oceanic populations, with neritic clones having higher reproduction rates at all 4 temperatures. Surprisingly small genetic differences were observed among clones from neritic waters around the world. The slopes of the temperature-reproduction rate plots of all 14 clones were quite similar.Woods Hole Oceanographic Institution Contribution No. 4679 |
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