HERITABILITY OF MANTLE AREOLAR CHARACTERS IN AULACOSEIRA SUBARCTICA (BACILLARIOPHYTA)1
| Autor: | S. M. Edgar, Edward C. Theriot |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Journal of Phycology. 39:1057-1066 |
| ISSN: | 1529-8817 0022-3646 |
| DOI: | 10.1111/j.0022-3646.2003.02-141.x |
| Popis: | Are size and arrangement of valve mantle areolae in Aulacoseira Thwaites adapted to light intensity? To test one criterion demonstrating an adaptation, heritability experiments were run on isolates of Aulacoseira subarctica (Muller) Haworth. Several clones of A. subarctica were isolated from Yellow-stone Lake (Wyoming, USA), Lewis Lake (Wyoming), and East Rosebud Lake (Montana, USA). Two to four clones from each lake were grown in batch cultures under three irradiance levels: 2, 11.4, and 115 μmol photons . m - 2 . s - 1 . Five randomly chosen valves for each of two replicates of each clone were examined using a scanning electron microscope for a total of 300 valves. Size measurements were taken for each valve examined, and images of mantle areolae were captured on film at a magnification of 20,000 ×. Each image was digitized, and quantitative morphometric areolar characters were measured. A quantitative genetic analysis was performed within each light environment for the mean area of the external opening of mantle areolae, the mean distance between areolae within pervalvar striae, and the mean distance between pervalvar striae. Resulting estimates of heritability from among-lake and within-lake analyses indicate that all three mantle areolar characters could presently respond to selection and thus have potentially done so in the past. |
| Databáze: | OpenAIRE |
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