| Автор | Viner, A. B. |
| Автор | Kemp, L. |
| Дата выпуска | 1983 |
| dc.description | AbstractThe seasonal succession of the major phytoplankton species is described for Lake Rotongaio, a small crater lake which flows into Lake Taupo via a short channel. The dynamics of only the 4 most abundant species are described. Expressed as cell numbers, Anabaena oscillarioides dominated in the warmer and stratified periods from November 1979 to April 1980 and again from September 1980 to the end of the observation period in January 1981. During destratification the diatoms Synedra ulna and Cyclotella menenghiniana attained maximum numbers. The green alga Chlorella vulgaris peaked immediately before the September 1980 stratification. When expressed as cell volumes, however, the diatoms were always greater than Anabaena. It is proposed that these seasonal changes can largely be explained as being long‐term versions of short‐term population fluctuations seen during thermal stratification. These are interpreted to have been responses to vertical mixing with resulting changes in the availability of light for photosynthesis in the epilimnion. During thermal stratification, Anabaena is buoyed upwards, whereas the diatoms sink to the hypolimnion. To compensate for such losses the growth rates of the diatoms must have been of an approximately similar magnitude to the growth rates leading to their winter maxima. The Synedra population decline may have been influenced by low temperature in mid‐winter. Nutrient recirculation did not appear to be an important factor for phytoplankton bio‐mass. There is little evidence for any important direct competition between the species for resources; the phytoplankton dynamics and bio‐mass appear to be mediated directly by external events and not, in any important way, by internally generated conditions. |
| Формат | application.pdf |
| Издатель | Taylor & Francis Group |
| Копирайт | Copyright Taylor and Francis Group, LLC |
| Тема | phytoplankton |
| Тема | winds |
| Тема | mixing |
| Тема | stability |
| Тема | vertical distribution |
| Тема | !Anabaena oscillarioides |
| Тема | diatoms |
| Тема | nutrients |
| Тема | population dynamics |
| Тема | lakes |
| Тема | ecological zonation |
| Тема | seasonal variations |
| Тема | thermocline |
| Тема | Synedra ulna |
| Тема | Cyclotella menenghiniana |
| Тема | Chlorella vulgaris |
| Название | The effect of vertical mixing on the phytoplankton of Lake Rotongaio (July 1979 ‐January 1981) |
| Тип | research-article |
| DOI | 10.1080/00288330.1983.9516016 |
| Electronic ISSN | 1175-8805 |
| Print ISSN | 0028-8330 |
| Журнал | New Zealand Journal of Marine and Freshwater Research |
| Том | 17 |
| Первая страница | 407 |
| Последняя страница | 422 |
| Аффилиация | Viner, A. B.; Division of Marine and Freshwater Science, Department of Scientific and Industrial Research, Taupo Research Laboratory |
| Аффилиация | Kemp, L.; Division of Marine and Freshwater Science, Department of Scientific and Industrial Research, Taupo Research Laboratory |
| Выпуск | 4 |
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