期刊
JOURNAL OF PLANKTON RESEARCH
卷 39, 期 3, 页码 392-403出版社
OXFORD UNIV PRESS
DOI: 10.1093/plankt/fbx010
关键词
germination; sediment; Dolichospermum; Aphanizomenon; Cylindrospermopsis raciborskii
资金
- Joint German-Israeli BMBF (Federal Ministry of Education and Research) research project [FKZ 02WT0985]
- Early Career Fellowship of the Graduate Research School at the Brandenburg University of Technology Cottbus - Senftenberg
- Brandenburg University of Technology Cottbus - Senftenberg
- BMBF [FKZ 0330792B]
Akinetes (resting stages), as key elements in the life cycle of Nostocales, ensure the persistence of species and invasion of new habitats. Information about the sedimentary akinete pool is required to predict blooms of Nostocales. We studied the akinete abundance in the surface sediment of a deep stratified lake in NE Germany to determine which part of the akinete pool is potentially able to germinate under the underwater light, temperature and oxygen conditions present. Akinetes increased in abundance significantly with depth (R-2 = 0.86). They accumulated below 12 m (214 x 10(6) akinetes m(-2)), where temperatures of 8-12A degrees C could support germination, but light supply a <= 0.1 mol photons m(-2) d(-1) and anoxia in the summer prevent germination. Assuming a light supply of 0.5 mol photons m(-2)d(-1) and oxic conditions suitable for germination, only 10% of the total akinete pool deposited in littoral areas of 0-8 m depth can contribute to the recruitment. The sediment area for germination due to oligotrophication would increase from the current 41 to 45-61%. Thus, up to 261 x 10(12) more dormant akinetes could become part of the active akinete pool and consequently influence the future species composition and support the persistence of species.
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