Environmental influences on akinete germination and development in Nodularia spumigena (Cyanobacteriaceae), isolated from the Gippsland Lakes, Victoria, Australia

Myers, Jackie H., Beardall, John, Allinson, Graeme, Salzman, Scott and Gunthorpe, Leanne 2010, Environmental influences on akinete germination and development in Nodularia spumigena (Cyanobacteriaceae), isolated from the Gippsland Lakes, Victoria, Australia, Hydrobiologia, vol. 649, no. 1, pp. 239-247.

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Title Environmental influences on akinete germination and development in Nodularia spumigena (Cyanobacteriaceae), isolated from the Gippsland Lakes, Victoria, Australia
Formatted title Environmental influences on akinete germination and development in Nodularia spumigena (Cyanobacteriaceae), isolated from the Gippsland lakes, victoria, Australia
Author(s) Myers, Jackie H.
Beardall, John
Allinson, Graeme
Salzman, Scott
Gunthorpe, Leanne
Journal name Hydrobiologia
Volume number 649
Issue number 1
Start page 239
End page 247
Total pages 9
Publisher Springer Netherlands
Place of publication Dordrecht, Netherlands
Publication date 2010-04
ISSN 0018-8158
1573-5117
Keyword(s) Akinete germination
Algal blooms
Cyanobacteria
Irradiance
Nitrogen
Nodularia spumigena
Nutrients
Phosphorus
Salinity
Summary This study was carried out to investigate the genesis of N. spumigena blooms by specifically studying the effects of environmental variables (salinity, nitrogen, phosphorus and light) on the germination of N. spumigena akinetes. Optimal conditions for maximum germination and germling growth were determined by exposing akinetes to a range of salinities and nutrient (nitrogen and phosphorus) concentrations under two different irradiances. At pre-determined time periods, treatments were sampled and the percent germination and length of germlings assessed. The results indicated that akinete germination and germling growth were optimal at salinities from 5 to 25 and significantly reduced outside this range. A positive correlation in germination was observed with increasing nutrient (phosphorus and nitrate) concentration. Similarly, germling growth increased with increasing concentrations of both nutrients. Irradiance significantly influenced both germination and growth during salinity experiments, whereas in nutrient addition experiments, irradiance had no effect on germination; however, growth was significantly influenced during phosphorus addition experiments. Consequently, salinity and light appeared to be most critical in the germination process for N. spumigena akinetes, with phosphorus most important for germling growth. The study showed that N. spumigena may be able to germinate under environmental conditions outside its optimal range, but the growth of the germling is significantly reduced, which in turn suggests that its ability to form a bloom outside its optimal environmental conditions would also be greatly reduced.
Language eng
Field of Research 060703 Plant Developmental and Reproductive Biology
060203 Ecological Physiology
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, Springer Science+Business Media B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30028621

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