caa a22 4500 445892110 CHVBK 20180317145619.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10750-011-0714-4 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0714-4 Potential triggers of akinete differentiation in Nodularia spumigena (Cyanobacteriaceae) isolated from Australia [Elektronische Daten] [Jackie Myers, John Beardall, Graeme Allinson, Scott Salzman, Simon Robertson, Leanne Gunthorpe] Nodularia spumigena, like many cyanobacteria, produces specialised reproductive structures, known as akinetes, which are believed to allow survival under unfavourable conditions. This study investigated the effects of salinity, nitrogen and phosphorus concentration at two irradiances on akinete differentiation in a N. spumigena isolate from the Gippsland Lakes, Victoria, Australia. A computer image analysis program was used to photograph filaments and assess production of akinetes over time in separate experiments for each environmental parameter. Heterocyst production and cell morphology were also examined. The results suggest that akinete production increases over time. Production of akinetes is further increased at low and high salinities and with the addition of nitrate. Higher irradiance increases akinete differentiation, although in combination with different phosphorus concentrations causes varied effects. The development and sedimentation of akinetes may provide an inoculum for reoccurring blooms. Heterocysts were only observed during experiments with varying salinity and nitrogen exposures. Light quantity appeared to play a large role in heterocyst production. The ability of N. spumigena to produce akinetes and heterocysts is likely to be part of the reason for its success and continual occurrence in estuarine environments low in nitrogen, such as the Gippsland Lakes, Victoria, Australia. Factors known to reduce heterocyst and akinete production will provide new insight to possible management controls for this species. Springer Science+Business Media B.V., 2011 Nodularia spumigena nationallicence Akinete differentiation nationallicence Nutrients nationallicence Salinity nationallicence Irradiance nationallicence Algal blooms nationallicence Myers Jackie School of Biological Sciences, Monash University (Clayton Campus), 3800, Clayton, VIC, Australia aut Beardall John School of Biological Sciences, Monash University (Clayton Campus), 3800, Clayton, VIC, Australia aut Allinson Graeme Centre Aquatic Pollution Identification Management (CAPIM), Bio21 Institute, The University of Melbourne, 30 Flemington Road, 3025, Parkville, VIC, Australia aut Salzman Scott School of Information Systems, Deakin University (Warrnambool Campus), 423, 3280, Warrnambool, VIC, Australia aut Robertson Simon Fish Ageing Services Pty Ltd, 396, 3223, Portarlington, VIC, Australia aut Gunthorpe Leanne Department of Primary Industries, Fisheries Victoria, DPI Queenscliff Centre, 114, 3225, Queenscliff, VIC, Australia aut Hydrobiologia Springer Netherlands 671/1(2011-08-01), 165-180 0018-8158 671:1<165 2011 671 10750 https://doi.org/10.1007/s10750-011-0714-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0714-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Myers Jackie School of Biological Sciences, Monash University (Clayton Campus), 3800, Clayton, VIC, Australia aut NATIONALLICENCE 700 1- Beardall John School of Biological Sciences, Monash University (Clayton Campus), 3800, Clayton, VIC, Australia aut NATIONALLICENCE 700 1- Allinson Graeme Centre Aquatic Pollution Identification Management (CAPIM), Bio21 Institute, The University of Melbourne, 30 Flemington Road, 3025, Parkville, VIC, Australia aut NATIONALLICENCE 700 1- Salzman Scott School of Information Systems, Deakin University (Warrnambool Campus), 423, 3280, Warrnambool, VIC, Australia aut NATIONALLICENCE 700 1- Robertson Simon Fish Ageing Services Pty Ltd, 396, 3223, Portarlington, VIC, Australia aut NATIONALLICENCE 700 1- Gunthorpe Leanne Department of Primary Industries, Fisheries Victoria, DPI Queenscliff Centre, 114, 3225, Queenscliff, VIC, Australia aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 671/1(2011-08-01), 165-180 0018-8158 671:1<165 2011 671 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer