We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Differential inter- and intra-specific responses of Aphanizomenon strains to nutrient limitation and algal growth inhibition.
- Authors
de Figueiredo, Daniela R.; Gonçalves, Ana M. M.; Castro, Bruno B.; Gonçalves, Fernando; Pereira, Mário J.; Correia, António
- Abstract
Cyanobacterial blooms of Aphanizomenon spp. occur worldwide, with deleterious effects on aquatic communities. The present work aimed to investigate the effects of different levels of phosphorus and nitrogen on the growth of Aphanizomenon bloom-forming strains, belonging to the species A. issatschenkoi, A. aphanizomenoides and A. gracile. Algal inhibition tests were also performed to assess the potential allelopathic effects of the strains' filtrates on the growth of four green algae (Pseudokirchneriella subcapitata, Chlorella vulgaris, Pandorina morum and Coelastrum astroideum). Phosphorus had a significant effect on the growth of all the strains tested; orthophosphate concentrations ≤0.3 mg PO43− L−1 led to a decrease of more than 50% in the cyanobacterial growth of most strains. The growth of A. gracile strains was unaffected by variation in nitrate levels, but strains of A. issatschenkoi (UADFA1) and A. aphanizomenoides (UADFA6, UADFA7 and UADFA13) were moderately to extremely sensitive to nitrate depletion in the medium. These results strengthen the idea that intra-specific variation may play an important role in bloom dynamics; however, culture conditions and mutations may explain the morphological and physiological changes observed. Allelopathic assays revealed significant inhibition of microalgal growth by filtrates of strains from the three species, but also indicated intra-specific differences in allelopathic activity.
- Subjects
CYANOBACTERIAL blooms; APHANIZOMENON; ALGAL growth; AQUATIC organisms; LIMITING factors (Ecology); BIOLOGICAL variation; ALLELOPATHIC agents
- Publication
Journal of Plankton Research, 2011, Vol 33, Issue 10, p1606
- ISSN
0142-7873
- Publication type
Article
- DOI
10.1093/plankt/fbr058