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|Title:||Differential inter-and intra-specific responses of Aphanizomenon strains to nutrient limitation and algal growth inhibition|
|Author:||De Figueiredo, Daniela R.|
Gonçalves, Ana M. M.
Castro, Bruno B.
Pereira, Mário J.
Inter- and intra-speciﬁc variation
|Publisher:||Oxford University Press|
|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 PO4 32 L21 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.|
|Appears in Collections:||CESAM - Artigos|
DBio - Artigos
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