Document Detail

Photosynthetic activity and community shifts of microphytobenthos covered by green macroalgae.
MedLine Citation:
PMID:  23760795     Owner:  NLM     Status:  In-Data-Review    
Macroalgae blooms, a frequent consequence of eutrophication in coastal areas, affect the photosynthetic activity of sediments dominated by microphytobenthos (MPB). Light spectra, steady-state (after 1 h) microprofiles of O2 , gross photosynthesis (Pg ), community respiration in light (RL ) and net community photosynthesis (Pn ) were measured in diatom- and cyanobacteria-dominated communities below increasing layers of Ulva. Photosynthetic photon flux (PPF) decreased exponentially with increasing layers of algae and the light spectrum was increasingly enriched in the green and deprived in blue and red regions. Sediment Pg , Pn and RL decreased as the number of Ulva layers increased; however, 1.6 times higher macroalgal density was necessary to fully inhibit cyanobacteria Pg compared with diatoms, indicating that cyanobacteria were better adapted to this light environment. Long-term (3 weeks) incubations of diatom-dominated sediments below increasing layers of Ulva resulted in a shift in the taxonomic composition of the MPB towards cyanobacteria. Hence, changes in the light climate below macroalgal accumulations can negatively affect the photosynthetic activity of sediments. However, spectral niche differentiation of MPB taxonomic groups and concurrent changes in the MPB community may provide sediments with increased resilience to the detrimental effects of eutrophication.
Emilio García-Robledo; Alfonso Corzo; Sokratis Papaspyrou; Edward P Morris
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Publication Detail:
Type:  Journal Article     Date:  2012-03-15
Journal Detail:
Title:  Environmental microbiology reports     Volume:  4     ISSN:  1758-2229     ISO Abbreviation:  Environ Microbiol Rep     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2013-06-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101499207     Medline TA:  Environ Microbiol Rep     Country:  United States    
Other Details:
Languages:  eng     Pagination:  316-25     Citation Subset:  -    
Copyright Information:
© 2012 Society for Applied Microbiology and Blackwell Publishing Ltd.
Dpto. Biología. Facultad de Ciencias del Mar y Ambientales, Pol. Río San Pedro s/n. 11510 Puerto Real, Cádiz, Spain Unidad asociada de Oceanografía Interdisciplinar. UCA - Instituto de Ciencias Marinas de Andalucia (ICMAN-CSIC), Pol. Rio San Pedro s/n, 11510 Puerto Real, Cádiz, Spain Department of Ecology and Coastal Management, Instituto de Ciencias Marinas de Andalucía (ICMAN-CSIC), Pol. Rio San Pedro s/n, Puerto Real, Cádiz, Spain.
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