Document Detail


Assessing the micro-phytoplankton response to nitrate in Comau Fjord (42°S) in Patagonia (Chile), using a microcosms approach.
MedLine Citation:
PMID:  23054289     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Anthropogenic (aquaculture) changes in environment nutrient concentrations may affect phytoplankton (biomass and taxa composition) in marine coastal waters off the Chilean Patagonia. The effects of adding nitrate (NO(3) (-)) to natural phytoplankton assemblages were evaluated considering biomass, cell abundance, and taxonomic composition. Microcosm experiments were performed in the spring, summer, and winter in the Comau Fjord located in Subantarctic Patagonia. At the end of the experiments, NO(3) (-) decreased rapidly and was undetectable in treatments, indicating a strong NO(3) (-) deficiency associated with an exponential increase in Chl-a concentrations, particulate organic nitrogen, and carbon in these treatments. Moreover, given the depleted nitrate concentrations of the spring and summer experiments, the micro-phytoplankton taxa structure shifted from mixed diatom and dinoflagellate assemblages (Ceratium spp., Dinophysis spp., Coscinodiscus sp., Rhizosolenia pungens) to assemblages dominated by blooms of the classic chain-forming diatoms found in temperate and cold waters such as Chaetoceros spp., Skeletonema spp., and Thalassiosira spp. Thus, nitrogen sources (i.e., nitrate, ammonia) may influence phytoplankton abundance and biomass accumulation dynamics in the northern section of Patagonia. It also emphasizes the importance of diatom taxa in regards to the short-term response of phytoplankton to changing environmental nutrient conditions due to natural (decreasing freshwater stream flow) and anthropogenic (aquaculture) events. This situation may be one of the future scenarios in the Patagonian fjords, thus stressing the needs for active environmental monitoring and impact assessment.
Authors:
José Luis Iriarte; Silvio Pantoja; Humberto E González; Gabriela Silva; Hector Paves; Pamela Labbé; Lorena Rebolledo; Murat Van Ardelan; V Häussermann
Related Documents :
21739179 - Occurrence of perfluorinated organic acids in the north and baltic seas. part 2: distri...
23720429 - Scales and drivers of local adaptation in brassica nigra (brassicaceae) populations.
21616519 - Spatial distribution of organochlorine contaminants in soil, sediment, and fish in biki...
24736659 - Decomposition of organic carbon in fine soil particles is likely more sensitive to warm...
18695989 - Challenges for effective marker-assisted selection in plants.
10905609 - Vegetative and reproductive innovations of early land plants: implications for a unifie...
14757039 - On risk and plant-based biopharmaceuticals.
20358689 - Household chemicals: management of intoxication and antidotes.
21628299 - Breeding system and pollination ecology of introduced plants compared to their native r...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-11
Journal Detail:
Title:  Environmental monitoring and assessment     Volume:  -     ISSN:  1573-2959     ISO Abbreviation:  Environ Monit Assess     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8508350     Medline TA:  Environ Monit Assess     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Instituto de Acuicultura and Centro de Investigación en Ecosistemas de la Patagonia-CIEP, Universidad Austral de Chile, Puerto Montt, Chile, jiriarte@uach.cl.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Real-time monitoring of water quality using fish and crayfish as bio-indicators: a review.
Next Document:  Shoreline change analysis of Vedaranyam coast, Tamil Nadu, India.