Responses in bacterial community structure to waste nutrients from aquaculture: an in situ microcosm experiment in a Chilean fjord
| Autor: | Lasse Mork Olsen, Klaudia Hernández, K. Can Bizsel, José Iriarte, Yngvar Olsen, Murat Van Ardelan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine 030106 microbiology Fjord Aquaculture Management Monitoring Policy and Law Aquatic Science 01 natural sciences lcsh:Aquaculture. Fisheries. Angling 03 medical and health sciences Nutrient lcsh:QH540-549.5 Microbial community Patagonia Chile Water Science and Technology lcsh:SH1-691 geography geography.geographical_feature_category business.industry Ecology 010604 marine biology & hydrobiology Community structure Eutrophication Fishery Microbial population biology Bacterial diversity Environmental science lcsh:Ecology business Microcosm |
| Zdroj: | Aquaculture Environment Interactions, Vol 9, Pp 21-32 (2017) Aquaculture Environment Interactions Artículos CONICYT CONICYT Chile instacron:CONICYT |
| ISSN: | 1869-7534 |
| Popis: | Chilean salmon farms release inorganic nutrients excreted by the fish into the surrounding water in Patagonian fjords. The objective of this experiment from the Comau Fjord (42.2° S) in southern Chile was to study how increased input of ammonium (NH4) and phosphate (PO4) from salmon farms might affect the community structure of bacteria in surface waters where fish farms are located. We used microcosms (35 l) with NH4-N and PO4-P added to the natural seawater in a gradient of nutrient-loading rates, with the same N:P ratio as in salmon aquaculture effluents. Additionally, we measured bacterial community structure at different depths in the Comau Fjord to assess the natural variation to compare with our experiment. We used denaturing gradient gel electrophoresis (DGGE) to create 16S rDNA fingerprints of the bacterial communities and monitored biological and environmental variables (chlorophyll a, inorganic nutrients, pH, microbial abundance). The nutrient-loading rate had a significant impact on the bacterial community structure, and the community dissimilarity between low and high nutrient additions was up to 78%. Of the measured environmental variables, phytoplankton abundance and increased pH from photosynthesis had a significant effect. We observed no significant changes in bacterial diversity, which remained at the same level as in the unmanipulated community. Thus, the bacterial community of the fjord was not resistant, but resilient within the time frame and nutrient gradient of our experiment. © The authors 2017. Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are unrestricted. Authors and original publication must be credited. |
| Databáze: | OpenAIRE |
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