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http://dx.doi.org/10.11626/KJEB.2014.32.1.035

The Influences of Additional Nutrients on Phytoplankton Growth and Horizontal Phytoplankton Community Distribution during the Autumn Season in Gwangyang Bay, Korea  

Bae, Si Woo (Korea Institute of Ocean Science and Technology/South Sea Institute)
Kim, Dongseon (Ocean Circulation and Climate Research, KIOST)
Kim, Young Ok (Korea Institute of Ocean Science and Technology/South Sea Institute)
Moon, Chang Ho (Department of Oceanography, Pukyong National University)
Baek, Seung Ho (Korea Institute of Ocean Science and Technology/South Sea Institute)
Publication Information
Korean Journal of Environmental Biology / v.32, no.1, 2014 , pp. 35-48 More about this Journal
Abstract
In order to estimate the effect of additional nutrients on phytoplankton growth and horizontal phytoplankton community distribution during the autumn season in 2010 and 2011, we investigated the abiotic and biotic factors of surface and bottom waters at 20 stations of inner and offshore areas in Gwangyang Bay, Korea. Also, nutrient additional experiments were conducted to assess additional nutrient effects on phytoplankton assemblage using the surface water. In both years, the total nutrients were high at the enclosed inner bay and the mouth of Seomjin River, whereas it was low at the St.15~20 where in influenced by the surface warm water current from offshore of the bay. On the other hand, nano- and pico-sized Chl. a were gradually increased towards the outer bay and their trends were significant in 2011 than in 2010. The cryptophyta species occupied more than 85% of total phytoplankton assembleges in 2010, whereas their abundance in 2011 remainds to be 1/10 levels of 2010. Following the cryptophata species, the diatom Chaetoceros spp. and Skeletonema-like spp. were found to be dominant species. Further the biosaasy experimental results shows that the phytoplankton biomass in the +N and +NP treatments was higher compared to control and +P treatments and its trend was significant at St.8 and St.20 where nutrient concentration were low. Based on the bioassay and field survey, providing the high nutrients may have stimulated to phytoplankton growth such as S. costatum-like spp.. In particular, opportunistic micro-algae such as Cryptomonas spp. were able to achieve the high biomass under the relatively mid nutrient condition from bottom after break down of seasonal stratification in the Gwangyang Bay.
Keywords
Cryptomonas spp.; size fraction; phytoplankton community; nutrient addition experiments; Gwangyang Bay;
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Times Cited By KSCI : 14  (Citation Analysis)
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