Variation in carbon and nitrogen stable isotopes in POM and zooplankton in a deep reservoir and relationship to hydrological characteristics

Lee, J.-Yong; Kim, J.-Ku; Owen, J.S.; Choi, Y.; Shin, K.; Jung, S.; Kim, B.

Journal of Freshwater Ecology 28(1): 47-62


ISSN/ISBN: 0270-5060
DOI: 10.1080/02705060.2012.689999
Accession: 036500512

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We investigated the carbon and nitrogen stable isotope composition of particulate organic matter (POM) and zooplankton to understand the effects of highly variable hydrologic inputs with the onset of the summer monsoon season in Lake Soyang, Korea. The main characteristic separating pre-monsoon and post-monsoon seasons in Lake Soyang is the dramatic difference in hydrologic inflow. Pre-monsoon ?13C-POM (range ?32.4 to ?21.8 ) was lower than post-monsoon ?13C-POM (range ?25.5 to ?19.9 ). Epilimnetic ?13C-POM was higher post-monsoon compared to pre-monsoon, except in 27. In the metalimnion, pre-monsoon ?13C-POM varied among years, while the variation in ?13C-POM post-monsoon was small and was related to the inflow of organic matter during summer monsoon storms. ?13C-zooplankton was lower post-monsoon (range ?31.9 to ?24.4 ) compared to pre-monsoon (range ?19.4 to ?17.7 ), while ?15N-zooplankton showed the opposite pattern (pre- and post-monsoon average 6.6? ?2. and 4.3? ?1.5 , respectively). In Lake So.