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http://dx.doi.org/10.11614/KSL.2012.45.4.444

Classification by Zooplankton Inhabit Character and Freshwater Microbial Food Web: Importance of Epiphytic Zooplankton as Energy Source for High-Level Predator  

Choi, Jong-Yun (Department of Biological Sciences, Pusan National University)
La, Geung-Hwan (Department of Environmental Education, Sunchon National University)
Jeong, Kwang-Seuk (Department of Biological Sciences, Pusan National University)
Kim, Seong-Ki (Department of Biological Sciences, Pusan National University)
Chang, Kwang-Hyeon (Department of Environmental Science and Engineering, Kyung-Hee University)
Joo, Gea-Jae (Department of Biological Sciences, Pusan National University)
Publication Information
Abstract
We conducted a comprehensive monitoring for freshwater food web in a wetland system (Jangcheok Lake), from May to October, 2011. Monthly sampling for zooplankton, fish as well as organic matters, was implemented. In order to understand the food web structure and energy flow, we applied stable isotope analysis to the collected samples, based on ${\delta}^{13}C$ and ${\delta}^{15}N$ values of epiphytic particulate organic matter(EPOM) and particulate organic matter (POM), epiphytic and planktonic zooplankton, fish (Lepomis macrochirus). In the study site, epiphytic and planktonic zooplankton was 24 and 30 species, respectively, and coincidence species between epiphytic and planktonic zooplankton were 20 species. Epiphytic zooplankton were more abundant during the spring and early summer (May to July); however, planktonic zooplankton were more abundant during the autumn (September to October) season. Stable isotope analysis revealed that fish and epiphytic zooplankton had seasonal variations on their food sources. EPOM largely contributed epiphytic zooplankton in spring (May), but increasing contribution of POM in autumn (September) was detected. However, planktonic zooplankton depended on only POM in both seasons. Fish utilized both epiphytic and planktonic zooplankton, but small sized (1~3 cm), fish preferred epiphytic zooplankton, where as larger sized (4~7 cm) fish tended to consume planktonic zooplankton, and epiphytic zooplankton had important role in energy transfer. This pattern was clear when results of spring and autumn stable isotope analysis were compared. From the results of this study, we confirmed that wetlands ecosystem supported various epiphytic and planktonic zooplankton species, they depend on other food items, respectively. L. macrochirus also showed a difference of food source according to the body size, they depend on seasonal density change of zooplankton. In particular, epiphytic zooplankton was very important for growth and development of young fish in the spring.
Keywords
inhabit character; epiphytic zooplankton; food web structure; stable isotope;
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