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W. Thimdee G. Deein N. Nakayama Y. Suzuki K. Matsunaga 《Wetlands Ecology and Management》2008,16(6):463-470
Stable carbon and nitrogen isotope ratios were used to elucidate primary carbon sources and trophic relationships of the fish
and shrimp community in the Klong Ngao mangrove ecosystem, southern Thailand. There were no significant differences in isotopic
compositions of biota between mangrove and offshore sites (Welch–Aspin test). The δ15N values of eight fish species and two shrimp species at both sites were also not significantly different by the test, meaning
that at both sites they feed on the same diets due to the discharge of large quantities of mangrove sediments. The δ15N isotopic enrichment of consumers suggested that there are four trophic levels in the Klong Ngao food web, with at least
two fish species capable of switching feeding strategies and thus altering their apparent trophic positions. Phytoplankton
culture experiments indicated that mangrove-derived sediments could play an important role in stimulating phytoplankton growth
for low turbidity offshore areas, thus providing an alternate food source. The isotopic associations among sources and consumers
indicated that mangroves were the major carbon source supporting aquatic food webs in the Klong Ngao ecosystem. 相似文献
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Thimdee W. Deein G. Sangrungruang C. Matsunaga K. 《Wetlands Ecology and Management》2004,12(2):135-144
Stable carbon (13C) and nitrogen (15N) isotopes were used to elucidate primary food sources and trophic relationships of organisms in Khung Krabaen Bay and adjacent offshore waters. The three separate sampling sites were mangroves, inner bay and offshore. The 13C values of mangrove leaves were –28.2 to –29.4, seagrass –10.5, macroalgae –14.9 to –18.2, plankton –20.0 to –21.8, benthic detritus –15.1 to –26.3, invertebrates –16.5 to –26.0, and fishes –13.4 to –26.3. The 15N values of mangrove leaves were 4.3 to 5.7, seagrass 4.3, macroalgae 2.2 to 4.4, plankton 5.7 to 6.4 , benthic detritus 5.1 to 5.3, invertebrates 7.2 to 12.2 , and fishes 6.3 to 15.9. The primary producers had distinct 13C values. The 13C values of animals collected from mangroves were more negative than those of animals collected far from shore. The primary carbon sources that support food webs clearly depended on location. The contribution of mangroves to food webs was confined only to mangroves, but a mixture of macroalgae and plankton was a major carbon source for organisms in the inner bay area. Offshore organisms clearly derived their carbon through the planktonic food web. The 15N values of consumers were enriched by 3–4 relative to their diets. The 15N data suggests that some of aquatic animals had capacity to change their feeding habits according to places and availability of foods and as a result, individuals of the same species could be assigned to different trophic levels at different places. 相似文献
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