Abstract
Abstract Stable carbon isotope ratios (δ13C) and C/N atomic ratio {(C/N)a} were used to investigate the sources and fate of organic matter in Khung Krabaen Bay, Thailand (KKB) and to assess the effect of shrimp pond effluent on the KKB system. Five major sources (mangroves, seagrass, algae, plankton, and shrimp feeds) contributing organic matter into waters and sediments were identified. Statistically significant differences between the δ13C values and (C/N)a of mangrove leaves (δ13C ∼ −29‰ (C/N)a ∼ 40–105), seagrass (δ13C ∼ −11‰ (C/N)a ∼ 19), and algae (δ13C ∼ −16‰ (C/N)a ∼ 18) were found, while plankton (δ13C ∼ −21‰ (C/N)a ∼ 5–6) and shrimp feeds (δ13C ∼ −23‰ (C/N)a ∼ 7) had similar values. The most negative δ13C values of particulate organic matter (POM) and sediments in the mangrove area indicated that mangroves were the major sources of organic matter in this area. The δ13C levels in POM and in sediments found in the canals indicated that the organic matter was predominantly of mangrove origin rather...
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