Impacts of sea cucumber farming on biogeochemical characteristics in the Yellow River estuary, Northern China

Publication date: Available online 28 December 2016 Source:Physics and Chemistry of the Earth, Parts A/B/C Author(s): Jing Fu, Hisashi Yokoyama, Baoshan Cui, Jin Zhou, Jiaguo Yan, Xu Ma, Shozo Shibata To investigate the potential environmental effects of pond farming for Apostichopus japonicas in Yellow River estuary, we examined discrepancies of distance-based typical pollution indicators (TOC, TN, NO3 -, NH4 +, NO2 - and PO4 3-) and biochemical tracers (δ13C and δ15N) in water column and sediment, as well as dietary characteristics of dominant macrobenthos between farming and non-farming areas. The results revealed that studied variables in water column showed no uniform spatial differences. Meanwhile, those in sediments displayed similar decrease tendencies from farming pond to the adjacent tidal flat, which was considered to represent the environmental effects of farming. Biochemical tracers (δ13C and δ15N) in both water column and sediment confirmed the origin of organic matters from the aquaculture waste. The detectable dispersion distance of aquaculture waste was restricted to an area within 50 m distance as determined by most variables in sediment (TOC, TN, NO3 - and NH4 +), particularly by C/N ratio and δ13C with which origins of the wastes were traced. Bayesian mixing models indicated that in the farming area BMA had a larger contribution, while POM(marine) showed a smaller contribution to the diets of Helice tridens and Macrophthalmus abbreviates comp...
Source: Physics and Chemistry of the Earth, Parts ABC - Category: Science Source Type: research