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Carbon Sources of Sediment and Epifaunal Food Sources in a Tropical Mangrove Forest in North Sulawesi, indonesia

Journal of Ocean University of China 2020年第5期19卷 1169-1176页

作者： WU Zhiqiang XiE Limei CHEN Bin dhamawan i wayan eka SASTROSUWONDO Pramudji CHEN Shunyang RiANTA Pratiwi ERNAWATi Widyastuti CHEN Guangcheng College of Marine Life Sciences Ocean University of ChinaQingdao 266000China Third institute of Oceanography Ministry of Natural ResourcesXiamen 361005China Research Center for Oceanography Indonesian Institute of SciencesJakarta 11048Indonesia Observation and Research Station of Coastal Wetland Ecosystem in Beibu Bay Ministry of Natural ResourcesBeihai 536015China

The stable isotope ratios of nitrogen(δ^(15)N) and carbon(δ^(13)C) were applied in this study to analyze sediment carbon sources and primary food sources of epifauna in an oceanic mangrove forest in tropical North Sulawesi, indonesia. Proportional contribution of mangrove-derived carbon to the food sources was compared among epifauna belonging to different feeding guilds. The sediment in the mangrove site with a depleted δ^(13)C signature(-28.02‰± 0.24‰) mainly consists of mangrove-derived carbon. Analysis using Bayesian stable isotope mixing model in the R program shows that mangrove-derived carbon can dominate the food sources of a majority of the epifauna(11 out of the total 18 species), especially 2 sesarmid crabs Parasesarma semperi and Sesarma sp., crab Epixanthus dentatus, and snails Terebralia sulcata and Optediceros breviculum, which belong to various feeding guilds. Mangrove-derived carbon has a proportional contribution to the food sources of fiddle crab Tubuca coarctata and 3 littorinid snails(Littoraria spp.) close to that of suspended particulate organic matter. Three planktophagous bivalve species(Anadara antiquata, Anadara sp. and Callista erycina) were found to mainly feed on seagrass-derived materials. Mean proportional contributions of mangrove-derived carbon to the food sources were 50.15%, 59.60%, 46.20% and 27.58% for the carnivorous, omnivorous, phytophagous and planktophagous groups, respectively. The results suggest that mangrove-derived carbon can directly(via grazing plant tissues) or indirectly(via deposit feedings) make an important contribution to the food sources of epifauna in the oceanic mangrove forest where the allochthonous input of organic carbon is low.

关键词： epifauna stable isotope carbon nitrogen sediment feeding guilds

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Ecosystem carbon stock of a tropical mangrove forest in North Sulawesi, indonesia

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Acta Oceanologica Sinica 2018年第12期37卷 85-91页

作者： CHEN Shunyang CHEN Bin SASTROSUWONDO Pramudji DHARMAWAN i wayan eka OU Danyun YiN Xijie YU Weiwei CHEN Guangcheng Third institute of Oceanography Ministry of Natural Resources Research Center for Oceanography Indonesian Institute of Sciences Technical implementing Unit Marine Life Conservation Biak Indonesian Institute of Sciences

Recent studies have highlighted the valuable role played by mangrove forests in carbon sequestration and *** indonesia accounts for a large proportion of global mangrove area, knowledge on the carbon stock and sources in the indonesian mangrove is still limited. in this study, we quantified the ecosystem organic carbon(OC) stock and its spatial variation at an oceanic mangrove in Wori, North Sulawesi, indonesia. The sources of soil OC were also investigated. The results showed that the mangrove soil had a substantial OC stock containing15.4 kg/m2(calculated by carbon) in the top 50 cm soil, and represented the majority of the ecosystem OC stock at the Wori mangrove. The mangrove biomass and ecosystem OC stock were 8.3 kg/m2and 23.7 kg/m2, *** was no significantly difference in the soil OC stock among the stations with difference distances offshore,while the highest mangrove biomass OC stock was found at the seaward station. isotope mixing calculations showed that the rich OC in mangrove soils was attributed to the accumulated autochthonous mangrove source while the suspended organic matter in tidal water and the mangrove-adjacent seagrass contributed less than 20%to the soil OC. The results further demonstrated the importances of the oceanic mangrove in carbon storage and the mangrove plants in contributing OC to their soils.

关键词： mangrove carbon stock biomass soil stable isotopes indonesia

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