The Potential of Mangrove-Derived Organic Matter in Sediments for Tracing Mangrove Development During the Holocene
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The Potential of Mangrove-Derived Organic Matter in Sediments for Tracing Mangrove Development During the Holocene Peng Xia 1,2 & Xianwei Meng 1,3 & Yao Zhang 1 & Jun Zhang 1 & Zhen Li 4 & Wanzhu Wang 1 Received: 9 January 2020 / Revised: 21 August 2020 / Accepted: 28 August 2020 # Crown 2020
Abstract The responses of mangroves to future climate change can be reconstructed from past mangrove dynamics using proxies preserved in sediments. The contributions of mangrove-derived organic matter (MOM) can be calculated by using δ13Corg and molar C:N values. In order to verify the effectiveness of MOM for tracing mangrove development, four typical regions are chosen, including the Beibu Gulf of SW China, western coast of peninsular India, Flamenco Lagoon of Puerto Rico, and Amazon estuary of northern Brazil. The results showed that the temporal variation of calculated MOM is similar to the abundance of mangrove pollen (MP) in each core. There are significant positive correlations between them, with correlation coefficients ranging from 0.68 to 0.89 (P < 0.01). However, there is no correlation (R = 0.02, P > 0.05, n = 281) between MOM and MP globally, owing to the complexities of OM provenance and pollen transmission. It is indicated that MOM is a potential proxy for regional mangrove development during the Holocene. The proxy should be useful to reconstruct high-resolution mangrove development, owing to its easily fine-cut sampling and cheaper cost of instrumentation compared with pollen and biomarkers. Keywords Mangrove development . Organic matter . Mangrove pollen . Orangic carbon isotope . Holocene
Introduction Mangroves are one of the most fragile, biologically complex, and diverse coastal ecosystems on earth, and they are vulnerable to global climate change and sea-level rise (Ellison and Stoddart, 1991; Ellison, 1993; Parkinson et al., 1994; Yulianto et al., 2004). The response of mangroves to future climate Communicated by Zhanfei Liu * Xianwei Meng [email protected] Peng Xia [email protected] 1
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3
Laboratory for Maine Geology and Environment, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
4
School of Earth and Ocean Science, University of Victoria, Victoria, BC V8W 2Y2, Canada
change can be understood by reconstructing past mangrove dynamics in terms of different time scales (Gillman et al., 2007). Annual mangrove development can be directly constructed by observational records through in situ measurement and/or satellite imagery over the last decades. Centennial- to millennial-scale mangrove development can be reconstructed by some proxies buried in sediments (Ellison, 2008). The abundance of mangrove pollen (MP) has proven to be the most straightforward and effective proxy (Li et al., 2008) and is widely used to trace historical records of mangrove development during the
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