Ning Wang
(State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China)
Hadal trenches (6000-11000 m) constitute 45% of the ocean depths range and have the ecology of the deepest places on earth. The understanding of the life history of hadal trench organisms is limited due to the lack of a proper dating method. Though radiocarbon has the potential for dating modern organisms in trenches, the lack of a 14C dating method limited the application of 14C in marine organisms. Here we will show the 14C dating method for modern hadal organisms by the example of amphipods. First, the radiocarbon tracing study reveals that the organic carbon of hadal amphipods mainly comes from the production in the surface water. Then a synthetic curve for the 14C variation in the West Pacific Ocean (WPO) for the past 70 years was built up by the data of proxy of 14C content in surface water. The apparent ages of amphipods' muscle tissues are calibrated according to the WPO curve. These results indicate greater longevity of hadal amphipods than the ones in shallow water, which is consistent with the ages estimated by the body length and growth rate. The relation between the apparent age and real age of amphipods needs further interdisciplinary studies. This method can be applied extensively to marine organisms in the deep sea, whose organic carbon source also comes from the production in surface water.
Ning Wang
(State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China)
Ping Ding
(State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China)
Sanyuan Zhu
(State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China)
Chengde Shen
(State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China)
Jiasong Fang
(Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai, China，Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China，Department of Natural Sciences, Hawaii Pacific University, Honolulu, HI, USA)
Lisheng He
(Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China.)
Weidong Sun
(Center of Deep Sea Research, Center of Ocean Mega Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China， Deep-Sea Multidisciplinary Research Center, Laoshan Laboratory, Qingdao 266237, China，College of Marine Sciences, University of Chinese Academy of Sciences, Beijing 100049, China)
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