Paleontological Records of Holocene Environmental Changes offshore, Egypt

作     者：Rehab ELSHANAWANY Yousra MOHAMED Mohamed IAIBRAHIM 

作者机构：MARUMLeobener StraβeUniversity of BremenD-28359 BremenGermany Faculty of ScienceAlexandria UniversityMoharam Bey 21511Egypt 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2019年第18卷第6期

页      面：1382-1394页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：the professor in National Institute of Oceanography and Fisheries NIOF for providing the core samples of METEOR cruise M70b (October 2006) 

主　　题：dinoflagellate cysts paleoenvironmental changes planktic and benthic foraminifera offshore Egypt 

摘      要：Paleontological and sedimentological analyses were carried out in sediment core from southeastern Mediterranean Sea,offshore Egypt to reconstruct the past environmental changes in trophic state and temperature during *** achieve our goals,grain size,total organic carbon,planktic and benthic foraminifera,dinoflagellate cysts have been *** micropalaentological studies have been done in the studied area and none of them used the combined proxies of benthic foraminifera and dinoflagellate *** combined proxies reflects more comprehensive paleoenvironmental *** and abiotic data have been analysed with multivariate technique including Redundancy Analysis(RDA).Diversity indices such as:Fisher alpha index(α)and Shannon index(H)have been *** foraminiferal study yields 9 planktic species and 10 benthic *** assemblages have low species diversity indices especially at sapropel layer *** sapropels are layers with elevated organic carbon concentrations that contrast with surrounding organic poor *** occur periodically in sedimentary sequences of the last millions years,which have been the subject of extensive previous *** Analysis(RDA)yields two groups of foraminiferal assemblages depending on the changes of total organic carbon and clay *** dinocysts study yields 15 species,the majority of cyst types belonging to the order *** association of dinoflagellate cyst shows two depositional phases in the *** sapropel layer S1,with anoxic condition and warmer temperature,is recorded at depth 28-46 cm where heterotrophic taxa dominate and the post-sapropel layer is recorded at depth 0-28 cm;where autotrophic taxa dominate.