Palaeobiodiversity of a floodplain lake sediments (N Poland) primary and secondary factors shaping sub-fossil assemblages

Аннотация

The Wrzenica 1 (W/1) site is located in the floodplain of the Wieprza River in northern Poland. Material is represented by the 890 cm-long peat and limnic sediments dated to the Younger Dryas and the main part of the Holocene (12 700 3 800 cal. yr BP). The multi-proxy study includes analyses of pollen with non-pollen palynomorphs (NPPs), Cladocera and plant and animal macroremains. The main purpose of the study is to reconstruct the ecological history of the wetland ecosystem and to identify factors shaping the sub-fossil assemblages of particular groups of plant and animal remains. All proxies have showed three main stages in the history of thepalaeoecosystem thelateglacial(YD) oligotrophic lake, the Holocene mesotrophic/eutrophic lake(11 750-5 600 cal. yr BP)and a mire(5 600-3 800 cal. yr BP). Several secondary shifts within theparticular assemblages have been also described.