[{"name":"andren-2020-diatoms-1","title":"Siliceous microfossil data (diatoms) from the western Gotland Basin, Baltic Sea, covering the last 1200 years","summary":"This dataset consists of siliceous microfossil counts (mainly diatoms) and concentration (absolute abundance), from a 233 cm long splice sediment record (core MSM62-1-60) from the western Gotland Basin, Baltic Sea, at a water depth of 203 to 218 m. The sediment was collected in March 2017 and covers approximately 1200 years (2017\u2060\u200a\u2013\u200a\u2060756 CE).\r\n\r\nSiliceous microfossil data are used to provide information on e.g. changes in primary production, stratification, bloom seasonality and surface water salinity conditions.\r\n\r\nThis dataset was used to compare the environmental conditions reconstructed during Medieval times with settings occurring the last century under influence of environmental stressors like eutrophication and climate change.","citations":"Andr\u00e9n E, van Wirdum F, Norb\u00e4ck Ivarsson L, L\u00f6nn M, Moros M, Andr\u00e9n T (2020). Medieval versus recent environmental conditions in the Baltic Proper, what was different a thousand years ago? Palaeogeography, Palaeoclimatology, Palaeoecology 555, 109878. doi:10.1016\/j.palaeo.2020.109878\r\n","comments":"###### Position of corers\r\n- long gravity corer: 57\u00b0 58.64\u2019 N, 17\u00b0 57.37\u2019 E, water depth 218.6 m\r\n- short multicorer: 57\u00b0 58.73\u2019 N, 17\u00b0 57.56\u2019 E, water depth 203 m\r\n\r\nElinor Andr\u00e9n developed the microfossil data. Thomas Andr\u00e9n developed the age model.\r\n\r\nFor information on age modelling see article by Andr\u00e9n et al. (2020).\r\n\r\nThe sediment samples were prepared for siliceous microfossil analyses according to the method described in Battarbee (1986) and Battarbee and Kneen (1982). All concentrations are given in number per gram dry weight (No.\/gdw). The floras used for diatom identification and classification into salinity requirements and life form (pelagic versus benthic) are Cleve-Euler (1951\u2060\u200a\u2013\u200a\u20601955), Hasle and Syvertsen (1997), Krammer and Lange-Bertalot (1986\u2060\u200a\u2013\u200a\u20601991), Snoeijs et al. (1993\u2060\u200a\u2013\u200a\u20601998) and Witkowski et al. (2000), and taxonomic names are updated according to [AlgaeBase](https:\/\/www.algaebase.org\/). All references and details of methods can be found in Andr\u00e9n et al. (2020).","category":"Marine","subcategory":"Ecosystems","keywords":"Diatom stratigraphy; Siliceous microfossil; Pseudosolenia calcar-avis; Eutrophication; Phytoplankton seasonality; Surface water salinity; Baltic Sea; Western Gotland Basin","scientist":"Elinor Andr\u00e9n, Thomas Andr\u00e9n","firstname":"Elinor","lastname":"Andr\u00e9n","address":"School of Natural Sciences, Technology and Environmental Studies; S\u00f6dert\u00f6rn University","postalcode":"SE-141 89","city":" Huddinge","province":"","country":"Sweden","parameters":"Earth science > Biological classification > Protists > Diatoms","location":"Ocean > Atlantic Ocean > North Atlantic Ocean > Baltic Sea","progress":"Completed","language":"English","project":"Founding from the Foundation of Baltic and East European studies (grant 1562\/3.1.1\/2013 and grant 2207\/3.1.1\/2014)","publisher":"Bolin Centre Database","version":"1","constrains":"","access":"Free"}]