Diatom valve counts of the MIS-5a sediment sequence from Sokli (Finland) in 2010
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2025
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| author | Helmens, Karin Engels, Stefan Katrantsiotis, Christos Kuosmanen, Niina Luoto, Tomi P Salonen, J Sakari Väliranta, Minna |
| author_facet | Helmens, Karin Engels, Stefan Katrantsiotis, Christos Kuosmanen, Niina Luoto, Tomi P Salonen, J Sakari Väliranta, Minna |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | This dataset provides counts of diatom valves for the MIS-5a sediment sequence retrieved from Sokli (Finland) in 2010. Counts per taxon are presented against depth (m); total sums for classes of diatoms (e.g. Sum Benthic Taxa) are presented as well. The diatom dataset provides information on MIS 5a lake ecosystem dynamics (Helmens et al., 2021). A total of 22 samples were selected for diatom analysis. Diatoms were extracted from the sediment following the protocol presented by Battarbee et al. (2003). First, organic matter was oxidized in H2O2 in a water bath (at c. 100 °C). Subsequently, carbonates were removed by 10% HCl treatment (no visible reaction). Clay particles were decanted from 100 ml beakers after sedimentation overnight. Sand grains were removed after five seconds of sedimentation. The residue was mounted in Naphrax® and analysed under a light microscope with X1000 magnification using immersion oil. Flora used for species identification and information on ecological preferences are presented in Helmens et al. (2009). A minimum of 500 diatom valves were identified from each of the samples (average count = 1322, range = 531-2264 valves). All analyses were performed in the laboratories Stockholm University, Sweden. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_983896 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Diatom valve counts of the MIS-5a sediment sequence from Sokli (Finland) in 2010 Helmens, Karin Engels, Stefan Katrantsiotis, Christos Kuosmanen, Niina Luoto, Tomi P Salonen, J Sakari Väliranta, Minna Achnanthes bioretii; Achnanthes clevei; Achnanthes conspicua; Achnanthes distincta; Achnanthes exigua; Achnanthes flexella; Achnanthes helvetica; Achnanthes holstii; Achnanthes joursacense; Achnanthes lanceolata; Achnanthes minutissima; Achnanthes oestrupii; Achnanthes spp.; Amphora fogediana; Amphora libyca; Amphora ovalis; Amphora pediculus; Amphora spp.; Anomoeoneis brachysira; Anomoeoneis sphaerophora; Aulacoseira alpigena; Aulacoseira ambigua; Aulacoseira crenulata; Aulacoseira distans; Aulacoseira granulata; Aulacoseira granulata var. angustissima; Aulacoseira islandica; Aulacoseira italica; Aulacoseira lacustris; Aulacoseira lirata; Aulacoseira muzzanensis; Aulacoseira spp.; Aulacoseira subarctica; Aulacoseira valida; Borehole Sokli 2/2010; Caloneis bacillum; Caloneis silicula; Chironomids; Cocconeis placentula; Coscinodiscus spp.; Cyclostephanos dubius; Cyclotella meneghiniana; Cyclotella radiosa; Cyclotella spp.; Cyclotella stelligera; Cymatopleura elliptica; Cymatopleura solea; Cymbella affinis; Cymbella aspera; Cymbella cistula; Cymbella cuspidata; Cymbella cymbiformis; Cymbella ehrenbergii; Cymbella mesiana; Cymbella naviculiformis; Cymbella proxima; Cymbella silesiaca; Cymbella sinuata; Cymbella spp.; Cymbella subaequalis; Cymbella subcuspidata; Denticula kuetzingii; Denticula tenuis; DEPTH, sediment/rock; Diatoma mesodon; Diatom analysis (Battarbee, 1986, in Berglund, Handbook of Holocene Pal.); Diatoma vulgaris; diatoms; Diatoms; Diatoms, aerophilic; Diatoms, benthic; Diatoms, planktic; Diatoms, rheophilic; Diatoms, tertiary; Diatoms, tychoplanktic; Diatoms indeterminata; Diploneis elliptica; Diploneis finnica; Epithemia adnata; Epithemia argus; Epithemia sorex; Epithemia turgida; Eunotia spp.; Finland; Fragilaria capucina; Fragilaria constricta; Fragilaria nitzschioides; Fragilaria parasitica; Fragilaria pseudoconstruens; Fragilaria ulna; Frustulia rhomboides; Gomphonema acuminatum; Gomphonema affine; Gomphonema angustatum; Gomphonema angustum; Gomphonema augur; Gomphonema clavatum; Gomphonema gracile; Gomphonema olivaceum; Gomphonema spp.; Gomphonema truncatum; Gyrosigma acuminatum; Hantzschia amphioxys; HPC; Hydraulic piston corer; LOI; Macro-remains; Melosira lineata; Melosira moniliformis; Melosira nummuloides; Meridion circulare; MIS-5a; Navicula bacillum; Navicula capitata; Navicula cari; Navicula crucicula; Navicula cryptocephala; Navicula decussis; Navicula elginensis; Navicula exigua; Navicula exigua var. signata; Navicula gastrum; Navicula jentzschii; Navicula laevissima; Navicula laterostrata; Navicula libonensis; Navicula menisculus; Navicula mutica; Navicula oblonga; Navicula placentula; Navicula protracta; Navicula pupula; Navicula radiosa; Navicula recens; Navicula reinhardtii; Navicula rhynchocephala; Navicula scutelloides; Navicula seibigiana; Navicula similis; Navicula slesvicensis; Navicula spp.; Navicula striolata; Navicula tuscula; Navicula viridula; Neidium ampliatum; Neidium dubium; Neidium productum; Nitzschia amphibia; Nitzschia angustata; Nitzschia frustulum; non-pollen palynomorphs; Odderade; Orthoseira roeseana; Pinnularia borealis; Pinnularia gibba; Pinnularia interrupta; Pinnularia maior; Pinnularia microstauron; Pinnularia nodosa; Pinnularia spp.; Pinnularia streptoraphe; Pinnularia viridis; Pollen; Pseudostaurosira robusta; Rhoicosphenia abbreviata; Rhopalodia gibba; Sokli; Sokli_2010/2; Stauroneis anceps; Stauroneis phoenicenteron; Stauroneis smithii; Staurosira brevistriata; Staurosira construens; Staurosira construens var. binodis; Staurosira construens var. construens; Staurosira construens var. subsalina; Staurosira construens var. venter; Staurosira neoproducta; Staurosirella lapponica; Staurosirella leptostauron; Staurosirella martyi; Staurosirella pinnata; Stephanodiscus alpinus; Stephanodiscus hantzschii; Stephanodiscus medius; Stephanodiscus minutulus; Stephanodiscus neoastraea; Tabellaria fenestrata; Tabellaria flocculosa; Tetracyclus ellipticus; Tetracyclus emarginatus; Tetracyclus glans; Tetracyclus rupestris; Unknown This dataset provides counts of diatom valves for the MIS-5a sediment sequence retrieved from Sokli (Finland) in 2010. Counts per taxon are presented against depth (m); total sums for classes of diatoms (e.g. Sum Benthic Taxa) are presented as well. The diatom dataset provides information on MIS 5a lake ecosystem dynamics (Helmens et al., 2021). A total of 22 samples were selected for diatom analysis. Diatoms were extracted from the sediment following the protocol presented by Battarbee et al. (2003). First, organic matter was oxidized in H2O2 in a water bath (at c. 100 °C). Subsequently, carbonates were removed by 10% HCl treatment (no visible reaction). Clay particles were decanted from 100 ml beakers after sedimentation overnight. Sand grains were removed after five seconds of sedimentation. The residue was mounted in Naphrax® and analysed under a light microscope with X1000 magnification using immersion oil. Flora used for species identification and information on ecological preferences are presented in Helmens et al. (2009). A minimum of 500 diatom valves were identified from each of the samples (average count = 1322, range = 531-2264 valves). All analyses were performed in the laboratories Stockholm University, Sweden. |
| title | Diatom valve counts of the MIS-5a sediment sequence from Sokli (Finland) in 2010 |
| topic | Achnanthes bioretii; Achnanthes clevei; Achnanthes conspicua; Achnanthes distincta; Achnanthes exigua; Achnanthes flexella; Achnanthes helvetica; Achnanthes holstii; Achnanthes joursacense; Achnanthes lanceolata; Achnanthes minutissima; Achnanthes oestrupii; Achnanthes spp.; Amphora fogediana; Amphora libyca; Amphora ovalis; Amphora pediculus; Amphora spp.; Anomoeoneis brachysira; Anomoeoneis sphaerophora; Aulacoseira alpigena; Aulacoseira ambigua; Aulacoseira crenulata; Aulacoseira distans; Aulacoseira granulata; Aulacoseira granulata var. angustissima; Aulacoseira islandica; Aulacoseira italica; Aulacoseira lacustris; Aulacoseira lirata; Aulacoseira muzzanensis; Aulacoseira spp.; Aulacoseira subarctica; Aulacoseira valida; Borehole Sokli 2/2010; Caloneis bacillum; Caloneis silicula; Chironomids; Cocconeis placentula; Coscinodiscus spp.; Cyclostephanos dubius; Cyclotella meneghiniana; Cyclotella radiosa; Cyclotella spp.; Cyclotella stelligera; Cymatopleura elliptica; Cymatopleura solea; Cymbella affinis; Cymbella aspera; Cymbella cistula; Cymbella cuspidata; Cymbella cymbiformis; Cymbella ehrenbergii; Cymbella mesiana; Cymbella naviculiformis; Cymbella proxima; Cymbella silesiaca; Cymbella sinuata; Cymbella spp.; Cymbella subaequalis; Cymbella subcuspidata; Denticula kuetzingii; Denticula tenuis; DEPTH, sediment/rock; Diatoma mesodon; Diatom analysis (Battarbee, 1986, in Berglund, Handbook of Holocene Pal.); Diatoma vulgaris; diatoms; Diatoms; Diatoms, aerophilic; Diatoms, benthic; Diatoms, planktic; Diatoms, rheophilic; Diatoms, tertiary; Diatoms, tychoplanktic; Diatoms indeterminata; Diploneis elliptica; Diploneis finnica; Epithemia adnata; Epithemia argus; Epithemia sorex; Epithemia turgida; Eunotia spp.; Finland; Fragilaria capucina; Fragilaria constricta; Fragilaria nitzschioides; Fragilaria parasitica; Fragilaria pseudoconstruens; Fragilaria ulna; Frustulia rhomboides; Gomphonema acuminatum; Gomphonema affine; Gomphonema angustatum; Gomphonema angustum; Gomphonema augur; Gomphonema clavatum; Gomphonema gracile; Gomphonema olivaceum; Gomphonema spp.; Gomphonema truncatum; Gyrosigma acuminatum; Hantzschia amphioxys; HPC; Hydraulic piston corer; LOI; Macro-remains; Melosira lineata; Melosira moniliformis; Melosira nummuloides; Meridion circulare; MIS-5a; Navicula bacillum; Navicula capitata; Navicula cari; Navicula crucicula; Navicula cryptocephala; Navicula decussis; Navicula elginensis; Navicula exigua; Navicula exigua var. signata; Navicula gastrum; Navicula jentzschii; Navicula laevissima; Navicula laterostrata; Navicula libonensis; Navicula menisculus; Navicula mutica; Navicula oblonga; Navicula placentula; Navicula protracta; Navicula pupula; Navicula radiosa; Navicula recens; Navicula reinhardtii; Navicula rhynchocephala; Navicula scutelloides; Navicula seibigiana; Navicula similis; Navicula slesvicensis; Navicula spp.; Navicula striolata; Navicula tuscula; Navicula viridula; Neidium ampliatum; Neidium dubium; Neidium productum; Nitzschia amphibia; Nitzschia angustata; Nitzschia frustulum; non-pollen palynomorphs; Odderade; Orthoseira roeseana; Pinnularia borealis; Pinnularia gibba; Pinnularia interrupta; Pinnularia maior; Pinnularia microstauron; Pinnularia nodosa; Pinnularia spp.; Pinnularia streptoraphe; Pinnularia viridis; Pollen; Pseudostaurosira robusta; Rhoicosphenia abbreviata; Rhopalodia gibba; Sokli; Sokli_2010/2; Stauroneis anceps; Stauroneis phoenicenteron; Stauroneis smithii; Staurosira brevistriata; Staurosira construens; Staurosira construens var. binodis; Staurosira construens var. construens; Staurosira construens var. subsalina; Staurosira construens var. venter; Staurosira neoproducta; Staurosirella lapponica; Staurosirella leptostauron; Staurosirella martyi; Staurosirella pinnata; Stephanodiscus alpinus; Stephanodiscus hantzschii; Stephanodiscus medius; Stephanodiscus minutulus; Stephanodiscus neoastraea; Tabellaria fenestrata; Tabellaria flocculosa; Tetracyclus ellipticus; Tetracyclus emarginatus; Tetracyclus glans; Tetracyclus rupestris; Unknown |
| url | https://doi.org/10.1594/PANGAEA.983896 |