Diatom counts from borehole Sokli B series in Sokli (Finland) in 2002
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2025
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| author | Helmens, Karin Bergman, Jonas Engels, Stefan Kaislahti, Päivi Shala, Shyhrete Väliranta, Minna |
| author_facet | Helmens, Karin Bergman, Jonas Engels, Stefan Kaislahti, Päivi Shala, Shyhrete Väliranta, Minna |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | This dataset provides counts of diatom valves for the Early Weichselian sediment sequence retrieved from Sokli (Finland) in 2002. Counts per taxon are presented against depth (m); total sums for classes of diatoms (e.g. total benthic diatoms) are presented as well. The diatom dataset provides information on MIS 5c lake ecosystem dynamics (Helmens et al., 2012). A total of 10 samples were selected for diatom analysis. Diatoms were extracted from the sediment following the protocol presented by Battarbee et al. (2002). 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 1000 diatom valves were identified from each of the 6 uppermost samples. The bottommost samples had low diatom concentration and total count sums vary between 4 and 112 in these samples. All analyses were performed in the laboratories Stockholm University, Sweden. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_983424 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Diatom counts from borehole Sokli B series in Sokli (Finland) in 2002 Helmens, Karin Bergman, Jonas Engels, Stefan Kaislahti, Päivi Shala, Shyhrete Väliranta, Minna Achnanthes bioretii; Achnanthes lanceolata; Achnanthes lanceolata ssp. biporoma; Achnanthes lanceolata ssp. frequentissima; Achnanthes peragalli; Achnanthidium minutissimum; Amphora aequalis; Amphora inariensis; Amphora libyca; Amphora ovalis; Amphora spp.; Aneumastus pseudotusculus; Aneumastus tuscula; Anomoeoneis sphaerophora; Aulacoseira ambigua; Aulacoseira islandica; Aulacoseira italica; Aulacoseira italica cf. crenulata; Aulacoseira spp.; Aulacoseira subarctica; Aulacoseira valida; Borehole Sokli B series; Brorup; Caloneis ventricosa; Chironomids; Cocconeis placentula; Cocconeis placentula var. euglypta; Cocconeis placentula var. klinoraphis; Cocconeis placentula var. lineata; Cocconeis placentula var. pseudolineata; Cocconeis pseudothumensis; Craticula cuspidata; Cymatopleura solea; Cymbella cistula; Cymbella cuspidata; Cymbella ehrenbergii; Cymbella heteropleura; Cymbella naviculiformis; Cymbella spp.; Cymbella subaequalis; DEPTH, sediment/rock; Diatoma hyemalis; Diatoma mesodon; Diatom analysis (Battarbee, 1986, in Berglund, Handbook of Holocene Pal.); Diatoma spp.; diatoms; Diatoms, aerophilic; Diatoms, benthic; Diatoms, planktic; Diatoms, reworked or tertiary; Diatoms, rheophilic; Diatoms, tychoplanktic; Diatoms indeterminata; Diploneis elliptica var. elliptica; Diploneis oblongella; Encyonema brehmii; Encyonema silesiacum; Epithemia adnata; Epithemia frickei; Epithemia sorex var. sorex; Epithemia spp.; Epithemia turgida var. granulata; Epithemia turgida var. turgida; Eunotia curvata; Eunotia implicata; Eunotia pectinalis var. minor; Eunotia praerupta; Eunotia spp.; Fallacia helensis; Finland; Fragilaria capucina var. capucina; Fragilaria robusta; Fragilaria spp.; Fragilariforma neoproducta; Frustulia vulgaris; Gomphonema acuminatum; Gomphonema angustatum; Gomphonema clavatum; Gomphonema minutum; Gomphonema ovaliceum; Gomphonema parvulum; Gomphonema spp.; Gomphonema truncatum; Hantzschia amphioxys; Hemiaulus sp.; Hippodonta capitata; Hippodonta lueneburgensis; Hydraulic piston corer, GM 100; loss on ignition; Luticola mutica; Macro-remains; Martyana martyi; Melosira varians; Meridion circulare var. circulare; Meridion circulare var. constrictum; MIS-5cd; Navicula absoluta; Navicula amphibola; Navicula cari; Navicula constans; Navicula decussis; Navicula digitoradiata; Navicula eidrigeana; Navicula gastrum; Navicula hambergii; Navicula joubaudii; Navicula laevissima; Navicula menisculus; Navicula menisculus var. upsaliensis; Navicula placentula; Navicula pusilla; Navicula radiosa; Navicula reinhardtii; Navicula rhynchocephala; Navicula spp.; Navicula viridula; Neidium ampliatum; Neidium bisulcatum var. subampliatum; Neidium dubium; Neidium spp.; Nitzschia intermedia; Nitzschia spp.; non-pollen palynomorphs; Paralia sulcata; Pinnularia abaujensis; Pinnularia borealis var. scalaris; Pinnularia interrupta; Pinnularia microstauron; Pinnularia pulchra; Pinnularia spp.; Pinnularia streptoraphe; Pinnularia subcapitata; Pinnularia viridis; Placoneis elginensis; Pollen; Pseudostaurosira brevistriata; Reimeria sinuata; Rhopalodia gibba var. gibba; Sellaphora bacillum; Sellaphora pupula; Sokli; Sokli_2002/4; Stauroneis anceps; Stauroneis phoenicenteron; Stauroneis spp.; Staurosira construens; Staurosira construens var. binodis; Staurosira venter; Staurosirella lapponica; Staurosirella leptostauron; Staurosirella pinnata var. pinnata; Stephanodiscus alpinus; Stephanodiscus parvus; Surirella spp.; Synedra parasitica var. subconstricta; Tabellaria flocculosa; Tabellaria spp.; Tetracyclus emarginatus; Ulnaria capitata; Ulnaria ulna; Varia This dataset provides counts of diatom valves for the Early Weichselian sediment sequence retrieved from Sokli (Finland) in 2002. Counts per taxon are presented against depth (m); total sums for classes of diatoms (e.g. total benthic diatoms) are presented as well. The diatom dataset provides information on MIS 5c lake ecosystem dynamics (Helmens et al., 2012). A total of 10 samples were selected for diatom analysis. Diatoms were extracted from the sediment following the protocol presented by Battarbee et al. (2002). 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 1000 diatom valves were identified from each of the 6 uppermost samples. The bottommost samples had low diatom concentration and total count sums vary between 4 and 112 in these samples. All analyses were performed in the laboratories Stockholm University, Sweden. |
| title | Diatom counts from borehole Sokli B series in Sokli (Finland) in 2002 |
| topic | Achnanthes bioretii; Achnanthes lanceolata; Achnanthes lanceolata ssp. biporoma; Achnanthes lanceolata ssp. frequentissima; Achnanthes peragalli; Achnanthidium minutissimum; Amphora aequalis; Amphora inariensis; Amphora libyca; Amphora ovalis; Amphora spp.; Aneumastus pseudotusculus; Aneumastus tuscula; Anomoeoneis sphaerophora; Aulacoseira ambigua; Aulacoseira islandica; Aulacoseira italica; Aulacoseira italica cf. crenulata; Aulacoseira spp.; Aulacoseira subarctica; Aulacoseira valida; Borehole Sokli B series; Brorup; Caloneis ventricosa; Chironomids; Cocconeis placentula; Cocconeis placentula var. euglypta; Cocconeis placentula var. klinoraphis; Cocconeis placentula var. lineata; Cocconeis placentula var. pseudolineata; Cocconeis pseudothumensis; Craticula cuspidata; Cymatopleura solea; Cymbella cistula; Cymbella cuspidata; Cymbella ehrenbergii; Cymbella heteropleura; Cymbella naviculiformis; Cymbella spp.; Cymbella subaequalis; DEPTH, sediment/rock; Diatoma hyemalis; Diatoma mesodon; Diatom analysis (Battarbee, 1986, in Berglund, Handbook of Holocene Pal.); Diatoma spp.; diatoms; Diatoms, aerophilic; Diatoms, benthic; Diatoms, planktic; Diatoms, reworked or tertiary; Diatoms, rheophilic; Diatoms, tychoplanktic; Diatoms indeterminata; Diploneis elliptica var. elliptica; Diploneis oblongella; Encyonema brehmii; Encyonema silesiacum; Epithemia adnata; Epithemia frickei; Epithemia sorex var. sorex; Epithemia spp.; Epithemia turgida var. granulata; Epithemia turgida var. turgida; Eunotia curvata; Eunotia implicata; Eunotia pectinalis var. minor; Eunotia praerupta; Eunotia spp.; Fallacia helensis; Finland; Fragilaria capucina var. capucina; Fragilaria robusta; Fragilaria spp.; Fragilariforma neoproducta; Frustulia vulgaris; Gomphonema acuminatum; Gomphonema angustatum; Gomphonema clavatum; Gomphonema minutum; Gomphonema ovaliceum; Gomphonema parvulum; Gomphonema spp.; Gomphonema truncatum; Hantzschia amphioxys; Hemiaulus sp.; Hippodonta capitata; Hippodonta lueneburgensis; Hydraulic piston corer, GM 100; loss on ignition; Luticola mutica; Macro-remains; Martyana martyi; Melosira varians; Meridion circulare var. circulare; Meridion circulare var. constrictum; MIS-5cd; Navicula absoluta; Navicula amphibola; Navicula cari; Navicula constans; Navicula decussis; Navicula digitoradiata; Navicula eidrigeana; Navicula gastrum; Navicula hambergii; Navicula joubaudii; Navicula laevissima; Navicula menisculus; Navicula menisculus var. upsaliensis; Navicula placentula; Navicula pusilla; Navicula radiosa; Navicula reinhardtii; Navicula rhynchocephala; Navicula spp.; Navicula viridula; Neidium ampliatum; Neidium bisulcatum var. subampliatum; Neidium dubium; Neidium spp.; Nitzschia intermedia; Nitzschia spp.; non-pollen palynomorphs; Paralia sulcata; Pinnularia abaujensis; Pinnularia borealis var. scalaris; Pinnularia interrupta; Pinnularia microstauron; Pinnularia pulchra; Pinnularia spp.; Pinnularia streptoraphe; Pinnularia subcapitata; Pinnularia viridis; Placoneis elginensis; Pollen; Pseudostaurosira brevistriata; Reimeria sinuata; Rhopalodia gibba var. gibba; Sellaphora bacillum; Sellaphora pupula; Sokli; Sokli_2002/4; Stauroneis anceps; Stauroneis phoenicenteron; Stauroneis spp.; Staurosira construens; Staurosira construens var. binodis; Staurosira venter; Staurosirella lapponica; Staurosirella leptostauron; Staurosirella pinnata var. pinnata; Stephanodiscus alpinus; Stephanodiscus parvus; Surirella spp.; Synedra parasitica var. subconstricta; Tabellaria flocculosa; Tabellaria spp.; Tetracyclus emarginatus; Ulnaria capitata; Ulnaria ulna; Varia |
| url | https://doi.org/10.1594/PANGAEA.983424 |