Diatom valves for the Holocene sediment sequence retrieved from Lake Loitsana, Finland
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2025
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| author | Shala, Shyhrete Helmens, Karin Engels, Stefan Kuhry, Peter Kylander, Malin E Luoto, Tomi P Salonen, Sakari Väliranta, Minna Weckström, Jan |
| author_facet | Shala, Shyhrete Helmens, Karin Engels, Stefan Kuhry, Peter Kylander, Malin E Luoto, Tomi P Salonen, Sakari Väliranta, Minna Weckström, Jan |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | This dataset provides counts of diatom valves for the Holocene sediment sequence retrieved from Lake Loitsana (Finland) in 2008. Counts per taxon are presented against both depth (m) and age (cal ka. BP); total sums for classes of diatoms (e.g. total benthic taxa) and all counts are presented as well. Two age/depths models are presented: the first model represents the original age/depth model applied to the records (Shala et al., 2014; 2017) and the second age/depth model, which is the author-preferred version, presents updated age-estimates derived using the r package 'Bacon' (Blaauw and Christensen, 2011). The diatom dataset provides information on Holocene lake ecosystem dynamics and was used to quantitatively reconstruct Total Phosphorous (TP) values of the lake water. A total of 124 samples were selected for diatom analysis. Diatoms were extracted from the sediment following the protocol presented by Battarbee (1986). 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 (2h intervals). 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 diatoms were identified from each sample with the exception of samples at 900-700 cm where diatom abundance was low. All analyses were performed in the laboratories Stockholm University, Sweden. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_975088 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Diatom valves for the Holocene sediment sequence retrieved from Lake Loitsana, Finland Shala, Shyhrete Helmens, Karin Engels, Stefan Kuhry, Peter Kylander, Malin E Luoto, Tomi P Salonen, Sakari Väliranta, Minna Weckström, Jan Achnanthes clevei; Achnanthes conspicua; Achnanthes exigua; Achnanthes lanceolata; Achnanthes lanceolata ssp. Lanceolata; Achnanthes laterostrata; Achnanthes oblongella; Achnanthes peragalli; Achnanthes spp.; Achnanthes ziegleri; Aerophilous species; Age model; Amphora inariensis; Amphora libyca; Amphora ovalis; Amphora pediculus; Amphora spp.; Aneumastus tuscula; Anomoeoneis sphaerophora; Aulacoseira alpigena; Aulacoseira ambigua; Aulacoseira crassipunctata; Aulacoseira distans; Aulacoseira islandica; Aulacoseira italica; Aulacoseira italica cf. crenulata; Aulacoseira italica var. tenuissima; Aulacoseira lirata var. biseriata; Aulacoseira spp.; Aulacoseira subarctica; Aulacoseira valida; C/N; Calculated, according to Shala et al. (2017); Calculated according to Blaauw and Christen (2011); Caloneis bacillum; Caloneis schumanniana; Caloneis spp.; Caloneis ventricosa; Campylodiscus noricus var. hibernicus; Chironomids; Cocconeis disculus; Cocconeis neodiminuta; Cocconeis placentula; Cocconeis placentula var. euglypta; Cocconeis placentula var. lineata; Cocconeis placentula var. pseudolineata; Coscinodiscus sp.; Craticula cuspidata; Cyclostephanos dubius; Cyclotella meneghiniana; Cyclotella ocellata; Cyclotella radiosa; Cyclotella rossii; Cyclotella spp.; Cymatopleura solea; Cymatopleura spp.; Cymbella affinis; Cymbella amphicephala; Cymbella aspera; Cymbella cistula; Cymbella cuspidata; Cymbella cymbiformis; Cymbella ehrenbergii; Cymbella helvetica; Cymbella minuta; Cymbella naviculiformis; Cymbella paucistriata; Cymbella proxima; Cymbella reichardtii; Cymbella simonsenii; Cymbella spp.; Cymbella subaequalis; Cymbella subcuspidata; DEPTH, sediment/rock; Diatoma mesodon; diatoms; Diatoms; Diatoms, benthic; Diatoms, other; Diatoms, planktic; Diatoms, reworked; Diatoms, tychoplanktic; Didymosphenia geminata; Diploneis elliptica var. elliptica; Diploneis oblongella; Diploneis oculata; Diploneis parma; Ellerbeckia arenaria var. teres; Encyonema silesiacum; Epithemia adnata; Epithemia sorex var. sorex; Epithemia spp.; Epithemia turgida var. granulata; Epithemia turgida var. turgida; Eunotia curvata; Eunotia praerupta; Eunotia praerupta var. papilio; Eunotia spp.; Finland; Fragilaria bidens; Fragilaria capucina var. capucina; Fragilaria capucina var. mesolepta; Fragilaria capucina var. rumpens; Fragilaria capucina var. vaucheriae; Fragilaria nitzschioides; Fragilaria robusta; Fragilaria spp.; Fragilaria virescens; Fragilariforma neoproducta; Frustulia amphipleuroides; Frustulia vulgaris; Gomphonema acuminatum; Gomphonema angustatum; Gomphonema clavatum; Gomphonema gracile; Gomphonema minutum; Gomphonema ovaliceum; Gomphonema parvulum; Gomphonema spp.; Gomphonema truncatum; Gyrosigma acuminatum; Hantzschia amphioxys; Hemiaulus sp.; Hippodonta capitata; Hippodonta lueneburgensis; Holocene; Itrax; Light microscope, Zeiss [1000x magnification]; LL; LOI; Loitsana_Lake; Macro-remains; Martyana martyi; Melosira varians; Meridion circulare var. circulare; Meridion circulare var. constrictum; Navicula abiskoensis; Navicula absoluta; Navicula cari; Navicula clementioides; Navicula clementis; Navicula constans; Navicula cryptocephala; Navicula cryptotenella; Navicula decussis; Navicula digitoradiata; Navicula exigua; Navicula explanata; Navicula gastrum; Navicula harderi; Navicula laevissima; Navicula lapidosa; Navicula laterostrata; Navicula menisculus; Navicula minima; Navicula placentula; Navicula protracta; Navicula pseudoventralis; Navicula radiosa; Navicula reinhardtii; Navicula rhynchocephala; Navicula rotunda; Navicula schoenfeldii; Navicula scutelloides; Navicula sect. Minusculae; Navicula spp.; Navicula submuralis; Navicula subrotundata; Navicula upsaliensis; Navicula viridula; Navicula vitabunda; Navicula vulpina; Neidium affine; Neidium ampliatum; Neidium bisulcatum var. subampliatum; Neidium dubium; Neidium iridis; Neidium spp.; Nitzschia amphibia; Nitzschia fossilis; Nitzschia intermedia; Nitzschia spp.; Opephora gemmata; Orthoseira dendroteres; Paralia sulcata; Paralia sulcata var. biseriata; Pinnularia abaujensis; Pinnularia borealis var. scalaris; Pinnularia interrupta; Pinnularia microstauron; Pinnularia pulchra; Pinnularia spp.; Pinnularia streptoraphe; Pinnularia subcapitata; Pinnularia viridis cf. cuneatiformi; Placoneis elginensis; Pollen; Pseudostaurosira brevistriata; Pseudostaurosira pseudoconstruens; Reimeria sinuata; Rheophilous species; Rhoicosphenia abbreviata; Rhopalodia gibba var. gibba; RPC; Russian peat corer; Sellaphora bacillum; Sellaphora pupula; Sokli; Stable isotopes; Stauroneis acuta; Stauroneis anceps; Stauroneis phoenicenteron; Stauroneis producta; Stauroneis spp.; Staurosira binodis; Staurosira construens; Staurosira venter; Staurosirella lapponica; Staurosirella leptostauron; Staurosirella pinnata var. pinnata; Stephanodiscus cf. hantzschii; Stephanodiscus medius; Stephanodiscus parvus; Stephanodiscus spp.; Stephanopyxis sp.; Surirella linearis; Surirella linearis var. constricta; Surirella spp.; Synedra parasitica; Synedra parasitica var. subconstricta; Tabellaria flocculosa; Tabellaria spp.; Tertiary species; Tetracyclus emarginatus; Tetracyclus glans; Ulnaria ulna; Varia This dataset provides counts of diatom valves for the Holocene sediment sequence retrieved from Lake Loitsana (Finland) in 2008. Counts per taxon are presented against both depth (m) and age (cal ka. BP); total sums for classes of diatoms (e.g. total benthic taxa) and all counts are presented as well. Two age/depths models are presented: the first model represents the original age/depth model applied to the records (Shala et al., 2014; 2017) and the second age/depth model, which is the author-preferred version, presents updated age-estimates derived using the r package 'Bacon' (Blaauw and Christensen, 2011). The diatom dataset provides information on Holocene lake ecosystem dynamics and was used to quantitatively reconstruct Total Phosphorous (TP) values of the lake water. A total of 124 samples were selected for diatom analysis. Diatoms were extracted from the sediment following the protocol presented by Battarbee (1986). 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 (2h intervals). 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 diatoms were identified from each sample with the exception of samples at 900-700 cm where diatom abundance was low. All analyses were performed in the laboratories Stockholm University, Sweden. |
| title | Diatom valves for the Holocene sediment sequence retrieved from Lake Loitsana, Finland |
| topic | Achnanthes clevei; Achnanthes conspicua; Achnanthes exigua; Achnanthes lanceolata; Achnanthes lanceolata ssp. Lanceolata; Achnanthes laterostrata; Achnanthes oblongella; Achnanthes peragalli; Achnanthes spp.; Achnanthes ziegleri; Aerophilous species; Age model; Amphora inariensis; Amphora libyca; Amphora ovalis; Amphora pediculus; Amphora spp.; Aneumastus tuscula; Anomoeoneis sphaerophora; Aulacoseira alpigena; Aulacoseira ambigua; Aulacoseira crassipunctata; Aulacoseira distans; Aulacoseira islandica; Aulacoseira italica; Aulacoseira italica cf. crenulata; Aulacoseira italica var. tenuissima; Aulacoseira lirata var. biseriata; Aulacoseira spp.; Aulacoseira subarctica; Aulacoseira valida; C/N; Calculated, according to Shala et al. (2017); Calculated according to Blaauw and Christen (2011); Caloneis bacillum; Caloneis schumanniana; Caloneis spp.; Caloneis ventricosa; Campylodiscus noricus var. hibernicus; Chironomids; Cocconeis disculus; Cocconeis neodiminuta; Cocconeis placentula; Cocconeis placentula var. euglypta; Cocconeis placentula var. lineata; Cocconeis placentula var. pseudolineata; Coscinodiscus sp.; Craticula cuspidata; Cyclostephanos dubius; Cyclotella meneghiniana; Cyclotella ocellata; Cyclotella radiosa; Cyclotella rossii; Cyclotella spp.; Cymatopleura solea; Cymatopleura spp.; Cymbella affinis; Cymbella amphicephala; Cymbella aspera; Cymbella cistula; Cymbella cuspidata; Cymbella cymbiformis; Cymbella ehrenbergii; Cymbella helvetica; Cymbella minuta; Cymbella naviculiformis; Cymbella paucistriata; Cymbella proxima; Cymbella reichardtii; Cymbella simonsenii; Cymbella spp.; Cymbella subaequalis; Cymbella subcuspidata; DEPTH, sediment/rock; Diatoma mesodon; diatoms; Diatoms; Diatoms, benthic; Diatoms, other; Diatoms, planktic; Diatoms, reworked; Diatoms, tychoplanktic; Didymosphenia geminata; Diploneis elliptica var. elliptica; Diploneis oblongella; Diploneis oculata; Diploneis parma; Ellerbeckia arenaria var. teres; Encyonema silesiacum; Epithemia adnata; Epithemia sorex var. sorex; Epithemia spp.; Epithemia turgida var. granulata; Epithemia turgida var. turgida; Eunotia curvata; Eunotia praerupta; Eunotia praerupta var. papilio; Eunotia spp.; Finland; Fragilaria bidens; Fragilaria capucina var. capucina; Fragilaria capucina var. mesolepta; Fragilaria capucina var. rumpens; Fragilaria capucina var. vaucheriae; Fragilaria nitzschioides; Fragilaria robusta; Fragilaria spp.; Fragilaria virescens; Fragilariforma neoproducta; Frustulia amphipleuroides; Frustulia vulgaris; Gomphonema acuminatum; Gomphonema angustatum; Gomphonema clavatum; Gomphonema gracile; Gomphonema minutum; Gomphonema ovaliceum; Gomphonema parvulum; Gomphonema spp.; Gomphonema truncatum; Gyrosigma acuminatum; Hantzschia amphioxys; Hemiaulus sp.; Hippodonta capitata; Hippodonta lueneburgensis; Holocene; Itrax; Light microscope, Zeiss [1000x magnification]; LL; LOI; Loitsana_Lake; Macro-remains; Martyana martyi; Melosira varians; Meridion circulare var. circulare; Meridion circulare var. constrictum; Navicula abiskoensis; Navicula absoluta; Navicula cari; Navicula clementioides; Navicula clementis; Navicula constans; Navicula cryptocephala; Navicula cryptotenella; Navicula decussis; Navicula digitoradiata; Navicula exigua; Navicula explanata; Navicula gastrum; Navicula harderi; Navicula laevissima; Navicula lapidosa; Navicula laterostrata; Navicula menisculus; Navicula minima; Navicula placentula; Navicula protracta; Navicula pseudoventralis; Navicula radiosa; Navicula reinhardtii; Navicula rhynchocephala; Navicula rotunda; Navicula schoenfeldii; Navicula scutelloides; Navicula sect. Minusculae; Navicula spp.; Navicula submuralis; Navicula subrotundata; Navicula upsaliensis; Navicula viridula; Navicula vitabunda; Navicula vulpina; Neidium affine; Neidium ampliatum; Neidium bisulcatum var. subampliatum; Neidium dubium; Neidium iridis; Neidium spp.; Nitzschia amphibia; Nitzschia fossilis; Nitzschia intermedia; Nitzschia spp.; Opephora gemmata; Orthoseira dendroteres; Paralia sulcata; Paralia sulcata var. biseriata; Pinnularia abaujensis; Pinnularia borealis var. scalaris; Pinnularia interrupta; Pinnularia microstauron; Pinnularia pulchra; Pinnularia spp.; Pinnularia streptoraphe; Pinnularia subcapitata; Pinnularia viridis cf. cuneatiformi; Placoneis elginensis; Pollen; Pseudostaurosira brevistriata; Pseudostaurosira pseudoconstruens; Reimeria sinuata; Rheophilous species; Rhoicosphenia abbreviata; Rhopalodia gibba var. gibba; RPC; Russian peat corer; Sellaphora bacillum; Sellaphora pupula; Sokli; Stable isotopes; Stauroneis acuta; Stauroneis anceps; Stauroneis phoenicenteron; Stauroneis producta; Stauroneis spp.; Staurosira binodis; Staurosira construens; Staurosira venter; Staurosirella lapponica; Staurosirella leptostauron; Staurosirella pinnata var. pinnata; Stephanodiscus cf. hantzschii; Stephanodiscus medius; Stephanodiscus parvus; Stephanodiscus spp.; Stephanopyxis sp.; Surirella linearis; Surirella linearis var. constricta; Surirella spp.; Synedra parasitica; Synedra parasitica var. subconstricta; Tabellaria flocculosa; Tabellaria spp.; Tertiary species; Tetracyclus emarginatus; Tetracyclus glans; Ulnaria ulna; Varia |
| url | https://doi.org/10.1594/PANGAEA.975088 |