Diatom valves for the Holocene sediment sequence retrieved from Lake Loitsana, Finland
Data Publisher for Earth & Environmental Science
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.
Berglund, B E (ed.), Handbook of Holocene Palaeoecology and Palaeohydrology: Toronto, John Wiley and Sons
Flexible paleoclimate age-depth models using an autoregressive gamma process
Early MIS 3 glacial lake evolution, ice-marginal retreat pattern and climate at Sokli (northeastern Fennoscandia)
Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake
Evaluating environmental drivers of Holocene changes in water chemistry and aquatic biota composition at Lake Loitsana, NE Finland
Calculated, according to Shala et al. (2017)
Calculated according to Blaauw and Christen (2011)
Light microscope, Zeiss [1000x magnification]
Aulacoseira islandica (O. Müller) Simonsen
Aulacoseira subartica (O. Müller) Haworth
Cyclostephanos dubius (Fricke in A. Schmidt) Round
Stephanodiscus cf. hantzschii Grunow (in Cleve & Grunow)
Stephanodiscus parvus Stoermer & Håkansson
Aulacoseira distans (Ehrenberg) Simonsen
Aulacoseira lirata var. biseriata (Grunow) Haworth
Fragilaria capucina var. mesolepta (Rabenhorst) Rabenhorst
Fragilaria capucina var. rumpens (Kützing) Lange-Bertalot
Fragilaria capucina var. vaucheriae (Kützing) Lange-Bertalot
Achnanthes lanceolata (Brébisson) Grunow
Achnanthes lanceolata ssp frequentissima Lange-Bertalot
Aneumastus tuscula (Ehrenberg) Mann & Stickle
Anomoeoneis sphaerophora (Ehrenberg) Pfitzer
Aulacoseira italica (Ehrenberg) Simonsen
Aulacoseira italica var. tenuissima (Grunow) Simonsen
Campylodiscus noricus var. hibernicus (Ehrenberg)
Cocconeis placentula var. euglypta (Ehrenberg) Grunow
Cocconeis placentula var. lineata (Ehrenberg) van Heurck
Cocconeis placentula var. pseudolineata Geitler
Cymatopleura solea (Brébisson & Godey) W. Smith
Cymbella proxima Reimer in Patrick and Reimer
Cymbella subaequalis Grunow in Van Heurck
Didymosphenia geminata (Lyngbye) M. Schmidt
Diploneis elliptica var. elliptica (Kützing) Cleve
Ellerbeckia arenaria f. teres (Brun) Crawford
Encyonema silesiacum (Bleisch in Rabenhorst) Mann
Epithemia turgida var. granulata (Ehrenberg) Brun
Epithemia turgida var. turgida (Ehrenberg) Kützing
Eunotia praerupta var. papilio (Grunow) Nörpel
Fragilariforma neoproducta Lange-Bertalot
Frustulia amphipleuroides (Grunow in Cleve & Grunow) Cleve-Euler
Gomphonema acuminatum var. acuminatum Ehrenberg
Gomphonema angustatum (Kützing) Rabenhorst
Gomphonema olivaceum (Hornemann) Brébisson
Gomphonema parvulum var. parvulum (Kützing) Kützing
Gyrosigma acuminatum (Kützing) Rabenhorst
Hippodonta capitata (Ehrenberg) Lange-Bertalot, Metzeltin & Witkowski
Hippodonta lueneburgensis (Grunow) Lange-Bertalot, Metzeltin & Witkowski
Navicula scutelloides W. Smith ex. Gregory
Navicula upsaliensis (Grunow) M.Peragallo
Nitzschia intermedia Hantzsch ex Cleve & Grunow
Orthoseira dendroteres (Ehrenberg) Crawford
Pinnularia microstauron (Ehrenberg) Cleve
Pinnularia viridis f. cuneatiformis Cleve-Euler
Pseudostaurosira brevistriata (Grunow in Van Heurck) Williams & Round
Pseudostaurosira pseudoconstruens (Marciniak) Williams & Round
Rhoicosphenia abbreviata (Agardh) Lange-Bertalot
Rhopalodia gibba var. gibba (Ehrenberg) O. Müller
Sellaphora pupula (Kützing) Mereschkowsky
Stauroneis phoenicenteron (Nitzsch) Ehrenberg
Staurosira construens var. binodis (Ehrenberg) Hamilton
Staurosira venter (Ehrenberg) H.Kobayasi
Staurosirella lapponica (Grunow in Van Heurck) Williams & Round
Staurosirella leptostauron (Ehrenberg) Williams & Round
Staurosirella pinnata var. pinnata (Ehrenberg) Williams & Round
Surirella linearis var. linearis W. Smith
Surirella linearis var. constricta Hustedt
Synedra parasitica var. subconstricta (Grunow in Van Heurck) Hustedt
Tetracyclus emarginatus (Ehrenberg) W. Smith
Diploneis oblongella (Naegeli) Cleve-Euler
Hantzschia amphioxys (Ehrenberg) Grunow in Cleve & Grunow
Neidium bisulcatum var. subampliatum Krammer
Pinnularia borealis var. scalaris (Ehrenberg) Rabenhorst
Reimeria sinuata (Gregory) Kociolek & Stoermer
Aulacoseira italica f. crenulata (Ehrenberg) R. Ross in Hartley
Meridion circulare var. circulare (Greville) Agardh
Meridion circulare var. constrictum (Ralfs) van Heurck
Chironomids; C/N; diatoms; Finland; Holocene; Itrax; LOI; Macro-remains; Pollen; Sokli; Stable isotopes
Further funding was provided by SKB (Swedish Nuclear Fuel and Waste Management Company) and the Bolin Centre for Climate Research.