Helmens, Karin; Bergman, Jonas; Engels, Stefan; Kaislahti, Päivi; Shala, Shyhrete; Väliranta, Minna (2025): Chironomid counts from borehole Sokli B series in Sokli (Finland) in 2002 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983420
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Published: 2025-07-01 • DOI registered: 2025-07-30
Abstract:
This dataset provides counts of chironomid head capsules for the MIS 5cd sediment sequence retrieved from Sokli (Finland) in 2002. Counts per taxon are presented against depth (m). The chironomid dataset provides information on Early Weichselian lake and fluvial (floodplain, stream channel) ecosystem dynamics and was used to quantitatively reconstruct climate conditions (Engels et al., 2010). A total of 76 samples from the MIS 5cd sediment sequence were selected for chironomid analysis, with a higher number of samples taken from the central part of the sequence, where chironomid concentrations were low. The samples were treated with warm KOH (10%) to de-flocculate the material and subsequently rinsed through a sieve with a 100-µm mesh. The samples in the interval between 16.08 and 16.73m did not disintegrate completely after treatment with KOH, and, after trying a variety of approaches, an additional overnight treatment with cold HF was added to the preparation procedure. Chironomid head capsules (HCs) were hand-picked from the residue using a Bogorov sorting tray and mounted on permanent microscope slides using Euparal mounting medium. HCs were identified using Brooks et al. (2007). Where the sum of head capsules was below 50, neighbouring samples have been amalgamated to ensure a representative count sum was reached. The lowermost sample of the sequence contains 47 HCs but was not merged with a neighbouring sample due to the differences in the assemblage composition. The final dataset presented here contains 47 samples. All analyses were performed in the laboratories of Stockholm University, Sweden.
Keyword(s):
Related to:
Helmens, Karin F; Väliranta, Minna; Engels, Stefan; Shala, Shyhrete (2012): Large shifts in vegetation and climate during the Early Weichselian (MIS 5d-c) inferred from multi-proxy evidence at Sokli (northern Finland). Quaternary Science Reviews, 41, 22-38, https://doi.org/10.1016/j.quascirev.2012.02.008
Väliranta, Minna; Birks, Hilary H; Helmens, Karin; Engels, Stefan; Piirainen, Mikko (2009): Early Weichselian interstadial (MIS 5c) summer temperatures were higher than today in northern Fennoscandia. Quaternary Science Reviews, 28(9-10), 777-782, https://doi.org/10.1016/j.quascirev.2009.01.004
References:
Brooks, Steve J; Langdon, Peter G; Heiri, Oliver (2007): The Identification and Use of Palaearctic Chironomidae Larvae in Palaeoecology. Quaternary Research Association, Technical Guide, Quaternary Research Association, London
Quaternary Research Association Technical Guide, 10, 276 pp, https://edoc.unibas.ch/entities/publication/8701126d-f70d-4972-ad94-4b59d5cdf706
Engels, Stefan; Helmens, Karin F; Väliranta, Minna; Brooks, Stephen J; Birks, H John B (2010): Early Weichselian (MIS 5d and 5c) temperatures and environmental changes in northern Fennoscandia as recorded by chironomids and macroremains at Sokli, northeast Finland. Boreas, 39(4), 689-704, https://doi.org/10.1111/j.1502-3885.2010.00163.x
Coverage:
Latitude: 67.800278 * Longitude: 29.300278
Date/Time Start: 2002-04-15T08:00:00 * Date/Time End: 2002-04-18T18:00:00
Minimum DEPTH, sediment/rock: 13.42 m * Maximum DEPTH, sediment/rock: 19.11 m
Event(s):
Comment:
The funding was provided by Swedish Nuclear Fuel and Waste Management Company (SKB) and Bolin Centre for Climate Research (Stockholm University).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Engels, Stefan | Geocode | |
| 2 | Abiskomyia | Abiskomyia | # | Engels, Stefan | see description in data abstract | |
| 3 | Ablabesmyia | Ablabesmyia | # | Engels, Stefan | see description in data abstract | |
| 4 | Brillia | Brillia | # | Engels, Stefan | see description in data abstract | |
| 5 | Chaetocladius piger-type | C. piger-T | # | Engels, Stefan | see description in data abstract | |
| 6 | Chaetocladius-type | Chaetocladius-T | # | Engels, Stefan | see description in data abstract | |
| 7 | Chironomus anthracinus-type | C. anthracinus-T | # | Engels, Stefan | see description in data abstract | |
| 8 | Chironomus plumosus-type | C. plumosus-T | # | Engels, Stefan | see description in data abstract | |
| 9 | Cladopelma lateralis-type | C. lateralis-T | # | Engels, Stefan | see description in data abstract | |
| 10 | Cladotanytarsus mancus-type | C. mancus-T | # | Engels, Stefan | see description in data abstract | Cladotanytarsys mancus-type I |
| 11 | Cladotanytarsus mancus-type | C. mancus-T | # | Engels, Stefan | see description in data abstract | Cladotanytarsys mancus-type II |
| 12 | Corynocera ambigua | C. ambigua | # | Engels, Stefan | see description in data abstract | |
| 13 | Corynocera oliveri-type | C. oliveri-T | # | Engels, Stefan | see description in data abstract | |
| 14 | Corynoneura arctica-type | C. arctica-T | # | Engels, Stefan | see description in data abstract | |
| 15 | Corynoneura edwardsi-type | C. edwardsi-T | # | Engels, Stefan | see description in data abstract | |
| 16 | Corynoneura coronata-type | C. coronata-T | # | Engels, Stefan | see description in data abstract | |
| 17 | Corynoneura lobata-type | C. lobata-type | # | Engels, Stefan | see description in data abstract | |
| 18 | Corynoneura ?carriana-type | C. ?carriana-type | # | Engels, Stefan | see description in data abstract | |
| 19 | Cricotopus intersectus-type | C. intersectus-T | # | Engels, Stefan | see description in data abstract | |
| 20 | Cricotopus cylindraceus-type | C. cylindraceus-T | # | Engels, Stefan | see description in data abstract | |
| 21 | Cricotopus pulchripes-type | C. pulchripes-type | # | Engels, Stefan | see description in data abstract | |
| 22 | Cricotopus-type C | Cricotopus-T C | # | Engels, Stefan | see description in data abstract | |
| 23 | Orthocladius-type | Orthocladius-T | # | Engels, Stefan | see description in data abstract | |
| 24 | Orthocladius-type S | Orthocladius-T S | # | Engels, Stefan | see description in data abstract | |
| 25 | Orthocladius rivulorum-type | O. rivulorum-T | # | Engels, Stefan | see description in data abstract | |
| 26 | Cricotopus obnixus-type | C. obnixus-T | # | Engels, Stefan | see description in data abstract | |
| 27 | Cryptochironomus | Cryptochironomus | # | Engels, Stefan | see description in data abstract | |
| 28 | Diamesa | Diamesa | # | Engels, Stefan | see description in data abstract | |
| 29 | Dicrotendipes nervosus-type | D. nervosus-T | # | Engels, Stefan | see description in data abstract | |
| 30 | Diplocladius | Diplocladius | # | Engels, Stefan | see description in data abstract | |
| 31 | Einfeldia dissidens-type | E. dissidens-T | # | Engels, Stefan | see description in data abstract | |
| 32 | Endochironomus albipennis-type | E. albipennis-T | # | Engels, Stefan | see description in data abstract | |
| 33 | Eukiefferiella spp. | Eukiefferiella spp. | # | Engels, Stefan | see description in data abstract | |
| 34 | Georthocladius | Georthocladius | # | Engels, Stefan | see description in data abstract | |
| 35 | Glyptotendipes pallens-type | G. pallens-T | # | Engels, Stefan | see description in data abstract | |
| 36 | Gymnometriocnemus/Bryophaenocladius | G. Selin Co-T | # | Engels, Stefan | see description in data abstract | |
| 37 | Harnischia | Harnischia | # | Engels, Stefan | see description in data abstract | |
| 38 | Heterotrissocladius marcidus-type | H. marcidus-T | # | Engels, Stefan | see description in data abstract | |
| 39 | Heterotrissocladius subpilosus-type | H. subpilosus-T | # | Engels, Stefan | see description in data abstract | |
| 40 | Heterotrissocladius grimshawi-type | H. grimshawi-T | # | Engels, Stefan | see description in data abstract | |
| 41 | Hydrobaenus | Hydrobaenus | # | Engels, Stefan | see description in data abstract | |
| 42 | Krenopelopia | Krenopelopia | # | Engels, Stefan | see description in data abstract | |
| 43 | Lauterborniella | Lauterborniella | # | Engels, Stefan | see description in data abstract | |
| 44 | Limnophyes | Limnophyes | # | Engels, Stefan | see description in data abstract | |
| 45 | Mesocricotopus | Mesocricotopus | # | Engels, Stefan | see description in data abstract | |
| 46 | Metriocnemus eurynotus-type | M. eurynotus-T | # | Engels, Stefan | see description in data abstract | |
| 47 | Metriocnemus terrester-type | M. terrester-T | # | Engels, Stefan | see description in data abstract | |
| 48 | Microchironomus | Microchironomus | # | Engels, Stefan | see description in data abstract | |
| 49 | Micropsectra insignilobus-type | M. insignilobus-T | # | Engels, Stefan | see description in data abstract | |
| 50 | Micropsectra radialis-type | M. radialis-T | # | Engels, Stefan | see description in data abstract | |
| 51 | Microtendipes pedellus-type | M. pedellus-T | # | Engels, Stefan | see description in data abstract | |
| 52 | Monodiamesa | Monodiamesa | # | Engels, Stefan | see description in data abstract | |
| 53 | Nanocladius | Nanocladius | # | Engels, Stefan | see description in data abstract | |
| 54 | Neozavrelia | Neozavrelia | # | Engels, Stefan | see description in data abstract | |
| 55 | Oliveridia | Oliveridia | # | Engels, Stefan | see description in data abstract | |
| 56 | Omisus | Omisus | # | Engels, Stefan | see description in data abstract | |
| 57 | Parachaetocladius | Parachaetocladius | # | Engels, Stefan | see description in data abstract | |
| 58 | Parachironomus varus-type | P. varus-T | # | Engels, Stefan | see description in data abstract | |
| 59 | Paracladius | Paracladius | # | Engels, Stefan | see description in data abstract | |
| 60 | Paracricotopus | Paracricotopus | # | Engels, Stefan | see description in data abstract | |
| 61 | Paracladopelma | Paracladopelma | # | Engels, Stefan | see description in data abstract | |
| 62 | Parakiefferiella bathophila-type | P. bathophila-T | # | Engels, Stefan | see description in data abstract | |
| 63 | Parakiefferiella triquetra-type | P. triquetra-T | # | Engels, Stefan | see description in data abstract | |
| 64 | Paramerina | Paramerina | # | Engels, Stefan | see description in data abstract | |
| 65 | Parametriocnemus | Parametriocnemus | # | Engels, Stefan | see description in data abstract | |
| 66 | Paratanytarsus spp. | Paratanytarsus spp. | # | Engels, Stefan | see description in data abstract | |
| 67 | Paratanytarsus austriacus-type | P. austriacus-T | # | Engels, Stefan | see description in data abstract | |
| 68 | Paratanytarsus penicillatus-type | P. penicillatus-T | # | Engels, Stefan | see description in data abstract | |
| 69 | Paratendipes albimanus-type | P. albimannus-T | # | Engels, Stefan | see description in data abstract | |
| 70 | Phaenopsectra flavipes-type | P. flavipes-T | # | Engels, Stefan | see description in data abstract | |
| 71 | Polypedilum nubeculosum-type | P. nubeculosum-T | # | Engels, Stefan | see description in data abstract | |
| 72 | Polypedilum nubifer-type | P. nubifer-T | # | Engels, Stefan | see description in data abstract | |
| 73 | Procladius | Procladius | # | Engels, Stefan | see description in data abstract | |
| 74 | Prodiamesa | Prodiamesa | # | Engels, Stefan | see description in data abstract | |
| 75 | Protanypus | Protanypus | # | Engels, Stefan | see description in data abstract | |
| 76 | Psectrocladius septentrionalis-type | P. septentrionalis-T | # | Engels, Stefan | see description in data abstract | |
| 77 | Psectrocladius psilopterus-type | P. psilopterus-T | # | Engels, Stefan | see description in data abstract | |
| 78 | Psectrocladius sordidellus-type | P.sordidellus-T | # | Engels, Stefan | see description in data abstract | |
| 79 | Psectrocladius flavus-type | P. flavus-T | # | Engels, Stefan | see description in data abstract | |
| 80 | Psectrocladius calcaratus-type | P. calcaratus-T | # | Engels, Stefan | see description in data abstract | |
| 81 | Pseudorthocladius | Pseudorthocladius | # | Engels, Stefan | see description in data abstract | |
| 82 | Pseudosmittia | Pseudosmittia | # | Engels, Stefan | see description in data abstract | |
| 83 | Rheocricotopus effusus-type | R. effusus-T | # | Engels, Stefan | see description in data abstract | |
| 84 | Smittia | Smittia | # | Engels, Stefan | see description in data abstract | |
| 85 | Stempellina-type | Stempellina-T | # | Engels, Stefan | see description in data abstract | |
| 86 | Stempellinella - Zavrelia | Stempellinella - Zavrelia | # | Engels, Stefan | see description in data abstract | |
| 87 | Stictochironomus rosenschoeldi-type | S. rosenschoeldi-T | # | Engels, Stefan | see description in data abstract | |
| 88 | Stictochironomus-type A | Stictochironomus-T A | # | Engels, Stefan | see description in data abstract | |
| 89 | Stilocladius | Stilocladius | # | Engels, Stefan | see description in data abstract | |
| 90 | Symposiocladius | Symposiocladius | # | Engels, Stefan | see description in data abstract | |
| 91 | Synorthocladius | Synorthocladius | # | Engels, Stefan | see description in data abstract | |
| 92 | Tanytarsus chinyensis-type | T. chinyensis-T | # | Engels, Stefan | see description in data abstract | |
| 93 | Tanytarsus pallidicornis-type | T. pallidicornis-T | # | Engels, Stefan | see description in data abstract | |
| 94 | Tanytarsus pallidicornis-type | T. pallidicornis-T | # | Engels, Stefan | see description in data abstract | |
| 95 | Tanytarsus nemorosus-type | T. nemorosu-T | # | Engels, Stefan | see description in data abstract | |
| 96 | Tanytarsus lugens-type | T. lugens-T | # | Engels, Stefan | see description in data abstract | |
| 97 | Tanytarsus mendax-type | T. mendax-T | # | Engels, Stefan | see description in data abstract | |
| 98 | Thienemanniella clavicornis-type | T. clavicornis-T | # | Engels, Stefan | see description in data abstract | |
| 99 | Thienemannimyia | Thienemannimyia | # | Engels, Stefan | see description in data abstract | |
| 100 | Sergentia coracina-type | S. coracina-T | # | Engels, Stefan | see description in data abstract | |
| 101 | Tribelos | Tribelos | # | Engels, Stefan | see description in data abstract | |
| 102 | Tvetenia | Tvetenia | # | Engels, Stefan | see description in data abstract | |
| 103 | Zalutschia-type A | Zalutschia-T A | # | Engels, Stefan | see description in data abstract | |
| 104 | Zalutschia-type B | Zalutschia-T B | # | Engels, Stefan | see description in data abstract | |
| 105 | Zavrelimyia | Zavrelimyia | # | Engels, Stefan | see description in data abstract | |
| 106 | Chironomini 1st instar | Chironomini 1st instar | # | Engels, Stefan | see description in data abstract | |
| 107 | Orthocladiinae spp. | Orthocladiinae spp. | # | Engels, Stefan | see description in data abstract | |
| 108 | Tanypodini spp. | Tanypodini spp. | # | Engels, Stefan | see description in data abstract | |
| 109 | Tanytarsini spp. | Tanytarsini spp. | # | Engels, Stefan | see description in data abstract | |
| 110 | Unidentified | Unident | # | Engels, Stefan | see description in data abstract |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
5122 data points
Download Data
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