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Shala, Shyhrete; Helmens, Karin; Engels, Stefan; Kuhry, Peter; Kylander, Malin E; Luoto, Tomi P; Salonen, Sakari; Väliranta, Minna; Weckström, Jan (2025): Chironomid head capsules for the Holocene sediment sequence retrieved from Lake Loitsana, Finland [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.975207

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Published: 2025-02-13DOI registered: 2025-03-14

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Abstract:
This dataset provides counts of chironomid head capsules 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). Two age/depths models are presented: the first model represents the original age/depth model applied to the records (Shala et al., 2014b; 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 chironomid dataset provides information on Holocene lake ecosystem dynamics and was used to quantitatively reconstruct local climate conditions. A total of 71 samples from the Holocene sediment sequence were treated with warm KOH (10%) to de-flocculate the material and subsequently rinsed through a sieve with a 100-µm mesh. 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). A minimum of 50 midge individuals was identified from each sample with the exception of the lowermost two samples of the sequence, where head capsule concentrations were extremely low. All analyses were performed in the laboratories of the University of Helsinki, Finland.
Keyword(s):
Chironomids; C/N; diatoms; Finland; Holocene; Itrax; LOI; Macro-remains; Pollen; Sokli; Stable isotopes
References:
Blaauw, Maarten; Christen, Andrés (2011): Flexible paleoclimate age-depth models using an autoregressive gamma process. Bayesian Analysis, 6(3), 457-474, https://doi.org/10.1214/11-BA618
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
Shala, Shyhrete; Helmens, Karin F; Luoto, Tomi P; Salonen, J Sakari; Väliranta, Minna; Weckström, Jan (2017): Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake. The Holocene, 27(11), 1745-1755, https://doi.org/10.1177/0959683617708442
Shala, Shyhrete; Helmens, Karin F; Luoto, Tomi P; Väliranta, Minna; Weckström, Jan; Salonen, J Sakari; Kuhry, Peter (2014): Evaluating environmental drivers of Holocene changes in water chemistry and aquatic biota composition at Lake Loitsana, NE Finland. Journal of Paleolimnology, https://doi.org/10.1007/s10933-014-9795-1
Funding:
Academy of Finland, grant/award no. 1278692
Academy of Finland, grant/award no. 1310649
Coverage:
Latitude: 67.804722 * Longitude: 29.282222
Date/Time Start: 2008-04-05T10:00:00 * Date/Time End: 2008-04-06T18:00:00
Minimum DEPTH, sediment/rock: 0.010 m * Maximum DEPTH, sediment/rock: 8.880 m
Event(s):
Loitsana_Lake (LL) * Latitude: 67.804722 * Longitude: 29.282222 * Date/Time Start: 2008-04-05T10:00:00 * Date/Time End: 2008-04-06T18:00:00 * Elevation: 214.0 m * Lake water depth: 1-2 m * Method/Device: Russian peat corer (RPC)
Comment:
Further funding was provided by SKB (Swedish Nuclear Fuel and Waste Management Company) and the Bolin Centre for Climate Research.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmGeocode
2Age modelAge modelkaCalculated, according to Shala et al. (2017)Shala
3Age modelAge modelkaCalculated according to Blaauw and Christen (2011)Bacon
4AblabesmyiaAblabesmyia#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
5AcricotopusAcricotopus#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
6ChaetocladiusChaetocladius#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
7Chironomus anthracinus-typeC. anthracinus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
8Chironomus plumosus-typeC. plumosus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
9Cladopelma lateralis-typeC. lateralis-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
10Cladotanytarsus mancus-typeC. mancus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
11ConstempellinaConstempellina#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
12Corynocera ambiguaC. ambigua#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
13Corynocera oliveri-typeC. oliveri-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
14Corynoneura lobata-typeC. lobata-type#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
15Corynoneura arctica-typeC. arctica-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
16Cricotopus intersectus-typeC. intersectus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting mediumCricotopus (I.) intersectus-type
17Cricotopus sylvestris-typeC. sylvestris-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting mediumCricotopus (I.) sylvestris-type
18Cricotopus trifasciatus-typeC. trifasciatus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting mediumCricotopus (I.) trifasciatus-type
19Cricotopus bicinctus-typeC. bicinctus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
20Cricotopus cylindraceus-typeC. cylindraceus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
21Cricotopus-type PCricotopus-T P#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
22Cricotopus indeterminataCricotopus indet#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting mediumundifferentiated
23CryptochironomusCryptochironomus#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
24CryptotendipesCryptotendipes#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
25DemicryptochironomusDemicryptochironomus#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
26Diamesa bertrami-typeD. bertrami-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
27Dicrotendipes nervosus-typeD. nervosus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
28Einfeldia pagana-typeE. pagana-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
29Endochironomus albipennis-typeE. albipennis-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
30Endochironomus impar-typeE. impar-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
31Endochironomus tendens-typeE. tendens-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
32Eukiefferiella claripennis-typeE. claripennis-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
33Eukiefferiella devonica-typeE. devonica-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
34Eukiefferiella fittkaui-typeE. fittkaui-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
35Glyptotendipes barbipes-typeG. barbipes-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
36Glyptotendipes pallens-typeG. pallens-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
37HarnischiaHarnischia#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
38Heterotrissocladius grimshawi-typeH. grimshawi-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
39Heterotrissocladius maeaeri-typeH. maeaeri-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
40Heterotrissocladius marcidus-typeH. marcidus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
41Hydrobaenus johannseni-typeH. johannseni-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
42Hydrobaenus lugubris-typeH. lugubris-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
43KrenosmittiaKrenosmittia#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
44LimnophyesLimnophyes#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
45MesocricotopusMesocricotopus#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
46Micropsectra contracta-typeM. contracta-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
47Micropsectra insignilobus-typeM. insignilobus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
48Micropsectra pallidula-typeM. pallidula-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
49Micropsectra radialis-typeM. radialis-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
50Microtendipes pedellus-typeM. pedellus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
51MonodiamesaMonodiamesa#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
52Nanocladius branchicolus-typeN. branchicolus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting mediumNanocladius (P.) branchicolus-type
53Nanocladius rectinervis-typeN. rectinervis-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
54Orthocladius sp.Orthocladius sp.#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting mediumOrthocladius (E.) sp.
55Orthocladius consobrinus-typeO. consobrinus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
56Orthocladius oliveri-typeO. oliveri-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
57Orthocladius trigonolabris-typeO. trigonolabris-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
58Orthocladius-type IOrthocladius-T I#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
59PagastiellaPagastiella#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
60Parachironomus varus-typeP. varus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
61ParacladiusParacladius#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
62ParacricotopusParacricotopus#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
63Parakiefferiella bathophila-typeP. bathophila-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
64Parakiefferiella triquetra-typeP. triquetra-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
65ParaphaenocladiusParaphaenocladius#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
66Paratanytarsus indeterminataParatanytarsus indet#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting mediumundifferentiated
67Paratanytarsus austriacus-typeP. austriacus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
68Paratanytarsus penicillatus-typeP. penicillatus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
69Paratendipes albimanus-typeP. albimannus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
70Polypedilum nubeculosum-typeP. nubeculosum-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
71ProcladiusProcladius#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
72Propsilocerus-type NPropsilocerus-T N#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
73ProtanypusProtanypus#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
74Psectrocladius flavus-typeP. flavus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
75Psectrocladius septentrionalis-typeP. septentrionalis-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
76Psectrocladius calcaratus-typeP. calcaratus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
77Psectrocladius sordidellus-typeP.sordidellus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
78PseudochironomusPseudochironomus#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
79PseudosmittiaPseudosmittia#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
80Rheocricotopus chalybeatus-typeR. chalybeatus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
81Rheocricotopus effusus-typeR. effusus-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
82Rheocricotopus fuscipes-typeR. fuscipes-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
83RheotanytarsusRheotanytarsus#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
84Sergentia coracina-typeS. coracina-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
85Smittia foliacea-typeS. foliacea-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
86StempellinaStempellina#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
87StempellinellaStempellinella#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
88Stictochironomus rosenschoeldi-typeS. rosenschoeldi-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
89SymposiocladiusSymposiocladius#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
90SynorthocladiusSynorthocladius#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
91Tanytarsus chinyensis-typeT. chinyensis-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
92Tanytarsus glabrescens-typeT. glabrescens-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
93Tanytarsus lactescens-typeT. lactescens-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
94Tanytarsus lugens-typeT. lugens-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
95Tanytarsus mendax-typeT. mendax-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
96Tanytarsus pallidicornis-typeT. pallidicornis-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
97Tanytarsus indeterminataTanytarsus indet#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting mediumundifferentiated
98Thienemanniella indeterminataThienemanniella indet#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting mediumundifferentiated
99Thienemannimyia-typeThienemannimyia-T#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
100TribelosTribelos#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
101UnidentifiedUnident#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
102Zalutschia-type AZalutschia-T A#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
103Zalutschia-type BZalutschia-T B#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
104Zalutschia zalutschicolaZ. zalutschicola#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
105ZavrelimyiaZavrelimyia#Engels, StefanWet sieved (100 µm) followed by hand picking from Bogorov sorting tray, mounted on permanent microscope slides, Euparal mounting medium
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7374 data points

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