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Individual valve counts of diatoms in sediment core Haem13 from lake Hämelsee

Description: This dataset provides counts of diatom valves for the Lateglacial sediment sequence retrieved from Lake Hämelsee (Germany) in 2013. Counts per taxon are presented against both depth (m) and age (cal yr. BP). The diatom data provides information on Lateglacial ecosystem dynamics and the dataset was used to interpret changes in aquatic diversity as well as in palaeolimnological conditions. A total of 78 samples were selected for diatom analysis using 2-5 cm sample intervals throughout the Lateglacial section of the core sequence, with a higher sampling resolution (1 cm intervals) around key transitions. Organic matter was removed from the samples (ca. 0.01 grams dried sediment) by oxidation using 5 ml of H2O2 (30%) and heating in a water bath at 70 °C for 24-28 hrs. Subsequently, a few drops of HCl (50%) were added to remove residual H2O2 and carbonates. Samples were washed by adding distilled water, shaking vigorously, centrifuging at 1200 rpm for 4 minutes, and removing the liquid using a pipette. This process was repeated 5 times, and a few drops of ammonia (NH3) were added to the solution prior to the final wash to prevent clumping of diatoms. Diatom slides were mounted using Naphrax and diatoms were identified using Krammer and Lange-Bertalot (1986–1991) and Camburn and Charles (2000). For several samples the target count sum of 300 diatom valves could not be reached due to low concentrations or poor diatom preservation. Prior to analysis and interpretation, and where possible, neighbouring samples with a low count sum were amalgamated until a count of at least 100 valves was reached; if this was not possible the samples were deleted from our dataset prior to subsequent analysis (note that these samples are still included in the dataset provided here). All analyses were performed in the laboratories of University College London, UK.

Global identifier:

Doi(
    "10.1594/PANGAEA.964521",
)

Types:
Measurements {
    domain: Unspecified,
    station: None,
    measured_variables: [
        "ORDINAL NUMBER",
        "DEPTH, sediment/rock",
        "AGE",
        "Lindavia bodanica",
        "Pantocsekiella delicatula",
        "Diatoms, centrales indeterminata",
        "Discotella stelligera",
        "Pantocsekiella ocellata",
        "Cocconeis sp.",
        "Cocconeis sp.",
        "Cocconeis neodiminuta",
        "Cocconeis sp.",
        "Cocconeis placentula",
        "Asterionella formosa",
        "Nepula vitiosa",
        "Nitzschia lacuum",
        "Nitzschia gracilis",
        "Nitzschia sp.",
        "Nitzschia sp.",
        "Nitzschia dissipata",
        "Nitzschia obtusa var. brevissima",
        "Fragilaria sp.",
        "Fragilariforma lata",
        "Staurosirella pinnata var. minutissima",
        "Fragilariforma constricta",
        "Staurosira construens",
        "Pseudostaurosira brevistriata",
        "Staurosirella pinnata var. intercedens",
        "Staurosirella pinnata var. acuminata",
        "Fragilaria recapitellata",
        "Staurosirella pinnata",
        "Pleurosigma sp.",
        "Stauroforma exiguiformis",
        "Diatoma sp.",
        "Navicula radiosa",
        "Navicula exilis",
        "Navicula sp.",
        "Cavinula cocconeiformis",
        "Navicula sp.",
        "Navicula sp.",
        "Khursevichia jentzschii",
        "Navicula lanceolata",
        "Placoneis elginensis",
        "Nupela tenuicephala",
        "Sellaphora pupula",
        "Navicula sp.",
        "Navicula cincta",
        "Navicula sp.",
        "Fallacia pygmaea",
        "Navicula sp.",
        "Fragilaria sp.",
        "Tabellaria sp.",
        "Tabellaria flocculosa",
        "Tabellaria fenestrata",
        "Tabellaria quadriseptata",
        "Aulacoseira sp.",
        "Eunotia curvata",
        "Eunotia flexuosa",
        "Eunotia rhomboidea",
        "Eunotia sp.",
        "Eunotia sp.",
        "Denticula kuetzingii",
        "Denticula sp.",
        "Denticula tenuis",
        "Encyonema minutum",
        "Cymbella parva",
        "Encyonema silesiacum",
        "Cymbella sp.",
        "Cymbella sp.",
        "Achnanthes sp.",
        "Platessa conspicua",
        "Psammothidium helveticum",
        "Gogorevia exilis",
        "Epithemia sorex",
        "Epithemia adnata",
        "Epithemia gibba",
        "Epithemia turgida",
        "Epithemia sp.",
        "Stauroneis anceps",
        "Stauroneis construens",
        "Stauroneis sp.",
        "Meridion circulare",
        "Diploneis sp.",
        "Amphora subconstricta",
        "Halamphora thumensis",
        "Amphora pediculus",
        "Amphora copulata",
        "Amphora ovalis",
        "Gomphonema parvulum",
        "Gomphonema sp.",
        "Gomphonema sp.",
        "Gomphonema clevei",
        "Gomphonema brebissonii",
        "Planothidium joursacense",
        "Pseudostaurosira spp.",
        "Pseudostaurosira robusta",
        "Placoneis gastrum",
    ],
    methods: [
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
        "Counting valves",
    ],
}
Dataset

Origins: /Wissenschaft/PANGAEA

Tags: Alkan ? Ammoniak ? Seen ? Diatomeen ? Bundesrepublik Deutschland ? Organisches Material ? Daten ? Wasserprobe ? Sediment ? Ökosystemzustand ? Heizung ? Rückstand ? Biodiversität ? Chironomidae ? GDGTs ? Haemelsee ? LOI ? Pediastrum ? XRF ? deuterium ? ecosystem dynamics ?

Region: Federal Republic of Germany

Bounding boxes: 9.316667° .. 9.316667° x 52.766667° .. 52.766667° 10.5° .. 10.5° x 51.5° .. 51.5°

License: cc-by/4.0

Language: Englisch/English

Organisations

Persons

Issued: 2024-04-17

Modified: 2024-04-17

Time ranges: 2013-07-08 - 2013-07-12

Resources

Status

Quality score

Accessed 1 times.