Ramos-Oliveira, Ana Beatriz; Evangelista, Heitor; Corrêa, Caio Cezar Dias; Prado, Luciana Figueiredo; Keidel, Isadora; Licínio, Marcus Vinicius; Tavares, Flavia Alves; Oaquim, Anna Beatriz Jones (2026): Chironomidae subfossil record from a sediment core of the Anthropocene reveals potential as a paleoclimatic proxy at a Brazilian Tropical Coast site [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.988423
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Published: 2026-01-26 • DOI registered: 2026-02-24
Abstract:
This dataset presents sedimentological, geochemical, and subfossil Chironomidae data from a mangrove core collected at Ilha Grande, Rio de Janeiro State, southeastern Brazil (approx. 23°S, 44°W). The record includes head capsule counts of Chironomidae separated into three size fractions (>250 µm, 250–88 µm, and 88–74 µm), along with sediment density, chronological information, and concentrations of major and trace elements (e.g., Al, Fe, Mn, Pb, Zn, Ti, Si, P, S, and others). Linear and power-based air temperature reconstructions (°C) were derived from Chironomidae assemblages using transfer functions developed for tropical regions. The core was sampled in 2023 and dated using combined ²¹⁰Pb analyses with CRS model, covering approximately the last 170 years (1860–2024 CE). Sediment slices of 1 cm were analyzed for biological and geochemical parameters to assess recent environmental and climatic variability in tropical coastal ecosystems. Chironomidae head capsules were extracted using standard subfossil preparation protocols, mounted under optical microscopy, and identified to morphotype level following Walker (2001) and Brooks et al. (2007) with aditional personal modifications. Elemental concentrations were determined via X-ray fluorescence (XRF) spectroscopy, and total density was measured gravimetrically.
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
Walker, Ian R (2001): Midges: Chironomidae and Related Diptera. In: Smol, JP, Birks, HJB, Last, WM (eds.), Tracking Environmental Change Using Lake Sediments, Developments in Paleoenvironmental Research, 4, Springer Netherlands, Dordrecht, 43-66, https://doi.org/10.1007/0-306-47671-1_3
Coverage:
Latitude: -23.121500 * Longitude: -44.258000
Date/Time Start: 2023-10-17T14:30:00 * Date/Time End: 2023-10-17T14:30:00
Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 0.30 m
Event(s):
CEADS03_Core_01 * Latitude: -23.121500 * Longitude: -44.258000 * Date/Time: 2023-10-17T14:30:00 * Elevation: 0.0 m * Method/Device: PVC corer (PVCcorer) * Comment: Core collected from mangrove sediment at Ilha Grande island, Rio de Janeiro, Brazil. Subsamples used for subfossil Chironomidae analysis, geochemistry and radiometric dating (Pb-210)
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
891 data points