Rodrigues, Érika do Socorro Ferreira; Yao, Qiang (2025): Relative abundance of diatoms in a sediment core from Lake Pacú, lower Negro River, Central Amazonia, during the mid- to late Holocene [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.981676
Always quote citation above when using data! You can download the citation in several formats below.
Published: 2025-07-17 • DOI registered: 2025-07-17
Abstract:
This dataset contains the relative abundance of diatom taxa identified in 68 sediment samples collected at 0.10 m intervals from core NGR07, from Lake Pacú, in the lower Negro River region of the Central Amazonia. The diatom assemblages were analyzed to reconstruct changes in aquatic conditions associated with flood pulse oscillations during the mid- to late Holocene. Approximately 500 valves were counted per sample using light microscopy, and taxa were identified based on microstructural features, supported by regional diatom atlases. The dataset includes both periphytic and planktonic forms, reflecting lake-level variations since the mid-Holocene. Diatom diagrams and zonations were generated using Tilia and CONISS software.
Keyword(s):
Supplement to:
Rodrigues, Érika do Socorro Ferreira; Yao, Qiang; de Oliveira, Paulo Eduardo; Chiessi, Cristiano Mazur; biu Liu, Kam; Bertassoli Junior, Dailson José; Akabane, Thomas K; de Souza Magalhães, Evandro Augusto; de Carvalho, Vitor Araujo; Fang, Shubo (2025): Oscillations in Mid-to Late Holocene Environments of the Lower Negro River, Central Amazonia, Recorded in Pollen and Diatom Assemblages From Lake Pacú Sediments. Paleoceanography and Paleoclimatology, 40(8), e2024PA005069, https://doi.org/10.1029/2024PA005069
References:
Rodrigues, Érika do Socorro Ferreira; biu Liu, Kam; de Oliveira, Paulo Eduardo; Figueiredo, Beatriz L; Yao, Qiang (2023): Diatom and pollen atlas dataset from the Northern Gulf of Mexico, USA. Data in Brief, 47, 109033, https://doi.org/10.1016/j.dib.2023.109033
Rodrigues, Érika do Socorro Ferreira; Cohen, Marcelo Cancela Lisboa; Figueiredo, Beatriz L; Liu, Kam-biu; Yao, Qiang (2023): Pollen atlas and identification dataset from Santa Catarina, south Brazil. Data in Brief, 46, 108855, https://doi.org/10.1016/j.dib.2022.108855
Funding:
Coverage:
Latitude: -2.550900 * Longitude: -60.921200
Date/Time Start: 2021-11-18T00:00:00 * Date/Time End: 2021-11-18T00:00:00
Minimum DEPTH, sediment/rock: 0.0 m * Maximum DEPTH, sediment/rock: 6.8 m
Event(s):
Comment:
Further method/device information:
Instrument Type: Light microscope, Zeiss, Axiolab 5 with Axiocam 208 color camera (430037-9110-000, Microscopy GmbH).
Preparation Method: Sediment sample volumes were measured using a stainless-steel volume gauge, producing cylindrical pellets of 3 cm³. Each pellet was treated with 30% hydrogen peroxide (H₂O₂) at 50 °C to oxidize organic matter, followed by 10% hydrochloric acid (HCl) to remove carbonates. Lycopodium spore tablets were added for concentration estimation. Samples were washed by repeated decantation with distilled water until reaching neutral pH. Permanent slides were prepared by drying the
material on coverslips and mounting with Entellan®.
Counting Method: At least 500 diatom valves were counted per sample under 1300× magnification. Identification was based on morphological features of the silicified valves, following Rodrigues et al. (2023, doi:10.1016/j.dib.2022.108855 ; 2023 doi:10.1016/j.dib.2023.109033).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Rodrigues, Érika do Socorro Ferreira | Geocode | |
| 2 | Aulacoseira granulata | A. granulata | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 3 | Fragilaria nitzschioides | F. nitzschioides | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 4 | Eunotia emedii | E. emedii | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 5 | Gomphonema archaevibrio | G. archaevibrio | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 6 | Actinella pararobusta | A. pararobusta | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 7 | Aulacoseira gessneri | A. gessneri | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 8 | Pinnularia delicata | P. delicata | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 9 | Eunotia sp. | Eunotia sp. | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 10 | Aulacoseira sp. | Aulacoseira sp. | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 11 | Aulacoseira ambigua | A. ambigua | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 12 | Pinnularia angustivalva | P. angustivalva | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 13 | Fragilaria sp. | Fragilaria sp. | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 14 | Navicula sp. | Navicula sp. | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 15 | Pinnularia monicae | P. monicae | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 16 | Surirella sp. | Surirella sp. | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 17 | Pinnularia procera | P. procera | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 18 | Pinnularia viridiformes | P. viridiformes | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 19 | Pinnularia sp. | Pinnularia sp. | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 20 | Aulacoseira distans | A. distans | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 21 | Placoneis convenius | P. convenius | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 22 | Pinnularia pisciculus | P. pisciculus | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton |
| 23 | Frustulia magna | F. magna | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Group: Periphyton |
| 24 | Eunotia parasiolli | E. parasiolli | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 25 | Fragilaria javanica | F. javanica | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 26 | Eunotia pseudoserra | E. pseudoserra | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 27 | Eunotia souzae | E. souzae | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 28 | Eunotia subrobusta | E. subrobusta | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 29 | Eunotia meridiana | E. meridiana | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 30 | Eunotia inspectabilis | E. inspectabilis | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 31 | Placoneis tersa | P. tersa | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 32 | Placoneis pseudodemerarae | P. pseudodemerarae | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 33 | Neidium neotropicum | N. neotropicum | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 34 | Actinella curvatula | A. curvatula | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 35 | Pinnularia perinstabilis | P. perinstabilis | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 36 | Navicula reichardtiana | N. reichardtiana | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 37 | Actinella sp. | Actinella sp. | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Periphyton |
| 38 | Encyonopsis braunii | E. braunii | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Total diatoms |
| 39 | Phytoplankton, marine | Phytopl mar | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Total diatoms |
| 40 | Periphyton | Periphyton | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton; Periphyton |
| 41 | Sum | Sum | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) | Phytoplankton; Periphyton |
| 42 | Diatoms | Diatoms | % | Rodrigues, Érika do Socorro Ferreira | Relative abundance (counted and calculated) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
2829 data points
Download Data
View dataset as HTML (shows only first 2000 rows)