10.1594/pangaea.55922
https://doi.org/10.1594/PANGAEA.55922
10.15468/5by3sk
Dinoflagellate cysts in western equatorial Atlantic surface sediments
Annemiek Vink
Karin A F Zonneveld
Helmut Willems
PANGAEA - Data Publisher for Earth & Environmental Scienceinfo@pangaea.dehttps://www.pangaea.de
2000-01-01
ENGLISH
In contrast to the wide range of studies carried out in temperate and high-latitude oceanic regions, only a few studies have focused on recent and Holocene organic-walled dinoflagellate cyst assemblages from the tropics. This information is, however, essential for fully understanding the ability of species to adapt to different oceanographic regimes, and ultimately their potential application to local and regional palaeoenvironmental and palaeoceanographic reconstructions. Surface sediment samples of the western equatorial Atlantic Ocean north of Brazil, an area greatly influenced by Amazon River discharge waters, were therefore analysed in detail for their organic-walled dinoflagellate cyst content. A diverse association of 43 taxa was identified, and large differences in cyst distribution were observed. The cyst thanatocoenosis in bottom sediments reflects the seasonal advection of Amazon River discharge water through the Guyana Current and the North Equatorial Countercurrent well into the North Atlantic. To establish potential links between cyst distribution and the environmental conditions of the upper water column, distribution patterns were compared with mean temperature, salinity, density and stratification gradients within the upper water column (0–100 m) over different times of the year, using correspondence analysis and canonical correspondence analysis. The analyses show that differences in these parameters only play a subordinate role in determining species distribution. Instead, nutrient availability, or related factors, dominates the distribution pattern. The only possible indicators of slightly reduced salinities are Trinovantedinium applanatum and Lingulodinium machaerophorum. Four assemblage groups of cyst taxa with similar environmental affinities related to specific water masses/currents can be distinguished and have potential for palaeoenvironmental reconstruction.
This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License.
https://doi.org/10.1594/PANGAEA.55922
Event: GeoB3809-1,
Mid Atlantic Ridge
; Event: GeoB3810-2,
Mid Atlantic Ridge
; Event: GeoB3812-2,
Mid Atlantic Ridge
; Event: GeoB3822-1,
Vema Channel
; Event: GeoB3825-1,
Continental slope off Brazil
; Event: GeoB3826-2,
Continental slope off Brazil
; Event: GeoB3827-1,
Continental slope off Brazil
; Event: GeoB3906-9,
Brazil Basin
; Event: GeoB3908-11,
Equatorial Atlantic
; Event: GeoB3909-1,
Northeast Brasilian Margin
; Event: GeoB3910-3,
Northeast Brasilian Margin
; Event: GeoB3911-1,
Northeast Brasilian Margin
; Event: GeoB3912-2,
Northeast Brasilian Margin
; Event: GeoB3913-2,
Northeast Brasilian Margin
; Event: GeoB3914-3,
Northeast Brasilian Margin
; Event: GeoB3916-1,
Amazon Shelf/Fan
; Event: GeoB3918-1,
Amazon Shelf/Fan
; Event: GeoB3925-2,
Amazon Shelf/Fan
; Event: GeoB3935-1,
Atlantic Caribbean Margin
; Event: GeoB3936-2,
Atlantic Caribbean Margin
; Event: GeoB3937-1,
Atlantic Caribbean Margin
; Event: GeoB3938-2,
Atlantic Caribbean Margin
; Event: GeoB3939-1,
Atlantic Caribbean Margin
; Event: GeoB4306-1,
Midatlantic Ridge
; Event: GeoB4311-1,
Midatlantic Ridge
; Event: GeoB4319-11,
Northern Brasil Basin
; Event: GeoB4401-3,
Ceara Rise
; Event: GeoB4404-2,
Ceara Rise
; Event: GeoB4408-3,
Amazon Fan
; Event: GeoB4412-3,
Ceara Rise
; Event: GeoB4417-5,
Ceara Rise
; Event: GeoB4418-2,
Guayana continental slope
; Event: GeoB4423-3,
Mid Atlantic Ridge
; Event: GeoB4424-2,
Mid Atlantic Ridge
;
-59.388
-16.33
18.195
-31.615
Kingdom
Protozoa
Kingdom
Myzozoa
Frank-Oliver Glöckner
Robert Huber
Geosciences, University of Bremen;
project member ADMINISTRATIVE_POINT_OF_CONTACT
2024-03-29T09:51:16Z
Vink A, Zonneveld K A F, Willems H (2000). Dinoflagellate cysts in western equatorial Atlantic surface sediments. PANGAEA - Data Publisher for Earth & Environmental Science. Occurrence dataset https://doi.org/10.1594/pangaea.55922 accessed via GBIF.org on 2024-03-29.