(Table 2) Planktic foraminifera and their diversity indices of sediment surface samples from the Atlantic Ocean
CitationAl-Sabouni N, Kucera M, Schmidt D N (2007). (Table 2) Planktic foraminifera and their diversity indices of sediment surface samples from the Atlantic Ocean. PANGAEA - Data Publisher for Earth & Environmental Science. Occurrence dataset https://doi.org/10.1594/pangaea.672305 accessed via GBIF.org on 2023-11-30.
DescriptionSpecies distribution patterns in planktonic foraminiferal assemblages are fundamental to the understanding of the determinants of their ecology. Until now, data used to identify such distribution patterns was mainly acquired using the standard >150 µm sieve size. However, given that assemblage shell size-range in planktonic foraminifera is not constant, this data acquisition practice could introduce artefacts in the distributional data. Here, we investigated the link between assemblage shell size-range and diversity in Recent planktonic foraminifera by analysing multiple sieve-size fractions in 12 samples spanning all bioprovinces of the Atlantic Ocean. Using five diversity indices covering various aspects of community structure, we found that counts from the >63 µm fraction in polar oceans and the >125 µm elsewhere sufficiently approximate maximum diversity in all Recent assemblages. Diversity values based on counts from the >150 µm fraction significantly underestimate maximum diversity in the polar and surprisingly also in the tropical provinces. Although the new methodology changes the shape of the diversity/sea-surface temperature (SST) relationship, its strength appears unaffected. Our analysis reveals that increasing diversity in planktonic foraminiferal assemblages is coupled with a progressive addition of larger species that have distinct, offset shell-size distributions. Thus, the previously documented increase in overall assemblage shell size-range towards lower latitudes is linked to an expanding shell-size disparity between species from the same locality. This observation supports the idea that diversity and shell size-range disparity in foraminiferal assemblages are the result of niche separation. Increasing SST leads to enhanced surface water stratification and results in vertical niche separation, which permits ecological specialisation. Specific deviations from the overall diversity and shell-size disparity latitudinal pattern are seen in regions of surface-water instability, indicating that coupled shell-size and diversity measurements could be used to reconstruct water column structures of past oceans.
Event: 154-926A, South Atlantic Ocean ; Event: GeoB1206-1, Walvis Ridge ; Event: GeoB1726-1, Namibia continental slope ; Event: GeoB3915-1, Northeast Brasilian Margin ; Event: GeoB5142-1, Brazil Basin ; Event: GIK10737-1, Atlantic Ocean ; Event: LO-09-23LBC, South Atlantic Ocean ; Event: M35005-4, ; Event: MC575, South Atlantic Ocean ; Event: PS1293-3, Fram Strait http://en.wikipedia.org/wiki/Fram_Strait ; Event: PS1901-1, Greenland Sea ; Event: PS2498-2, South Atlantic ;
Daniela N Schmidt
PANGAEA - Data Publisher for Earth & Environmental Science
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