Benthic foraminiferal biodiversity response to changing Arctic palaeoclimate

Four sediment cores recovered from 1000 to 2500 m water depth in the Arctic Ocean, tracing the inflowing Atlantic water from Fram Strait, Yermak Plateau, northern Barents Sea continental slope as far as the Laptev Sea, have been analyzed for species richness and diversity. Samples were wet sieved after freeze-drying using a 63-µm sieve. Where possible at least 300 specimens were counted from the size fraction >63 µm, however, samples from deglacial periods are often affected by carbonate dissolution. In such samples foraminiferal numbers are low. Samples containing less than 40 specimens were excluded from statistical analyses. Because we are aware that specimen numbers <100 specimen are still critical for H analyses, core sections containing less than 100 specimens are highlighted in the figures. Here, we will characterize biodiversity trends by the two most widely used biodiversity measurements, the information function H (Buzas and Gibson, 1969) with its decomposition equation ln(S) and ln(E) (Buzas and Hayek, 1996), and the Fisher Alpha Index (Fisher, Corbett, and Williams, 1943). For spectral analysis the Fisher alpha record of core PS2837-5 was resampled at equally spaced 100-year intervals. For the spectral analysis, two methodes were used within the ANALYSERIES software package (Paillard et al., 1996): 1. The Blackman-Tuckey (1958) for its high confidence of the results; 2. The maximum entropy method (e.g. Haykin, 1983) for its high resolution. The cores reveal well-correlated biodiversity maxima and minima. Distinct periodicities of species richness variability of 1.57 kyr and 0.76 kyr characterize the Late Weichselian, and of 1.16 kyr and 0.54 kyr even more pronounced the Holocene. The biodiversity maxima/minima coincide with terrestrial and marine warm and cool events at high northern latitude. We suggest that either the physiology of most rare species is temperature sensitive, or sustained food supply increased the taxonomic richness during warmer intervals.

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Cite this as

Wollenburg, Jutta Erika, Mackensen, Andreas, Kuhnt, Wolfgang (2007). Dataset: Benthic foraminiferal biodiversity response to changing Arctic palaeoclimate. https://doi.org/10.1594/PANGAEA.527976

DOI retrieved: 2007

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.527976
Author Wollenburg, Jutta Erika
Given Name Jutta Erika
Family Name Wollenburg
More Authors
Mackensen, Andreas
Kuhnt, Wolfgang
Source Creation 2007
Publication Year 2007
Resource Type application/zip - filename: wollenburg-etal_2007
Subject Areas
Name: LandSurface

Name: Lithosphere

Name: Paleontology

Related Identifiers
Title: Benthic foraminiferal biodiversity response to a changing Arctic palaeoclimate in the last 24.000 years
Identifier: https://doi.org/10.1016/j.palaeo.2007.05.007
Type: DOI
Relation: IsSupplementTo
Year: 2007
Source: Palaeogeography, Palaeoclimatology, Palaeoecology
Authors: Wollenburg Jutta Erika , Mackensen Andreas , Kuhnt Wolfgang .