Thomas, Ellen; Gooday, Andrew J (1996): Benthic foraminifera and phytodetritus species in sediments from DSDP Leg 85, and ODP Legs 113 and 143 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.712704, Supplement to: Thomas, E; Gooday, AJ (1996): Cenozoic deep-sea benthic foraminifers: Tracers for changes in oceanic productivity? Geology, 24(4), 355-358, https://doi.org/10.1130/0091-7613(1996)024%3C0355:CDSBFT%3E2.3.CO;2
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Abstract:
From late middle Eocene through earliest Oligocene, high-latitude regions cooled, and by the end of the period, continental ice sheets existed in Antarctica. Diversity of planktonic microorganisms declined, and modern groups of terrestrial vertebrates originated. Coeval faunal changes in deep-sea benthic foraminifers have been related to cooling of deep waters and increased oxygenation. Cooling, however, occurred globally, whereas species richness declined at high latitudes and not in the tropics. The late Eocene and younger lower-diversity, high-latitude faunas typically contain common Epistominella exigua and Alabaminella weddellensis, opportunistic phytodetritus-exploiting species that indicate a seasonally fluctuating input of organic matter to the sea floor. We speculate that the species-richness gradient and increase in abundance of phytodetritus-exploiting species resulted largely from the onset of a more unpredictable and seasonally fluctuating food supply, especially at high latitudes.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -21.306033 * Median Longitude: -88.377937 * South-bound Latitude: -65.160667 * West-bound Longitude: -179.555000 * North-bound Latitude: 18.440300 * East-bound Longitude: 3.100150
Date/Time Start: 1982-04-02T00:00:00 * Date/Time End: 1992-04-04T00:00:00
Event(s):
85-573 * Latitude: 0.498500 * Longitude: -133.309500 * Date/Time: 1982-04-02T00:00:00 * Elevation: -4301.0 m * Penetration: 158.6 m * Recovery: 159 m * Location: North Pacific/TROUGH * Campaign: Leg85 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 158.6 m cored; 0 m drilled; 100.6 % recovery
85-574 * Latitude: 4.208700 * Longitude: -133.330200 * Date/Time: 1982-04-11T00:00:00 * Elevation: -4561.0 m * Penetration: 206.5 m * Recovery: 208.2 m * Location: North Pacific/TROUGH * Campaign: Leg85 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 31 cores; 206.5 m cored; 0 m drilled; 100.8 % recovery
85-575 * Latitude: 5.850000 * Longitude: -135.036000 * Date/Time: 1982-04-21T00:00:00 * Elevation: -4536.0 m * Penetration: 98.6 m * Recovery: 99.4 m * Location: North Pacific/FLANK * Campaign: Leg85 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 cores; 98.6 m cored; 0 m drilled; 100.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets
Download Data
Datasets listed in this publication series
- Thomas, E; Gooday, AJ (1996): Benthic foraminifera and phytodetritus species in sediments from DSDP Site 85-573. https://doi.org/10.1594/PANGAEA.712702
- Thomas, E; Gooday, AJ (1996): Benthic foraminifera and phytodetritus species in sediments from DSDP Site 85-574. https://doi.org/10.1594/PANGAEA.712703
- Thomas, E; Gooday, AJ (1996): Benthic foraminifera and phytodetritus species in sediments from ODP Site 113-689. https://doi.org/10.1594/PANGAEA.712699
- Thomas, E; Gooday, AJ (1996): Benthic foraminifera and phytodetritus species in sediments from ODP Site 113-690. https://doi.org/10.1594/PANGAEA.712700
- Thomas, E; Gooday, AJ (1996): Benthic foraminifera and phytodetritus species in sediments from ODP Site 143-865. https://doi.org/10.1594/PANGAEA.712701