DOI: 10.1016/j.palaeo.2017.02.012
论文题名: Ecology of deep-sea benthic foraminifera in the North Atlantic during the last glaciation: Food or temperature control
作者: Rasmussen T.L. ; Thomsen E.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 472 起始页码: 15
结束页码: 32
语种: 英语
英文关键词: Dansgaard-Oeschger events
; Deep-sea temperature
; Isotope stage 3
; Paleoceanography
; Planktic flux
英文摘要: In this study, we explore the paleoecology of nineteen species and two species-groups of deep-sea benthic foraminifera in relation to bottom water temperature and food supply in the central North Atlantic during the last glaciation, ~ 60,000–28,000 years BP. The study is based on core SO82-02GGC, taken from 1730 m water depth on the western flank of Reykjanes Ridge. The climate of the investigated period was extremely unstable, interrupted by thirteen warmings and coolings, the so-called Dansgaard-Oeschger events. At SO82-02GGC, surface and bottom water temperatures varied with up to 5 °C between the warm interstadials and the cold stadials. Surface productivity, as indicated by the flux of planktic foraminifera, varied with a factor of up to ten. The Dansgaard-Oeschger events had a significant impact on the benthic foraminiferal faunas, which experienced up to 70% replacement between the interstadials and stadials. Multivariate analysis reveals that the investigated species can be separated into two groups. Group 1, including Bulimina costata, Brizalina subspinescens, Epistominella decorata and Trifarina angulosa, was attracted to higher temperatures and high food supply. Group 2, including Pullenia bulloides, Valvulineria laevigata, and Melonis barleeanus, was attracted to colder water and low food supply. Three species belonging to the cold group, Cibicidoides wuellerstorfi, Oridorsalis umbonatus and Eponides tumidulus are almost exclusively confined to sediments rich in ice rafted detritus. A few species including Nonionella iridea and Epistominella vitrea show opportunistic behaviour. Most species are epifaunal to shallow-infaunal and live today in oligotrophic to mesotrophic habitats. Our investigations indicate that temperature was the primary factor responsible for the relative abundance and main grouping of species. However, four species show little influence by temperature and several, perhaps most, were clearly also affected by food supply. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67880
Appears in Collections: 过去全球变化的重建
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作者单位: CAGE-Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT Arctic University of Norway, Tromsø, Norway; Department of Geoscience, University of Aarhus, Aarhus C, Denmark
Recommended Citation:
Rasmussen T.L.,Thomsen E.. Ecology of deep-sea benthic foraminifera in the North Atlantic during the last glaciation: Food or temperature control[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,472