Advertisement

Chinese Science Bulletin

, Volume 46, Supplement 1, pp 116–119 | Cite as

Characteristics ofUvigerina in the Northwestern Indian Ocean: Paleo-environmental implications

  • Xiaodong Zhu
Article
  • 20 Downloads

Abstract

Coretop sediment samples covering water depth from 247 to 1474 m in the Northwestern Indian Ocean were analyzed. 6 species ofUvigerina among 77 species and 11 species-complexes were found in all 26 samples. They areUvigerina auberiana d’Orbigny,Uvigerina hispida Schwager,Uvigerina peregrina Cushman,Uvigerina proboscidea Schwager,Uvigerina spinicostata Cushman and Jarvis, andUvigerina sp. Characteristics ofUvigerina are (1) high abundance due to rich food supply and less competitors; (2) low diversity because only those eurytopic / opportunistic forms can survive environment of low dissolved oxygen value; (3) various test shapes and ornamentations which are controlled by respiration or gas exchange of the cell; and (4) abundance ofUvigerina is well related with environmental factors such as water depth, oxygen content and productivity or food supply. TheseUvigerina species can be used as paleo-environmental proxy of low oxygen and rich organic matter supply related to high-surface productivity upwelling caused by Indian monsoons. Analysis ofUvigerina in Hole 723B of ODP Leg 117 showed that upwelling was intensified 9, 18, 50, 100, 200, 240, 340, 440, 480, 600 and 700 ka ago, which implies the increasing in global changes effect from the uplift of the Tibetan Plateau.

Keywords

foraminifera dissolved oxygen test ornamentations 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Wang, P., Deformation of Asia and global cooling: searching links between climate and tectonics, Quaternary Sciences (in Chinese with English abstract), 1998, 3: 213.Google Scholar
  2. 2.
    Wang, P., Response of western Pacific marginal seas to glacial cycles: paleoceanographic and sedimentological features, Marine Geology, 1997, 156: 5.CrossRefGoogle Scholar
  3. 3.
    Prell, W. L., Niitsuma, N. et al. Proceedings of the Ocean Drilling Program, Scientific Results, 117: 1991, College Station, TX (Ocean Drilling Program).Google Scholar
  4. 4.
    Benhard, J. M., Experimental and field evidence of Antarctic foraminiferal tolerance to anoxia and hydrogen sulfide, Mar. Micropaleontology, 1993, 20: 203.CrossRefGoogle Scholar
  5. 5.
    Bian, Y., Wang, L., Wang, P., Benthic foraminifera as indicator of oxygen content and paleoproductivity: A Late Quaternary example from the northern slope of the South China Sea, in Contributions to Late Quaternary Paleoceanography of the South China Sea (eds. Ye, Z., Wang, P.) (in Chinese with English abstract), Qingdao: Qingdao Ocean University Press, 1992, 227.Google Scholar
  6. 6.
    Jian, Z., Zheng, L., Benthic foraminifera in surface sediments and the deeper water masses of the central South China Sea, in Contributions to Late Quaternary Paleoceanography of the South China Sea (eds. Ye, Z., Wang, P.) (in Chinese with English abstract), Qingdao: Qingdao Ocean University Press, 1992, 119.Google Scholar
  7. 7.
    Jian, Z., Wang, L. Late Quaternary benthic foraminifera and deep-water paleoceanography in the South China Sea, Marine Geology, 1997, 32: 127.Google Scholar
  8. 8.
    Gupta, A. K., Srinivasan, M. S., Uviggerina proboscidea abundances and paleoceanography of the northern Indian Ocean DSDP Site 214 during the Late Neogene. Mar., Micropaleontol., 1992, 19: 355.CrossRefGoogle Scholar
  9. 9.
    Jian, Z., Chen, R. et al., Deep-sea benthic foraminiferal record of the paleoceanography in the southern Okinawa Trough over the last 20,000 years, Science in China, Ser. D, 1996, 39 (5): 551.Google Scholar
  10. 10.
    Wang, P., Western Pacific in glacial cycle: Seasonality in marginal sea and varialilities of Warm Poo, Science in China, Ser. D, 1998, 41(1): 35.CrossRefGoogle Scholar

Copyright information

© Science in China Press 2001

Authors and Affiliations

  1. 1.Department of Geo and Ocean SciencesNanjing UniversityNanjingChina

Personalised recommendations