Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Seasonal Variation of Planktonic Foraminifera Assemblage in response to Seasonal Shift of Inter-Tropical Convergence Zone in the Northeastern Equatorial Pacific

적도수렴대의 위치변화에 따른 북동태평양 적도해역의 부유성 유공충 군집의 계절변동

  • Lee, Yuri (Department of Geology, College of Natural Sciences, Kyungpook National University) ;
  • Asahi, Hirofumi (Korea Polar Research Institute, KIOST) ;
  • Woo, Han Jun (Korean Seas Geosystem Research Center, KIOST) ;
  • Kim, Hyung Jeek (Deep-sea and Seabed Mineral Resources Research Center, KIOST) ;
  • Lee, Seong-Joo (Department of Geology, College of Natural Sciences, Kyungpook National University) ;
  • Khim, Boo-Keun (Department of Oceanography, College of Natural Sciences, Pusan National University)
  • 이유리 (경북대학교 자연과학대학 지질학과) ;
  • ;
  • 우한준 (한국해양과학기술원 관할해역지질연구센터) ;
  • 김형직 (한국해양과학기술원 심해저광물자원연구센터) ;
  • 이성주 (경북대학교 자연과학대학 지질학과) ;
  • 김부근 (부산대학교 자연과학대학 해양학과)
  • Received : 2014.09.30
  • Accepted : 2014.12.05
  • Published : 2014.12.30
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Abstract

A time-series sediment trap was operated at a water depth of 4950 m from July 2003 to May 2004 at KOMO station ($10^{\circ}30^{\prime}N$, $131^{\circ}20^{\prime}W$) in the northeastern equatorial Pacific, with the aim of understanding the temporal variation of planktonic foraminifera assemblages in response to the seasonal shift of Inter-Tropical Convergence Zone (ITCZ). A total of 22130 planktonic foraminifera specimens belonging to 30 species and 11 genera were identified, which shows a distinct seasonal variation with high values (125~288 specimens $m^{-2}day^{-1}$) in the winter to spring (December-May) and low values (16~23 specimens $m^{-2}day^{-1}$) in the fall (September-November). In addition, seasonal ecological differences of foraminifera assemblages are distinctly recognizable: omnivorous foraminifera occurred predominantly during the summer season, whereas herbivorous ones were dominant during the winter season. Such seasonal variations correspond to the seasonal shift of the ITCZ. Enhanced occurrence of herbivorous species during the winter-spring season seems a result of surface water mixing generated by the southward shift of the ITCZ. The increase in omnivorous species during the summer season may be due to the northward movement of the ITCZ caused by weakened wind speed, resulting in the intensification of water column stratification and nutrient-poor environment. A significant reduction of planktonic foraminifera specimens during the fall is attributed to heavy precipitation and reduction in light intensity.

Keywords

References

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