Plankton productivity in the Southwest Pacific; lessons from the past for the future

Author(s): Duncan, Bella; Carter, Lionel; Dunbar, Gavin; Bostock, Helen; Neil, Helen; Hayward, Bruce
Author Affiliation(s): Primary:
Victoria University, Antarctic Research Centre, Wellington, New Zealand
Other:
National Institute of Water and Atmosphere, New Zealand
Geomarine Research, New Zealand
Volume Title: 34th international geological congress; abstracts
Source: International Geological Congress [International Geological Congress, Abstracts = Congrès Géologique International, Résumés, Vol.34, p.778; 34th international geological congress, Brisbane, Queensl., Australia, Aug. 5-10, 2012. Publisher:], [location varies], International CODEN: IGABBY
Note: In English
Summary: A study of Holocene marine sediments suggests the rain rate of coccolithophore (phyto-) and foraminifer (zooplankton) remains to the ocean floor is approximately equal (Broecker and Clark, Paleocoeanography, 2009), implying some sort of ecological equilibrium exists between the two and with prevailing environmental conditions. However, substantial variations in the relative abundance of these forms over long time periods (>103 yrs) have been noted in sediment cores suggesting the Holocene state is not permanent and few have investigated the underlying reasons for these large changes in primary productivity. Two long (250 Ky) records of calcareous plankton production from the southwest Pacific Ocean, north and south of the subtropical front (P71: 33°51.3'S, 174°41.6'E and ODP 1120: 50°3.803'S, 173°22.300'S), show large relative increases in coccolithophore production during marine isotope stage (MIS) 7.3 (210 Ka) at P71 and MIS 5e (125 Ka) at ODP 1120. These two stages represent periods of time with contrasting histories of sea surface temperature, thermocline depth, nutrient availability and irradiance. Using detailed proxy reconstruction of ocean conditions during these stages, we examine the relative importance of these variables for determining the dominant mode of plankton production.
Year of Publication: 2012
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Algae; Campbell Plateau; Cenozoic; Coccolithophoraceae; Coccolithus; Foraminifera; Holocene; Invertebrata; Leg 181; MIS 5; MIS 7; Microfossils; Micropaleontology; ODP Site 1120; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Paleoecology; Paleoenvironment; Plankton; Plantae; Pleistocene; Productivity; Protista; Quaternary; Reconstruction; South Pacific; Southwest Pacific; West Pacific
Coordinates: S500349 S500349 E1732218 E1732218
S335100 S335100 E1744200 E1744200
Record ID: 2015113824
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by International Geological Congress Organizational Committee