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Zooplankton and micronekton respond to climate fluctuations in the Amundsen Sea polynya, Antarctica.

Abstract：

:The vertical migration of zooplankton and micronekton (hereafter 'zooplankton') has ramifications throughout the food web. Here, we present the first evidence that climate fluctuations affect the vertical migration of zooplankton in the Southern Ocean, based on multi-year acoustic backscatter data from one of the deep troughs in the Amundsen Sea, Antarctica. High net primary productivity (NPP) and the annual variation in seasonal ice cover make the Amundsen Sea coastal polynya an ideal site in which to examine how zooplankton behavior responds to climate fluctuations. Our observations show that the timing of the seasonal vertical migration and abundance of zooplankton in the seasonally varying sea ice is correlated with the Southern Annular Mode (SAM) and El Niño Southern Oscillation (ENSO). Zooplankton in this region migrate seasonally and overwinter at depth, returning to the surface in spring. During +SAM/La Niña periods, the at-depth overwintering period is shorter compared to -SAM/El Niño periods, and return to the surface layers starts earlier in the year. These differences may result from the higher sea ice cover and decreased NPP during +SAM/La Niña periods. This observation points to a new link between global climate fluctuations and the polar marine food web.

journal_name

Sci Rep

journal_title

Scientific reports

authors

La HS,Park K,Wåhlin A,Arrigo KR,Kim DS,Yang EJ,Atkinson A,Fielding S,Im J,Kim TW,Shin HC,Lee S,Ha HK

doi

10.1038/s41598-019-46423-1

subject

Has Abstract

pub_date

2019-07-12 00:00:00

pages

10087

issue

1

issn

2045-2322

pii

10.1038/s41598-019-46423-1

journal_volume

9

pub_type

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