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Marine Ecology Progress Series

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MEPS 592:283-289 (2018)  -  DOI:

Further evidence of diel vertical migration of copepods under Arctic sea ice during summer

Hyoung Sul La1,*, Koji Shimada2, Eun Jin Yang1, Kyoung-Ho Cho1, Sun-Yong Ha1, Jinyoung Jung1, Jun-Oh Min3, Sung-Ho Kang1, Ho Kyung Ha

1Korea Polar Research Institute, Incheon 21990, Korea
2Tokyo University of Marine Science and Technology, Tokyo 108-0075, Japan
3Hanyang University, Ansan 15588, Korea
4Inha University, Incheon 22212, Korea
*Corresponding author:

ABSTRACT: We examined diel vertical variability of acoustic backscatter under sea ice during the midnight sun season at high latitude in the Canada Basin of the Arctic Ocean. Acoustic backscatter demonstrated that the dominant Arctic copepods (Calanus hyperboreus) consistently performed a distinct diel vertical migration (DVM) synchronized with the solar radiation cycle. DVM was mainly observed between 2 distinctive pycnocline layers at 25 and 45 m above the subsurface chlorophyll maximum (SCM) within Pacific summer water. Picophytoplankton (<2 µm) were mainly distributed within the SCM layer, whereas diatoms (>20 µm) were above the SCM layer. This indicated that light variation is a potential trigger for the DVM of Arctic copepods under sea ice, whereas the vertical depth of occurrence was primarily controlled by water mass stratification and food. This vertical behavior is significant to understanding how Arctic copepods adjust to their habitats relative to sea ice, water masses, and food sources in the dynamic environmental changes in the Arctic Ocean.

KEY WORDS: Arctic copepod · Diel vertical migration · Pycnocline · Subsurface chlorophyll maximum · Acoustic Doppler current profiler

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Cite this article as: La HS, Shimada K, Yang EJ, Cho KH and others (2018) Further evidence of diel vertical migration of copepods under Arctic sea ice during summer. Mar Ecol Prog Ser 592:283-289.

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