Mass Occurrence of Pacific Copepods in the Southern Chukchi Sea During Summer: Implications of the High-Temperature Bering Summer Water

The Bering Strait is the only gateway to the Chukchi Sea from the Pacific Ocean and is a major route of Pacific water inflow. We recently investigated the occurrence of Pacific copepod species along with the warming of the Chukchi Sea and sought to identify the cause of the mass occurrence these cop...

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Bibliographic Details
Published in:Frontiers in Marine Science 2020-07, Vol.7
Main Authors: Kim, Jee-Hoon, Cho, Kyoung-Ho, La, Hyoung Sul, Choy, Eun Jung, Matsuno, Kohei, Kang, Sung-Ho, Kim, Won, Yang, Eun Jin
Format: Article
Language:English
Subjects:
Abundance
Aquatic crustaceans
Arctic
Bering Summer Water
Chukchi Sea
Coastal waters
CTD observations
Data collection
High temperature
Inflow
Mass
mass occurrence
Mooring systems
Pacific copepod
Plankton
Salinity
Salinity data
Species
Straits
Summer
Water
Water depth
Water inflow
Water masses
Water temperature
Zooplankton
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Summary:The Bering Strait is the only gateway to the Chukchi Sea from the Pacific Ocean and is a major route of Pacific water inflow. We recently investigated the occurrence of Pacific copepod species along with the warming of the Chukchi Sea and sought to identify the cause of the mass occurrence these copepods through an analysis of the water masses flowing through the Bering Strait. Zooplankton and Conductivity-Temperature-Depth (CTD) data collection was conducted in the Chukchi Sea and Bering Strait from 2014 to 2016. In addition, mooring systems installed in the Bering Strait were analyzed to obtain water temperature and salinity data during summer to understand the properties of the water masses. In 2015, a high abundance of Pacific copepod species (Eucalanus bungii, Metridia pacifica, and Neocalanus spp.) was observed in Bering Summer Water (BSW), which was relatively warm compared to measurements obtained from 2014 and 2016. As further confirmation, our results were consistent with 2007, 2009, and 2012 data, which showed that the abundance of Pacific copepod species was proportional to the temperature of the BSW entering the Chukchi Sea. In conclusion, we reconfirmed that Pacific copepod species are entering the Chukchi Sea along with BSW, and we newly discovered that their high abundance coincides with the relatively warm BSW, not Alaskan Coastal Water (ACW). These findings suggest that the inflow of the high-temperature BSW (>3°C) plays an important role in the mass occurrence of Pacific copepod species in the southern Chukchi Sea
ISSN:2296-7745
2296-7745
DOI:10.3389/fmars.2020.00612