Between-year comparison of interactions between environmental parameters and various plankton stocks in the northern Bering Sea during the summers of 2017 and 2018

Yamaguchi, Atsushi; Kimura, Fumihiko; Fukai, Yuri; Abe, Yoshiyuki; Matsuno, Kohei; Ooki, Atsushi; Hirawake, Toru

doi:10.1016/j.polar.2020.100555

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…In the Bering Sea, the dominance of low-lipid (i.e., low nutrition) zooplankton has decreased the survival rate of pollock in winter regardless of zooplankton abundance (Heintz et al, 2013). Recent studies linked a lack of interaction between the members of the plankton food web during 2018 with a decrease in energy and material transfer efficiency (Yamaguchi et al, 2021), resulting in a substantial decrease in jellyfish populations in 2018 (Maekakuchi et al, 2020). Therefore, even if zooplankton abundance and production are higher, the dominance of small-sized and lownutrition zooplankton adversely affects the higher trophic levels in the northern Bering Sea (Springer et al, 1989).…”

Section: Ecological Impacts Of Changing Zooplankton Communitiesmentioning

confidence: 99%

Effects of Early Sea-Ice Reduction on Zooplankton and Copepod Population Structure in the Northern Bering Sea During the Summers of 2017 and 2018

et al. 2022

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A remarkable early sea-ice reduction event was observed in the northern Bering Sea during 2018. In turn, this unusual hydrographic phenomenon affected several marine trophic levels, resulting in delayed phytoplankton blooms, phytoplankton community changes, and a northward shift of fish stocks. However, the response of the zooplankton community remains uncharacterized. Therefore, our study sought to investigate the zooplankton community shifts in the northern Bering Sea during the summers of 2017 and 2018 and evaluate the effects of early sea-ice melt events on the zooplankton community, population structure of large copepods, and copepod production. Five zooplankton communities were identified based on cluster analysis. Further, annual changes in the zooplankton community were identified in the Chirikov Basin. In 2017, the zooplankton community included abundant Pacific copepods transported by the Anadyr water. In 2018, however, the zooplankton community was dominated by small copepods and younger stages of large copepods (Calanus glacialis/marshallae and Metridia pacifica), which was likely caused by reproduction delays resulting from the early sea-ice reduction event. These environmental abnormalities increased copepod production; however, this higher zooplankton productivity did not efficiently reach the higher trophic levels. Taken together, our findings demonstrated that zooplankton community structure and production are highly sensitive to the environmental changes associated with early sea-ice reduction (e.g., warm temperatures and food availability).

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Section: Ecological Impacts Of Changing Zooplankton Communitiesmentioning

confidence: 99%

Effects of Early Sea-Ice Reduction on Zooplankton and Copepod Population Structure in the Northern Bering Sea During the Summers of 2017 and 2018

et al. 2022

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The northern Bering Sea zooplankton community response to variability in sea ice: evidence from a series of warm and cold periods

Kimmel¹,

Eisner²,

Pinchuk³

2023

Mar. Ecol. Prog. Ser.

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Recent, unprecedented losses of sea ice have resulted in widespread changes in the northern Bering Sea ecosystem, and this study explores the zooplankton community response. Time-series observations were used to identify zooplankton community changes in the northern (>60°N) Bering Sea (NBS) over a 17 yr period (2002-2018). The overall objective was to determine if the changes in zooplankton populations previously described for the southeastern Bering Sea shelf (<60°N) were also observed in the NBS over alternating warm and cold periods. Particular attention was paid to more recent (2014-2018) years that showed significant losses of sea ice in the NBS (2017/2018) in comparison to a prior warm period (2003-2005) and an intervening cold period (2006-2013). A multivariate framework (redundancy analysis) was used to explore correlations with environmental conditions, and differences in mean abundance across the differing warm and cold periods were tested. The NBS zooplankton community had different responses across each warm and cold period, and the primary driver for the differences in response was sea ice. Redundancy analysis demonstrated that the zooplankton community during the second warm period experienced greater variability compared to the prior warm period. The zooplankton community had higher abundances of small copepods and meroplankton and reduced abundances of Calanus spp. and chaetognaths during the most recent warm period. This suggests that the NBS zooplankton will not be impacted by reduced sea ice when the ice coverage extends south of 60°N, but show community change once a minimum threshold in ice extent and timing of retreat is reached. Shifts in the zooplankton community may have had cascading effects on higher trophic levels that were evident during the latter warm period.

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Between-year comparison of interactions between environmental parameters and various plankton stocks in the northern Bering Sea during the summers of 2017 and 2018

Cited by 2 publications

References 29 publications

Effects of Early Sea-Ice Reduction on Zooplankton and Copepod Population Structure in the Northern Bering Sea During the Summers of 2017 and 2018

Effects of Early Sea-Ice Reduction on Zooplankton and Copepod Population Structure in the Northern Bering Sea During the Summers of 2017 and 2018

The northern Bering Sea zooplankton community response to variability in sea ice: evidence from a series of warm and cold periods

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