Inter-annual variation of the summer zooplankton community in the Chukchi Sea: spatial heterogeneity during a decade of rapid ice decline

Xu, Zhiqiang; Zhang, Guangtao; Sun, Song

doi:10.1007/s00300-018-2324-3

Cited by 13 publications

(10 citation statements)

References 49 publications

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“…In the Chukchi Sea, mesozooplankton communities are affected by water mass, sea ice, phytoplankton, geographic location, and competitive species (Ershova, Hopcroft, Kosobokova, Matsuno et al., 2015; Matsuno et al., 2011; Pinchuk & Eisner, 2017). However, previous studies on the relationships between water mass and zooplankton communities focused exclusively on the SCS region (Ershova, Hopcroft, Kosobokova, Matsuno et al., 2015; Kasyan, 2020; Matsuno et al., 2011; Pinchuk & Eisner, 2017; Xu et al., 2018). The present study included a large area from the SCS to the ESS.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies reported marked changes in zooplankton community structures, and a large number of Pacific species have occurred in the SCS since the 2000s (Ershova, Hopcroft, Kosobokova, Matsuno et al., 2015; Kim et al., 2020; Matsuno et al., 2011). The physicochemical properties of water masses influence the structure of the zooplankton community in the SCS (Ershova, Hopcroft, Kosobokova, Matsuno et al., 2015; Xu et al., 2018) and the eastern parts of SCS (Pinchuk & Eisner, 2017; Spear et al., 2019). Despite numerous previous studies on zooplankton community structures in the SCS, the factors driving regional and interannual variations in zooplankton communities in the northern Chukchi Sea (NCS) and ESS remain elusive.…”

Section: Introductionmentioning

confidence: 99%

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Spatial and Interannual Patterns of Epipelagic Summer Mesozooplankton Community Structures in the Western Arctic Ocean in 2016–2020

Kim

Cho

et al. 2022

JGR Oceans

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Mesozooplankton play a crucial role as primary or secondary consumers in Arctic ecosystems and are sensitive indicators of environmental changes. This research is the first comprehensive Arctic zooplankton study covering the area ranging from the southern Chukchi Sea (SCS) and the northern Chukchi Sea (NCS) to the East Siberian Sea (ESS). Mesozooplankton samples were collected at 151 stations in the western Arctic Ocean each August from 2016 to 2020. The mesozooplankton abundance of the study area ranged from 9 to 6,172 ind. m−3, and the predominant group was copepods at 7–3,866 ind. m−3, of which Pseudocalanus spp. and Calanus glacialis were the most abundant copepods. In the SCS, small copepods and meroplankton, such as Pseudocalanus spp., Cirripedia larvae, Echinodermata larvae, and Centropages abdominalis were the predominant taxa. Especially in 2019, C. abdominalis dominated over meroplankton when water temperatures were high (maximum 12.5°C; sea surface temperature, SST). In the NCS and ESS, C. glacialis, Pseudocalanus spp., Metridia longa, Oithona similis, Parasagitta elegans, and Calanus hyperboreus were abundant. The distributions and structures of mesozooplankton communities indicated variability over large spatial scales in the western Arctic waters because of variations in multiple factors, such as water temperature, salinity, and sea ice; however, geographical effects cannot be ignored even during alterations in the physical properties. Our results suggest that these variable patterns of mesozooplankton communities fluctuate horizontally from south to north as warming progresses on a regional bathymetric basis, and can be used to infer the fate of mesozooplankton communities in the study area.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial and Interannual Patterns of Epipelagic Summer Mesozooplankton Community Structures in the Western Arctic Ocean in 2016–2020

Kim

Cho

et al. 2022

JGR Oceans

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“…The increasing Pacific Inflow Water has changed local hydrographic features in the Arctic Ocean and transported more Pacific-origin species into the Arctic: a process called Pacification ( Woodgate, 2018 ; Polyakov et al, 2020 ). Studies on the Pacific Arctic Region Pacification have mainly focused on mesozooplankton and phytoplankton communities ( Ershova et al, 2015 ; Wassmann et al, 2015 ; Hunt et al, 2016 ; Wang et al, 2018 ; Xu et al, 2018 ; Lewis et al, 2020 ; Wang Y. et al, 2020 ; Mueter et al, 2021 ; Zhuang et al, 2021 ). By analyzing mesozooplankton data from 1946 to 2012, Ershova et al (2015) found that the distribution of Pacific copepods ( Eucalanus bungii , Metridia pacifica , and Neocalanus spp.)…”

Section: Introductionmentioning

confidence: 99%

Hydrographic Feature Variation Caused Pronounced Differences in Planktonic Ciliate Community in the Pacific Arctic Region in the Summer of 2016 and 2019

Wang

Yang

et al. 2022

Front. Microbiol.

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Planktonic ciliates are an important component of microzooplankton, but there is limited understanding of their responses to changing environmental conditions in the Pacific Arctic Region. We investigated the variations of ciliate community structure and their relationships with environmental features in the Pacific Arctic Region in the summer of 2016 and 2019. The Pacific water was warmer and more saline in 2019 than in 2016. The abundance and biomass of total ciliate and aloricate ciliate were significantly higher in 2019 than those in 2016, while those of tintinnid were significantly lower. The dominant aloricate ciliate changed from large size-fraction (> 30 μm) in 2016 to small size-fraction (10–20 μm) in 2019. More tintinnid species belonging to cosmopolitan genera were found in 2019 than in 2016, and the distribution of tintinnid species (Codonellopsis frigida, Ptychocylis obtusa, and Salpingella sp.1) in 2019 expanded by 5.9, 5.2, and 8.8 degrees further north of where they occurred in 2016. The environmental variables that best-matched tintinnid distributions were temperature and salinity, while the best match for aloricate ciliate distributions was temperature. Therefore, the temperature might play a key role in ciliate distribution. These results provide basic data on the response of the planktonic ciliate community to hydrographic variations and implicate the potential response of microzooplankton to Pacification as rapid warming progresses in the Pacific Arctic Region.

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“…The occurrence and community structure of Pacific copepod species in the Chukchi Sea are influenced by the composition of water masses flowing from the Bering Sea (Hopcroft et al, 2010;Eisner et al, 2013;Questel et al, 2013;Ershova et al, 2015b;Pinchuk and Eisner, 2017;Xu et al, 2018;Spear et al, 2019). In the southern Chukchi Sea, the northward shift of Pacific zooplankton species is largely correlated with the inflow of Bering Summer Water (BSW) through the Bering Strait (Matsuno et al, 2011;Ershova et al, 2015b).…”

Section: Introductionmentioning

confidence: 99%

“…In one sense, it is thought that the reasons for the mass occurrence of the Pacific copepod species in the Chukchi Sea were difficult to define because research addressing the impact on environmental factors offered only a snapshot and included too few cases. In addition, understanding the impact on the water mass, which is known to have the greatest influence on zooplankton communities, was further complicated by analyses of water systems using different water mass classification criteria (e.g., Matsuno et al, 2011;Questel et al, 2013;Ershova et al, 2015b;Corlett and Pickart, 2017;Pinchuk and Eisner, 2017;Xu et al, 2018;Spear et al, 2019). The characteristics of water masses flowing northward through the Bering Strait and directly affecting the occurrence of Pacific copepod species need to be clarified if we are to understand the interannual variations in Pacific zooplankton abundances in the Chukchi Sea.…”

Section: Introductionmentioning

confidence: 99%

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

Kim

Cho

et al. 2020

Front. Mar. Sci.

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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 to 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 coincided with the relatively warm BSW, instead of other water masses. 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.

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Inter-annual variation of the summer zooplankton community in the Chukchi Sea: spatial heterogeneity during a decade of rapid ice decline

Cited by 13 publications

References 49 publications

Spatial and Interannual Patterns of Epipelagic Summer Mesozooplankton Community Structures in the Western Arctic Ocean in 2016–2020

Spatial and Interannual Patterns of Epipelagic Summer Mesozooplankton Community Structures in the Western Arctic Ocean in 2016–2020

Hydrographic Feature Variation Caused Pronounced Differences in Planktonic Ciliate Community in the Pacific Arctic Region in the Summer of 2016 and 2019

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

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