Year-to-year changes of the mesozooplankton community in the Chukchi Sea during summers of 1991, 1992 and 2007, 2008

Matsuno, Kohei; Yamaguchi, Atsushi; Hirawake, Toru; Imai, Ichiro

doi:10.1007/s00300-011-0988-z

Cited by 66 publications

(50 citation statements)

References 29 publications

(23 reference statements)

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“…The zooplankton community in the Chukchi Sea is known to have large spatial and temporal changes (Springer et al, 1989;Llinás et al, 2009;Matsuno et al, 2011). The total zooplankton abundance in this study was approximately half (mean: 34 059 ind.…”

Section: Zooplankton Communitymentioning

confidence: 57%

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Short-term changes in the mesozooplankton community and copepod gut pigment in the Chukchi Sea in autumn: reflections of a strong wind event

et al. 2015

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Abstract.To evaluate the effect of atmospheric turbulence on a marine ecosystem, high-frequency samplings (two to four times per day) of a mesozooplankton community and the gut pigment of dominant copepods were performed at a fixed station in the Chukchi Sea from 10 to 25 September 2013. During the study period, a strong wind event (SWE) was observed on 18 September. After the SWE, the biomass of chlorophyll a (Chl a) increased, especially for micro-size ( > 10 µm) fractions. The zooplankton abundance ranged from 23 610 to 56 809 ind. m −2 and exhibited no clear changes as a result of the SWE. In terms of abundance, calanoid copepods constituted the dominant taxa (mean: 57 %), followed by barnacle larvae (31 %). Within the calanoid copepods, small-sized Pseudocalanus spp. (65 %) and large-sized Calanus glacialis (30 %) dominated. In the population structure of C. glacialis, copepodid stage 5 (C5) dominated, and the mean copepodid stage did not vary with the SWE. The dominance of accumulated lipids in C5 and C6 females with immature gonads indicated that they were preparing for seasonal diapause. The gut pigment of C. glacialis C5 was higher at night and was correlated with ambient Chl a, and a significant increase was observed after the SWE (2.6 vs. 4.5 ng pigment ind. −1 ). The grazing impact by C. glacialis C5 was estimated to be 4.14 mg C m −2 day −1 , which corresponded to 0.5−4.6 % of the biomass of the micro-size phytoplankton. Compared with the metabolic food requirement, C. glacialis feeding on phytoplankton accounted for 12.6 % of their total food requirement. These facts suggest that C. glacialis could not maintain their population by feeding solely on phytoplankton and that other food sources (i.e., microzooplankton) must be important in autumn. As observed by the increase in gut pigment, the temporal phytoplankton bloom, which is enhanced by the atmospheric turbulence (SWE) in autumn, may have a positive effect on copepod nutrition.

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Section: Zooplankton Communitymentioning

confidence: 57%

“…m −2 ) was 13-55 % lower than that in summer (19 114-79 899 ind. m −2 ; Matsuno et al, 2011). It should also be noted that the abundance of barnacle larvae decreased significantly during the study period (Table 1).…”

Section: Zooplankton Communitymentioning

confidence: 69%

Short-term changes in the mesozooplankton community and copepod gut pigment in the Chukchi Sea in autumn: reflections of a strong wind event

et al. 2015

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“…Adding to the confusion, there may be two separate populations of C. glacialis, one that occurs in the northern Bering Sea and the Chukchi Sea, and one that originates in the Arctic (Nelson et al, 2009), with the current view being that C. marshallae is uncommon in the Chukchi Sea. Although C. glacialis reproduces in the northern Bering and Chukchi Seas (Frost, 1974;Matsuno et al, 2011;Nelson et al, 2009;Plourde et al, 2005), it is unclear what differences in overwintering or reproductive strategies might exist between the two populations.…”

Section: Tablementioning

confidence: 99%

“…The large sub-arctic zooplankton species found in the Chukchi Sea require over-wintering at depths of 500 m or more (e.g., Eucalanus bungii, Neocalanus spp. ), and it is likely that they were advected from the Aleutian Basin (Matsuno et al, 2011), probably in the year that they were sampled, given the transit time in spring from Anadyr Strait by St. Lawrence Island to the Bering Strait.…”

Section: Tablementioning

confidence: 99%

The Barents and Chukchi Seas: Comparison of two Arctic shelf ecosystems

Hunt

Blanchard

Boveng

et al. 2013

Journal of Marine Systems

142

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“…Changes in secondary producers have also been reported for the Chukchi and adjacent seas. Higher abundance and biomass of mesozooplankton during summers in 2000s than 1990s in the Chukchi Sea is considered to be less ice and warmer temperature (Matsuno et al 2011). Warmer temperature of less ice condition in the northern Bering Sea is expected to enhance zooplankton grazing activity on phytoplankton .…”

Section: Introductionmentioning

confidence: 99%

Changes in phytoplankton community structure during wind-induced fall bloom on the central Chukchi shelf

et al. 2018

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The recent increasing of atmospheric turbulence has had considerable impact on the oceanic environment and ecosystems of the Arctic. To understand its effect on phytoplankton community structure, a Eulerian fixed-point observation (FPO) was conducted on the Chukchi shelf in fall 2013. Temporal and vertical distributions of the phytoplankton community were inferred from algal pigment signatures. A strong wind event (SWE) occurred during the observation term, and significant convection supplied nutrients from the bottom layer to the surface. Before the SWE, pigment composition in the warmer, less saline, and nutrient-poor surface waters was diverse with low concentration of chlorophyll-a (chla). Vertical mixing induced by the SWE weakened the stratification and brought sufficient nutrients to enhance diatom-derived pigment concentrations (e.g., fucoxanthin and chlc3), suggesting increases in diatoms. We also developed a model to predict the distribution of major phytoplankton pigment/chla ratios using a profiling multi-wavelength fluorometer (Multi-Exciter) with higher spatio-temporal resolution. The Multi-Exciter also captured changes in pigment composition with environmental changes at the FPO site and at four observation sites 16 km from the location of the FPO. Furthermore, we investigated the change in grazing rates of the major Arctic copepod Calanus glacialis copepodid stage five to assess the interaction between primary and secondary producers during the fall bloom. Increased diatom biomass caused a significant increase in the grazing rate on microphytoplankton (> 20 µm) and a decrease on nanophytoplankton (2-20 µm), indicative of a strong cascade effect because of the reduction of microzooplankton due to the grazing from C. glacialis. We conclude that SWEs during fall might affect food webs via the alternation of seasonal succession of phytoplankton community structure.

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Year-to-year changes of the mesozooplankton community in the Chukchi Sea during summers of 1991, 1992 and 2007, 2008

Cited by 66 publications

References 29 publications

Short-term changes in the mesozooplankton community and copepod gut pigment in the Chukchi Sea in autumn: reflections of a strong wind event

Short-term changes in the mesozooplankton community and copepod gut pigment in the Chukchi Sea in autumn: reflections of a strong wind event

The Barents and Chukchi Seas: Comparison of two Arctic shelf ecosystems

Changes in phytoplankton community structure during wind-induced fall bloom on the central Chukchi shelf

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