Distribution, quantitative composition, and feeding of jellyfish in the Western Bering Sea in summer and fall

Zavolokin, A. V.; Glebov, I. I.; Kosenok, N. S.

doi:10.1134/s1063074008070043

Cited by 17 publications

(12 citation statements)

References 3 publications

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“…Regular blooms of gelatinous zooplank ton have been observed off the coast of Japan [30,47]. In the Sea of Okhotsk and Bering Sea, the jellyfish bio mass also varied greatly from year to year [7,9,10].…”

Section: Factors That Determine Jellyfish Biomassmentioning

confidence: 99%

“…A detailed analysis of the seasonal variations in the abundance and size structure of jellyfish from June until October was performed for the western Bering Sea [7]. The biomass of most species, except for Chrysaora melanaster, was shown to grow from the summer to the fall.…”

Section: Information On Seasonal Jellyfish Biomass Variationsmentioning

confidence: 99%

“…During surges of abundance, its role as a consumer of plankton, spawn, and juvenile fish and squid grows sharply [2,8,12,17,21,33,35,40,44], which may greatly affect the state of the resources of commercial species. Hence, esti mation of the abundance of jellyfish, and analysis of its seasonal and year to year dynamics in order to deter mine the significance for marine communities in vari ous periods, remains an important field of ecosystem studies.…”

Section: Introductionmentioning

confidence: 99%

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Jellyfish of the Far Eastern Seas of Russia. 3. Biomass and abundance

Zavolokin¹

2011

Russ J Mar Biol

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The biomass and abundance of large jellyfish (Cnidaria: Scyphozoa, Hydrozoa) was estimated and their seasonal and interannual dynamics was studied based on the data of trawl surveys conducted by the Pacific Research Fisheries Center (TINRO Center) in the Sea of Okhotsk, Bering Sea, Sea of Japan, and the Northwestern Pacific Ocean (NWPO) in 1991-2009. Most of the jellyfish biomass (over 95%) in the Sea of Okhotsk, Bering Sea, and NWPO was formed by Chrysaora spp., Cyanea capillata, Aequorea spp., Phacello phora camtschatica, and Aurelia limbata. The same species along with Calycopsis nematophora predominated in abundance in the Bering Sea and NWPO, while Ptychogena lactea, C. capillata, and Chrysaora spp. were most abundant in the Sea of Okhotsk. In the northwestern Sea of Japan, Aurelia aurita, C. capillata, and Aequorea spp. predominated both in abundance and biomass. Generally, the jellyfish abundance reached the highest values in the summer and fall and decreased abruptly in the winter. Meanwhile, the seasonal dynamics proved to be specific for each species and were manifested in some of them by reaching maximum values at various periods of the warm season, whereas the other (Tima sachalinensis and P. lactea) showed the reverse pattern of seasonal variations, with the highest abundance in cold months. Jellyfish biomass and abundance varied greatly from year to year, which was related to the short lifecycle and alternation between sexual and asexual generations, in which reproductive success was predetermined by various environmental factors. In the fall, year to year fluctuations of the relative biomass could increase by ten times. In

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Section: Factors That Determine Jellyfish Biomassmentioning

confidence: 99%

Section: Information On Seasonal Jellyfish Biomass Variationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Jellyfish of the Far Eastern Seas of Russia. 3. Biomass and abundance

Zavolokin¹

2011

Russ J Mar Biol

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“…Feeding ecology of jellyfish has been studied using gut content analysis and grazing experiments (Sullivan et al, 1994;Graham & Kroutil, 2001;Mutlu, 2001;Zavolokin et al, 2008). Zooplanktons (e.g.…”

Section: Introductionmentioning

confidence: 99%

Potential dietary influence on the stable isotopes and fatty acid compositions of jellyfishes in the Yellow Sea

Cui

Zhang

et al. 2012

J. Mar. Biol. Ass.

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Stable carbon and nitrogen isotopes and fatty acid compositions of Aurelia aurita, Stomolophus meleagris and Cyanea nozakii collected from the Yellow Sea in August 2009, were analysed. δ13C and δ15N values of the jellyfishes were in the range of −22.0‰ to −17.4‰ and 4.8‰ to 10.6‰, respectively, which indicated that jellyfishes in this study area were mainly dependent on marine-based carbon. The trophic levels of jellyfishes were estimated as between zooplanktons and high level carnivorous fishes. Low C18:1n-7/n-9 ratios and high C20:1 (n-11 and n-9) and C22:1 (n-11 and n-9) concentrations suggested jellyfishes in the Yellow Sea were carnivorous and zooplanktons were an important diet for them. Fatty acid compositions of jellyfishes were characterized by high C20:4n-6 concentration (>10%), with ratios of C20:5n-3/C22:6n-3 >1. Specific fatty acids (C20:1 + C22:1 and C20:4n-6) indicated that both pelagic-derived material and benthic detritus-derived food were diet of jellyfishes. Variations of certain biomarkers (C15:0 + C17:0, C20:1 + C22:1 (n-11 and n-9) and C20:4n-6) in jellyfishes of different body sizes suggested that ontogenetic diet shifts may take place during the growth of jellyfishes. Larger individuals with higher C20:1 + C22:1 (n-11 and n-9) concentration, tended to consume more zooplanktons; while the detritus-derived material made a more significant contribution to the small individuals, as suggested by higher C15:0 + C17:0 and C20:4n-6 concentrations. According to our study, besides the diet, species seemed to influence variations in stable isotopes and fatty acid compositions in jellyfishes.

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“…also found walleye pollock juveniles in about 20 % of the stomachs examined during two different years, but no other fi sh species were identifi ed. However, C. melanaster guts also contained lanternfi sh and unidentifi ed fi sh in its diet unlike the other jellyfi sh species examined (Zavolokin et al 2008 ). They also estimated that C. melanaster consumed roughly 32 % of the standing stock of zooplankton on the shelf during summer and as such could be a substantial competitor with many pelagic species.…”

Section: Predation On and Competition With Fishmentioning

confidence: 99%

Jellyfish Blooms

2014

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Distribution, quantitative composition, and feeding of jellyfish in the Western Bering Sea in summer and fall

Cited by 17 publications

References 3 publications

Jellyfish of the Far Eastern Seas of Russia. 3. Biomass and abundance

Jellyfish of the Far Eastern Seas of Russia. 3. Biomass and abundance

Potential dietary influence on the stable isotopes and fatty acid compositions of jellyfishes in the Yellow Sea

Jellyfish Blooms

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