Geographical and seasonal variations in abundance, biomass and estimated production rates of microzooplankton in the Inland Sea of Japan

Uye, Shin-ichi; Nagano, Naoki; Tamaki, Hidenori

doi:10.1007/bf02239460

Cited by 107 publications

(68 citation statements)

References 35 publications

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“…As thraustochytrids are epibiotically abundant (Karling 1981), it is reasonable to expect the ratio from the particle-bound populations to be larger than that from the planktonic populations. The abundance of planktonic thraustochytrids was 3 to 4 orders of magnitude lower than that of heterotrophic nanoflagellates (average 43 pm3) in the Seto Inland Sea (Iwamoto et al 1994), but 10 times larger than that of the ciliate microzooplankton in the same area (103 to 106 pm3; Uye et al 1996). The biovolume of the observed thraustochytrids was approximately 65 to 4200 pm3, assuming a spherical shape with a diameter of 5 to 20 pm.…”

Section: Ecological Implicationsmentioning

confidence: 93%

Abundance of thraustochytrids in coastal plankton

Naganuma¹,

Takasugi²,

Kimura³

1998

Mar. Ecol. Prog. Ser.

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The abundance of thraustochytrids was investigated in and off the Seto Inland Sea, Japan. Thraustochytrid cells were stained with acriflavine and counted directly by epifluorescence rnicroscopy. Thraustochytrids were present in the water column at a density of 2.1 X 103 to 5.6 X 10' cells I-', with an overall average of 1.0 X 104 cells I-', which was about IO-' to 10-%of the bacterioplankton abundance. In contrast to the low abundance of thraustochytrids, their biovolume was estmated to compose a not negligible fraction of manne microbiota, correspond~ng to about 3 to 43'-X, of the bacterioplankton b~ovolume. Thus, it is suggested that thraustochytrids play an ecological role as alternative food sources for picoplankton feeders, as well as being actlve degraders and consumers in aquatic microbial food chains.

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Section: Ecological Implicationsmentioning

confidence: 93%

Abundance of thraustochytrids in coastal plankton

Naganuma¹,

Takasugi²,

Kimura³

1998

Mar. Ecol. Prog. Ser.

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“…, Uye et al 1996, Uye & Shimazu 1997, its seasonal fluctuation is extremely wide, from ca. 10 to ca.…”

Section: ϫ3mentioning

confidence: 99%

Combined effects of food supply and temperature on asexual reproduction and somatic growth of polyps of the common jellyfish Aurelia aurita s.l.

Han

Uye

2010

Plankton Benthos Res

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116

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Abstract:The polyp stage is an important part of the Aurelia aurita s.l. life cycle, because polyp clones are able to increase their population size by budding, providing the opportunity to increase the medusa population by the production of many ephyrae through strobilation. We investigated asexual reproduction of A. aurita polyps on an individual basis at 4 different temperatures (i.e. 18, 22, 26 and 28 o C) and at 5 different food levels (i.e. 1.7, 3.3, 6.6, 10 and 13.3 mg) in the laboratory. Three types of asexual reproduction were observed: polyps directly budded from the parent stalk (DBP), polyps budded from the parent pedal stolon (SBP), and podocysts (PC). DBP was the major reproductive method (94% of the total) and SBP and PC accounted for only 5 and 1%, respectively. PC were produced by the polyps kept under low food supply (Յ3.3 mg C polyp Ϫ1 d Ϫ1) and high temperature (Ն26°C). Production of new polyps by DBP and SBP significantly increased with increasing food and temperature. The somatic growth of parent polyps significantly increased with more food and cooler temperatures. We conclude that both increases in water temperature through global warming and increases in abundances of zooplankton prey because of eutrophication may be responsible for the prominent blooms of A. aurita medusae in East Asian coastal waters in recent times.

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“…Integrated POC concentrations in the upper 50 m of the water column were approximately one third in winter (4 to 8 gC m Abundances of the different groups of the plankton were transformed into carbon biomass by using the following equations: bacteria = 20 fgC cell -1 (Lee & Fuhrman 1987), flagellates = 6500 fgC cell -1 (Børsheim & Bratbak 1987), tintinnids = pgC = (µm 3 ) × 0.053 + 444.5 (Verity & Langdon 1984), thecate dinoflagellates = pgC = (µm 3 ) × 0.13 (Edler 1979), copepod nauplii = ngC = 1.51 × 10 -5 LC 2.94 (LC: length of cephalothorax; Uye et al 1996), calanoid copepods = 26.9 µgC cop -1 (González et al 2000, Hirst et al 2003, euphausiids = 3812 µgC euph ). The dominant taxa in spring were the thecate dinoflagellate genera Diplopsalis and Protoperidinium, whereas, in winter, tintinnids (genus Salpingella) and thecate dinoflagellates (genera Ceratium and Protoperidinium) dominated at Stns 44 and 20.…”

Section: Chl a And Poc Concentrationsmentioning

confidence: 99%

Primary production and plankton dynamics in the Reloncaví Fjord and the Interior Sea of Chiloé, Northern Patagonia, Chile

González

Calderón²,

Castro³

et al. 2010

Mar. Ecol. Prog. Ser.

123

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), respectively, from winter to spring. In addition, the bacterial secondary production to primary production (BSP:PP) ratio decreased from 3.7 to 0.2 in Reloncaví Fjord, suggesting a transition from microbial to classical pelagic food webs. The higher solar radiation and extended photoperiod of springtime promoted the growth of diatoms in a nutrient-replete water column. Allochthonous (river discharge) and autochthonous (phytoplankton exudates) organic matter maintained high year-round bacteria biomass and secondary production. In spring, grazing pressure from zooplankton on the microplankton (largely diatoms) resulted in the relative dominance of the classical food web, with increased export production of zooplankton faecal pellets and ungrazed diatoms. Conversely, in winter, zooplankton grazing, mainly on nanoplankton, resulted in a relative dominance of the microbial loop with lower export production than found in spring. Carbon fluxes and fjord-system functioning are highly variable on a seasonal basis, and both the multivorous trophic webs and the carbon export were more uncoupled from local PP than coastal areas.

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Geographical and seasonal variations in abundance, biomass and estimated production rates of microzooplankton in the Inland Sea of Japan

Cited by 107 publications

References 35 publications

Abundance of thraustochytrids in coastal plankton

Abundance of thraustochytrids in coastal plankton

Combined effects of food supply and temperature on asexual reproduction and somatic growth of polyps of the common jellyfish Aurelia aurita s.l.

Primary production and plankton dynamics in the Reloncaví Fjord and the Interior Sea of Chiloé, Northern Patagonia, Chile

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