Seasonal changes in abundance and vertical distribution of Mesocyclops thermocyclopoides, Cyclops vicinus and Daphnia longispina in Lake Biwa.

Kawabata, Keiichi

doi:10.3739/rikusui.50.9

Cited by 18 publications

(18 citation statements)

References 7 publications

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“…The samples of Mesocyclops thermocyclopoides recorded in Kawabata (1989) have been examined again and are also Mesocyclaps dissimilis n. sp. However, we do not exclude the possibility of the presence of other Mesocyclaps in lake Biwa.…”

Section: Discussionmentioning

confidence: 99%

“…Until the detailed studies by Kiefer (198 l), Dussart (1982Dussart ( , 1984 and Van de Velde (1984) Mesocyclops leuckarti (Claus, 1857) described from Germany, was considered to be cosmopolitan. In Japan, the M. 'Zeuckarti' from Lake Biwa was re-allocated to M. thermocyclopoides Harada, 1931(Kawabata, 1989. A new study of samples collected by Mr T. Ueda, Otsu Hydrobiological Station, Kyoto University, and one of us (K.W.)…”

Section: Introductionmentioning

confidence: 99%

“…of same origin as the types. Samples from older collections in the north basin of Lake Biwa (Kawabata, 1989) have been examined too: 7 specimens from 9-5-1985, 12 from 12-7-1985; 8 from 2-9-1986. Description of female Length excluding furcal setae: 1200 pm (range: 1080-1200 pm, m = 1120, n = 8).…”

Section: Introductionmentioning

confidence: 99%

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Mesocyclops dissimilis n. sp. from Lake Biwa, Japan (Copepoda, Cyclopoida)

Defaye

Kawabata

1993

Hydrobiologia

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mesocyclops dissimilis n. sp. from Lake Biwa, Japan (Copepoda, Cyclopoida)

Defaye

Kawabata

1993

Hydrobiologia

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“…It feeds on small planktonic algae (Okamoto 1984) and is preyed upon by fishes (Kawabata et al 2002) and by the cyclopoid copepod Mesocyclops dissimilis Defaye et Kawabata, 1993(Kawabata 1991. Since high mortality rates of E. japonicus coincided with high densities of M. dissimilis in Lake Biwa (Kawabata 1989(Kawabata , 1993, M. dissimilis is supposed to be an important predator of E. japonicus. The predation rates of cyclopoid copepods, however, have only rarely been measured on copepod prey compared to with rotifer or cladoceran prey (Williamson & Reid 2001).…”

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confidence: 99%

“…L Ϫ1 , and that of the fourth naupliar stage to CIII E. japonicus was 55 (58) ind. L Ϫ1 (Kawabata 1987(Kawabata , 1989. The present initial densities of predators (5 ind.…”

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Clearance rate of the cyclopoid copepod Mesocyclops dissimilis on the calanoid copepod Eodiaptomus japonicus

Kawabata

2006

Plankton Benthos Res

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Clearance rate of the planktonic cyclopoid copepod Mesocyclops dissimilis on the planktonic calanoid copepod Eodiaptomus japonicus was measured in laboratory experiments. Ontogenetic changes were investigated using several combinations of different developmental stages of the two species. To minimize the side effects of laboratory experiments, predation was examined for a short duration using field-captured animals at natural prey densities and temperatures. Individual predators showed a large variation in the clearance rate even within replicates of the same experiment. The clearance rates of adult female predators on late naupliar prey were similar (about 0.15 L ind.Ϫ1 d Ϫ1) within a range of prey density 12-31 ind. L Ϫ1. Ontogenetic tendencies in clearance rate, though seldom significant, translated to an increase with development of the predators and a decrease with that of the prey. Present clearance rates and the natural densities of predators and prey suggest that M. dissimilis was sometimes an influential predator of E. japonicus in the field.

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Planktivorous fish predation masks anthropogenic disturbances on decadal trends in zooplankton biomass and body size structure in Lake Biwa, Japan

Liu

Dur

Ban

et al. 2019

Limnology & Oceanography

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Pelagic zooplankton samples from Lake Biwa, Japan, collected monthly since 1971, were analyzed for biomass and body size structure. Our aim was to clarify the relative effects of food availability and global warming vs. top‐down control by fish predation on long‐term trends. Annual mean biomass and density‐weighted body size were calculated and compared with water temperature, total phosphorus (TP), as a proxy of food amount, and catch per unit effort (CPUE) of Ayu (Plecoglossus altivelis altivelis), as a proxy of planktivorous fish predation pressure. Mean water temperature above 20 m increased by 0.94°C. TP increased until 1974 and then decreased until 1985, becoming stable after that. Ayu CPUE increased until 1987 and then declined. The study period can be divided into two nutritional phases: a high TP phase (1971–1985) and a low‐stable TP phase (1986–2010). Five zooplankton taxa, Eodiaptomus japonicus, Cyclopoida spp., Daphnia spp., Bosmina longirostris, and Diaphanosoma orientalis, were continuously dominant. Annual mean total crustacean biomass varied from 0.3 to 3.6 g dry weight m−2, slightly decreasing until 1993 but increasing thereafter. Generalized linear models showed that annual mean body sizes were affected by temperature and CPUE, whereas annual mean biomass was affected by TP and CPUE. These had no effect during the high TP phase, whereas only CPUE affected both traits during the low‐stable TP phase. We concluded that zooplankton biomass and body size long‐term trends were mostly influenced by fish predation and that eutrophication and global warming impacts might be affected by top‐down control.

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Seasonal changes in abundance and vertical distribution of Mesocyclops thermocyclopoides, Cyclops vicinus and Daphnia longispina in Lake Biwa.

Abstract: Mesocyclops thermocyclopoides, Cyclops vicinus and Daphnia longispina were col-

Cited by 18 publications

References 7 publications

Mesocyclops dissimilis n. sp. from Lake Biwa, Japan (Copepoda, Cyclopoida)

Mesocyclops dissimilis n. sp. from Lake Biwa, Japan (Copepoda, Cyclopoida)

Clearance rate of the cyclopoid copepod Mesocyclops dissimilis on the calanoid copepod Eodiaptomus japonicus

Planktivorous fish predation masks anthropogenic disturbances on decadal trends in zooplankton biomass and body size structure in Lake Biwa, Japan

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