Asexual reproduction of the stalked ciliate Zoothamnium attached to the copepod Centropages abdominalis.

Nagasawa, Sachiko

doi:10.2183/pjab.63.101

Cited by 11 publications

(22 citation statements)

References 3 publications

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“…C. abdominalis population had two marked peaks; the peak in February was far higher than that in March. 2); one peak in February was less than 10%, whereas two peaks in March and April were approximately 30% similar to those in 1985 (Nagasawa, 1986). Ciliates which were identified as Zoothamnium were attached only to C. abdominalis; A. omorii was not infested.…”

Section: Resultsmentioning

confidence: 83%

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The copepod Centropages abdominalis as a carrier of the stalked ciliate Zoothamnium

Nagasawa

1988

Hydrobiologia

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Adult specimens of the calanoid copepod Centropages abdominalis collected from February through April 1986 in Shinhamako, a saline lake connected to Tokyo Bay, were heavily infested with the stalked ciliate Zoothamnium. The number of copepods and those infested varied during the infestation period; in February when the copepod population was large, the incidence of infestation was low, whereas in March when the copepod population was small, copepods infested with Zoothamnium were proportionally more abundant. Numerical variations of infested copepods may correspond to changes in the Zoothamnium population. No specimens of Acartia omorii, which coexists with C. abdominalis, were infested in 1986, although a small number of A. omorii were infested with peritrich ciliates in 1985. Some shrimp larvae were also covered with the same peritrichs as copepods. Nevertheless, as a whole, the relationship between the phoront and its carrier seems to be specific. The highest incidence of infested copepods was approximately 30% similar to that in 1985. The sex ratio of C. abdominalis changed on each sampling date but in general females were more numerous than males. The percentage of infested males was higher than that of infested females, suggesting that the former can be attached to more easily than the latter.

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Section: Resultsmentioning

confidence: 83%

“…In the area studied copepods with ciliates appeared not only in 1986 but also in 1985 (Nagasawa, 1986). However, such infestation did not occur in 1987 (unpubl.…”

Section: Discussionmentioning

confidence: 90%

The copepod Centropages abdominalis as a carrier of the stalked ciliate Zoothamnium

Nagasawa

1988

Hydrobiologia

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“…Mar Ecol Prog Ser 282: [129][130][131][132][133][134][135][136][137][138][139][140][141][142] 2004 are epibionts which live exclusively on the copepod body surface (Steuer 1932, Sewell 1951, Hiromi et al 1985, Nagasawa 1986, Fernandez-Leborans & TatoPorto 2000.…”

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confidence: 99%

“…Recent studies have reported that the population dynamics of marine copepods is highly influenced by several endoparasitoid dinoflagellates (Ianora et al 1987, Kimmerer & McKinnon 1990. A large number of pennate diatoms and peritrich ciliates are epibionts which live exclusively on the copepod body surface (Steuer 1932, Sewell 1951, Hiromi et al 1985, Nagasawa 1986, Fernandez-Leborans & TatoPorto 2000.…”

Section: Introductionmentioning

confidence: 99%

Morphology and host-specificity of the apostome ciliate Vampyrophrya pelagica infecting pelagic copepods in the Seto Inland Sea, Japan

Ohtsuka

Hora²,

Suzaki³

et al. 2004

Mar. Ecol. Prog. Ser.

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The morphology and host-specificity of the histophagous apostome ciliate Vampyrophrya pelagica infecting pelagic copepods in the Seto Inland Sea, Japan, were intensively investigated. Four stages were reconfirmed in the life cycle of the ciliate. A mature cell within the phoront bears cilia ready for quick excystation, and unique lamellar structures in the cytoplasm appear to be precursors of food vacuole membranes. These lamellar structures completely disappear in the fully grown trophont. The phoronts were attached to the ventral surface of the copepod prosome or legs, but were almost totally absent on the urosome. The number of phoronts per copepod was up to 43 for the adult female of Paracalanus parvus s.l. Phoront attachment was found irrespective of developmental stage and sex of P. parvus s.l., although the early copepodid stages were less frequently infected than the later stages, and the adult female was more intensively infected than the adult male. There was a marked seasonal change in prevalence and host-specificity of the phoronts. From middle summer to early winter, P. parvus s.l., Acartia pacifica, Tortanus forcipatus, Euterpina acutifrons, and Corycaeus affinis were frequently infected, while Oithona spp. and Microsetella norvegica were rarely infected, whereas from late winter to early summer, phoronts were detected only on the large-sized calanoids, Calanus sinicus and Euchaeta plana. This may be explained by a combination of longevity and molting of copepods, turnover time of the apostome life cycle which depends on water temperature, and seasonal changes in the abundance and food selectivity of predatory chaetognaths. Considering the high prevalence of apostome ciliates on not only copepods but also other crustaceans in the world oceans, the ecological influence of these ciliates on marine ecosystems should be re-evaluated. KEY WORDS: Apostome ciliate· Vampyrophrya pelagica · Copepod · Parasite · Host · Histophagy · Trophodynamics Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 282: [129][130][131][132][133][134][135][136][137][138][139][140][141][142] 2004 are epibionts which live exclusively on the copepod body surface (Steuer 1932, Sewell 1951, Hiromi et al. 1985, Nagasawa 1986, Fernandez-Leborans & TatoPorto 2000.Apostome ciliates are known to infect a wide variety of marine and freshwater crustaceans including shallow-and deep-water copepods (Chatton & Lwoff, 1935, Sewell 1951, Kudo 1966, Lindley 1978, Grimes & Bradbury 1992, Ohtsuka et al. 2003. The complex, unique life cycle of the apostome ciliate Vampyrophrya pelagica (Chatton and Lwoff) on coastal copepods was elucidated by Grimes & Bradbury (1992). According to them, 4 functionally different stages are recognized in this apostome: phoront (resting stage), trophont (feeding stage), tomont (division stage), and tomite (infective stage). Excystation of the trophont is triggered either by injury to the host (single-host cycle) or by predation by invertebrate predators such as...

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“…V oceanica) without metabolic exploitation or exchange . Phoresis seems to be species specific according to Herman & Mihursky (1964) and Nagasawa (1986Nagasawa ( , 1988 . In these three studies the hosts were copepods rather than diatoms ; only Acartia tonsa (Herman & Mihursky, 1964) and Centropages abdominalis (Nagasawa, 1986(Nagasawa, , 1988) had a stalked ciliate Zoothamnium whereas other species of copepods were free from epibionts .…”

Section: Resultsmentioning

confidence: 98%

Redescription of Vorticella oceanica Zacharias, 1906 (Ciliophora: Peritrichia) with notes on its host, the marine planktonic diatom Chaetoceros coarctatum Lauder,1864

Nagasawa

Warren

1996

Hydrobiologia

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Species of the marine planktonic diatom Chaetoceros were collected over a three year period from Otsuchi Bay, Japan . The vertical distribution of Chaetoceros spp . over a 40 m depth was investigated . One species, C. coarctatum, was found to have chloroplasts of two different shapes . Chaetoceros coarctatum was also the only species found in association with the ciliate epibiont Vorticella oceanica . The numerical abundance of VV oceanica was closely correlated to that of its host at certain depths . Potential food sources for V oceanica in Otsuchi Bay were identified . Vorticella oceanica is redescribed following examination by light and scanning electron microscopy .

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Asexual reproduction of the stalked ciliate Zoothamnium attached to the copepod Centropages abdominalis.

Cited by 11 publications

References 3 publications

The copepod Centropages abdominalis as a carrier of the stalked ciliate Zoothamnium

The copepod Centropages abdominalis as a carrier of the stalked ciliate Zoothamnium

Morphology and host-specificity of the apostome ciliate Vampyrophrya pelagica infecting pelagic copepods in the Seto Inland Sea, Japan

Redescription of Vorticella oceanica Zacharias, 1906 (Ciliophora: Peritrichia) with notes on its host, the marine planktonic diatom Chaetoceros coarctatum Lauder,1864

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