Growth rate variability in geographically diverse clones of Uronema (Ciliophora: Scuticociliatida)

Pérez-Uz, Blanca

doi:10.1111/j.1574-6941.1995.tb00283.x

Cited by 25 publications

(16 citation statements)

References 40 publications

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“…Free-living ciliates may exhibit extensive intraspecific differences within a morphologically defined species (Nanney 1999(Nanney , 2005, and the extent of intraspecific ecophysiological differences recorded for aquatic ciliates may reach or exceed interspecific or even intergeneric differences (Pérez-Uz 1995, Weisse 2002, Weisse & Rammer 2006. Previous work on intraspecific differences among widely distributed aquatic heterotrophic protists has focused on temperature and salinity adaptation (Weisse & Montagnes 1998, Weisse et al 2001, Lowe et al 2005a,b, Weisse & Rammer 2006.…”

Section: Introductionmentioning

confidence: 99%

Local adaptation among geographically distant clones of the cosmopolitan freshwater ciliate Meseres corlissi. II. Response to pH

Weisse

Scheffel²,

Štádler³

et al. 2007

Aquat. Microb. Ecol.

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We investigated the pH response of 5 clones of the oligotrichine ciliate Meseres corlissi originating from 2 temperate localities in Austria, from a subtropical habitat in China, and from a warm-temperate habitat in Australia. The pH reaction norm was investigated under standard laboratory conditions, with the small cryptophyte Cryptomonas sp. provided as food at saturating food levels over the pH range 4.0 to 9.5. Experiments were conducted at 22.5°C and lasted for 24 h. We measured growth rate, cell length and volume, and cellular production at each pH. We found significant clone-specific differences in each measured parameter, which increased with geographical distance of the isolates. Overall, the pH reaction norms of the Austrian isolates were significantly different from those of the Australian and Chinese clones. The tolerance to low pH differed by up to 1.5 pH units between the clones, i.e. intraspecific differences were comparable with interspecific differences measured earlier under similar experimental conditions. Our results suggest that the pH reaction norm is not homogenous for the species, but that genetically and phenotypically different ecotypes may exist among free-living, cosmopolitan ciliates that are adapted to a particular habitat.

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Section: Introductionmentioning

confidence: 99%

Local adaptation among geographically distant clones of the cosmopolitan freshwater ciliate Meseres corlissi. II. Response to pH

Weisse

Scheffel²,

Štádler³

et al. 2007

Aquat. Microb. Ecol.

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“…Considerable growth rate differences with respect to temperature have already been demonstrated within the same ciliate genus (Lee & Fenchel 1972, Perez-Uz 1995. In spite of these findings, the potential significance of species-specific physiological differences has been ignored in many ecological investigations.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on inter- and intraspecific isolates of Urotricha (Prostomatida, Ciliophora)

Weisse

Montagnes²

1998

Aquat. Microb. Ecol.

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ABSTRACT. Ecological models often presume that all members of a functional gulld, e.g. herbivorous cil~ates, respond ident~cally to temperature changes. To test this general assumption, w e Investigated lf planktonic ciliates withln the genus Urotncha exhibit distinct inter-and intraspecif~c responses to temperature. We examined the response of growth rate, cell volume, and production to changing temperature, using 6 temperatures between 5 and 30°C. This experiment made 3 comparisons uslng: (1) different species isolated from the pelaglc and littoral regions of the same lake; (2) different clones of the same species isolated from lakes of the similar trophic status, but different latitudes, and (3) different clones of the same species isolated from the pelagic region of a single lake Using ANCOVA a n d ANOVA procedures (a = 0.05) to examine the data w e demonstrated that. (1) clllate species within a slngle genus may exhibit distinct responses to temperature, suggesting that treating ciliates as a single funct~onal group is an oversimplification; (2) clones isolated flom a laboratory culture of a slngle species, isolated from a single locdlion, differ only to a small extent; and (3) clones Isolated from different localities, but b e l o n g~n g to the same species differ considerably in their responses. Our data indicate that (1) temperature regimes may be an environmental mche that separates species and clones and (2) even where apparent morphological and molecular differences do not distinguish taxa, functlonal differences may still exist.

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“…Hoare 1927, Kahl 1931 whereas others have suggested that they be retained as separate species on the basis of their occurrence in freshwater and marine habitats respectively (Thompson & Evans 1968). However, U. nigricans has been recorded from both freshwater and marine habitats and various isolates have exhibited good growth in brackish and seawater (Perez-Uz 1995). Pending further characterization studies, we regard them to be separate species on the basis of their morphological differences and do not consider them to be restricted to speciflc habitats.…”

Section: R Ventralmentioning

confidence: 99%

Fatal encephalitis due to the scuticociliate Uronema nigricans in sea-caged, southern bluefin tuna Thunnus maccoyii

Munday¹,

O'Donoghue²,

Watts³

et al. 1997

Dis. Aquat. Org.

109

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A syndrome characterized by atypical swimming behaviour followed by rapid death was first reported in captive southern bluefin tuna Thunnus maccoyii (Castelnau) in the winter of 1993. The cause of this behaviour was found to be a parasitic encephalitis due to the scuticociliate Uronema nigricans (Mueller) Based on parasitological and histological findings, it is proposed that the parasites initially colonise the olfactory rosettes and then ascend the olfactory nerves to eventually invade the brain. Possible epidemiological factors ~nvolved in the pathogenesis of the disease include water temperature (<18"C) and the immune status of the fish.

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Growth rate variability in geographically diverse clones of Uronema (Ciliophora: Scuticociliatida)

Cited by 25 publications

References 40 publications

Local adaptation among geographically distant clones of the cosmopolitan freshwater ciliate Meseres corlissi. II. Response to pH

Local adaptation among geographically distant clones of the cosmopolitan freshwater ciliate Meseres corlissi. II. Response to pH

Effect of temperature on inter- and intraspecific isolates of Urotricha (Prostomatida, Ciliophora)

Fatal encephalitis due to the scuticociliate Uronema nigricans in sea-caged, southern bluefin tuna Thunnus maccoyii

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