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

Weisse, Thomas; Scheffel, Ulrike; Štádler, P; Foissner, Wilhelm

doi:10.3354/ame047289

Cited by 22 publications

(23 citation statements)

References 17 publications

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“…Accordingly, the Chinese clone was different from the Austrian clones AU5 and AU6 and the Australian clone in size‐related or numerical characters. Ecologically, the Chinese clone was clearly separated from all other clones (our Results, details reported by Gächter and Weisse 2006; Weisse et al 2007). The intraspecific ecological variation was as large as differences observed between ciliate species under comparable laboratory conditions as used in our study (Weisse 2006).…”

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confidence: 52%

“…Ecophysiological variation. Significant differences between populations of M. corlissi have already been reported for the temperature response of nine clones (Gächter and Weisse 2006) and for the pH response of five clones (Weisse et al 2007). Major results are summarized in Table 7 for the five M. corlissi clones that were investigated in both previous studies.…”

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confidence: 90%

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Genetic, Morphological, and Ecological Diversity of Spatially Separated Clones of Meseres corlissi Petz & Foissner, 1992 (Ciliophora, Spirotrichea)

Weisse

Strüder‐Kypke

Berger³

et al. 2008

J Eukaryotic Microbiology

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We investigated the intraspecific variation of the spirotrich freshwater ciliate Meseres corlissi at the level of genes (SSrDNA, ITS), morphology (14 characters), and ecophysiology (response to temperature and pH). Five of the eight clonal M. corlissi cultures isolated from five localities on four continents were studied at all levels. The null hypothesis was that geographic distance plays no role: M. corlissi lacks biogeography. The intraspecific variation was low at the genetic level (0%-4%), moderate at the morphological level (5%-15%), and high at the ecophysiological level (10%-100%). One clone, isolated from subtropical China, differed significantly at all levels from all other clones, suggesting limited dispersal and local adaptation among M. corlissi. However, other clones from distant areas, such as Australia and Austria, were genetically identical and differed only slightly in morphology and temperature response. We speculate that our findings may be typical for rare species; the chances may be equally high for both global dispersal of most and local adaptation of some populations in areas where dispersal has been permanently or temporarily reduced.

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confidence: 52%

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confidence: 90%

Genetic, Morphological, and Ecological Diversity of Spatially Separated Clones of Meseres corlissi Petz & Foissner, 1992 (Ciliophora, Spirotrichea)

Weisse

Strüder‐Kypke

Berger³

et al. 2008

J Eukaryotic Microbiology

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“…The modern morphometric techniques appeared to be sensitive tool for distinguishing subtle morphological differences between morphotypes of diatom strains traditionally assigned to a single species (rhode et al 2001, PaPPas & stoerMer Table 1. (Weisse et al 2007) and salinity (claVero et al 2000, fiNlay et al 2006, a few such studies were done in diatoms (schultZ 1971(schultZ , schMid 1976(schultZ , cox 1994 …”

Section: Discussionmentioning

confidence: 99%

Morphometric study of Navicula morphospecies (Bacillariophyta) with respect to diatom life cycle.

Veselá¹,

Neustupa²,

Pichrtová³

et al. 2009

Fottea

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Quantitative and qualitative variation in valve morphology in strains of Navicula cryptocephala and N. trivialis were examined using conventional valve measurements (length, width, striae density) and landmarkbased geometric morphometric method. The ability of morphometric techniques to distinguish individual strains on the basis of postinitial and/or sexually competent cells was assessed by multivariate analyses and permutation tests. The data showed that each strain had unique valve characters, which were shared by both large postinitial and small sexually competent cells. Landmarks representing central area and apical ends of the valves were primarily the most useful for discrimination between strains. The geometric morphometric techniques appeared to be enough sensitive to distinguish subtle morphological differences between Navicula morphospecies clonal cultures withouth any interference of diatom life cycle stage.

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“…Intraspecific differences were not only reported for growth and grazing rates of planktonic ciliates Pérez-Uz 1995;Weisse 2006), but they were also found in response to abiotic factors such as temperature and pH (Gächter and Weisse 2006;Weisse et al 2007). …”

Section: Adaptation Of Planktonic Ciliatesmentioning

confidence: 99%

Ciliates in Planktonic Food Webs: Communication and Adaptive Response

Weisse

Sonntag

2016

Biocommunication of Ciliates

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Ciliates are key elements of aquatic food webs, acting as predators of bacteria, algae, other protists and even some metazoans. Planktonic ciliates are important food for zooplankton, and mixotrophic and functionally autotrophic species may significantly contribute to primary production in lakes and in the ocean. Ciliates are linked to other plankton organisms and to abiotic parameters by various direct (e.g., predation and parasitism) and indirect (e.g., nutrient release via excretion, competition for food) interactions. Communication is involved in many of those interactions, but direct evidence from the field is scarce. This is mainly because aquatic ciliates live in a dilute environment and most species occur in low cell numbers. Key processes of chemical and hydromechanical communication among ciliates, between ciliates and their predators and prey, and between ciliates and their endosymbionts have been studied in some detail in vitro. Results from microcosm experiments suggest that ciliates also cooperate with each other and use information mediated by different other organisms. Extrapolating those results obtained in small-scale laboratory experiments to the ocean level is a major challenge for future research. To this end, more communication and cooperation is needed between cell biologists, ecologists, and evolutionary biologists. In contrast to communication, adaptations of natural ciliate populations to their abiotic and biotic environment have been well documented in selected freshwater and marine species. The effect of individual environmental variables and, less often, the interactive effect of several variables on growth and survival rates of ciliates have been studied with a number of ciliate species in the laboratory and inferred from their seasonal occurrence in the field. However, more information is needed on the autecology of free-living ciliate species and their role in the planktonic community. In particular, the significance of indirect ('lateral') effects in the food web received little attention and awaits future research.

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

Cited by 22 publications

References 17 publications

Genetic, Morphological, and Ecological Diversity of Spatially Separated Clones of Meseres corlissi Petz & Foissner, 1992 (Ciliophora, Spirotrichea)

Genetic, Morphological, and Ecological Diversity of Spatially Separated Clones of Meseres corlissi Petz & Foissner, 1992 (Ciliophora, Spirotrichea)

Morphometric study of Navicula morphospecies (Bacillariophyta) with respect to diatom life cycle.

Ciliates in Planktonic Food Webs: Communication and Adaptive Response

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