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- W1660680480 abstract "Chronic copper toxicity was found to result in growth hormesis in bothC. hvalina and E. pilosa. Tolerance levels of the bryozoans to copper contaminationwere found to be high in comparison with those of other marine organisms.Generally, both genotype and copper dosage affected growth and sexual functions,but genotype had no affect on organism response to copper. Nonetheless, largedifferences in responses were detected between the two E. pilosa populationsexamined.Variation in tentacle number of C. hyalina colonies was found to be verylimited and dietary regime was not observed to have a marked influence upon thistrait. In contrast, colonies of E. pilosa were found to produce more tentacles perlophophore in optimal dietary conditions. Significant differences were detectedbetween two E. pilosa populations in astogeny, sexual maturity and tentacle number.Laboratory experiments designed to identify the cue for induction of extended(long) medium proximal spines in E. pilosa colonies were unsuccessful. Differencesin spine growth were again identified between the two E. pilosa populations fromcontrasting sites. Reciprocal transplantation demonstrated that `long' spine formationwas triggered in colonies previously possessing only `short' spines and vice versa.Flume observations of particle path trajectories imply that spine formation may resultin near-colony flow conditions which are more favourable to feeding in high flowvelocities.Demographic analysis using the RAPD technique for both C. hyalina andE. pilosa indicate population structuring corresponding to their contrasting modes oflarval dispersal. Populations of C. hyalina appear to exhibit considerable geneticdifferentiation over distances as small as 100 m, whereas E. pilosa is characterised byhigh levels of genetic heterogeneity over much larger spatial scales. E. pilosapopulation differentiation is observed at a site some 80 Km distance, which may be aconsequence of hydrographic features.Evidence from analysis of mtDNA (COI) and observations on reproductiveisolation and morphological differentiation indicate high levels of cryptic speciationamongst globally distributed populations of C. hyalina. It is suggested that theChilean C. hyalina population is sufficiently different from all other populationsexamined to be considered a separate species" @default.
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- W1660680480 date "1998-01-01" @default.
- W1660680480 modified "2023-09-27" @default.
- W1660680480 title "Genetic and phenotypic variation in two marine bryozoans." @default.
- W1660680480 hasPublicationYear "1998" @default.
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