Genetic differentiation and amount of genetic variability in natural populations of the haploid laver Porphyra yezoensis.

GENETIC VARIABILITY OF GELIDIUM CANARIENSIS (RHODOPHYTA) DETERMINED BY ISOZYME ELECTROPHORESIS1

“…Cheney and Babbel (1978) reported high genetic differentiation in populations of Eucheuma nudum (= E. isiforme var, denudatum Cheney) from Florida populations, suggesting that a combination of selective forces and/or genetic drift coupled with genotypic differences originally present were the cause for the differentiation. High genetic differentiation was also found among Japanese populations of Porphyra yezoensis, with the genetic differentiation among gametophytic populations higher than that of other diploid organisms (Miura et al 1979, Fujio et al 1985, 1987. Similar results showing a higher genetic differentiation among gametophytic subpopulations than among sporophytic subpopulations were reported by Sosa and Garcia-Reina (1 992) for three locations of Gelidium arbuscula from the Canary Islands.…”

PATTERNS OF REPRODUCTION, GENETIC DIVERSITY, AND GENETIC DIFFERENTIATION IN CALIFORNIA POPULATIONS OF THE GENICULATE CORALLINE ALGA LITHOTHRIX ASPERGILLUM (RHODOPHYTA)1

“…With the exception of some wild haploid populations of Porphyra yezoensis from Japan (Miura et al 1979, Fujio et al 1985, A/L, %P, and He for sexually reproducing subpopulations and populations of L. aspergillurn from Laguna Beach are higher than values for other red algal species and only slightly less than those reported for sexual populations of the brown alga Halidrys dioica (Lu and Williams 1994), a dioecious obligate outcrosser with floating reproductive fronds that facilitate longrange dispersal.…”

“…Lu and Williams 1994Williams and DiFiori, 1996Cheney and Babbel 1978Cheney and Babbel 1978Sosa and Garcia-Reina 1992Sosa and Garcia-Reina 1992Sosa and Garcia-Reina 1993Sosa and Garcia-Reina 1993Sosa et al 1996Intasuwan et al 1993 This study This study This study Cheney and Babbel 1978Fujio et al 1985Fujio et al 1987Miura et al 1979Miura et al 1979 dega Bay was much lower than the diversity of sexually reproducing diploid populations from southern California. Asexual reproduction, including vegetative propagation, has previously been hypothesized to contribute to the low levels of genetic diversity reported for natural populations of Codium frugib spp.…”

“…The few available studies performed on seaweeds have relied on gel electrophoresis to analyze enzyme polymorphisms within and among p o p ulations (Malinowski 1974, Cheney andBabbel 1978, Miura et al 1979, Innes and Yarish 1984, Fujio et al 1985, Innes 1987, 1988, Sosa and GarciaReina 1992, Intasuwan et al 1993, Lindstrom 1993, Neefus et al 1993, Lu andWilliams 1994, Sosa et al 1996, Williams and Di Fiori 1996). This previous research has established the usefulness of protein electrophoresis for studies of the population genetics of marine macroalgae.…”

Allozyme variation in New ZealandPorphyra(Rhodophyta)

“…35 Two general patterns of allozyme variation have been documented for Porphyra: one with a high A/ L ratio as found in Japan (Miura et al 1979;Fujio et al 1985Fujio et al , 1987 ranging from 1.0 to 1.9 and the other with a much lower ratio as found in westem North America (Lindstrom 1993). The high A/L ratios of Japanese Porphyra were ascribed to life cycle and low chromosome number though Lindstrom (1993) suggested that the causal factor may have been that more than one species was included in their studies.…”