Pacific Science, Volume 61, Number 4, 2007

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    Index to Volume 61 : Subject Index
    (Honolulu, University of Hawaii Press, 2007-10)
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    Index to Volume 61 : Author Index
    (Honolulu, University of Hawaii Press, 2007-10)
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    Association Affairs
    (Honolulu, University of Hawaii Press, 2007-10)
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    Checklist of Pacific Operculina (Convolvulaceae), Including a New Species.
    (Honolulu, University of Hawaii Press, 2007-10) Staples, G.W.
    A new species of Operculina (Convolvulaceae), O. polynesica Staples, is described from the Pacific. This brings to five the number of species known from Micronesia, Melanesia, and Polynesia. A key for identification is provided, nomenclature and distributions are summarized, and a list of specimens examined is included to aid herbarium curators in naming Pacific material.
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    Vegetative and Reproductive Variability of Dictyota crenulata (Phaeophyta: Dictyotales) along the Central and Southwestern Gulf of California, Mexico.
    (Honolulu, University of Hawaii Press, 2007-10) Altamirano-Cerecedo, Maria del Carmen ; Riosmena-Rodriguez, Rafael
    Dictyota crenulata J. Agardh is widely distributed throughout the Gulf of California. Comparative analyses of morphology, anatomy, and reproductive features of this species were conducted along the central western and southwestern regions of the Gulf of California. Thalli showed geographical variations in length and apical width. No differences were observed in anatomy of vegetative thalli or relative abundance of reproductive structures. Dictyota crenulata had unilayered or multilayered medullas in the basal region and in proliferations. Most thalli presented unilayered medullas in the middle section. Our observations indicate that number of medullary layers is indeed a phenotypically plastic character, in agreement with previously published results. Variations in thallus morphology such as proliferations and length are likely the result of environmental differences, also reflected in the reproduction of D. crenulata. The southwestern region had the highest percentage of all life cycle stages (female gametophytes and sporophytes, both 22%, and vegetative thalli, 14%). Our results demonstrate morphological variability in Dictyota crenulata across its distribution in the Gulf of California.