SEXUAL REPRODUCTION IN STEPHANODISCUS NIAGARAE (BACILLARIOPHYTA)1
نویسندگان
چکیده
منابع مشابه
Observations on the Valve Morphology of Stephanodiscus Niagarae
Stephanodiscus niagarae Ehr. was studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Material for study was collected from Green Bay, Lake Michigan, Wisconsin, and Yellowstone Lake, Wyoming. Features of the valve visible in light microscopy (LM) but best defined by SEM and TEM include spines, arrangement of marginal and central strutted processes, labiate p...
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Stephanodiscus niagarae populations in a core from Lake Ontario show systematic variation in radial puncta number and mean valve diameter. Puncta number is stable in specimens from samples deposited between 1720 and 1844. Puncta number gradually increases in samples deposited between 1860 and 1947, then increases rapidly to high numbers in samples deposited after 1964. Mean valve diameter is re...
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For octocorals, sexual reproductive processes are fundamental to maintaining populations and influencing macroevolutionary processes. While ecological data on octocorals have lagged behind their scleractinian counterparts, the proliferation of reproductive studies in recent years now enables comparisons between these important anthozoan taxa. Here we review the systematic and biogeographic patt...
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Aspergillus flavus is the major producer of carcinogenic aflatoxins in crops worldwide and is also an important opportunistic human pathogen in aspergillosis. The sexual state of this heterothallic fungus is described from crosses between strains of the opposite mating type. Sexual reproduction occurred between sexually compatible strains belonging to different vegetative compatibility groups. ...
متن کاملEffects of Sexual Reproduction
Example 5.5: Near-critical binary splitting. The theorem applies to binary splitting where the probability of division is p(z) = 1/2+1/(2z), and q(z) = 1− p(z) is the probability of no children, if population size is z. Thus, m(z) = 1 + 1/z and the process is supercritical, but approaches criticality as z increases. The probability generating function of the offspring number is fz(s) = q(z) + p...
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ژورنال
عنوان ژورنال: Journal of Phycology
سال: 1991
ISSN: 0022-3646,1529-8817
DOI: 10.1111/j.0022-3646.1991.00780.x