Pollen-Ovule Ratios and Hermaphrodite Sexual Allocation Strategies
نویسندگان
چکیده
منابع مشابه
Pollen histochemistry and pollen : ovule ratios in Zingiberaceae.
BACKGROUND AND AIMS Pollen grains of 37 species from 11 genera in the family Zingiberaceae were examined to assess qualitatively starch or lipid contents; the pollen grain and ovule numbers per flower and pollen : ovule ratios were also counted and calculated. Pollen : ovule ratios were studied to reveal patterns of variation in the Zingiberaceae. METHODS Freshly open flowers with dehiscing a...
متن کاملThe relationship between the pollen–ovule ratio and pollen size: another comparative test of a sex allocation hypothesis
Hypothesis: Sex allocation theory predicts that the pollen–ovule ratio should decrease linearly with increasing pollen size among seed plants (Charnov, 1982). Data examined: We retrieved data for pollen–ovule ratio, pollen size, pollen grain number, and mating system from published literature for 311 angiosperm plant species. Methods: We used model II regressions on cross-species data as well a...
متن کاملPollination mode and life form strongly affect the relation between mating system and pollen to ovule ratios.
Pollen to ovule (P : O) ratios have been hypothesized to correlate with the degree of outcrossing and thus with the mating system of a plant. Also, P : O ratios are likely to vary with respect to pollination mode (i.e. wind pollination or animal pollination). Furthermore, constraints on the evolution of mating systems depending on life form may affect P : O ratios. We compiled P : O ratios and ...
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Theory predicts that variation in body size within a population of simultaneous hermaphrodites should affect sex allocation, leading to individual differences in mating strategies and increased investment in female function with size. Small animals with fewer resources should invest proportionally more of their resources in male function than large animals, resulting in sperm displacement and p...
متن کاملQuantifying sexual conflict in a simultaneous hermaphrodite
Sexual encounters are usually accompanied by conflicts of interest between the mating partners. In animals with separate sexes such sexual conflicts can play a crucial role in the evolution of reproductive systems, and can even lead to speciation. Conflict arises when male strategies evolve that enhance the chances of fertilization, but at the same time reduce the reproductive potential of the ...
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ژورنال
عنوان ژورنال: Evolution
سال: 1984
ISSN: 0014-3820
DOI: 10.2307/2408447