Inter- and intraspecific variation in pollen size inAsphodelussectionAsphodelus(Asphodelaceae)
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چکیده
منابع مشابه
Sex-specific selection and intraspecific variation in sexual size dimorphism.
Sexual size dimorphism (SSD) is thought to evolve due to sex differences in selection on body size, but it is largely unknown whether intraspecific variation in SSD reflects differences in sex-specific selection among populations. We addressed this question by comparing viability selection between two island populations of the brown anole lizard (Anolis sagrei) that differ in the magnitude of m...
متن کاملInter‐ and intraspecific variation in body‐ and genome size in calanoid copepods from temperate and arctic waters
The tendency of ectotherms to get larger in the cold (Bergmann clines) has potentially great implications for individual performance and food web dynamics. The mechanistic drivers of this trend are not well understood, however. One fundamental question is to which extent variation in body size is attributed to variation in cell size, which again is related to genome size. In this study, we anal...
متن کاملA method to estimate pollen viability from pollen size variation.
The mean diameter of viable pollen grains is approximately 13 μm greater than the mean diameter of inviable grains in Mimulus guttatus. We show that this difference is large enough to be detected by particle counters and that these machines can be used to obtain a rapid estimate of pollen viability. While requiring a separate calibration, a size-based statistic is also strongly correlated with ...
متن کاملEffects of intraspecific competition on size variation and
Clonal plants grow in diameter rather than height, and therefore competition among genets is likely to be symmetric and to result in smaller variation in size of genets than in non-clonal plants. Moreover, clonal plants can reproduce both sexually and vegetatively. We studied the effects of density on the size of rosettes and of clones, variation in the size of rosettes and of clones, and alloc...
متن کاملCauses of intraspecific variation in body size among trematode metacercariae.
Inequalities in body size among adult helminths can result in inequalities in reproductive output, with consequences for population dynamics and genetics. These inequalities can result from growth differences among larval worms inside intermediate hosts that persist into the adult stage. Here, we investigate the effects of both host body size and intensity of infection on the sizes of metacerca...
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ژورنال
عنوان ژورنال: Grana
سال: 1996
ISSN: 0017-3134,1651-2049
DOI: 10.1080/00173139609429479