منابع مشابه
Female gamete competition in an ancient angiosperm lineage.
In Trimenia moorei, an extant member of the ancient angiosperm clade Austrobaileyales, we found a remarkable pattern of female gametophyte (egg-producing structure) development that strikingly resembles that of pollen tubes and their intrasexual competition within the maternal pollen tube transmitting tissues of most flowers. In contrast with most other flowering plants, in Trimenia, multiple f...
متن کاملGamete evolution and sperm numbers: sperm competition versus sperm limitation.
Both gamete competition and gamete limitation can generate anisogamy from ancestral isogamy, and both sperm competition (SC) and sperm limitation (SL) can increase sperm numbers. Here, we compare the marginal benefits due to these two components at any given population level of sperm production using the risk and intensity models in sperm economics. We show quite generally for the intensity mod...
متن کاملLocal gamete competition explains sex allocation and fertilization strategies in the sea.
Within and across taxa, there is much variation in the mode of fertilization, that is, whether eggs and/or sperm are released or kept inside or on the surface of the parent's body. Although the evolutionary consequences of fertilization mode are far-reaching, transitions in the fertilization mode itself have largely escaped theoretical attention. Here we develop the first evolutionary model of ...
متن کاملGamete compatibility and sperm competition affect paternity and hybridization between sympatric Asterias sea stars.
Gamete interactions may strongly influence speciation and hybridization in sympatric broadcast-spawning marine invertebrates. We examined the role of gamete compatibility in species integrity using cross-fertilization studies between sympatric Asterias sea stars from a secondary contact zone in the northwest Atlantic. In crosses between single males and single females, gametes of both species w...
متن کاملAppendix B from J . M . Henshaw et al . , “ Local Gamete Competition Explains Sex Allocation
In the robustness analysis, we generated parameter values randomly for each trial. Here we present the range of values from which each parameter was chosen (table B1). We also justify our choice of ranges for scaling exponents. These exponents determine the allometric relationships between body size, population density, and pumping ability and between egg size and fertilization efficiency. Last...
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ژورنال
عنوان ژورنال: The American Journal of Human Genetics
سال: 2000
ISSN: 0002-9297
DOI: 10.1086/302826