Results 151 to 160 of about 161,421 (174)
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Biological Journal of the Linnean Society, 1992
Antliarhinus zamiae (Thunberg) and A. signatus Gyllenhal are the only insects known in which the larvae feed exclusively on the cycad gametophyte. In their host plants, species of the cycad genus Encephalartos (Zamiaceae), the gametophyte is protected by a three-layered integument and substantial sporophyll tissues.
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Antliarhinus zamiae (Thunberg) and A. signatus Gyllenhal are the only insects known in which the larvae feed exclusively on the cycad gametophyte. In their host plants, species of the cycad genus Encephalartos (Zamiaceae), the gametophyte is protected by a three-layered integument and substantial sporophyll tissues.
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Pregnancy sickness as an adaptation to concealed ovulation.
Rivista di biologia, 1995The hypothesis that pregnancy sickness has evolved to expel dietary toxins (PROFET, 1988; 1992; HOOK, 1976) is critically reviewed. Instead it is proposed that pregnancy sickness and mastalgia have evolved to reduce frequency of sexual intercourse in early pregnancy.
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2006
Most mammalian females engage in sexual activity during distinct periods of receptivity termed estrus, which coincides with the period of fertility. Sexual activity in human females, however, is characterized by the absence of specific times of receptivity or proceptivity, and by the lack of advertised fertility (via either behavioural or physical cues)
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Most mammalian females engage in sexual activity during distinct periods of receptivity termed estrus, which coincides with the period of fertility. Sexual activity in human females, however, is characterized by the absence of specific times of receptivity or proceptivity, and by the lack of advertised fertility (via either behavioural or physical cues)
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2019
With three studies, a long lived position that women have concealed ovulation, and its possible adaptive value were investigated. In the first study, systematic changes in women across the menstural cycle were elaborated and of those, cyclic changes in the facial symmetry in regularly ovulating women were investigated.
Cetinkaya, Hakan +2 more
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With three studies, a long lived position that women have concealed ovulation, and its possible adaptive value were investigated. In the first study, systematic changes in women across the menstural cycle were elaborated and of those, cyclic changes in the facial symmetry in regularly ovulating women were investigated.
Cetinkaya, Hakan +2 more
openaire +1 more source
Adaptive Human Behavior and Physiology, 2023
Lisa L. M. Welling, Alex C. Orille
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Lisa L. M. Welling, Alex C. Orille
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Demographic Evidence That Human Ovulation Is Undetectable (At Least in Pair Bonds)1
Current Anthropology, 2005A. Brewis, Mary C. Meyer
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