Results 171 to 180 of about 3,096 (199)
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Sperm Competition Cannot Eliminate Protandry
Journal of Theoretical Biology, 1996Abstract Many butterfly species are protandrous, that is males emerge some time before the females. Models aiming to explain protandry generally assume that females mate only once, while males are capable of multiple matings. This assumption is not generally fulfilled, however.
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Journal of Cell Science, 1926
ABSTRACT Although in the accounts of the Teredinidae given by Caiman (1) and others it is stated that some species are reported to be hermaphrodite while in others the sexes are separate, so far as I have been able to discover the only species which up to the present has been shown to be hermaphrodite is Xylotrya gouldii.
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ABSTRACT Although in the accounts of the Teredinidae given by Caiman (1) and others it is stated that some species are reported to be hermaphrodite while in others the sexes are separate, so far as I have been able to discover the only species which up to the present has been shown to be hermaphrodite is Xylotrya gouldii.
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Polyandry and protandry in butterflies
Bulletin of Mathematical Biology, 1992zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Protandry of the flathead Suggrundus meerdervoortii (Teleostei: Platycephalidae)
Ichthyological Research, 2018Suggrundus meerdervoortii (Platycephalidae) has been hypothesized to pass through four phases, thus changing sex three times: the first male, first female, second male and second female phases. In this study, gonads of males and females were constructed from developed testis with an immature ovary and only oocytes, respectively.
Toshiaki Shitamitsu, Tomoki Sunobe
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Plasticity of gonadal development and protandry in fishes
Journal of Experimental Zoology, 1992AbstractSexual differentiation in eutherian mammals follows a simple governing paradigm: development proceeds in a female direction unless a masculinizing mechanism intervenes. Sexual development in fishes is much more plastic than in mammals. It permits the intervention of environmental factors and follows several different types of sequences that ...
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Protandry, sexual selection and climate change
Global Change Biology, 2004AbstractProtandry refers to the earlier appearance of males before females at sites of reproduction. Sexual selection has been hypothesized to give rise to sex differences in benefits and costs of early arrival, thereby selecting for earlier appearance by the sex subject to more intense sexual selection.
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Andromonoecism, protandry, and sexual selection in Umbelliferae
New Zealand Journal of Botany, 1981Abstract Most Umbelliferae are protandrous and andromonoecious with hermaphrodite flowers concentrated in earlier opening umbellets and umbel orders. When weakly developed: protogyny is more effective than protandry in promoting outcrossing, yet is uncommon.
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Protandry and female size-fecundity variation in the tropical butterfly Brassolis sophorae
Oecologia, 1998Protandry (the emergence of males before females) is currently explained either as a mating strategy to maximize number of matings in the males, or a way to minimize pre-reproductive mortality in females. Models of protandry have generally ignored variation in female quality (reproductive potential).
Carvalho, M. C. +2 more
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Models on butterfly protandry: Virgin females are at risk to die
Theoretical Population Biology, 1991Current models on protandry in butterflies assume that females are mated instantaneously upon eclosion. However, for most butterfly species this assumption is not realistic. In this paper a model is formulated in which the mating rate depends on both male and female density.
Zonneveld, C., Metz, J. A. J.
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Models for the evolution of protandry in insects
Theoretical Population Biology, 1983Abstract Protandry is the tendency for males to emerge before females, and it is common in insects with discrete, nonoverlapping generations in which females mate once only soon after emergence. In these circumstances males which emerge early will have more opportunities to mate than those which emerge late, so that protandry would be expected to ...
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