sperm competition
Polyandry and sperm competition in the alternative reproductive tactics in Chinook salmon (Oncorhynchus tshawytscha)
... sperm competition. Those models assume that there is a difference in sperm competition risk and perception of such risk between the two alternative ...high sperm competition risk ...
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Mate choice and sperm competition in the redside dace (Clinostomus elongatus)
... to sperm success because faster sperm cover more distance per unit time, indicating that more egg contacts are made per unit ...teleost sperm to enter an egg using the micropyle, a channel through ...
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Postmating–prezygotic isolation between two allopatric populations of Drosophila montana : fertilisation success differs under sperm competition
... affect sperm viability and crickets that invest in high viability ejaculate can enhance the viability of rival sperm (Simmons and Beveridge ...the sperm of another ...to sperm ...
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The heritability of mating behaviour in a fly and its plasticity in response to the threat of sperm competition.
... rivals are beneficial in terms of number of offspring [23]. There are also benefits to responding to a rival in D. melanogaster [59], and the complex cue system required for this response suggests that avoiding an ...
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Sperm Competition and the Dynamics of X Chromosome Drive: Stability and Extinction
... of sperm competition in populations polymorphic for a driving X chromosome have revealed that Sex-ratio males (those carrying a driving X) are at a disadvantage relative to Standard ...of sperm ...
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Sperm competition risk drives plasticity in seminal fluid composition
... of sperm competition risk influence seminal fluid proteome ...of sperm competition risk are of particular ...formation, sperm transport and sperm motility (reviewed in [42, 45]), ...
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A histological comparative study on sperm competition inside the spermathecae in the grasshopper species, Dichromorpha viridis and Chortophaga viridifasciata (Orthoptera: Acrididae)
... avoid sperm competition while a female is still receptive (Parker ...leave sperm plugs in the females’ genital tract that act as mechanical barriers to subsequent spermatophore deposition by other ...
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Audience effects in the Atlantic molly (Poecilia mexicana)–prudent male mate choice in response to perceived sperm competition risk?
... of sperm com- petition ...under sperm competition ...perceived sperm competition risk even if no rival observes them directly during mate ...
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Bayesian Sperm Competition Estimates
... from the posterior of ␣ and  for the Ravenswood data. data set with a single (more polymorphic) locus. Allele frequencies were estimated for the data set as described in methods; it is worth noting that if one of helps ...
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The influence of sperm competition and life-history traits on brain size evolution in male and female birds
... One notable difference between passerines and non-passerines is the development and production of song. Most passerines learn their song, whereas the songs of most non- passerines are innate, with some exceptions ...
126
Sperm competition and male forceps dimorphism in the European earwig Forficula auricularia (Dermaptera: Forficulina)
... of sperm transfer is of key interest to understanding the mechanism of sperm ...competition. Sperm removal in damselflies is an outstanding example of this; breaking copulating pairs in a time ...
145
Sperm competition and the alternative reproductive tactics of Chinook salmon (Oncorhynchus tshawytscha)
... of sperm competition to predict the different sperm investment patterns observed in species with alternative reproductive ...face sperm competition risk owing to the fact that they ...
107
Social Cues of Future Sperm Competition Received during Development Affect Learning in Adult Male Fruit Flies, Drosophila melanogaster
... Due to the differences in experimental setup, we cannot directly compare between the density and adult presence social environments, but taking both sets of results into consideration, it appears that the type of cues ...
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Thomsen, Ruth (2001): Sperm Competition and the Function of Masturbation in Japanese Macaques (Macaca fuscata). Dissertation, LMU München: Fakultät für Biologie
... to sperm competition are evident in ...of sperm competition is that of mate-guarding to prevent the female from mating with competitors (Berard et ...rival sperm from the females’ ...
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Sperm mobility determines the outcome of sperm competition in the domestic fowl
... di¡erential sperm use all suggest that the e¡ect is mediated by genetic compatibility or incompat- ibility between sperm and the female reproductive tract (Markow 1997; Birkhead 1998c; Clark & Begun ...
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Implications of diversity in sperm size and function for sperm competition and fertility
... ABSTRACT Sperm competition is now recognised as a potent selective force shaping many male reproductive ...of sperm competition on sperm number is widely accepted, its effects upon ...
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Sperm Competition in the Absence of Fertilization in Caenorhabditis elegans
... parallel to control for variables such as food quality, the steady- spermatozoa lose access to receptive oocytes. Finally, state temperature of incubators, the general health of worm the sperm competition ...
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A proteomic study of sperm competition in mammals
... in sperm (Koyama and Kamimura 1998; 2000; Liljedal and Folstad 2003; Pizzari, Cornwallis et ...of sperm competition theory; that disadvantaged subordinate males should compensate by increasing ...
267
Sexual selection and sperm competition in the guppy ( Poecilia reticulata)
... populations of Poecilia reticulata in relation to predation intensity. An asterisk indicates.. fb) Mean (±SE) sperm midpiece length across 1 1. populations of P reticulata paired by r[r] ...
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SPERM COMPETITION AND SPERM LOSS IN DROSOPHILA MELANOGASTER FEMALES FERTILIZED BY YSX·YL/0 MALES
... Expt.. As Figure 1 shows, after the third or fourth day following deposition, almost all the y values are above 100; the phenomenon is general in nearly all the females examined. In [r] ...
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