Tag: "mating" at biology news
Insects develop resistance to engineered crops
...at do not have resistance. The offspring of such a mating
will be susceptible to the toxins. "Having a refuge is a good management strategy, but it is not suitable for small farmers in China and India," said lead author Jian-Zhou Zhao, a senior research associate in entomology at Cornell. "The two-gene stra...
Study in Royal Society journal on holly as an indicator of climate change
...gree with the notion that females invest more when mating
with higher quality partners. It also suggests that females bias the sex ratio towards the sex most susceptible to genetic inviabilities (such as colour blindness and muscular dystrophy in humans) only when partners are of particularly high genetic q...
Female butterflies go for sparkle -- not size -- when choosing to mate
...ales and then studied how they influenced female's mating
decisions. "It's very easy to change the size, col...l side appeared to have any affect on the females' mating
decisions, leading the researchers to conclude that the ventral side of the wing does not play a rol...
How fish hear and make sounds at same time
... end up fertilizing several thousand eggs. During mating
season, houseboat owners in San Francisco Bay have complained that their homes vibrate from the humming fish, which sound like a high-speed motor running underwater. Co-author Matthew Weeg received his doctorate from Cornell and worked in Andrew Bas...
Secret sex life of killer fungus?
...showed that some key genes involved with detecting mating
partners were active in the fungus. Taken as a whole, the study's results indicate that the fungus has a recent evolutionary history of sexual activity and might still be having sex, if thus far unseen by human eyes. These results are important becau...
Meaningless sex? Male mounting reduces sexual promiscuity of females
...ecially evident in the realm of mate selection and mating
behavior. A puzzling behavior frequently observed ...avoid sperm competition by preventing females from mating
with other males. However, previous studies have not fully considered the possibility that female pr...
Study in Royal Society journal on world's only horned rodent
...ale fewer of their eggs were fertilised than those mating
with groups of males. We also showed that females ... battle between the sexes over the ideal number of mating
partners. Contact: Dr C Smith, University of Leicester, University Road, LEICESTER, LE1 7RH Geograp...
Expanding forests darken the outlook for butterflies, study shows
...onditions in the Canadian Rockies are stifling the mating
choices of butterflies in the region, say University of Alberta researchers. Smaller and less abundant alpine meadows--largely the result of human activities--are diminishing the alpine butterfly gene pool, creating a pattern that could lead to the ...
Study reveals new information on the direct and indirect mate choice in lekking animals
... behavioral mechanisms determine variation in male mating
success is important because different mechanisms ...rally located males or previously popular sites on mating
arenas (leks). The findings, which question the widespread beliefs about the lek mating
New study explores the evolution of male parental care and female multiple mating
Males enjoy larger reproductive success by mating
with many females, whereas the number of offspring per female does not increase by mating
with many males. Furthermore, males run the risk of investing in offspring of other males if they pr...
Extravagant but worthless gifts help a guy get the girl
...iving by males is a feature of human courtship and mating
systems in a number of species. Females invest mor...s: "We assumed that a male's expected pay-off from mating
with a female is positive. But it's greater if he finds her attractive, and then it's worth him stay...
Invasive honeysuckle opens door for new hybrid insect species
... are no longer any offspring of the original cross mating
around to investigate. So, Schwarz used a standard approach and looked at genetic markers in the brushy honeysuckle fly. He compared those markers with genes from other tephritid flies. He found that the blueberry and snowberry flies, because of t...
Behavioural ecologists elucidated how peahens choose their mates, and why
...vations to value male displaying activity and male mating
success. "Preferred males were those exhibiting the higher number of ocelli in the train, but surprisingly females seemed to prefer males with shorter tails. This was unpredictable because we also found that the longer the train, the more dominant th...
Weapon performance determines mating success in the collared lizard
In territorial species with polygynous mating
systems, reproductive success reflects phenotypic ...o size measure was correlated with any estimate of mating
success or with potential reproductive output. These results counter the conventional wisdom that bi...
New theory tests sex ratios under asymmetrical local mate competition among parasitoid wasps
...ing locally, and related males and females will be mating
with each other. To reduce this local mate competi...re of parasitised and unparasitised hosts, and the mating
environment will be influenced by wasps emerging from all the parasitised hosts, some related to eac...
Grasshopper love songs give insight into sensory tuning
...overlap with components of natural sounds found in mating
and mate-location calls. In their experiments, the...mmunication signals such as grasshopper or cricket mating
calls. They found that the OSEs of the receptors particularly matched characteristic features of spe...
Two new lemur species discovered
...arge testes, which are suggestive of a promiscuous mating
system. "Zaza" is the Malagasy word for "child" or "children." This name was chosen because the new species is the smaller of the two Mirza species. Also, with this name the new lemur is dedicated to Madagascar's children, to remind them of their ...
Human Y chromosome stays intact while chimp Y loses genes
...ely reason for such disparity is due to chimpanzee mating
habits. "Contrary to the dire predictions that hav...enes on the chimpanzee Y may be due to the chimp's mating
habits. Both male and female chimps engage with multiple partners when they mate. This gives a stron...
Human Y chromosome preserves itself better than the chimp Y
... of these testis-expressing genes." As part of the mating
game, chimpanzees make much more sperm than humans do, so their testes need to be operating at high capacity. As a result of the newest research, Page added, "we can also draw some inferences about that common ancestor" shared by humans and chimps so...
Study in Royal Society journal on possiblity of human organ regeneration
...l Sciences Females use self-referent cues to avoid mating
with previous mates by Professor SK Sakaluk, Ms TM...sts. However, recent studies have revealed that by mating
with more than one male, females may obtain particularly "good" genes that enhance the prospects of ...
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