Tag: "mating" at biology news
Study in Royal Society journal on first observation of giant squid in the wild
...males to father most of the offspring, probably by mating
with females after their young have flown, but before swarming. This may give their sperm the first class accommodation in the oviduct through the winter. Contact: Professor JD Altringham, School of Biology, University of Leeds, LEEDS, LS2 9JT A can...
Looks matter to female barn swallows
... 30, 2005). "The bad news for male swallows is the mating
game is never over," said lead author Rebecca Safr.... Although many previous studies have investigated mating
patterns in birds and other animals, this is the first study of its kind to meticulously rule out bi...
Same-sex mating by fungi spawned infection outbreak, evidence suggests
DURHAM, N.C. Same-sex mating
between two less harmful yeast strains might have ...is of fungal samples, the researchers suggest that mating
between two less harmful fungal strains of the same sex or "mating type" produced the more virulent ...
Multiple genes permit closely related fish species to mix and match their color vision
...l as the prominent role of nuptual coloring in the mating
preferences of these species, the cichlids offer a unique opportunity to study how color vision can undergo change in rapidly evolving species. For example, because color plays a significant role in mate choice, differences in color vision could grea...
Sperm trading can resolve hermaphrodite mating conflicts
By directly manipulating mating
performance in a tropical sea slug, Chelidonura hi...me hermaphroditic species, such as C. hirundinina, mating
partners may insist on copulating as a "male," "female," or both, resulting in unique biological con...
Rapid genomic and physiological responses for social dominance
For many animals, possibly even for humans, mating
success is determined by social status or dominance. A male's position in the "pecking order" - a term coined by the Norwegian Thorleif Schjelderup-Ebbe, who first proposed the concept of social dominance based on his work with chickens - can actuall...
In Western bluebird as well as human families, accumulated wealth encourages stability
...aloguing the mistletoe resources available in each mating
pair's territory, and during the spring of 2003, she and McGowan removed mistletoe from 13 territories - a Herculean task requiring weeks of tree climbing and trimming. In contrast to the situation on 13 undisturbed territories, she noticed that sons...
Picky female frogs drive evolution of new species in less than 8,000 years
...og, which are what females pay attention to in the mating
game, had become different from each other. Yet de...there may have been selection pressure to evolve a mating
strategy to minimize dead-end mating
with northern males. This appears to have occurred in the conta...
Olfactory input dominates reproductive behavior in mice
...ng and processing the bodily chemicals that govern mating
behavior. The unexpected finding may settle an ong...el. By injecting fluorescently marked virus into a mating
center in the mouse hypothalamus -- a collection of neurons that produce luteinizing hormone-releasi...
Olfactory system detects pheromones that control reproduction
...hers have discovered that pheromones essential for mating
behavior in mice are recognized by the nose and not by the vomeronasal system, as researchers had long suspected.The new studies demonstrate that the main olfactory epithelium, which was presumed to be mostly involved with the sense of smell, plays a...
Older female fish prefer imperfect male mates, study finds
...s also suggest that "females may not have the same mating
preferences throughout their lives," Morris said. ...e the question of whether there may be a change in mating
preference over time in other species as well. In a current study on human attraction, for example, ...
Surprise! Computer scientists model the exclamation point
...tional allocation is key to predation, escape, and mating
-- in short, to survival." According to the researchers, previous computational work on the problem has been phrased in the vocabulary of the stream of electronic data making up a video image, as a proxy for the much more complex mixture of sights, s...
Study in Royal Society journal on link between creativity and mating success
...B: Biological Sciences Schizotypy, creativity and mating
success in humans by Dr D Nettle and Ms HT Keenoo ...ually be evolutionarily advantageous by increasing mating
success. Contact: Dr D Nettle, Psychology, Brain and Behaviour, University of Newcastle, Henry Wellc...
Russian River coho recovery project seeing first hopeful signs of success
...n determine which male and female coho are optimal mating
partners. "If we didn't use this spawning matrix, we would probably end up spawningfish together that may be related at the level of siblings or half-siblings," Conrad said. "If we did this, we would still be able to produce fish, but we would be jeo...
New study examines how sense of smell affects mating and aggression in mice
...tion is a key step in regulating behaviors such as mating
and aggression. The new study findings show, howev...itherto unsuspected role for the MOE in regulating mating
and aggressive behavior in mice. He adds that while it appears humans do not have an intact VNO, the...
Male elephants woo females with precise chemistry
...th influences both a female elephant's interest in mating
and how other surrounding elephants behave, a new study has found. The researchers at Oregon Health & Science University and the University of Auckland in New Zealand say the release of a specific proportion of two mirror images of the pheromone, fr...
Females, alcohol and hormones
...e estrous cycle, which corresponds to the onset of mating
behavior) and diestrous (the last phase of the estrous cycle) states. "We know that females are affected by alcohol differently than males," said Swartzwelder, "but unlike many studies, this one shows a way in which females are less sensitive tha...
New study explores beetle species with two forms of females
...ures, behaviors, chemicals, etc.) for control over mating
may take place over evolutionary time, which in th...opulations where sexual conflict characterizes the mating
system," write the authors. "It also affects our theoretical expectations of sexual conflict as a sp...
Pesticide combinations imperil frogs, probably contribute to amphibian decline
... size of their vocal organs, which are critical to mating
success, and causing a tenfold drop in testosterone in mature male frogs. In the current study, he looked again at atrazine as well as three other herbicides, two fungicides and three insecticides used on Midwestern cornfields - a subset of more than...
Experimental evolution of yeast in the lab may illuminate early events in speciation
...lly mixed groups (populations) of the species from mating
with each other. But what sorts of genetic barrier...reate a selective force such that offspring from a mating
of two cells from the evolving population were selectively allowed to survive while offspring from a...
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