Tag: "females" at biology news
Females may be more susceptible to overindulge 'sweet tooth' cravings than males
...se obesity avoidance tactics? Is it possible that females
are predisposed to succumb to the temptation to ov...hyperphagia was significantly greater in sedentary females
(35.7 3.1% increase), relative to sedentary males (9.1 2.2% increase). Wheel running decreased in...
$2.7 million grant to support creation of virtual zebrafish atlas
...have a rapidly developing, transparent embryo with females
producing about 200 eggs per week, giving researchers the quantity of offspring and the short life cycle needed to efficiently study how genetic malfunctions can lead to disease. As vertebrates, zebrafish provide a closer model for humans than yeast ...
European common frog found to use novel mating strategy
...e response to this so-called "clutch piracy." Many females
delayed release of their eggs until no other males...re releasing eggs. Vieites noticed, too, that some females
were releasing their eggs underneath other clutches to hide them from prowling males. The European c...
Sugar-coated sea urchin eggs could have sweet implications for human fertility
...her species, purple sea urchins are free spawners females
inject large clouds of eggs into the water and males do the same with sperm. Scientists found that the key to species-specific fertilization is a sperm protein called bindin connecting with the correct receptor in the plasma membrane on the surface o...
OHSU-VAMC study sheds light on estrogen's benefit for MS
...rly since these disorders occur more frequently in females
than in males. But the link between pregnancy and MS has been hotly debated. In 1998, scientists in France went a step closer to putting the issue to rest when they conducted the first large study aimed at assessing pregnancy and delivery on the cour...
Two warbler species find the West isn't big enough for both of them
...matings between the 'tough-guy' Townsend's and the females
of the 'wimpy' hermit species," Butler said. The ...er song and decoys, and males were captured before females
were present in the area or before the birds were socially mated. The researchers also worked in two...
Millennia still mean early days for newly identified sex chromosome
...h have a genetic sex-determination system in which females
are XX and males are XY. They provide evidence that even though the threespine stickleback Y chromosome is less than ten-million years old, it already has many hallmarks of a typical sex chromosome including poor homology with the X chromosome due to...
Nevada researcher re-ignites mammal reproduction debate
...sful in having mates have few offspring while most females
breed throughout their lifetime." The problem with this idea is that, until now, only about 30-percent of studies have supported the hypothesis, which has been debated because there have been so many studies that have attempted to test the idea. The...
Biologists deciphering complex lemur scent language
...nd female genital glands produce a sticky goo that females
might mix with urine, and which might have an effe...ar to males, versus a different kind of message to females
at another time of the year." Such insights have only whetted Drea's and Scordato's scientific appet...
Coordinating power of circadian rhythms keeps estrus and pregnancy on track
...rain. The researchers also found that Clock mutant females
exhibited high rates of mid-gestation pregnancy failure, a process that had not previously been linked to circadian rhythms. These experiments increase the understanding of the way complex physiology can be regulated by circadian rhythms. More...
Sex pheromone blocked in bug
...d hosts by smell and use pheromones to guide other females
to goodegg-laying sites....
Size does matter when choosing a mate
The difference in size between males and females
of the same species is all down to the battle for ...ecies with low intensity of male-male competition, females
tend to be the larger of the sexes....
Study explains spatial orientation differences between sexes
...ow males to adjust themselves more accurately than females
in some environments. In the study, Tremblay asked 24 people (11 males and 13 females) to point a laser straight-ahead (perpendicular to the body orientation) while upright and when tilted 45 degrees backward. To test whether cognitive processes aff...
Manatee population rising in some regions, likely stalled or declining in others
... Because scientists can identify individual adult females
from scar patterns, they can reconstruct the femal...ve rates. Kendall and colleagues found that adult females
in the Northwest region without a dependent first-year calf have a 43 percent probability of produci...
Study: Mothers turn fearless when peptide level drops
...tween a mother and her offspring. What makes these females
unafraid when it comes to protecting their young may be low levels of a peptide, or small piece of protein, released in the brain that normally activates fear and anxiety, according to new research published in the August issue of Behavioral Neurosci...
Whale carcass yields bone-devouring worms
...orms under a microscope, they discovered that most females
had dozens of microscopic male worms living within their bodies. These male worms looked as if they had never developed past their larval stage-their bodies still contained bits of yolk-but they also contained copious quantities of sperm. ...
Forest fire sensor inspired by nature
... burnt wood: immediately after woodland blazes the females
fly in from far and wide, climb up the trees and lay their eggs in the smouldering bark. Since most other insect species tend to avoid freshly scorched areas, the jewel beetle larvae can develop with hardly any competition. The adult insects owe thei...
DNA tests point to extinction of 2 distinctive arctic bird populations
...hat brighter-plumaged males are more attractive to females
and thus have more mating opportunities, leading to greater reproductive success. Male ptarmigan will soil their feathers, providing instant camouflage, once their mates have begun laying eggs and this camouflage is reversible if the female loses he...
When male fish hum, females swim in, thanks to hormones, adaptable hearing
...fish with a remarkable hearing system that enables females
to zero in on the love hums broadcast by males dur... sing their love songs to attract females. But the females
can't process this vital information and respond appropriately if they can't hear it. Steroid hormo...
Hormone helps fish to mate, may affect human hearing
... levels of the steroid hormone in non-reproductive females
of the fish species Porichthys notatus, temporar...eady to be deposited, even if the hearing-enhanced females
had been attracted to the males' nests. Rather, the Cornell biologists found a hormonal trigger for ...
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