Michigan State scientists identify chemical come-on of sea lamprey
...ut less so in fish. Moreover, it was presumed that females were often the chemical temptresses. It identifie...spawn in spring. The males arrive earlier than the females and build nests. Then they release pheromones to lure the ripe females. To find the chemical, Li's t...Ambushing prey may make snakes vulnerable
...of the threatened snakespecies have about 15% more females than males. Half of the 8 ambush predator species are classified as threatened whilefewer than a tenth of the active hunter species are threatened. Snakesthat ambush their prey need to be able to hide in thick leaf litter andother particular ground c...Unwanted HRT playing havoc with songbirds
...reproduction. They also alter their brains, making females sing when they shouldn't. "This is very significant," says David Crews, an expert on the effects of synthetic chemicals on animal reproduction at the University of Texas in Austin. He says that until now, concrete evidence on how pollutants affect a...Some animals can recognize degree of kinship by scent
...ning, colonies of burrows are inhabited by related females of various ages (and a few young males that have yet to leave). o Cooperative territorial defense is important to preserve nest sites and to keep infanticidal adults away from vulnerable young, but fighting can cost injuries or even lives. Risking l...Transgenic mice mimic cardiac hypertrophy in humans
...ans. The male mice develop enlarged hearts but the females do not. However, when the females are given a drug that blocks the action of the female hormone, estrogen, their hearts enlarge as wel...Sturgeon researcher's vision spawns thriving industry
...e than 1,000 pounds. They mature slowly, with wild females first spawning when 15 to 25 years old. Doroshov showed that sturgeon could be raised in ponds and tanks and fed an artificial food. In collaboration with other UC Davis scientists, he has applied his research to breed bigger, longer-living sturgeon ...Scientists meet to discuss latest in how sex matters
...h this condition were found to identify happily as females and were not confused about their gender....Alaskan waters growing hospitable to sharks while seals and sea lions decline
...evealed that most of the salmon sharks caught were females but researchers don't know why. Among other things, Gallucci's group is trying to find ways to analyze hormones from blood samples that might allow them to determine the age, sexual maturity and other information. Such life-history data can then be u...Battle of the sexes leads to a biological arms race
...een males and females. We all know that males and females of most animal species look and behave very differ... impressed, and such differences between males and females have traditionally been explained by females search for good fathers for their offspring. A new and ...Battle of the sexes leads to evolutionary arms race
...onflicts of interest between the sexes. "Males and females of most animal species look and behave very differ...lly been explained as evolutionary consequences of females searching for good fathers for their offspring." The key to their research lies in the fact that mal...Pheromones control sex discrimination in mice
...ed the knockout mice in cages with either males or females and found that the knockout mice attempted to mate with either sex. Additional studies showed that the knockout mice emitted the same mating-related ultrasound vocalizations with males and females, demonstrating that a full range of courtship behavio...Media Advisory 2 - 2002 Ocean Sciences Meeting: press conferences scheduled
... The males go north to the Aleutian Islands, while females go to mid ocean fronts 1,000 kilometers [600 miles] south of the males. Blue whales travel at relatively high speeds for months, moving from California feeding grounds in the summer to winter grounds off Mexico and Costa Rica. Participants: Jeffre...Nexia and US Army spin the worlds first man-made spider silk performance fibers
...oats. Males are being used to expand the herd and females will begin producing milk in the second quarter 2002 to provide increasing quantities of BioSteel for spinning process optimization, product development and commer-cialization....URI oceanography models migration and foraging strategies of North Atlantic right whales
...e western North Atlantic right whales may be those females taking their calves on the tour of the foraging grounds, someday leading to re-occupation of the historic right whale habitat off eastern Canada....White sharks migrate thousands of miles across the sea, new study finds
...ds for some time." Three other tagged sharks - two females and a male - migrated to asubtropical region of th...and again," saidPyle. "Males come back yearly, but females return every other year, whichmeans they may be going farther afield than males as part of a two-yea...Women more susceptible to orthostatic hypotension
...yr, 176 4 cm, and 80 12 kg; means SD) and eight females (26 6 yr, 161 8 cm, and 64 12 kg). Two experime...4). Specifically, heart rate increased more in the females than in the males (P < 0.05), and MAP increased more in the males than in the females at 60 HUT....Molecular basis of mental retardation uncovered
...ects approximately 1 in 2,000 males and 1 in 4,000 females worldwide.Symptoms include mild to moderate cognitive and behavioral deficits as wellas subtle facial malformations. In addition, the brain cells, or neurons,of people with the disease have abnormal physical features: their"dendritic spines" - the fi...Female vulnerability to drugs tied to estrogen, U-M researcher reports
... followed by rapid ejaculation, she reports, while females prefer a slower pace, with one or two minutes betw...ve found that estrogen enhances the behaviors that females engage in to slow male rats down. "So, the effects of estrogen to enhance sexual motivation may und...Sea Grant study finds Chinese mitten crabs appear free of human parasite lung flukes
...shing is allowed, and people do eat thecrabs. Live females with eggs can sell for more than $20 per crab in Asian markets, although the sale and transport of live mitten crabs is illegal in California, an effort to curb their spread. Chinese mitten crabs are native to China and Korea but are a highly invasiv...Parasitic worms 'read' the bodys immune condition and reproduce accordingly
...inning five weeks after the initial infection, the females may release as many as 300 eggs per day. The new report shows that in the attenuated mode, the worms produce between five and ten times fewer eggs. The scientists made their discovery by examining worm infections in mice that lack various immune el...