Mother knows best: finches choose chicks' gender
Female parrot finches can match their offspring's gender to prevailing living conditions, producing more sons in lean times, scientists in Australia said Wednesday.
View ArticleScientists identify why some fathers are left holding the baby
A century old mystery as to why, for some animals, it's the father rather than the mother that takes care of their young has been cracked by scientists at the University of Sheffield and University of...
View ArticleFemales lead population collapse of the endangered Hawaii creeper
(Phys.org) —Only 22 to 28 percent of the remaining adult population of the endangered Hawai'i creeper (Oreomystis mana) found in the southern portion of the Hakalau Forest National Wildlife Refuge is...
View ArticleOmega-6 key to female lamb conception
New research has shown farmers may be able to determine the sex ratios of lambs by raising omega-6 fatty acids in the diets of breeding stock, a discovery that could have major benefits for industry.
View ArticleBiased sex ratios predict more promiscuity, polygamy and divorce in birds
(Phys.org) —Birds in female-dominated populations are more likely to ditch and 'divorce' their mates while promiscuity increases in predominantly male environments, according to new research.
View ArticleFemale pigs can recognise the sex of sperm and influence the sex of their...
(Phys.org) —Female pigs' reproductive systems recognise whether a sperm will produce a boy or a girl before it reaches and fertilises the egg, and their oviduct (fallopian tubes) change in response,...
View ArticleThe uncertain future of gender 'rebalancing' in China
China is the most gender imbalanced country in the world, with an official sex ratio at birth (SRB) of 117.78 (boys for every one hundred girls) in 2011. Over the past two decades the rise in China's...
View ArticlePromiscuous males die young, childless females live longer
(Phys.org) —A study of birds by researchers from our Department of Biology & Biochemsitry in collaboration with the University of Sheffield shows for the first time how sexual behaviour is linked...
View ArticleSurprising demographic shifts in endangered monkey population challenge...
(Phys.org)—At first glance, the northern muriqui monkey is a prime conservation success story.
View ArticleMammals can 'choose' sex of offspring, study finds
A new study led by a researcher at the Stanford University School of Medicine shows that mammalian species can "choose" the sex of their offspring in order to beat the odds and produce extra...
View ArticleGlobal warming could help bolster turtle population size
(Phys.org) —Scientists studying the sex ratio of sea turtles at one of the world's largest rookeries predict global warming could help bolster population sizes.
View ArticleTaking the 'sting' out of reproduction
(Phys.org) —Female parasitic wasps have more reproductive success when working together with other females, which can also explain sex biased reproduction, according to new research.
View ArticleTurtle populations benefit from cooler rookery
A UWA scientist says cooler winters at Cape Domett, in the mouth of the Kimberley's Cambridge Gulf, may be good long-term news for flatback turtles (Natator depressus).
View ArticleResearch finds reef fish can adjust for gender as oceans warm
Using a multigenerational experiment UTS research has shown for the first time that when reef fish parents develop from early life at elevated temperatures they can adjust their offspring gender...
View ArticleStudy finds equality between sexes at moment of conception
Every year, slightly more boy babies than girl babies are born worldwide. But back when sperm meets egg, the two sexes are conceived in equal numbers, a new study suggests.
View ArticleHumans threaten Asian horseshoe crabs
Human activity is affecting the population of Asian horseshoe crabs in the state of Sabah in Malaysia, possibly by disrupting the male to female ratio – that is the conclusion of a study that surveyed...
View ArticleClimate to cause lesser of two weevils, study says
Rising temperatures may shift the gender balance of Mediterranean weevils in favour of females, said a study Wednesday into a bizarre consequence of global warming.
View ArticleSex and sea turtles: New study reveals impact of climate change, sea level rise
Marine turtles deposit their eggs in underground nests where they develop unattended and without parental care. Incubation temperature varies with environmental conditions, including rainfall, sun,...
View ArticleMosquitofish populations with more females have greater ecological impact
Female mosquitofish are not only bigger than the males, they have bigger impacts on freshwater ecosystems. In a controlled study conducted in experimental ponds, researchers found dramatic differences...
View ArticleFirst gene linked to temperature sex switch
The sex of many reptile species is set by temperature. New research reported in the journal GENETICS identifies the first gene associated with temperature-dependent sex determination in any reptile....
View ArticleIt's raining men! Sweden sees historic gender balance shift
Famous for its efforts to put women on an equal footing with men, Sweden is experiencing a gender balance shift that has caught the country by surprise: For the first time since record-keeping began in...
View ArticleA male-killing bacterium results in female-biased sex ratios in green lacewings
A maternally transmitted Spiroplasma bacterium is the likely cause of the green lacewing's female-biased sex ratio, according to a study published June 15, 2016 in the open-access journal PLOS ONE by...
View ArticleClimate change's effect on Rocky Mountain plant is driven by sex
For the valerian plant, higher elevations in the Colorado Rocky Mountains are becoming much more co-ed. And the primary reason appears to be climate change.
View ArticleResearch reveals why males outnumber females in bird world
UEA research reveals why males outnumber females in bird world
View ArticleMore than a few good men: Study finds counterintuitive outcomes of gender...
Contrary to traditional expectations of unbalanced sex ratios, places with more men than women do not typically experience higher rates of family and social instability, according to a University of...
View ArticleRoad salt can change sex ratios in frog populations, study says
Naturally occurring chemicals found in road salts commonly used to de-ice paved surfaces can alter the sex ratios in nearby frog populations, a phenomenon that could reduce the size and viability of...
View ArticleDeclining male offspring further imperil endangered flycatchers in southern...
A new study in The Condor: Ornithological Applications documents the steep decline of a population of endangered Southwestern Willow Flycatchers over 16 years—and the change in the sex ratio that has...
View ArticleIs it a boy or is it a girl? New method to ID baby sea turtles' sex
Is it a boy or is it a girl? For baby sea turtles it's not that cut and dry. Because they don't have an X or Y chromosome, baby sea turtles' sex is defined during development by the incubation...
View ArticleWhen estimating extinction risk, don't leave out the males
Extinction risk for some species could be drastically underestimated because most demographic models of animal populations only analyse the number and fertility of females, dismissing male data as...
View ArticleAtrazine alters the sex ratio in Blanchard's cricket frogs
A study published recently in Environmental Toxicology and Chemistry found that Blanchard's cricket frogs are highly sensitive to atrazine. When exposed, there were up to 55% fewer males than females...
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