Sentences with phrase «on sex ratios»

Brendan Godley at the University of Exeter, UK, and colleagues, analysed 26 years of data to see if fluctuations in temperatures had an influence on sex ratios of turtles in North Carolina.

As a result, the species can shape the ecosystem differently depending on the sex ratio of the population,» Palkovacs said.

Not exact matches

For the study, the researchers incubated eggs from the Trachemys scripta elegans, a semi-aquatic turtle, under different temperature and moisture regimes to study the effect of the two environmental factors on developmental rate, egg mass, embryo mass and length, and sex ratio.

That's according to Misao Fukuda at the M&K Health Institute in Hyogo, Japan, and colleagues, who found subtle differences in sex ratios of children depending on when a mother entered menarche.

On a larger scale, the number of men with more X sperm compared to the number of men with more Y sperm affects the sex ratio of children born each year.

Ancient Athens most likely had a sex ratio between 1.43 and 1.74 (based on a historical analysis) because of rampant female infanticide and neglect.

What had caused the sex ratio to drop so dramatically, Guttentag wondered, and what impact did this change have on society?

The lowest sex ratio — about 0.79 — is in Djibouti on the Horn of Africa, where an unemployment rate of 40 to 50 percent has forced men to emigrate.

Hispanic Americans, on the other hand, have the highest sex ratio of any ethnic group in the country — over 1.5 for people in their twenties — mainly because far more men immigrate than women.

The highest sex ratio in the world right now — 4.15 — is in Qatar, where thousands of men have immigrated to work on construction and oil projects.

Analysis of the images provided data on sex - ratio bias, site fidelity and aggregation, hotspot sites, size and migration patterns of the animal — details that improve scientists» understanding of the species and help conservation efforts to protect them and their environment.

It adds a reliable character, increases the utility of available samples, identifies the sex of the turtle without the need to sacrifice imperiled species, and does not make assumptions about the relationship between incubation conditions and the sex ratio,» said Jeanette Wyneken, Ph.D., co-author of the study and a professor of biological sciences in FAU's Charles E. Schmidt College of Science who collaborated on the study with Boris M. Tezak, first author and a FAU graduate student, and Kathleen Guthrie, Ph.D., associate professor of biomedical science in FAU's Charles E. Schmidt College of Medicine.

Despite this risk, very few studies actually verify the sex of individual sea turtles and then compare that data to predictions of sex ratios based on the incubation environment.

Rabinowitz acknowledges the greater urgency for captive breeding, but disputes whether the data on population size, sex ratio and breeding success in the wild are good enough to say that wild populations are in terminal decline or that captive breeding — «an absolute last resort», he says — is the only option.

This has been shown to have a small but significant impact on population size by increasing the number of breeding birds, as well as influencing the sex ratio.

This is also important as previous evidence indicates that different neonicotinoids may exert opposing effects on bumblebee queen production and sex ratios of colonies.

Recent research was reported in an article in the Canadian Journal of Fisheries and Aquatic Sciences, which found that high levels of road salt can alter the sex ratios of frogs; an article in Environmental Toxicology and Chemistry, which documented the effects of road salt and a common insecticide on wetland food webs; and an article in Environmental Pollution, which examined potential interactions between road salt, predators, and competitors in wetland food webs.

Results had to be given separately for men and women, or, if they were based on both combined, the hazard ratios must be adjusted for age and sex.

We examined the APOE4 - by - sex interaction in conversion risk (from healthy aging to mild cognitive impairment (MCI) / AD or from MCI to AD) and cerebrospinal fluid (CSF) biomarker levels.Cox proportional hazards analysis was used to compute hazard ratios (HRs) for an APOE - by - sex interaction on conversion in controls (n = 5,496) and MCI patients (n = 2,588).

Scrotal heat stress effects on sperm viability, sperm DNA integrity, and the offspring sex ratio in mice

This could be the possible on the same ratio — on average — that a regular person will get in his / her sex dating life.

Certainly, there are men who prefer to pursue larger ladies for various reasons, some of which include less scrupulous motivation of preying on people's insecurities for sex, but the ratio we observed seemed out of whack.

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Though it employs the wider cinematic aspect ratio and carries an R rating for some sex, nudity, and violence, Inconceivable basically is one of those «crazy woman» movies you might find on Lifetime.

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The most recent estimates for breeding and mature females are 6,250 and 9,341 respectively, based on census data from 2001 - 2002; suggesting c. 18.682 mature individuals, assuming an equal sex ratio (Ratcliffe et al. 2008).

To determine whether there was an association between endogenous sex hormones and risk of bone sarcoma, relative risk (RR) of incidence rates and hazard ratios for bone sarcoma were calculated for dogs subdivided on the basis of lifetime gonadal hormone exposure.

For example, the warm - water phase of ENSO is associated with large - scale changes in plankton abundance and associated impacts on food webs (Hays et al., 2005), and changes to behaviour (Lusseau et al., 2004), sex ratio (Vergani et al., 2004) and feeding and diet (Piatkowski et al., 2002) of marine mammals.

Sex ratio effects on reproductive strategies in humans.

The randomisation sequence will allocate in a 1:1 ratio to the two treatments arranged in permuted blocks and will be stratified on age (under 5 years and over 5 years), sex, and ethnicity (Maori and Non-Maori).