Male wild tureky. Photo: Mcvoorhis, Wikimedia commons.

Fig. 1 from the article: Proportion of male eastern wild turkey Meleagris gallopavo silvestris offspring in Georgia, southeast Louisiana, South Carolina, and west Louisiana, USA from 2020–2023.

Fig. 2 from the article: Coefficient plot representing Bayesian logistic regression model estimating variation in offspring sex ratio of female eastern wild turkeys (Meleagris gallopavo silvestris) across the southeastern United States during 2020–2023.

🚨 Top-downloaded 2024/25: female wild turkeys produce fewer male offspring where hunting increases male mortality, suggesting adaptive adjustment of brood sex ratios to enhance reproductive success under harvest pressure.

➡️ vist.ly/4uwtm

#ornithology #birds #adaptive #sexratio 🪶

Male wild tureky. Photo: Mcvoorhis, Wikimedia commons.

Fig. 1 from the article: Proportion of male eastern wild turkey Meleagris gallopavo silvestris offspring in Georgia, southeast Louisiana, South Carolina, and west Louisiana, USA from 2020–2023.

Fig. 2 from the article: Coefficient plot representing Bayesian logistic regression model estimating variation in offspring sex ratio of female eastern wild turkeys (Meleagris gallopavo silvestris) across the southeastern United States during 2020–2023.

NEW PAPER: Female wild turkeys produce fewer male offspring where hunting increases male mortality, suggesting adaptive adjustment of brood sex ratios to enhance reproductive success under harvest pressure.

➡️ vist.ly/4cff4

#ornithology #birds #adaptive #sexratio 🪶

Original post on mastodon.social

Operational sex ratio (Ecology 🏞️)

In the evolutionary biology of sexual reproduction, operational sex ratio is the ratio of sexually competing males that are ready to mate to sexually competing females that are ready to mate, or alternatively the local ratio of fertilizable females to sexually […]

Study Finds Larger Baleen Whale Mothers Favor Female Calves

Larger baleen whale mothers are more likely to give birth to female calves, a University of Washington study finds, overturning the expected Trivers‑Willard pattern. getnews.me/study-finds-larger-balee... #baleenwhales #sexratio #evolutionarybiology

Your chance of having a boy or girl may not be 50/50 We commonly think that sperm determines the sex of a child, depending on whether it carries an X or Y chromosome, but a study now suggests that a woman's age is also a factor

Your chance of having a boy or girl may not be 50/50 #Science #Biology #Genetics #SexRatio #ReproductiveHealth

Relationships between the type of genetic sex-determination (GSD) system, adult sex ratio (ASR), and sex bias in demographic traits across tetrapods. Left: Phylogenetic distribution of the six variables across 453 tetrapod species. The innermost color circle shows the type of GSD (XX/XY and ZZ/ZW sex-chromosome systems abbreviated as XY and ZW, respectively), whereas the outer circles illustrate sex biases shown as female (red, negative values) or male (blue, positive values) bias, in the following order from inner circle to outer circle: ASR, birth sex ratio (both sex ratios depicted as deviations from 1:1), and sex differences in juvenile and adult mortality and maturation age. Right: Differences in ASR and other demographic traits between XY and ZW systems, shown as violin plots.

Why are tetrapods with ZZ/ZW sex-determination systems more male-skewed than XY/XX? Phylogenetic analyses of a large dataset of wild #tetrapod species reveal that #SexDetermination systems influence adult #SexRatio via sex-biased adult mortality @plosbiology.org 🧪 plos.io/43qTysJ

Relationships between the type of genetic sex-determination (GSD) system, adult sex ratio (ASR), and sex bias in demographic traits across tetrapods. Left: Phylogenetic distribution of the six variables across 453 tetrapod species. The innermost color circle shows the type of GSD (XX/XY and ZZ/ZW sex-chromosome systems abbreviated as XY and ZW, respectively), whereas the outer circles illustrate sex biases shown as female (red, negative values) or male (blue, positive values) bias, in the following order from inner circle to outer circle: ASR, birth sex ratio (both sex ratios depicted as deviations from 1:1), and sex differences in juvenile and adult mortality and maturation age. Right: Differences in ASR and other demographic traits between XY and ZW systems, shown as violin plots.

Why are tetrapods with ZZ/ZW sex-determination systems more male-skewed than XY/XX?. Phylogenetic analyses of a large dataset of wild #tetrapod species reveal that #SexDetermination systems influence adult #SexRatio via sex-biased adult mortality @plosbiology.org 🧪 plos.io/43qTysJ

Relationships between the type of genetic sex-determination (GSD) system, adult sex ratio (ASR), and sex bias in demographic traits across tetrapods. Left: Phylogenetic distribution of the six variables across 453 tetrapod species. The innermost color circle shows the type of GSD (XX/XY and ZZ/ZW sex-chromosome systems abbreviated as XY and ZW, respectively), whereas the outer circles illustrate sex biases shown as female (red, negative values) or male (blue, positive values) bias, in the following order from inner circle to outer circle: ASR, birth sex ratio (both sex ratios depicted as deviations from 1:1), and sex differences in juvenile and adult mortality and maturation age. Right: Differences in ASR and other demographic traits between XY and ZW systems, shown as violin plots.

Why are tetrapods with ZZ/ZW sex-determination systems more male-skewed than XY/XX?. Phylogenetic analyses of a large dataset of wild #tetrapod species reveal that #SexDetermination systems influence adult #SexRatio via sex-biased adult mortality @plosbiology.org 🧪 plos.io/43qTysJ

Female-biased spontaneous dispersal in Drosophila melanogaster and sex-specific effect of nutrition and density therein

https://doi.org/10.1111/oik.10920

#Drosophilamelanogaster #SexDifference #NutritionalDeprivation #SexRatio #DensityDependence

New research article! 📰

Morooka et al. found larger body sizes in colder regions but no clear support for the hypothesis that king displacement causes sex ratio bias. ❄
doi.org/10.1007/s000...

#InsectesSociaux #SocialInsects #Termite #SexRatio #BodySize #ClimateAdaptation #InsectEcology #Alate

@andygardner.bsky.social new paper on the origins of rarer-sex effect in sex-ratios

Evidence that Fisher was aware of Cobb's preexisting work on the topic

#bioanth #sexratio #naturalselection 🧪