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NEONATAL CO-ADMINISTRATION OF THE PHYTOESTROGENS GENISTEIN AND DAIDZEIN DISRUPTS SEXUAL BEHAVIOR AND FERTILITY.
Physiol Behav
January 2025
Departamento de Biología de la Reproducción. D.C.B.S, Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, C.P, 09340, Ciudad de México, México. Electronic address:
Phytoestrogens are non-steroidal compounds that, can act as agonists and/or antagonists by binding to estrogen receptors; hence they can modify estrogen-dependent processes of neonatal sexual differentiation. Results of the analysis of the sexual behavior of experimental rats that received 6.8 mg of isoflavones/kg/day, showed significantly more mating activity, but fewer ejaculations (p<0.
View Article and Find Full Text PDFEvolution of Human Pair Bonds as a Consequence of Male-Biased Mating Sex Ratios?
Bull Math Biol
January 2025
School of Mathematics and Statistics, The University of Sydney, Sydney, NSW, 2006, Australia.
Compared to our closest primate relatives, human life history involves greater longevity, which includes a distinctive postmenopausal life stage. Given mammalian reproductive physiology in which females build a finite stock of cells that can become oocytes early in life, which then continuously deplete mostly through cell death while males produce new sperm throughout adulthood, the postmenopausal stage makes the sex ratio in the fertile pool, called the adult sex ratio (ASR), male biased. Additionally, this affects a more fine-grained ratio, the operational sex ratio (OSR), defined as the ratio of males to females currently able to conceive.
View Article and Find Full Text PDFBarH1 regulates the expression of conserved odorant-binding protein 22 from Dastarcus helophoroides.
Insect Biochem Mol Biol
January 2025
Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China. Electronic address:
Chemical signals are pivotal in establishing tritrophic interactions among host plants, herbivorous insects, and natural enemies. Previous studies have shown that evolutionarily conserved MaltOBPs in Monochamus alternatus and DhelOBPs in Dastarcus helophoroides contribute to the establishment of pine -pest - natural enemy tritrophic interactions by recognizing the same volatile emitted by the host during crucial developmental stages. We hypothesized that the transcriptional regulatory mechanisms of evolutionarily conserved OBPs respectively from pests and enemies are similar.
View Article and Find Full Text PDFPollination ecotypes and the origin of plant species.
Proc Biol Sci
January 2025
Centre for Functional Biodiversity, University of KwaZulu-Natal, Pietermaritzburg 3209, South Africa.
Ecological niche shifts are a key driver of phenotypic divergence and contribute to isolating barriers among lineages. For many groups of organisms, the history of these shifts and associated trait-environment correlations are well-documented at the macroevolutionary level. However, the processes that generate these patterns are initiated below the species level, often by the formation of ecotypes in contrasting environments.
View Article and Find Full Text PDFThe perceptual effects of signal components: black sword margins are crucial for signal size discrimination in green swordtails .
Proc Biol Sci
January 2025
Centre for Ecology and Conservation, University of Exeter, Penryn, UK.
The signals that mediate mate choice can be complex, comprising multiple components, and understanding how complex signals evolve under sexual selection has been the focus of much study. However, open questions still remain about the role of the female's sensory and perceptual processes in shaping the evolution of complex signals. Male green swordtails have an elongated caudal fin that comprises colour, length and a black melanic margin; females prefer males with larger bodies, longer swords and complete black sword margins.
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