Results 31 to 40 of about 1,336,652 (309)

Sex roles and sex ratios in animals

Biological Reviews, 2022
ABSTRACTIn species with separate sexes, females and males often differ in their morphology, physiology and behaviour. Such sex‐specific traits are functionally linked to variation in reproductive competition, mate choice and parental care, which have all been linked to sex roles.
Kappeler, Peter M., Benhaiem, Sarah, Fichtel, Claudia, Fromhage, Lutz, Höner, Oliver P., Jennions, Michael D., Kaiser, Sylvia, Krüger, Oliver, Schneider, Jutta M., Tuni, Cristina, van Schaik, Jaap, Goymann, Wolfgang, Benhaiem, Sarah; 3 Department of Ecological Dynamics Leibniz Institute for Zoo and Wildlife Research Alfred‐Kowalke‐Strasse 17 D‐10315 Berlin Germany, Fichtel, Claudia; 1 Behavioral Ecology and Sociobiology Unit, German Primate Center – Leibniz Institute of Primatology Kellnerweg 4 37077 Göttingen Germany, Fromhage, Lutz; 4 Department of Biological and Environmental Science Ambiotica, University of Jyväskylä PO Box 35 40014 Jyväskylä Finland, Höner, Oliver P.; 5 Department of Evolutionary Ecology Leibniz Institute for Zoo and Wildlife Research Alfred‐Kowalke‐Strasse 17 D‐10315 Berlin Germany, Jennions, Michael D.; 6 Division of Ecology & Evolution, Research School of Biology ANU College of Science, The Australian National University RN Robertson Building, 46 Sullivans Creek Road Canberra ACT 2600 Australia, Kaiser, Sylvia; 7 Department of Behavioural Biology University of Münster Badestr. 13 48149 Münster Germany, Krüger, Oliver; 8 Department of Animal Behavior Bielefeld University Morgenbreede 45 33615 Bielefeld Germany, Schneider, Jutta M.; 9 Department of Biology, Institute of Zoology Universität Hamburg Martin‐Luther‐King Platz 3 20146 Hamburg Germany, Tuni, Cristina; 10 Department of Biology II Ludwig Maximilians University of Munich Großhaderner Str 2 82152 Planegg‐Martinsried Germany, van Schaik, Jaap; 11 Applied Zoology and Nature Conservation University of Greifswald Loitzer Str. 26 17489 Greifswald Germany, Goymann, Wolfgang; 12 Department of Behavioural Neurobiology Max Planck Institute for Ornithology Eberhard‐Gwinner‐Str. 6a D‐82319 Seewiesen Germany   +22 more
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Sex ratios in the rodent malaria parasite, Plasmodium chabaudi [PDF]

, 2003
The sex ratios of malaria and related Apicomplexan parasites play a major role in transmission success. Here, we address 2 fundamental issues in the sex ratios of the rodent malaria parasite, Plasmodium chabaudi.
West, SA, West, S A, Read, A F, REECE, S. E., West, S. A., Read, A. F., Duncan, A B, West, Stuart A, Reece, S E, Duncan, A., Reece, SE, Duncan, AB, Read, AF, Duncan, Alison B, Read, Andrew F   +14 more
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Uniform female-biased sex ratios in alpine willows [PDF]

, 2012
Premise of the study: The development of biased sex ratios in dioecious plant species has been ascribed to either (1) factors influencing differential adult mortality of male and female plants or (2) factors acting at an early life stage that determine ...
Myers-Smith, Isla H., Hik, David S.
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Haplodiploidy, sex-ratio adjustment, and eusociality.

, 2013
Hamilton's "haplodiploidy hypothesis" holds that inflated sororal relatedness has promoted altruistic sib rearing in haplodiploids, potentially explaining their apparent predisposition to eusociality.
Gardner, A, Ross, Laura, Ross, L, Gardner, Andy   +3 more
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Sex allocation theory reveals a hidden cost of neonicotinoid exposure in a parasitoid wasp [PDF]

, 2015
P.R.W. was funded by the University of Stirling, C.V.B. and S.M.G. were funded by Nuffield Research Placements and N.C., J.G. and D.M.S. were funded by NERC (NE/J024481/1).Sex allocation theory has proved to be one the most successful theories in ...
Whitehorn, Penelope R, Shuker, David M, Whitehorn, Penelope R., Blackburn, Charlotte, David, Shuker M., Blackburn, Charlotte V., Gill, Sophie M., Gill, Sophie, Cook, Nicola, Green, Jade, Shuker, David M., Shuker, D. M.   +11 more
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Mother's occupation and sex ratio at birth

BMC Public Health, 2010
Background Many women are working outside of the home, occupying a multitude of jobs with varying degrees of responsibilities and levels of psychological stress. We investigated whether different job types in women are associated with child sex at birth,
Amiot Volodymyr, Colijn Grant P, Ruckstuhl Kathreen E, Vinish Erin   +3 more
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Natural Selection and the Sex Ratio [PDF]

Nature, 1960
IN a recent article, Kalmus and Smith1 have attempted to explain why a sex ratio of about one half is selectively advantageous. More recently, Bodmer and Edwards2 have published a paper on the same subject. The two approaches differ in the emphasis placed on different forms of selection. Kalmus and Smith believe that there are two main selective forces
W F, BODMER, A W, EDWARDS
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Girl or boy? Prenatal lead, cadmium and mercury exposure and the secondary sex ratio in the ALSPAC study [PDF]

, 2014
The aim of this study was to evaluate the effect of prenatal exposure to lead, cadmium and mercury levels on the secondary sex ratio. Whole blood samples were collected from pregnant women enrolled in the Avon Longitudinal Study of Parents and Children ...
Emond, A.M., Taylor, C.M., Taylor, Caroline M, Golding , Jean, Golding, J., Emond, Alan M   +5 more
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The male to female ratio at birth [PDF]

, 2014
The factors that influence the male to female ratio at birth are legion. Males are usually born in excess and stress decreases the ratio while wellbeing and good health tends to increase it.
Mamo, Julian, Grech, Victor E.
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Air Pollution and Human Sperm Sex Ratio

American Journal of Men's Health, 2018
The present study was designed to address the hypothesis that exposure to specific air pollutants may impact human sperm Y:X chromosome ratio. The study population consisted of 195 men who were attending an infertility clinic for diagnostic purposes and ...
Michał Radwan, Emila Dziewirska, Paweł Radwan, Lucjusz Jakubowski, Wojciech Hanke, Joanna Jurewicz   +5 more
doaj   +1 more source