- operational sex ratio
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the ratio of males and females available to mate with one another. Not the same as the sex ratio
Dictionary of ichthyology. 2009.
operational sex ratio
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Operational sex ratio — In the evolutionary biology of sexual reproduction, the operational sex ratio (OSR) is the ratio of sexually competing males that are ready to mate to sexually competing females that are ready to mate.[1][2] It is different from the physical sex… … Wikipedia
Sex ratio — is the ratio of males to females in a population. The primary sex ratio is the ratio at the time of conception, secondary sex ratio is the ratio at time of birth, and tertiary sex ratio is the ratio of mature organisms. [Nancy S. Coney and W. C.… … Wikipedia
Sexuelle Selektion — Die Sexuelle Selektion (lateinisch selectio ‚Auslese‘) ist eine innerartliche Selektion, die auf körperliche Merkmale wirkt und durch Varianz im Fortpflanzungserfolg zwischen Mitgliedern desselben Geschlechts entsteht.[1] Diese… … Deutsch Wikipedia
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Sexual selection — This article is about the evolutionary concept. For the selection of the sex of offspring, see sex selection. Goldie s Bird of paradise: Ornamented male above; female below. Paradesia decora by John Gerrard Keulemans (d.1912) Sexual selection, a… … Wikipedia
List of statistics topics — Please add any Wikipedia articles related to statistics that are not already on this list.The Related changes link in the margin of this page (below search) leads to a list of the most recent changes to the articles listed below. To see the most… … Wikipedia
OSR — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Sigles d’une seule lettre Sigles de deux lettres > Sigles de trois lettres Sigles de quatre lettres … Wikipédia en Français
Sexual reproduction — is the creation of a new organism by combining the genetic material of two organisms. The two main processes are: meiosis, involving the halving of the number of chromosomes; and fertilization, involving the fusion of two gametes and the… … Wikipedia
Poison dart frog — Poison dart frogs (Dendrobatidae) Dendrobates azureus (top) and Dendrobates leucomelas Scientific classification … Wikipedia
OSR — can refer to: OSR#1, an industrial chelation agent which had been marketed as a dietary supplement to parents of children with autism Operational sex ratio, ratio of reproductively available males to females Ōban Star Racers, an animated… … Wikipedia
