In the evolutionary biology of sexual reproduction, 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, or alternatively the local ratio of fertilizable females to sexually active males at any given time. This differs from physical sex ratio or adult sex ratio which simply includes all individuals, including those that are sexually inactive or do not compete for mates.
In the evolutionary biology of sexual reproduction, 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, or alternatively the local ratio of fertilizable females to sexually active males at any given time. This differs from physical sex ratio or adult sex ratio which simply includes all individuals, including those that are sexually inactive or do not compete for mates.
Source: Wikipedia "Operational sex ratio" · CC BY-SA 4.0
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