▁bi ased , ▁more ▁female - f em ale ▁competition ▁is ▁observed ▁and ▁the ▁opposite ▁is ▁seen ▁for ▁a ▁male ▁population ▁where ▁a ▁male ▁bi ased ▁would ▁cause ▁more ▁male - male ▁interaction ▁and ▁compet it iveness . ▁Though ▁both ▁sex es ▁may ▁be ▁compet ing ▁for ▁m ates , ▁it ▁is ▁important ▁to ▁remember ▁that ▁the ▁bi ased ▁OS R ▁predict s ▁which ▁sex ▁is ▁the ▁pre domin ant ▁compet itor ▁( the ▁sex ▁that ▁exhib its ▁the ▁most ▁competition ). ▁OS R ▁can ▁also ▁predict ▁what ▁will ▁happen ▁to ▁mate ▁guard ing ▁in ▁a ▁population . ▁As ▁OS R ▁becomes ▁more ▁bi ased ▁to ▁one ▁sex , ▁it ▁can ▁be ▁observed ▁that ▁mate - guard ing ▁will ▁increase . ▁This ▁is ▁likely ▁due ▁to ▁the ▁fact ▁that ▁rival ▁numbers ▁( number ▁of ▁a ▁certain ▁sex ▁that ▁are ▁also ▁ready ▁to ▁mate ) ▁are ▁increased . ▁If ▁a ▁population ▁is ▁male ▁bi ased ▁then ▁there ▁are ▁a ▁lot ▁more ▁rival ▁males ▁to ▁comp ete ▁for ▁a ▁mate , ▁meaning ▁that ▁those ▁who ▁have ▁a ▁mate ▁already ▁are ▁more ▁likely ▁to ▁guard ▁the ▁mate ▁that ▁they ▁have . ▁ ▁Further ▁examples ▁of ▁factors ▁that ▁affect ▁OS R ▁ ▁Sex ▁in ▁age ▁at ▁m atur ity ▁is ▁another ▁possible ▁factor ▁that ▁can ▁affect ▁OS R . ▁If ▁it ▁takes ▁one ▁sex ▁longer ▁to ▁m ature ▁than ▁the ▁other , ▁it ▁would ▁be ▁expected ▁to ▁see ▁a ▁bi ased ▁OS R ▁of ▁the ▁sex ▁that ▁m ature d ▁faster , ▁most ▁of ▁the ▁time .