B.C. orca mothers pay a higher price for birthing sons than daughters: study
Whale researchers say they’ve known for some time that male orcas demand more of their mothers’ attention than female ones, but they only recently learned what impact that extra neediness has on reproduction.of 40 southern resident killer whale mothers published Wednesday , the Center for Whale Research found when the mothers birthed a son rather than a daughter their annual childbearing success was cut in half.
“Female reproductive success in this population is highly dependent on prey availability and females’ nutritional state, and thus reductions in food intake due to prey sharing are likely to have significant impacts on females’ reproductive success,” the study reads.“The evolutionary benefit of helping their male offspring survive into maturity is that the sons will mate, passing their genes to future generations,” lead-author Dr. Michael Weiss said in a news release.
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