New Study Flips Core Rule of Evolution
A new study on spotted hyenas challenges the traditional Darwin-Bateman paradigm by showing that female reproductive inequality is higher than male inequality over multiple generations. High-ranking female lineages accumulate dominance because social rank is inherited and maintained within natal clans.
Why it matters
This research provides a significant update to evolutionary biology, demonstrating that long-term pedigree analysis can reveal patterns invisible to single-generation studies.
Summary: A new study shows that female spotted hyenas exhibit greater reproductive inequality than males when evaluated over multiple generations. While single-generation metrics align with the traditional Darwin-Bateman paradigm, showing higher short-term reproductive variation among males, long-term pedigree analysis reveals that high-ranking female alpha lineages accumulate disproportionate descendants. Within six generations, virtually an entire clan traces back to an alpha matriarch.
This multigenerational shift occurs because female hyenas inherit social rank from their mothers and stay in their natal clans, preserving privileges like priority food access, early reproduction, and longevity. Conversely, males disperse to join new clans and lose their maternal rank, preventing paternal lineages from accumulating long-term reproductive dominance.
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