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California grizzly bear

Extinct population of the brown bear

  • 10 min read
  • 5 chapters

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Through Extinction, Population (biology) and North America

"Grizzly" could have meant "grizzled" – that is, with golden and grey tips of the hair – or "fear-inspiring" (as a phonetic spelling of "grisly"). Nonetheless, after careful study, naturalist George Ord formally classified it in 1815 – not for its hair, but for its character – as Ursus horribilis ("terrifying bear").

Genetically, North American brown bears are closely related; in size and coloring, the California grizzly bear was much like the Kodiak bear of the southern coast of Alaska.

The grizzly became a symbol of the Bear Flag Republic, a moniker that was attached to the short-lived attempt by a group of U.S. settlers to break away from Mexico in 1846. Later, this rebel flag became the basis for the state flag of California.

Taxonomy and evolution

A 1953 researcher stated, "The specific status of North American brown bears (or grizzly bears) is one of the most complex problems of mammalian taxonomy. The difficulty stems directly from the work of Merriam (1918), who concluded that there are 86 forms of grizzlies (and brown bears) in North America."

North American brown bears were taxonomically grouped as a species apart from other bear species, until DNA testing revealed that they should properly be grouped in the same species as the other brown bears. Grizzlies living in California had been classified by Merriam into many subspecies. Over time, these were all synonymized into a single subspecies, Ursus arctos californicus. A study based on mitochondrial DNA suggests that the only genetically anomalous grouping of grizzly bears is the ABC Islands bear, implying that previous grizzly bear subspecies designations are unwarranted. However, a formal taxonomic synonymy was not performed, and mitochondrial introgression is known to be an issue in brown bears. Pending further taxonomic resolution, the subspecies is provisionally accepted as separate.

A recent genomic study recovered the California grizzly within a clade of grizzly bears present in the contiguous United States. The grizzly bear population present in Yellowstone National Park was identified as most closely related to the California grizzly, and that the California population diverged approximately 10,000 years ago. The oldest fossil remains of grizzly bears in California were recovered from the La Brea Tar Pits. This fossil specimen, weighing ~455 kilograms (1,003 lb), is dated to the Greenlandian stage, over 7,500 years ago.

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