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<p>The California pitcher plant, <i>Darlingtonia californica</i> Torr. (Sarraceniaceae), is a perennial herb endemic to Northern California and western Oregon best known for its highly modified leaves and carnivorous habit. Often found in seeps and bogs, <i>D. californica</i> utilizes carnivory to thrive in low nutrient, hydric soils in which many other plants struggle to survive. This decreased competition is vital for <i>D. californica</i> as its highly modified leaves limit photosynthesis. However, as many regions begin to warm, these ecosystems risk drying that could result in a substantial increase in competition. There is therefore a critical need to understand the degree of genetic structure in <i>D. californica</i>, since such variation is likely to play an important role in adapting to these challenges. To broaden our currently limited understanding of the genetic status of the species, we sampled twenty individuals each from fourteen populations in four Northern California regions. We found hierarchical population structure, with plants in the Six Rivers National Forest region of Northern CA most genetically divergent from populations farther south in the Sierras and a lesser degree of differentiation between populations in the Shasta-Trinity region and the Plumas National Forest, consistent suggesting an outward radiation of the species from the Siskiyou region during a historical range expansion. With the significant risk of habitat loss due to climate change and other factors, these genetic data provide valuable insight to assist in the conservation of this rare and unique species.</p>

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Genetic structure among populations of Darlingtonia californica

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Cody Rice,
  • William Hemstrom,
  • Kristina Schierenbeck

摘要

The California pitcher plant, Darlingtonia californica Torr. (Sarraceniaceae), is a perennial herb endemic to Northern California and western Oregon best known for its highly modified leaves and carnivorous habit. Often found in seeps and bogs, D. californica utilizes carnivory to thrive in low nutrient, hydric soils in which many other plants struggle to survive. This decreased competition is vital for D. californica as its highly modified leaves limit photosynthesis. However, as many regions begin to warm, these ecosystems risk drying that could result in a substantial increase in competition. There is therefore a critical need to understand the degree of genetic structure in D. californica, since such variation is likely to play an important role in adapting to these challenges. To broaden our currently limited understanding of the genetic status of the species, we sampled twenty individuals each from fourteen populations in four Northern California regions. We found hierarchical population structure, with plants in the Six Rivers National Forest region of Northern CA most genetically divergent from populations farther south in the Sierras and a lesser degree of differentiation between populations in the Shasta-Trinity region and the Plumas National Forest, consistent suggesting an outward radiation of the species from the Siskiyou region during a historical range expansion. With the significant risk of habitat loss due to climate change and other factors, these genetic data provide valuable insight to assist in the conservation of this rare and unique species.