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Cryptic CAM photosynthesis in Joshua tree (Yucca brevifolia, Y. jaegeriana).

The New phytologist·2025
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150 Years of Coevolution Research: Evolution and Ecology of Yucca Moths (Prodoxidae) and Their Hosts.

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Genome-scale data resolves the timing of divergence in Joshua trees.

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Mitochondrial Divergence between Western and Eastern Great Bustards: Implications for Conservation and Species Status.

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First Recorded Observations of Pollination and Oviposition Behavior in <i>Tegeticula antithetica</i> (Lepidoptera: Prodoxidae) Suggest a Functional Basis for Coevolution With Joshua Tree (<i>Yucca</i>) Hosts.

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Population genomics of divergence within an obligate pollination mutualism: Selection maintains differences between Joshua tree species.

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Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea
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Strong Selection Against Early Generation Hybrids in Joshua Tree Hybrid Zone Not Explained by Pollinators Alone.

Anne M Royer1, Jackson Waite-Himmelwright2, Christopher Irwin Smith2

  • 1Biology Department, The University of Scranton, Scranton, PA, United States.

Frontiers in Plant Science
|June 13, 2020
PubMed
Summary

Joshua trees and yucca moths have a coevolved relationship. This study investigated if moth pollination maintains Joshua tree hybrid zones, finding reproductive isolation, not moths, keeps them narrow.

Keywords:
Joshua treeTegeticulaYuccacoevolutiongeographic clineshybrid zone

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Genetics

Background:

  • Obligate pollination mutualisms are crucial for diversification.
  • The role of these mutualisms in maintaining hybrid zones is understudied.
  • Joshua trees ( *Yucca* genus) and yucca moths exhibit a tightly coevolved pollination system.

Purpose of the Study:

  • To investigate if selection by yucca moths currently maintains separation in the Joshua tree hybrid zone.
  • To determine if pollinators actively maintain the hybrid zone or passively follow its boundaries.

Main Methods:

  • Geographic clines approach applied to the Joshua tree hybrid zone.
  • Comparison of genomic, phenotypic, and pollinator frequency clines.
  • Analysis of selection pressures on species separation.

Main Results:

  • Genomic and pollinator frequency clines show dramatic overlap, indicating a narrow hybrid zone maintained by strong selection.
  • Phenotypic clines are wider, and the chloroplast genomic cline is displaced in an unexpected direction.
  • Pollinators do not appear to be the primary source of selection maintaining the hybrid zone.

Conclusions:

  • High levels of reproductive isolation, involving multiple barriers and extensive genomic regions, are responsible for maintaining the narrow hybrid zone.
  • Yucca moths, despite their coevolutionary history, are not the main drivers of selection maintaining species separation in this hybrid zone.