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Lineage diversification and rampant hybridization among subspecies explain taxonomic confusion in the endemic Hawaiian fern Polypodium pellucidum.
Mendez-Reneau, Jonas I; Richards, Joseph L; Hobbie, Julia; Bollich, Emily; Kooyers, Nicholas J; Sigel, Erin M.
Afiliación
  • Mendez-Reneau JI; Department of Biology, University of Louisiana at Lafayette, 410 East St. Mary Boulevard, Billeaud Hall, Lafayette, 70504, LA, USA.
  • Richards JL; Department of Biology, University of Louisiana at Lafayette, 410 East St. Mary Boulevard, Billeaud Hall, Lafayette, 70504, LA, USA.
  • Hobbie J; Department of Biology, Utah State University, BNR 117, 5305 Old Main Hill, Logan, 84322, UT, USA.
  • Bollich E; Department of Biology, University of Louisiana at Lafayette, 410 East St. Mary Boulevard, Billeaud Hall, Lafayette, 70504, LA, USA.
  • Kooyers NJ; Department of Biology, University of Louisiana at Lafayette, 410 East St. Mary Boulevard, Billeaud Hall, Lafayette, 70504, LA, USA.
  • Sigel EM; Department of Biological Sciences, University of New Hampshire, 105 Main St., Durham, 03824, NH, USA.
Am J Bot ; : e16379, 2024 Jul 30.
Article en En | MEDLINE | ID: mdl-39081002
ABSTRACT
PREMISE Polypodium pellucidum, a fern endemic to the Hawaiian Islands, encompasses five ecologically and morphologically variable subspecies, suggesting a complex history involving both rapid divergence and rampant hybridization.

METHODS:

We employed a large target-capture data set to investigate the evolution of genetic, morphological, and ecological variation in P. pellucidum. With a broad sampling across five Hawaiian Islands, we deciphered the evolutionary history of P. pellucidum, identified nonhybrid lineages and intraspecific hybrids, and inferred the relative influence of geography and ecology on their distributions.

RESULTS:

Polypodium pellucidum is monophyletic, dispersing to the Hawaiian archipelago 11.53-7.77 Ma and diversifying into extant clades between 5.66 and 4.73 Ma. We identified four nonhybrid clades with unique morphologies, ecological niches, and distributions. Additionally, we elucidated several intraspecific hybrid combinations and evidence for undiscovered or extinct "ghost" lineages contributing to extant hybrid populations.

CONCLUSIONS:

We provide a foundation for revising the taxonomy of P. pellucidum to account for cryptic lineages and intraspecific hybrids. Geologic succession of the Hawaiian Islands through cycles of volcanism, vegetative succession, and erosion has determined the available habitats and distribution of ecologically specific, divergent clades within P. pellucidum. Intraspecific hybrids have likely arisen due to ecological and or geological transitions, often persisting after the local extinction of their progenitors. This research contributes to our understanding of the evolution of Hawai'i's diverse fern flora and illuminated cryptic taxa to allow better-informed conservation efforts.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Am J Bot Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Am J Bot Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos