Your browser doesn't support javascript.
loading
Rapid vertebrate speciation via isolation, bottlenecks, and drift.
Black, Andrew N; Heenkenda, Erangi J; Mathur, Samarth; Willoughby, Janna R; Pierce, Brian L; Turner, Sarah J; Rizzuto, David; DeWoody, J Andrew.
Afiliación
  • Black AN; Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907.
  • Heenkenda EJ; Western Association of Fish and Wildlife Agencies, Boise, ID 83719.
  • Mathur S; Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN 47907.
  • Willoughby JR; Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, OH 43210.
  • Pierce BL; College of Forestry, Wildlife, and Environment, Auburn University, Auburn, AL 36849.
  • Turner SJ; Natural Resources Institute, Texas A&M University, College Station, TX 77840.
  • Rizzuto D; Natural Resources Institute, Texas A&M University, College Station, TX 77840.
  • DeWoody JA; Natural Resources Institute, Texas A&M University, College Station, TX 77840.
Proc Natl Acad Sci U S A ; 121(22): e2320040121, 2024 May 28.
Article en En | MEDLINE | ID: mdl-38771882
ABSTRACT
Speciation is often driven by selective processes like those associated with viability, mate choice, or local adaptation, and "speciation genes" have been identified in many eukaryotic lineages. In contrast, neutral processes are rarely considered as the primary drivers of speciation, especially over short evolutionary timeframes. Here, we describe a rapid vertebrate speciation event driven primarily by genetic drift. The White Sands pupfish (Cyprinodon tularosa) is endemic to New Mexico's Tularosa Basin where the species is currently managed as two Evolutionarily significant units (ESUs) and is of international conservation concern (Endangered). Whole-genome resequencing data from each ESU showed remarkably high and uniform levels of differentiation across the entire genome (global FST ≈ 0.40). Despite inhabiting ecologically dissimilar springs and streams, our whole-genome analysis revealed no discrete islands of divergence indicative of strong selection, even when we focused on an array of candidate genes. Demographic modeling of the joint allele frequency spectrum indicates the two ESUs split only ~4 to 5 kya and that both ESUs have undergone major bottlenecks within the last 2.5 millennia. Our results indicate the genome-wide disparities between the two ESUs are not driven by divergent selection but by neutral drift due to small population sizes, geographic isolation, and repeated bottlenecks. While rapid speciation is often driven by natural or sexual selection, here we show that isolation and drift have led to speciation within a few thousand generations. We discuss these evolutionary insights in light of the conservation management challenges they pose.
Asunto(s)
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Flujo Genético / Especiación Genética Límite: Animals País/Región como asunto: America do norte Idioma: En Revista: Proc Natl Acad Sci U S A Año: 2024 Tipo del documento: Article 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 Asunto principal: Flujo Genético / Especiación Genética Límite: Animals País/Región como asunto: America do norte Idioma: En Revista: Proc Natl Acad Sci U S A Año: 2024 Tipo del documento: Article Pais de publicación: Estados Unidos