Pacific Southwest

Title: Relationships among the spruces (Picea, Pinaceae) of southwestern North America

Author: Ledig, F. Thomas; Hodgskiss, Paul D.; Krutovskii, Konstanin V.; Neale, David B.; Eguiluz-Piedra, Teobaldo

Date: 2004

Source: Systematic Biology 29(2):275-295

Description: Numerous populations from six spruce taxa, including four relict endemics, Picea chihuahuana (Chihuahua spruce), P. martinezii (Martínez spruce), P. mexicana (Mexican spruce), and P. breweriana (Brewer spruce), and two widespread species, P. engelmannii (Engelmann spruce) and P. pungens (blue spruce), were compared at homologous isozyme loci to test various hypotheses about their afŽfinities and origins. Each of the species was clearly separated, and Neighbor-Joining and Unweighted Pair Group analyses of NeiÂ’s genetic distance grouped all populations within a taxon into their own clusters. Spruces from Flys Peak, Chiricahua Mountains, Arizona, joined a P. engelmannii cluster and were not a bridge to P. mexicana as previously believed. Spruces from Cerro Mohinora, Chihuahua, were clearly P. mexicana, not phantom hybrids of P. chihuahuana and P. pungens. Nuclear random ampliŽed polymorphic DNA and chloroplast simple sequence repeat and cleaved ampliŽed polymorphic genetic markers were compared in a smaller sample of populations, using distance and parsimony approaches. DNA markers, like isozymes, clearly identiŽed spruces from Cerro Mohinora as P. mexicana.

Keywords: 

View and Print this Publication (533 KB)

Publication Notes: 

• We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
• This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

 Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

Citation

Ledig, F. Thomas; Hodgskiss, Paul D.; Krutovskii, Konstanin V.; Neale, David B.; Eguiluz-Piedra, Teobaldo  2004.  Relationships among the spruces (Picea, Pinaceae) of southwestern North America.   Systematic Biology 29(2):275-295.