Pacific Southwest

Title: Photosynthesis in black and red spruce and their hybrid derivatives: ecological isolation and hybrid adaptive inferiority

Author: Manley, S.A.M; Ledig, F. Thomas

Date: 1979

Source: Canadian Journal of Botany 57(4):305-314

Description: Photosynthetic response5 of black and red spruce were used to define parameters of their fundamental niches. Grown at warm temperature, black spruce had highest rates of CO₂ uptake at high light intensities, fitting it for a pioneering role, while red spruce had the lowest light compensation point, fitting it for a late successional role. Black and red spruce responded in different ways to low temperature acclimation. Low temperature, low light (12°C, 100 ft-c (1 ft-c = 10.7641x)) acclimation stimulated C0₂ uptake in black spruce under all conditions while it depressed CO₂ uptake in red spruce relative to rates following high temperature (26°C) acclimation. Niches defined by photosynthetic responses corresponded to observed habitats in the area of sympatry of black and red spruce and demonstrated the existence of ecological isolation, a premating restriction to hybridization.

Keywords: 

View and Print this Publication (1.6 MB)

Pristine Version:  An uncaptured or "pristine" version of this publication is available. It has not been subjected to OCR (Optical Character Recognition) and therefore does not have any errors in the text. However it is a larger file size and some people may experience long download times. The "pristine" version of this publication is available here:

View and Print the PRISTINE copy of this Publication (3.2 MB)

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

Manley, S.A.M; Ledig, F. Thomas  1979.  Photosynthesis in black and red spruce and their hybrid derivatives: ecological isolation and hybrid adaptive inferiority.   Canadian Journal of Botany 57(4):305-314.