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    Author(s): S.A.M Manley; F. Thomas Ledig
    Date: 1979
    Source: Canadian Journal of Botany 57(4):305-314
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.6 MB)


    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.

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    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

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