BergeronLeducLi1997

Reference

Bergeron, Y., Leduc, A. and Li, T.X. (1997) Explaining the distribution of Pinus spp. in a Canadian boreal insularlandscape. Journal of Vegetation Science, 8(1):37-44.

Abstract

To evaluate the respective contributions of habitat, fire regime andcolonization-extinction processes to the distribution of northernPinus species, we investigated the distribution of P. banksiana(jack pine), P. resinosa (red pine) and P. strobus (while pine)on 117 islands of Lake Duparquet in northwestern Quebec. Stepwiselogistic regressions indicated that the extent of xeric areas onthe islands was the sole factor predicting jack pine distribution.The distribution of while pine was predicted primarily by the combinedeffects of distance to the shoreline and elevation, with a smallereffect of area of xeric habitat. The distribution of red pine waspredicted by other populations of red pine nearby, with a slightlysmaller effect of the combined effects of distance to shorelineand elevation. None of the species completely saturates all availableislands nor is any restricted to specific, very exposed aspects.The results suggest that pine is more frequent on islands with characteristicsthat promote lightning strikes and thus higher fire occurrence.However, absence of pine in several islands may not be explainedby abiotic characteristics or recent fire history. The presenceof very small populations, together with low invasion potential,suggests that the observed distribution is mainly driven by theprocess of random extinction. A disequilibrium between present andpast fire regimes may explain why northern pines have discontinousdistributions inside their range limits.

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@ARTICLE { BergeronLeducLi1997,
    AUTHOR = { Bergeron, Y. and Leduc, A. and Li, T.X. },
    TITLE = { Explaining the distribution of Pinus spp. in a Canadian boreal insularlandscape },
    JOURNAL = { Journal of Vegetation Science },
    YEAR = { 1997 },
    VOLUME = { 8 },
    PAGES = { 37-44 },
    NUMBER = { 1 },
    ABSTRACT = { To evaluate the respective contributions of habitat, fire regime andcolonization-extinction processes to the distribution of northernPinus species, we investigated the distribution of P. banksiana(jack pine), P. resinosa (red pine) and P. strobus (while pine)on 117 islands of Lake Duparquet in northwestern Quebec. Stepwiselogistic regressions indicated that the extent of xeric areas onthe islands was the sole factor predicting jack pine distribution.The distribution of while pine was predicted primarily by the combinedeffects of distance to the shoreline and elevation, with a smallereffect of area of xeric habitat. The distribution of red pine waspredicted by other populations of red pine nearby, with a slightlysmaller effect of the combined effects of distance to shorelineand elevation. None of the species completely saturates all availableislands nor is any restricted to specific, very exposed aspects.The results suggest that pine is more frequent on islands with characteristicsthat promote lightning strikes and thus higher fire occurrence.However, absence of pine in several islands may not be explainedby abiotic characteristics or recent fire history. The presenceof very small populations, together with low invasion potential,suggests that the observed distribution is mainly driven by theprocess of random extinction. A disequilibrium between present andpast fire regimes may explain why northern pines have discontinousdistributions inside their range limits. },
    KEYWORDS = { Boreal forest Fire regime Insular biogeography Pinus banksiana Pinusresinosa Pinus strobus Quebec Pinus Pinaceae Pinus banksiana Pinusresinosa Pinus strobus fire regime insular biogeography lake islandpine spatial distribution xeric habitat Canada, Quebec, Lake Duparquet },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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