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Population Dynamics and Flowering Synchrony of Goodyera pubescens (Orchidaceae) in Southwestern Quebec, Canada
Joyce M. Reddoch and Allan H. Reddoch
The Journal of the Torrey Botanical Society
Vol. 134, No. 3 (Jul. - Sep., 2007), pp. 379-388
Published by: Torrey Botanical Society
Stable URL: http://www.jstor.org/stable/20063929
Page Count: 10
You can always find the topics here!Topics: Flowering, Seedlings, Rain, Rhizomes, Species, Deer, Population growth, Doubling time, Herbivores, Plants
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Two populations of the clonal orchid Goodyera pubescens (Willd.) R. Br. were studied between 1976 and 2006 in Gatineau Park, Quebec, at the northern edge of the distribution. The species is ranked as "imperiled" in the province. Four life-history stages were identified: seed, juvenile/immature, flowering and vegetative. The populations, which were 5 km apart, expanded with doubling times of 7.5 and 15.9 years, the difference in doubling times being attributed to ongoing herbivory at the latter site. Inter-generational times for vegetative reproduction were 4-8 years, while none of the few juvenile/immature individuals monitored had flowered after 9 years. Large flowerings, of up to 30% of the rosettes in a patch, usually were spaced at intervals of 2-4 years. These large flowerings were synchronous within patches, among patches, and between populations. They occurred in the years that followed years with an extensive warm, dry period in May.
The Journal of the Torrey Botanical Society © 2007 Torrey Botanical Society