Using Phenology to Predict Commencement of Nesting of Female Spruce Grouse (Dendragapus canadensis)

Dates for loss of snow cover and beginning of plant growth were evaluated with respect to median dates for commencement of egg-laying and hatch of clutches by female spruce grouse (Dendragapus canadensis) in three widely separated localities in Canada. Female spruce grouse begin to lay eggs at a tim...

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Published in:The American midland naturalist 1990-07, Vol.124 (1), p.164-170
Main Authors: Keppie, Daniel M., Towers, Julie
Format: Article
Language:English
Subjects:
Animal behavior
Animal nesting
Birds
Budbreak
Correlations
Eggs
Female animals
Grouse
Phenology
Plants
Seasons
Snow cover
Statistical median
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Towers, Julie
description Dates for loss of snow cover and beginning of plant growth were evaluated with respect to median dates for commencement of egg-laying and hatch of clutches by female spruce grouse (Dendragapus canadensis) in three widely separated localities in Canada. Female spruce grouse begin to lay eggs at a time when environmental conditions are predictable as witnessed by low variation in calendar dates among years in phenological events. Among the events that we monitored, the dates for first flowers of blueberry (Vaccinium angustifolium) and trailing arbutus (Epigaea repens) and the dates for 50% snow cover were correlated best with median dates for commencement of egg-laying and hatch of clutches. Median nesting dates can be predicted well by these events. There is now circumstantial evidence that timing of plant development influences commencement times for egg-laying.
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source JSTOR Archival Journals and Primary Sources Collection
subjects Animal behavior
Animal nesting
Birds
Budbreak
Correlations
Eggs
Female animals
Grouse
Phenology
Plants
Seasons
Snow cover
Statistical median
title Using Phenology to Predict Commencement of Nesting of Female Spruce Grouse (Dendragapus canadensis)
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