Dispersion and Mobility in a Local Population of Spruce Grouse

Seasonal changes in aggressive behavior of female spruce grouse

“…Most female spruce grouse on the study area were radiotagged (Herzog 1977); thus it was possible to locate individuals readily for the playback experiments and to determine concurrently the daily spatial distribution of females on the study area. To determine their behavioral reactions to aggressive calls of another female, we used a taperecording of calls uttered by a female while attacking a female decoy, first recorded in the field by MacDonald (1968).…”

“…tion in the local population. Since Robe1 (1970) had suggested that aggressive behavior between females might play a role in regulating populations of greater prairie chickens (T~~mpmc'lus Herzog (1977).…”

“…As part of an investigation of the movements and dispersion of female spruce grouse (Herzog 1977), we recorded their responses in the field to a playback of a previously recorded aggressive female call (MacDonald 1968). Our objectives were to record any seasonal changes in the responses of individual females to the taperecorded call, to compare the responses of adult and yearling females, and to relate these responses to their movement and spatial distribuCan.…”

A test on social behavior as a cause of dispersal of spruce grouse

“…Spruce grouse inhabit northern coniferous forests across North America (Aldrich 1963). Both sexes are territorial in spring (Herzog and Boag 1978); males perform "flutter flights" (Lumsden 1961) and females give a cantus (Nugent and Boag 1982), both of which appear to promote solitary spacing of individuals of the same sex. The mating system is dispersed male dominance polygyny (Oring 1982): there is no pair bond; the female appears not to depend upon any physical resource of the male territory; only females provide parental care; sexes are dimorphic in color and size; and males probably exhibit delayed breeding (Wiley 1974) because yearlings generally do not show the same propensity for courtship and territoriality as adults (Szuba and Bendell 1988).…”

Comparaison de l'utilisation de différents types de structures de forêt résiduelle par le tétras du Canada (falcipennis canadensis) /

“…Les connaissances acquises par ces recherches concernent entre autres l'alimentation de l'oiseau (Jonkel et Gréer 1963 ;Ellison 1966 ;Pendergast et Boag 1970 ;Ellison 1976 ;Herzog 1978 ;Allan 1985 ;Hohf et al 1987 ;Naylor et Bendell 1989 ;DeFranceschi et Boag 1991), ses déplacements et mouvements migratoires (Schroeder 1985 ;Boag et Schroeder 1992), ses comportements sociaux (Ellison 1973 ;Herzog et Boag 1978 ;Nugent et Boag 1982 ;Keppie 1987a), ainsi que sa reproduction et sa productivité (Pendergast et Boag 1971 ;Keppie et Herzog 1978 ;Keppie 1982 ;Remond et al 1982) Les besoins du tétras du Canada en terme d'habitat sont assez bien connus. Le tétras est dépendant des forêts de conifères pour satisfaire à ses besoins vitaux (Turcotte et al 1993 Mill.)…”