| Endogenous Reserves of Adult Male Sage Grouse during Courtship | HUPP, JW | 1989 |
KeywordsAvian energetics; breeding behavior; Centrocercus urophasianus; Colorado; lipids; Sage Grouse AbstractLipid reserves of 116 adult (> 1 year of age) male Sage Grouse (Centrocercus
urophasianus) were evaluated in two Colorado populations during lek attendance between
1983 and 1986. Lipid reserves following winters (November-March) with snowfalls < 0.001) than reserves following winters with snowfalls > 160 cm. Lipid
reserves during early courtship were larger than reserves during late courtship (P < 0.001).
Males catabolized lipids during courtship but did not use breast muscle protein. Catabolism
of lipids likely provides < 5% of male energetic requirements during courtship. An adaptive
advantage to fat deposition before breeding may exist if males primarily mobilize lipids
during the peak period of female lek attendance when male reproductive success is determined, or during periods when thermoregulatory costs are high due to low ambient temperatures or wind. AuthorsHUPP, JW; BRAUN, CE Year Published1989 PublicationThe Condor: Ornithological Applications LocationsDOI10.2307/1368303 |
| Dispersion of displaying male sage grouse | BRADBURY, JW | 1989 |
KeywordsNo keywords available AbstractThe degree to which male sage grouse select lek sites and females select nesting sites to maximize proximity to the other sex was examined by contrasting male dispersions with the dispersions and movements of females in the months preceeding incubation. Wintering females exhibit highly overlapping ranges due to shared use of central refuging areas. In late winter and early spring, females move an average 9 km from wintering areas to select nest sites and males begin occupying leks. Pooled evidence suggests that females select nest sites independently of male dispersion whereas males adjust lek occupation so as to maximize proximity to females. Relevant observations include females visiting nest sites before leks, moving further to select a nest site than to select a lek, and increasing their distance to leks as a result of selecting nest sites. In addition, males avoid leks until females have moved to within 5 km of the arenas, abandon early season leks as local female densities drop, and exhibit dispersions in which mean ratios of females/male are similar across leks. Contrasts between predicted and observed dispersions of males showed that hotspot settlement models are adequate to explain male dispersions on very coarse scales (2 km or greater); on finer scales, habitat preferences of males and tendencies for males to cluster tightly must be invoked in addition to hotspots to explain specific lek sitings. AuthorsBRADBURY, JW; GIBSON, RM; MCCARTHY, CE; VEHRENCAMP, SL Year Published1989 PublicationBehavioral Ecology And Sociobiology LocationsDOI10.1007/BF00300113 |
| TOPOGRAPHIC DISTRIBUTION OF SAGE GROUSE FORAGING IN WINTER | HUPP, JW | 1989 |
KeywordsNo keywords available AbstractWe studied sagebrush (Artemisia spp.) exposure above snow and topographic distribution of sage grouse (Centrocercus urophasianus) foraging sites in winter (Jan-Mar) in the Gunnison Basin, Colorado. Sage grouse feeding activity (n = 157 foraging sites) was not proportionally distributed among 5 topographic categories (P < 0.001). Most (46 and 75% of foraging sites in 1985 and 1986, respectively) feeding activity occurred in drainages and on slopes with south or west aspects. Use of slopes with north or east aspects was less than expected. Distribution of sage grouse feeding activity was influenced by topographic variation in snow depth and mountain big sagebrush (A. tridentata vaseyana) exposure above snow. During a severe
winter in 1984, <10% of the sagebrush vegetation in the Gunnison Basin was exposed above snow and available to sage grouse. During milder winters in 1985 and 1986, exposure of sagebrush was 84 and 79%, respectively. We recommend that sagebrush be maintained in drainages and on slopes with south or west aspects. AuthorsHUPP, JW; BRAUN, CE Year Published1989 PublicationJournal of Wildlife Management LocationsDOI10.2307/3809220 |
| Effects of Organophosphorus Insecticides on Sage Grouse in Southeastern Idaho | BLUS, LJ | 1989 |
KeywordsNo keywords available AbstractDie-offs of sage grouse (Centrocercus urophasianus) were verified in southeastern Idaho in 1981.
We captured 82 apparently healthy grouse to quantify the effects of organophosphorus insecticides (OP's)
and other pesticides on sage grouse in sagebrush (Artemisia spp.) bordering agricultural lands in July 1985 and 1986. Grouse were fitted with radio collars and tracked through part of each summer. At least 18% of 82 radio-tagged grouse in 1985-86 subsequently occupied fields at the time they were sprayed with OP
insecticides dimethoate or methamidophos. Cholinesterase (ChE) assays of brains and residue analysis of crop contents indicated that 5 and 16% of the marked sample died from OP's in 1985 and 1986, respectively. Approximately 200 sage grouse were present in a block of alfalfa sprayed with dimethoate; 63 of these were later found dead and ChE activity in 43 brains suitable for assay were depressed >50%. Maximum residues in crop contents of dead grouse were 18 Ag/g methamidophos and 30 g/g dimethoate. Intoxicated or dead grouse were observed in or near 6 fields sprayed with dimethoate or methamidophos in 1985-86. Twenty of 31 intoxicated grouse radiotagged after being found in dimethoate-sprayed (1986) alfalfa died. Our study indicates that certain pesticides have the potential for adversely affecting grouse populations. AuthorsBLUS, LJ; STALEY, CS; HENNY, CJ; PENDLETON, GW; CRAIG, TH; CRAIG, EH; HALFORD, DK Year Published1989 PublicationThe Journal of Wildlife Management LocationsDOI10.2307/3809623 |
| THE ENERGETIC COST OF DISPLAY IN MALE SAGE GROUSE | VEHRENCAMP, SL | 1989 |
THE ENERGETIC COST OF DISPLAY IN MALE SAGE GROUSEKeywordsNo keywords available AbstractNo abstract available AuthorsVEHRENCAMP, SL; BRADBURY, JW; GIBSON, RM Year Published1989 PublicationAnimal Behaviour Locations |
| HABITAT USE BY BREEDING MALE SAGE GROUSE - A MANAGEMENT APPROACH | ELLIS, KL | 1989 |
HABITAT USE BY BREEDING MALE SAGE GROUSE - A MANAGEMENT APPROACHKeywordsNo keywords available AbstractNo abstract available AuthorsELLIS, KL; PARRISH, JR; MURPHY, JR; RICHINS, GH Year Published1989 PublicationGreat Basin Naturalist Locations |
| COMPARISON OF SAGE AND SHARP-TAILED GROUSE LEKS IN SOUTH CENTRAL WYOMING | KLOTT, JH | 1989 |
COMPARISON OF SAGE AND SHARP-TAILED GROUSE LEKS IN SOUTH CENTRAL WYOMINGKeywordsNo keywords available AbstractNo abstract available AuthorsKLOTT, JH; LINDZEY, FG Year Published1989 PublicationGreat Basin Naturalist Locations |
| MONOTERPENOID CONTENT OF SAGE GROUSE INGESTA | WELCH, BL | 1989 |
MONOTERPENOID CONTENT OF SAGE GROUSE INGESTAKeywordsNo keywords available AbstractNo abstract available AuthorsWELCH, BL; PEDERSON, JC; RODRIGUEZ, RL Year Published1989 PublicationJournal of Chemical Ecology Locations |
| DISPERSION OF DISPLAYING MALE SAGE GROUSE .1. PATTERNS OF TEMPORAL VARIATION | BRADBURY, JW | 1989 |
DISPERSION OF DISPLAYING MALE SAGE GROUSE .1. PATTERNS OF TEMPORAL VARIATIONKeywordsNo keywords available AbstractNo abstract available AuthorsBRADBURY, JW; VEHRENCAMP, SL; GIBSON, RM Year Published1989 PublicationBehavioral Ecology And Sociobiology Locations |
| FIELD PLAYBACK OF MALE DISPLAY ATTRACTS FEMALES IN LEK BREEDING SAGE GROUSE | GIBSON, RM | 1989 |
FIELD PLAYBACK OF MALE DISPLAY ATTRACTS FEMALES IN LEK BREEDING SAGE GROUSEKeywordsNo keywords available AbstractNo abstract available AuthorsGIBSON, RM Year Published1989 PublicationBehavioral Ecology And Sociobiology Locations |
