| An observation of Clostridium perfringens in Greater Sage-Grouse | Hagen, Christian A. | 2007 |
An observation of Clostridium perfringens in Greater Sage-GrouseKeywordsCentrocercus urophasianus
Clostridium perfringens
Greater Sage-Grouse
necrotic enteritis
Oregon AbstractMortality due to infectious diseases is seldom reported in the Greater Sage-Grouse (Centrocercus urophasianus). A case of necrotic enteritis associated with Clostr'dinrn per frinaens type A is described in a free-ranging adult finale sage-grouse in eastern Oregon. Clostridial enteritis is known to cause outbreaks of mortality in various domestic and wild birds, and should be considered as a potential cause of mortaliy in sage-grouse populations. AuthorsHagen, Christian A.; Bildfell, Robert J. Year Published2007 PublicationJournal of Wildlife Diseases Locations |
| Antelope, sage grouse, and Neotropical migrants. | Rothwell, Reg. | 1993 |
Antelope, sage grouse, and Neotropical migrants.KeywordsNo keywords available AbstractNo abstract available AuthorsRothwell, Reg. Year Published1993 PublicationU S Forest Service Locations |
| Are There Benefits to Mowing Wyoming Big Sagebrush Plant Communities? An Evaluation in Southeastern Oregon | Davies, Kirk W. | 2011 |
KeywordsAnnual grass Artemisia tridentata Bromus tectorum Brush control Brush management Sage-grouse AbstractWyoming big sagebrush (Artemisia tridentata ssp. wyomingensis Beetle & Young) communities frequently are mowed in an attempt to increase perennial herbaceous vegetation. However, there is limited information as to whether expected benefits of mowing are realized when applied to Wyoming big sagebrush communities with intact understory vegetation. We compared vegetation and soil nutrient concentrations in mowed and undisturbed reference plots in Wyoming big sagebrush plant communities at eight sites for three years post-treatment. Mowing generally did not increase perennial herbaceous vegetation cover, density, or biomass production (P > 0.05). Annual forbs and exotic annual grasses were generally greater in the mowed compared to the reference treatment (P < 0.05). By the third year post-treatment annual forb and annual grass biomass production was more than nine and sevenfold higher in the mowed than reference treatment, respectively. Our results imply that the application of mowing treatments in Wyoming big sagebrush plant communities does not increase perennial herbaceous vegetation, but may increase the risk that exotic annual grasses will dominate the herbaceous vegetation. We suggest that mowing Wyoming big sagebrush communities with intact understories does not produce the expected benefits. However, the applicability of our results to Wyoming big sagebrush communities with greater sagebrush cover and/or degraded understories needs to be evaluated. AuthorsDavies, Kirk W.; Bates, Jon D.; Nafus, Aleta M. Year Published2011 PublicationEnvironmental Management LocationsDOI10.1007/s00267-011-9715-3 |
| Assessing chick survival of sage-grouse in Canada. Final project report for 2000. | Aldridge, Cameron L. | 2000 |
Assessing chick survival of sage-grouse in Canada. Final project report for 2000.KeywordsNo keywords available AbstractThe Alberta greater sage-grouse population has declined by 66-92% over the last thirty years. Previous research in Alberta suggested that the population has declined as a result of poor recruitment. Low levels of recruitment appear to be linked to poor chick survival as a result of limited mesic sites important for brood rearing habitat. Due to the inaccuracies of brood flushing counts, and the limits of technology to produce transmitters small enough for chicks, it has been difficult to accurately assess and understand chick survival. A population model developed from data gathered in 1998 and 1999 suggested that the population would decrease in 2000, resulting in a decrease in the number of males observed on leks from 140 to 132. I counted 140 males at leks in 2000, suggesting that the population remained relatively stable, at between 420 and 622 individuals. While sample sizes were small, measures of productivity in 2000 were quite low compared to previous years, suggesting a better understanding of the variability in the parameters in the model is needed. I also performed a 2-stage pilot experiment, focusing on attaching transmitters to sage-grouse chicks. I first practiced the technique by suturing transmitters to 10 chicken chicks, and then tested the technique on 4 sage-grouse chicks in the field. The transmitters did not appear to harm the chicks at all, and none of them showed signs of infection, bleeding, or scaring from the transmitter attachment. This technique appears to be a viable method for assessing chick survival. AuthorsAldridge, Cameron L. Year Published2000 PublicationAlberta Species At Risk Report Locations |
| Assessing Compensatory Versus Additive Harvest Mortality: An Example Using Greater Sage-Grouse. | SEDINGER, JAMES S. | 2010 |
KeywordsCentrocercus urophasianus;compensatory harvest;exploitation;Markov chain Monte Carlo;survival AbstractWe used band-recovery data from 2 populations of greater sage-grouse (Centrocercus urophasianus), one in Colorado, USA, and another in Nevada, USA, to examine the relationship between harvest rates and annual survival. We used a Seber parameterization to estimate parameters for both populations. We estimated the process correlation between reporting rate and annual survival using Markov chain Monte Carlo methods implemented in Program MARK. If hunting mortality is additive to other mortality factors, then the process correlation between reporting and survival rates will be negative. Annual survival estimates for adult and juvenile greater sage-grouse in Nevada were 0.42 ± 0.07 (x ¯ ± SE) for both age classes, whereas estimates of reporting rate were 0.15 ± 0.02 and 0.16 ± 0.03 for the 2 age classes, respectively. For Colorado, average reporting rates were 0.14 ± 0.016, 0.14 ± 0.010, 0.19 ± 0.014, and 0.18 ± 0.014 for adult females, adult males, juvenile females, and juvenile males, respectively. Corresponding mean annual survival estimates were 0.59 ± 0.01, 0.37 ± 0.03, 0.78 ± 0.01, and 0.64 ± 0.03. Estimated process correlation between logit-transformed reporting and survival rates for greater sage-grouse in Colorado was ? = 0.68 ± 0.26, whereas that for Nevada was ? = 0.04 ± 0.58. We found no support for an additive effect of harvest on survival in either population, although the Nevada study likely had low power. This finding will assist mangers in establishing harvest regulations and otherwise managing greater sage-grouse populations. AuthorsSEDINGER, JAMES S., GARY C. WHITE, SHAWN ESPINOSA, ED T. PARTEE and CLAIT E. BRAUN. Year Published2010 PublicationJournal of Wildlife Management LocationsDOI10.2193/2009-071 |
| Attachment of radiotransmitters to one-day-old sage grouse chicks | Burkepile, NA | 2002 |
Attachment of radiotransmitters to one-day-old sage grouse chicksKeywordsCentrocercus urophasianus, chicks, radiotransmitters, sage grouse, telemetry AbstractOur understanding of cause- and age-specific mortality in sage grouse (Centrocercus urophasianus) chicks is limited due to their cryptic and secretive nature. Recent improvements in radiotransmitters have enhanced our ability to monitor sage grouse chicks as young as one day old. We describe a suturing method to attach radiotransmitters to one-day-old sage grouse chicks. During springs of 1999 and 2000, we attached radiotransmitters to 75 chicks from 28 broods and monitored them daily. Radiotransmitter retention rates were high, and there was no sign of infection on recaptured chicks. Using suturing to attach radiotransmitters is an effective means to collect ecological data on sage grouse chicks. AuthorsBurkepile, NA; Connelly, JW; Stanley, DW; Reese, KP Year Published2002 PublicationWildlife Society Bulletin Locations |
| Attendance at a Sage Grouse Lek: Implications for Spring Censuses | JENNI, DA | 1978 |
KeywordsNo keywords available AbstractNumbers
of
adult
male
sage
grouse
(Centrocercus
urophasianus)
increased
between
early
March
and
late
April-early
May.
Yearling
cocks
began
attending
in
numbers
when
female
numbers
peaked
in
early
April.
Hens
stayed
for
shorter
daily
and
seasonal
periods
than
cocks
did.
Data
on
seasonal
and
daily
attendance
confirm
the
validity
of
the
Patterson
census
technique,
but
suggest
that
it
is
more
restrictive
than
necessary.
Peak
numbers
of
cocks
can
be
estimated
to
within
90
percent
by
the
highest
of
3
counts
between
1/
hour
before
and
11/2
hours
after
sunrise
during
the
first
3
or
the
second
and
third
weeks
after
the
peak
of
breeding. AuthorsJENNI, DA; HARTZLER, JE Year Published1978 PublicationThe Journal of Wildlife Management LocationsDOI10.2307/3800688 |
| Availability of Foods of Sage Grouse Chicks following Prescribed Fire in Sagebrush-Bitterbrush | Pyle, WH | 1996 |
KeywordsNo keywords available AbstractA study was conducted to determine the influence of prescribed fire on the availability of primary foods of sage grouse (Centrocercus urophasianus Bonaparte) chicks at Hart Mountain National Antelope Refuge, Lake County, Ore, from 1987 to 1989. Responses of certain primary foods and general food categories to fire were evaluated in sagebrush (Artemisia tridentata ssp. vaseyana Beetle)-bitterbrush (Purshia tridentata Pursh.) communities with a randomized block design established in stands where shrub cover exceeded 35%. Within blocks, habitat response was evaluated far 2 growing seasons on 4 plots used as controls, 3 plots burned in November 1987, and 4 plots burned in March 1988. Fall burning increased (P < 0.05) frequency of taxa in the dandelion tribe (Cichoriene). Other primary foods, including microsteris (Microsteris gracilis Hook.), desert-parsley (Lomatium spp. Raf.), and ground-dwelling beetles (Scarabaeidae, Tenebrionidae) were not influenced by burning. Spring and fall burning increased (P < 0.05) total forb cover and diversity, but decreased (P < 0.05) sagebrush cover. Prescribed fire may increase the supply of forbs available to sage grouse in montane sagebrush habitats used for brood-rearing where shrubs dominate stands at the expense of the herbaceous component. AuthorsPyle, WH; Crawford, JA Year Published1996 PublicationJournal of Range Management LocationsDOI10.2307/4002590 |
| BALANCED SEX RATIO AT HATCH IN A GREATER SAGE-GROUSE (CENTROCERCUS UROPHASIANUS) POPULATION | Atamian, Michael T. | 2010 |
KeywordsCentrocercus urophasianus, CHD-gene, genetic sexing, Greater Sage-Grouse, parental investment, sex ratio. AbstractOnly one estimate of sex ratio at hatch exists for Greater Sage-Grouse (Centrocercus urophasianus). Managers typically assume a ratio at the population level of approximately 2:1 (female:male), primarily on the basis of sex ratio in the harvest. We determined the sex of newly hatched young and unhatched Greater Sage-Grouse by amplifying a portion of the sex-linked CHD gene. Sex ratio for Greater Sage-Grouse in east-central Nevada was 0.51 +/- 0.03 (SE; n = 272). We found no substantial difference in size between eggs that produced male chicks and those that produced females (44.5 + 0.2 mm(3) vs. 44.3 +/- 0.3 mm(3)) or between the masses of male and female chicks (25.8 +/- 0.3 g vs. 26.3 +/- 0.3 g), which suggests that energetic cost investments by females were similar between offspring of different sexes. We also found no effect of female condition oil differential investment in male versus female offspring. Given that adult survival does not differ Substantially between the sexes in our study Population (J. S. Sedinger unpubl. data), we suggest that this Population may not contain 2 adult females to I adult male and that any bias in adult sex ratio is likely attributable to differential survival from hatch to first breeding. Received 10 February 2009, accepted 1 june 2009. AuthorsAtamian, Michael T.; Sedingeir, James S. Year Published2010 PublicationThe Auk: Ornithological Advances LocationsDOI10.1525/auk.2009.09136 |
| Behavior of lekking sage grouse in response to a perched golden eagle. | Ellis, K.L. | 1984 |
Behavior of lekking sage grouse in response to a perched golden eagle.KeywordsNo keywords available AbstractNo abstract available AuthorsEllis, K.L. Year Published1984 PublicationWestern Birds Locations |
