Sensitivity of willow grouse Lagopus lagopus population dynamics to variations in demographic parameters

1996 ◽  
Vol 2 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Harald Steen ◽  
Kjell Einar Erikstad
Keyword(s):  
Population Dynamics ◽  
Demographic Parameters ◽  
Lagopus Lagopus ◽  
Willow Grouse

scholarly journals Thermoregulatory Behavior and Body Temperature in Chicks of Willow Grouse (Lagopus Lagopus Lagopus)

1975 ◽  
Vol 54 (4) ◽  
pp. 1174-1179 ◽  
Author(s):  
Kjell Myhre ◽  
Michel Cabanac ◽  
Grete Myhre
Keyword(s):  
Body Temperature ◽  
Thermoregulatory Behavior ◽  
Lagopus Lagopus ◽  
Willow Grouse

“Emotional” Bradycardia: A Telemetry Study on Incubating Willow Grouse (Lagopus lagopus)

1977 ◽  
Vol 100 (2) ◽  
pp. 255-257 ◽  
Author(s):  
Geir Gabrielsen ◽  
John Kanwisher ◽  
Johan B. Steen
Keyword(s):  
Lagopus Lagopus ◽  
Willow Grouse

Population dynamics of island populations of subarctic Clethrionomys rutilus

1981 ◽  
Vol 59 (11) ◽  
pp. 2115-2122 ◽  
Author(s):  
Gordon R. Burns
Keyword(s):  
Population Dynamics ◽  
Breeding Season ◽  
Growth Potential ◽  
Demographic Parameters ◽  
Juvenile Survival ◽  
Island Populations ◽  
Clethrionomys Rutilus ◽  
Green Island ◽  
Mackenzie River

Populations of Clethrionomys rutilus were studied on two islands (Island 2 and Green Island) in the Mackenzie River during the summers of 1976 to 1978. This was done to examine the demographic parameters related to confinement of northern red-backed vole populations on islands.The number of voles on Island 2 in 1977 increased until late June and then remained nearly constant until trapping ceased in late August. On Green Island in 1977 and 1978 and Island 2 in 1978, populations grew all summer and even in August had not reached the densities found during the 1977 high on Island 2. Island 2 in 1977 had an unusually low number of maturing young voles. Higher wounding rates and shorter adjusted range lengths were associated with higher population densities.Although high densities of voles were reached early in the summer of 1977 on Island 2, numbers stopped increasing before the end of the breeding season. Restraint of growth potential was seen in poor maturation of the young and in declining juvenile survival and recruitment of young through summer.

scholarly journals Dealing with many correlated covariates in capture-recapture models

2016 ◽  
Author(s):  
Olivier Gimenez ◽  
Christophe Barbraud
Keyword(s):  
Principal Component Analysis ◽  
Population Dynamics ◽  
Statistical Significance ◽  
Principal Component ◽  
High Dimensionality ◽  
Demographic Parameters ◽  
Statistical Tools ◽  
Capture Recapture ◽  
New Variables ◽  
Standard Software

SummaryCapture-recapture models for estimating demographic parameters allow covariates to be incorporated to better understand population dynamics. However, high-dimensionality and multicollinearity can hamper estimation and inference. Principal component analysis is incorporated within capture-recapture models and used to reduce the number of predictors into uncorrelated synthetic new variables. Principal components are selected by sequentially assessing their statistical significance. We provide an example on seabird survival to illustrate our approach. Our method requires standard statistical tools, which permits an efficient and easy implementation using standard software.

The effects of hunting on willow grouse Lagopus lagopus movements

1996 ◽  
Vol 2 (1) ◽  
pp. 11-15 ◽  
Author(s):  
Gert E. Olsson ◽  
Tomas Willebrand ◽  
A. Adam Smith
Keyword(s):  
Lagopus Lagopus ◽  
Willow Grouse
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