Red Squirrel Population Dynamics I. The Effect of Supplemental Food on Demography

10.2307/5425 ◽  
1991 ◽  
Vol 60 (3) ◽  
pp. 961 ◽  
Author(s):  
Walt Klenner ◽  
Charles J. Krebs
Keyword(s):  
Population Dynamics ◽  
Red Squirrel ◽  
Supplemental Food

Population dynamics and regulation of the Douglas squirrel (Tamiasciurus douglasii) with supplemental food

Oecologia ◽  
1982 ◽  
Vol 53 (2) ◽  
pp. 264-270 ◽  
Author(s):  
Thomas P. Sullivan ◽  
Druscilla S. Sullivan
Keyword(s):  
Population Dynamics ◽  
Supplemental Food

scholarly journals Effects of Supplemental Food on Population Dynamics of Cotton Rats, Sigmodon Hispidus

Ecology ◽  
1995 ◽  
Vol 76 (3) ◽  
pp. 814-826 ◽  
Author(s):  
Terry J. Doonan ◽  
Norman A. Slade
Keyword(s):  
Population Dynamics ◽  
Sigmodon Hispidus ◽  
Supplemental Food ◽  
Cotton Rats

On the existence, uniqueness and computational analysis of a fractional order spatial model for the squirrel population dynamics under the Atangana-Baleanu-Caputo operator

2021 ◽  
Vol 8 (3) ◽  
pp. 432-443
Author(s):  
O. M. Ogunmiloro ◽  
◽  
S. E. Fadugba ◽  
E. O. Titiloye ◽  
◽  
...  
Keyword(s):  
Population Dynamics ◽  
Fractional Order ◽  
Spatial Model ◽  
Computational Cost ◽  
Red Squirrel ◽  
Transform Method ◽  
Red Squirrels ◽  
Order Analysis ◽  
Differential Transform ◽  
Low Computational Cost

In this paper, we examine the fractional order analysis of a diffusion competition spatial model describing the interactions between the externally introduced grey and local red squirrel under the Atangana-Baleanu-Caputo (ABC) sense. Also, we establish the existence and uniqueness analysis of the fractional order spatial model of the squirrel population dynamics, while the numerical computation of the fractional order spatial model is carried out using the two dimensional Fractional Order Differential Transform Method (FODTM). Simulations of the variables of the model reveal that as the system evolves, the grey squirrels increase in density with increase in time, while the red squirrels decrease in density with increase in time. Also the simulations show that the FODTM is efficient and convergent with low computational cost.

The influence of food resources on population dynamics in Columbian ground squirrels

1985 ◽  
Vol 63 (9) ◽  
pp. 2095-2104 ◽  
Author(s):  
F. Stephen Dobson ◽  
Julia D. Kjelgaard
Keyword(s):  
Population Dynamics ◽  
Environmental Factors ◽  
Population Size ◽  
Ground Squirrel ◽  
Food Resources ◽  
Ground Squirrels ◽  
Limiting Factors ◽  
Supplemental Food ◽  
Survival And Reproduction ◽  
Population Processes

Determining the environmental factors that limit the size of populations and examining the influence of environmental factors on population processes (immigration, emigration, survival, and reproduction) are fundamental problems for population ecologists. We conducted an experimental study of population dynamics in the Columbian ground squirrel, Spermophilus columbianus, from 1981 to 1983, in southwestern Alberta, Canada. We supplemented the food resources of two local populations of ground squirrels at different elevations and also monitored two reference (unsupplemented) populations. Population size increased by about 85% annually and population biomass increased by about 94% annually where supplemental food was provided. Reference populations varied in numbers and biomass by less than 40% annually. Because the increase in size of supplemented populations was dramatic, we concluded that food resources probably limited the size of the ground squirrel populations before we began the experiments and that other possible limiting factors were insufficient to check the increases stimulated by supplemental food. Several population processes were influenced by the increased food resources. Immigration of all age-classes was higher to supplemented than to reference populations and favored females. Survival of resident young was higher in supplemented than in reference populations. Reproduction was greatly increased in supplemented populations compared with reference populations, with surviving young residents of 1982 making the greatest contribution to increases in population size. The results were generally similar in the two replicates of the experiment. Competition for food resources appeared to be strongest among yearling and adult females and among young of both sexes.

scholarly journals European red squirrel population dynamics driven by squirrelpox at a gray squirrel invasion interface

2014 ◽  
Vol 4 (19) ◽  
pp. 3788-3799 ◽  
Author(s):  
Julian Chantrey ◽  
Timothy D. Dale ◽  
Jonathan M. Read ◽  
Steve White ◽  
Fiona Whitfield ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Gray Squirrel ◽  
Red Squirrel
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