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

Modeling Impacts and Costs of Gray Squirrel Control Regimes on the Viability of Red Squirrel Populations

2002 ◽  
Vol 66 (3) ◽  
pp. 683 ◽  
Author(s):  
Stephen P. Rushton ◽  
John Gurnell ◽  
Peter W. W. Lurz ◽  
Robin M. Fuller
Keyword(s):  
Gray Squirrel ◽  
Red Squirrel

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.

scholarly journals A Comparative Study of Intramuscular Alfaxalone- or Ketamine-Based Anesthetic Mixtures in Gray Squirrels Undergoing Gonadectomy: Clinical and Physiologic Findings

Animals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1402 ◽  
Author(s):  
Sara Nannarone ◽  
Giulia Moretti ◽  
Federica Bellocchi ◽  
Laura Menchetti ◽  
Antonello Bufalari
Keyword(s):  
Invasive Species ◽  
Cardiovascular Effects ◽  
Gray Squirrel ◽  
Red Squirrel ◽  
Anesthetic Drug ◽  
Complete Relaxation ◽  
Surgical Sterilization ◽  
Physiologic Parameters ◽  
Intravascular Access

The gray squirrel is one of the most common invasive species in Europe, whose presence is dangerous for the survival of the European red squirrel. To cope with this biological invasion and to safeguard biodiversity, the LIFE+U-SAVEREDS project aims to protect the red squirrel, by limiting the growth of the current population of gray squirrels and simultaneously promoting their eradication with surgical sterilization. This study compares two different anesthetic protocols, including dexmedetomidine (40 µg/kg) and midazolam (0.3 mg/kg) associated with ketamine (15 mg/kg; n = 25 squirrels) or alfaxalone (5 mg/kg; n = 22 squirrels). A blinded investigator evaluated the quality and onset of sedation, intraoperative anesthesia, and recovery, as well as the physiologic parameters for each animal. Alfaxalone provided a good quality of anesthesia with limited cardiovascular effects (p < 0.05) and good intraoperative myorelaxation. Ketamine induced complete relaxation in a shorter time (p < 0.05) and a rapid (p < 0.001) and excellent (p < 0.05) recovery. Despite the overall superiority of ketamine, alfaxalone appeared to be an adequate alternative anesthetic drug that can be administered without requiring intravascular access. It should be rapidly metabolized and excreted; however, it requires the combination of longer acting sedatives/myorelaxants to prevent a poor recovery quality.

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