Colored fox in Labrador
year population counts Predictor t-ratio P X t-1 0.25 0.801 NS = 0.2%. This means that our regression does not work any better than using average log-density. 2. Two factors: population counts in two previous years Predictor t-ratio P X t-1 0.35 0.728 NS X t-2 2.73 0.010 = 16.8%.
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Lab. 7. Stability analysis
capacity K= 1000. 1.Run the model with r=0.2 for 80 generations starting from N o = 1. Plot the graph, explain why it has the S-shape. 2 ... stability. Run the model with parameter r=0.05; 0.1; 0.2, 0.3;... 1.9, 1.95 and find relaxation time using N o = 900 as initial density. Plot
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Synchronization of outbreaks
Synchronization of Outbreaks Examples of synchronized outbreaks: Defoliation caused by the gypsy moth , Lymantria dispar L., in Massachusetts in 1971-86. From Liebhold and Elkinton (1989; Forest Sci. 35: 557-568). Outbreak of the mountain pine beetle , Dendroctonus ponderosae
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Sequential sampling plan for the gypsy moth
Lab 3. Sequential sampling plan for the gypsy moth 1. Save the file " gmegg90.txt " in the student's folder or any other temporary folder. ... areas to spray by pesticides in order to prevent defoliation. Use the following parameters: Low population threshold = 1200 egg masses per
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Review
of the month", August 1997 Quantitative Population Ecology , by A. Sharov, Dept. of Entomology, Virginia Tech, Blacksburg, USA. True online ... Teaching, Education & Courses" of PPIGB. See the Readers's Review of this Website (below). Teaching, Education & Courses: Quantitative Population
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Correlation between population density and factors
predict population numbers in the future or in unsampled spatial locations. Data may be of 3 types: Time series - a sequence of measurements at the same point in space Spatial series - a set of measurements made (simultaneously or not) at different points in space Mixed series - a set
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Improved degree-day model
days are equal to the area under the temperature curve restricted to the temperature interval between t min and t max : Light-blue area equals to ... min . Another example: Light-blue area again equals to accumulated degree-days. Daily maximum temperature exceeds t max however this excess
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Attractors and Their Types
called " attractor " because model trajectories converge to this asymptotic trajectory. There may be several attractors in a model. In this case each attractor has a domain of attraction . Model trajectory converges to that attractor in which domain initial conditions were located. In
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Questions and Assignments 8
8.8. Questions and Assignments to Lecture 8 . 8.1 Insect development rate. Development of pea weevil ( Bruchus pisorum ) eggs was studied in the laboratory at constant temperatures (Smith, A.M. 1992. Environ. Entomol. 21:314-321): Temperature, C Egg development time, days 10
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https://greenlab.unibo.it/../quest3.html
how to determine the additional number of samples? 3.4. Taylor's power law for the number of fleas on rats is: ln(s ) = 0.1 + 1.5 ln(m). Total
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Catastrophe theory
variables may change slowly due to dynamics of slow variables. The theory of catastrophes was applied to the spruce budworm ( Choristoneura fumiferana ) (Casti 1982, Ecol. Modell., 14: 293-300). We will use the model which was considered in the previous section and modify it by adding a
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Predation and parasitism
Lecture 10. Predation and parasitism Course: Quantitative Population Ecology Dept. of Entomology, Virginia Tech, Blacksburg, VA © Alexei ... 10.5. Host-Parasitoid Models 10.6. Host-Pathogen Model (Anderson & May) 10.7. Questions and Assignments Alexei Sharov 1/12/96
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Population system
the life-system methodology was published by Sharov ( 1991 ). Major components of a population system Population itself. Organisms in the ... population change Disadvantage : It is useful for one-step instant effects but becomes confusing if the effect is simultaneously a factor that causes
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Quantitative Measures of Stability
population density ( initially these measures were called as coefficients of buffering and homeostasis, see Sharov [1985, 1986] ). Later they were re ... population density in the logistic model equals to carrying capacity, K. If the factor v affects K, then . If the factor v affects population growth
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Model of Leslie
Lecture 7. Model of Leslie Course: Quantitative Population Ecology Dept. of Entomology, Virginia Tech, Blacksburg, VA © Alexei Sharov The ... which describes development, mortality, and reproduction of organisms. The model is formulated using linear algebra . This model is mostly used
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