VITALI - didattica
Top Corsi Appelli Tesi Giuliano Vitali: didattica Informazioni su corsi, esami e tesi disponibili Corsi 2018-2019 Insegnamento Corso codice(CFU) CdL sede anno - ciclo(sem) AGROMETEOROLOGIA ed ECOLOGIA AGRARIA (VOTP) (c.i. Agronomia, Ecologia Agraria e Tappeti Erbosi - cod.78287)
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Stratified Dispersal
dispersal includes: establishment of new colonies far from the moving population front; growth of individual colonies ; colony coalescence that ... colonies coalesced A good example of a population with stratified dispersal is gypsy moth . Gypsy moth egg masses can be transported hundred miles
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Simple degree-day model
limit ; this is the temperature at which development rate reaches zero. ET = t - t min is effective temperature . S are degree-days ; this is ... estimated from the regression line of development rate versus temperature. We assume that regression equation is: v = a + bt where a is intercept,
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Predator-Prey Model with Functional and Numerical Responses
presented below. This model exhibits more various dynamic regimes than the Lotka-Volterra model. r H = 0.2 K = 500 a = 0.001 T h = 0.5 r P = 0.1 k = 0.2 No oscillations r H = 0.2 K = 500 a = 0.1 T h = 0.5 r P = 0.1 k = 0.2 Damping oscillations converging to a stable equilibrium r H = 0
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Random distribution
25 23 2 21 0.21 27 3 25 0.25 20 4 9 0.09 12 5 7 0.07 5 6 2 0.02 2 7 0 0.00 1 Total N=100 1.00 100 Mean number of fish captured by 1 fisher, M = 2.30, and standard deviation, SD = 1.41. Poisson distribution is described by equation: where m is the mean and i != 1�2�3� ... � i , 0!=1;
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A model of an outbreak
A model of an Outbreak The eastern spruce budworm ( Choristoneura fumiferana ) is a forest pest insect. It defoliates spruce stands in ... assuming that the search rate of predators is proportional to prey density (a = qN). Then, alpha = qP, and beta = qT h , where P is the density of
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value-chain
Top Motivation Technology Products Problems Plot3D for value chain Plot3d ver. 2.0 - Mar 2021 developed by Giuliano Vitali Motivation to the study Obtain a simultaneous 3D visualization of Price - Production - Temperature data of 2 or more crops with the possibility to change
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Lotka-Volterra Model
by Lotka (1925) and Volterra (1926): It has two variables (P, H) and several parameters: H = density of prey P = density of predators r = intrinsic rate of prey population increase a = predation rate coefficient b = reproduction rate of predators per 1 prey eaten m = predator mortality
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Limit Cycles and Chaos
9.5. Limit Cycles and Chaos We found that Ricker's model is stable if 0 < r < 2. The question is what happens to model population when ... dynamics using Ricker's model with different values of r: r = 0.5 Monotonous increase in numbers. K = 200 r = 1.9 Damping oscillations. K = 200 r =
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Questions and assignments 6
Questions and assignments to Lecture 6 1. Build a life table for an aphid population (aphids reproduce parthenogenetically). Estimate l x , d x , m x , R o , T , and r . (See a picture of aphids !) Age, days (x) Number of survivals Mean number of offsprings per parent 0 1000 0 1
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How Many Samples to Take?
Two-step sampling The number of samples, N , required to achieve specific accuracy level can be estimated from equations for standard error (S.E.) and accuracy, A : where M is sample mean and S.D. is standard deviation. Here the third equation is derived from the first two equations.
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Age-dependent life-tables
life-table, the effect of these factors is averaged. Only age is considered as a factor that determines mortality and reproduction. Example . Consider a sheep population which is censused once a year immediately after breeding season: Age, years (x) Probability of surviving to age x ( l x )
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Petri Nets
Petri Nets A more universal factor-process model was developed by Petri (1962). He introduced a class of nets which later were named " Petri nets ". These nets have two types of components: positions and transitions (positions = factors, transitions = processes). Example of a
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GV-en models
Top Content Contacts Lectures This lessons are introductory seminars on sadvanced topics of physics applied to natural, environmental and ... international master's and PhD students. Mathematical models in environmental, crop and food science Campus Cesena P.za Goidanich - Computer Lab 2019
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Stage-dependent life-tables
and other terrestrial invertebrates. Example. Gypsy moth ( Lymantria dispar L.) life table in New England (modified from Campbell 1981) Stage ... 0 5.6 0.350 0.650 0.4308 Adult females 10.4 TOTAL 439.6 97.69 0.0231 3.7674 Specific features of stage-dependent life tables:
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