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Your search keyword '"Schinazi, Rinaldo B."' showing total 3 results
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3 results on '"Schinazi, Rinaldo B."'

1. Can a rudderless species survive?

Author

Schinazi, Rinaldo B.

Subjects
Mathematics - Probability, Quantitative Biology - Populations and Evolution
Abstract

Some species of salmon and sea turtle are famously good at finding their birth place to reproduce after having travelled vast expanses of ocean. In contrast, imagine now a species (maybe ancestral to the salmon or turtle) which has to find its birth place to reproduce but has no navigation skills and relies on chance alone. Would such an imaginary species survive? According to our (very simple) model it would survive if and only if the probability that a given individual find its birth place is strictly larger than 1/2.

Published
2024

3. Collective Evolution Under Catastrophes.

Author

Schinazi, Rinaldo B.

Subjects
*RANDOM numbers, *DISASTERS, *ECOLOGICAL niche
Abstract

We introduce the following discrete time model. Each site of N represents an ecological niche and is assigned a fitness in (0 , 1) . All the sites are updated simultaneously at every discrete time. At any given time the environment may be normal with probability p or a catastrophe may occur with probability 1 − p . If the environment is normal the fitness of each site is replaced by the maximum of its current fitness and a random number. If there is a catastrophe the fitness of each site is replaced by a random number. We compute the joint fitness distribution of any finite number of sites at any fixed time. We also show convergence of this system to a stationary distribution. This too is computed explicitly. [ABSTRACT FROM AUTHOR]

Published
2024
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