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Sebastian Schreiber
@sebastianschreiber.bsky.social
Population biologist and mathematician wrestling with the complexities of nature armed with the theories of stochastic processes and dynamical systems. Dynamics of Ecological and Evolutionary Processes Lab schreiber.faculty.ucdavis.edu
351 followers190 following65 posts
Reposted by Sebastian Schreiber
SSsmbmathbiology.bsky.social

The Best Publication Prize was awarded to Veronica Ciocanel, Lee Ding, Lucas Mastromatteo, Sarah Reichheld, Sarah Cabral, Kimberly Mowry and Björn Sandstede for their paper "Parameter Identifiability in PDE Models of Fluorescence Recovery After Photobleaching". link.springer.com/article/10.1...

Parameter Identifiability in PDE Models of Fluorescence Recovery After Photobleaching - Bulletin of Mathematical Biology
Parameter Identifiability in PDE Models of Fluorescence Recovery After Photobleaching - Bulletin of Mathematical Biology

Identifying unique parameters for mathematical models describing biological data can be challenging and often impossible. Parameter identifiability for partial differential equations models in cell bi...

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Reposted by Sebastian Schreiber
SSsmbmathbiology.bsky.social

The editorial also announced the most recent winners of the Lee A. Segel Prizes for the Best Paper and Best Student Paper in #BulletinMathBiosmb.org/Lee-A.Segel-...

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We applied this formulas to some examples to illustrate their implications. Notably, for spatially structured models with symmetric dispersal matrices , the approximations suggest that long-term growth rates are always maximized in the slow limit. Check out the preprint for other implications. 6/6

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In the fast limit (w XXL), things are more delicate and the first-order approximations for random and periodic are not the same. E.g., in the case of 2 environments, first order correction term is zero (!!) for periodic but generally non-zero for random. Hence, we derived a 2nd order approx. 5/n

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We find analytical first-order and second-order formulas for r(w) in the slow (w XXS) and fast (w XXL) limits. In the slow limit, the first order approximations for random and periodic agree when comparisons make sense e.g. two environmental states shown below 4/n

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We are interested in how the tempo (w) and mode (periodic versus random) influence long-term population growth as characterized by the dominant Lyapunov exponent r(w) of the system 3/n

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The models are x'(t)=A(s(wt))x(t) where s is a piecewise constant periodic or random function taking on a finite # of values (environmental states) and w (omega) is the frequency of the fluctuations, and A(s) are Metlzer matrices i.e. matrices with non-negative off-diagonals 2/n

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Thanks! :D

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Here you go .. a bit messy as I drew it quickly this morning

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Sebastian Schreiber
@sebastianschreiber.bsky.social
Population biologist and mathematician wrestling with the complexities of nature armed with the theories of stochastic processes and dynamical systems. Dynamics of Ecological and Evolutionary Processes Lab schreiber.faculty.ucdavis.edu
351 followers190 following65 posts