Abstract
I describe how stochastic dynamic programming (SDP), a method for stochastic optimization that evolved from the work of Hamilton and Jacobi on variational problems, allows us to connect the physiological state of organisms, the environment in which they live, and how evolution by natural selection acts on trade-offs that all organisms face. I first derive the two canonical equations of SDP. These are valuable because although they apply to no system in particular, they share commonalities with many systems (as do frictionless springs). After that, I show how we used SDP in insect behavioral ecology. I describe the puzzles that needed to be solved, the SDP equations we used to solve the puzzles, and the experiments that we used to test the predictions of the models. I then briefly describe two other applications of SDP in biology: first, understanding the developmental pathways followed by steelhead trout in California and second skipped spawning by Norwegian cod. In both cases, modeling and empirical work were closely connected. I close with lessons learned and advice for the young mathematical biologists.
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Acknowledgments
My work on insect behavioral ecology was financially supported over the years by the NSF and the USDA and intellectually supported by the wonderful collaborations with Bernie Roitberg and Jay Rosenheim. The work on steelhead (which was supported by the Cal-Fed Science Program) was preceded by a decade of collaboration with Felicity Hungtingford, Neil Metcalfe, and John Thorpe on Atlantic salmon and supported by a NATO travel grant, California Sea Grant, and the US National Marine Fisheries Service. Preparation of this paper was partially supported by NSF Grant EF-0924195. I thank Suzanne Alonzo, Charles Fisher, Holly Kindsvater, Susan Mangel, Bernard Roitberg, Jay Rosenheim, and Katriona Shea for comments on a previous version of the manuscript, Simone Vincenzi for a careful and thoughtful review of the penultimate version, and two anonymous referees for their comments on the submission. To a very real extent, my career was shaped by Morton Brussels and Donald Ginsberg, who taught that course in electricity and magnetism in academic year 1969–1970 and by my first scientific mentor, William W. Hay, who guided me through my first paper in which models were used to illuminate a scientific question (Mangel 1971).
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Dedicated to my mentor Donald Ludwig on the occasion of his 80th birthday.
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Mangel, M. Stochastic Dynamic Programming Illuminates the Link Between Environment, Physiology, and Evolution. Bull Math Biol 77, 857–877 (2015). https://doi.org/10.1007/s11538-014-9973-3
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DOI: https://doi.org/10.1007/s11538-014-9973-3