Unifying Modeling Approaches for Better Understanding and Characterizing the Effects of Sound on Marine Mammals
Abstract
During the last 30 years, two major strands of mathematical modeling that can be used to understand the effects of sound on marine mammals developed. The first is Dynamic Energy Budget Theory (DEB)/Physiologically Structured Population Models (PSPM). The second strand is State Dependent Life History Theory (SDLHT) implemented by Stochastic Dynamic Programming. Each has strengths and weaknesses. DEB/PSPM is naturally suited to treat both individual life histories and population dynamics when there are feedbacks between the population and the resource base in the environment. However, it requires that parameters of the life history such as the allocation of resources to somatic tissue vs. gonadal tissue are specified exogenously to the model. SDLHT is naturally suited to predict the allocation as a function of physiological and environmental states and age of the animals, but is less effective when there are feedbacks between the environment and individuals. The overall objective of this proposal is to meld the two approaches. That is, our goal is to link the approach of SDLHT of developing behavioral and life history rules within the dynamical equations themselves with the approach of DEB/PSP that allows a framework for linking changes in the resources in the environment to the dynamics of states that much can be gained by doing so. In essence, we will construct, for the first time, a state dependent life history model in which the underlying physiology follows a DEB framework. To do so will require overcoming a variety of technical challenges, but will provide a powerful tool for predicting the effects of disturbance on marine mammals.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 15, 2019
- Source ID
- N000141912494
Entities
People
- Marc Mangel
Organizations
- Office of Naval Research
- United States Navy
- University of California, Santa Cruz