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Dynamical Systems in Population Biology

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Carrying Capacity

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The maximum population size that the environment can sustain indefinitely. Application in Ecology: Determines the ceiling for species population growth and informs conservation efforts.

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Population Viability Analysis (PVA)

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A species-specific method of risk assessment used to determine the probability that a population will go extinct within a given number of years. Application in Ecology: Helps in formulating conservation strategies and understanding the effects of environmental change on species survival.

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Resilience

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The measure of how much disturbance an ecological system can withstand without changing self-organized processes and structures. Application in Ecology: Guides the management of ecosystems to prevent regime shifts.

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Metapopulation Dynamics

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A group of spatially separated populations connected by dispersal of individuals or gametes. Application in Ecology: Helps in understanding and modeling the effects of habitat fragmentation on species survival.

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Bifurcation

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A mathematical change in the number or stability of equilibrium points as a parameter is varied. Application in Ecology: It helps in identifying critical points where small changes can lead to drastic shifts in population dynamics.

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Logistic Growth Model

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A model that describes how a population grows rapidly at first then stabilizes as the population reaches the carrying capacity of the environment. Application in Ecology: Used to predict population sizes and growth rates within an ecosystem where resources are limited.

P(t)=K1+(KP0P0)ert P(t) = \frac{K}{1 + \left(\frac{K - P_0}{P_0}\right)e^{-rt}}

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Chaos Theory

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A branch of mathematics focusing on the behavior of dynamical systems that are highly sensitive to initial conditions. Application in Ecology: Explains complex and seemingly random fluctuations in ecological systems.

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Ricker Model

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A discrete population model that shows how populations may fluctuate widely due to strong density-dependent regulation. Application in Ecology: Used for managing harvested populations like fish or forest species.

Pt+1=Pter(1PtK) P_{t+1} = P_t e^{r(1 - \frac{P_t}{K})}

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Catastrophe Theory

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A theory of how small changes in certain parameters can lead to sudden and dramatic changes in the system's behavior. Application in Ecology: Used to analyze cases where ecosystems experience abrupt changes due to gradual environmental stress.

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Stability

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The ability of an ecological system to return to its original state after being disturbed. Application in Ecology: Central to the study of ecosystem dynamics and the impact of external stressors.

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Predator-Prey Model

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The Lotka-Volterra equations represent the dynamics between predators and their prey, showing oscillations in the populations of both. Application in Ecology: Helps in understanding the interaction between predator and prey populations in an ecosystem.

dPreydt=Prey(birthRatepredationRatePredator)dPredatordt=Predator(successRatePreydeathRate)\begin{align*} \frac{dPrey}{dt} &= Prey \cdot (birthRate - predationRate \cdot Predator) \\ \frac{dPredator}{dt} &= Predator \cdot (successRate \cdot Prey - deathRate) \end{align*}

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Allee Effect

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A phenomenon in biology where the population growth is positively correlated with population size. Application in Ecology: Important when considering small populations that may have difficulty surviving and reproducing.

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