MBI Videos

Videos by Workshop 3: Ecology and Control of Invasive Species, Including Insects

  • Predation, competition and infection in a noisy environment
    Horst Malchow
    Biological invasions including the spread of infectious diseases have strong ecological and economical impacts. The perception of their often harmful effects has been continuously growing both in sciences and in the public. Mathematical modelling is a suitable method to investigate the dynamics of invasions, both supplementary to and initiating eld studies as well as cont...
  • Sex-Biased Dispersal and the Speed of Two-Sex Invasions
    Mike Neubert
    Population models that combine demography and dispersal are important tools for forecasting the spatial spread of biological invasions. Current models describe the dynamics of only one sex (typically females). Such models cannot account for the sex-related biases in dispersal and mating behavior that are typical of many animal species. In this lecture, I will construct a t...
  • Integrodifference equations for invasive species - some recent developments
    Frithjof Lutscher
    Integrodifference equations provide a very natural general framework to model the spread of invasive species if the species in question has a clearly distinct growth and dispersal phase during its life cycle. Many insect species satisfy this description, in particular where climate imposes strong seasonality.

    Early applications of integrodifference equations...
  • Effects of endogenous vs exogenous sources of spatial heterogeneity on population stability and persistence
    Karen Abbott
    Invasive species can be heavily influenced by spatial heterogeneity in the landscape through which they are spreading. This heterogeneity may be endogenous (that is, patchiness in the distribution of the invader itself, or heterogeneity in other species due directly to interactions with the invader) or it may be exogenous (such as patchy resources or heterogenous climatic ...
  • Marine bioinvasion in the network of global shipping connections
    Bernd Blasius
    Transportation networks play a crucial role in human mobility, the exchange of goods, and the spread of invasive species. With 90% of world trade carried by sea, global shipping provides one of the most important modes of transportation. Shipping also constitutes the world largest transportation vector for marine bioinvasion, transferring accidentally numerous species arou...
  • Models and Data for Invasive Spread Across Lake Networks
    Mark Lewis
    In this talk I will outline a recent interdisciplinary effort to model and understand the spread of invasive copepods across lake networks in North America. This 5-year project, developed through the Canadian Aquatic Invasive Species Network (CAISN), tracked the invasion status of approximately 500 interconnected lakes in the Canadian shield. Here the invader, spiny waterf...
  • Spatiotemporal Dynamics Behind Invasions In Cyclic Populations
    Jonathan Sherratt
    In populations with cyclic dynamics, invasions typically generate either regular (periodic) spatiotemporal oscillations, spatiotemporal chaos, or a mixture of the two. I will present examples of these behaviours in numerical simulations of invasions. I will then describe how to determine which of the behaviours will occur, as a function of ecological parameters. The charac...
  • Patchy Invasion: Exotic Spread of Exotic Species or a Paradigm Shift?
    Sergei Petrovskii
    Biological invasion admittedly consists of a few distinctly different stages such as exotic species introduction, establishment and geographical spread. Each of the stages has its own specific mechanisms and implications, which require application of specific research approaches. In my talk, I focus on the challenges arising during the stage of the geographical spread. A w...
  • The effect of disease on invasions
    Frank Hilker
    Why do some exotic species thrive so successfully once they have been introduced to a new environment? One of the reasons most frequently called upon is the enemy release hypothesis, which explains the inordinate success of introduced species by the lack of pressure from co-evolved natural enemies. In this talk, I consider the situation that the new environment changes in ...
  • Invasion speeds and sensitivity analysis in variable environments
    Hal Caswell
    Invasion speeds can be calculated from matrix integrodifference equation models that incorporate stage-specific demography and dispersal. These models also permit the calculation of the sensitivity and elasticity of invasion speed to changes in demographic and dispersal parameters. Such calculations have been used to understand the factors determining invasion speed and to...
  • Group discussion: Applying wavespeed models to the real world
    Ingrid Parker
    No description available....
  • Dynamics and control of Spartina alterniflora and related issues
    Alan Hastings
    I will discuss models that include the kinds of spatial dynamics and control and life history appropriate for this plant. The ideas will focus on developing simple analytic models and using approaches that into account not only control but restoration and bio-economic aspects. Mathematical tools will include linear and quadratic programming in addition to optimization and ...
  • Optimal control of invasive models
    Suzanne Lenhart
    Optimal control will discussed as a tool to find intervention strategies in models for invasive species. Examples of optimal control of discrete time systems and of systems of ordinary differential equations will be given. Control characterizations and numerical results for models with different types of control intervention actions will be presented. Applications include ...
  • Confronting perfect models with imperfect data using data cloning
    Subhash Lele
    Modeling population dynamics is essential to study ecological populations whether for maintaining the existing populations (e.g. Population Viability Analysis) or for controlling spread of invasive species. Meta-population dynamics that takes into account of immigration and emigration also plays an important role in studying spread of invasive species. Systems of ordinary ...
  • Stochastic logistic model with environmental noise
    Brian Dennis
    The logistic model is the quintessential model of invasion. The fundamental idea of the logistic is "something replacing something else": vegetative cover replacing empty space, biomass replacing nutrient, infected individuals replacing uninfected ones, DVD households replacing VHS households. Biological mechanisms producing logistic growth are analogous to an au...

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