PPT-Ecology 8310 Population (and Community) Ecology

Context Context What accounts for the distributional limit d ispersal perhaps with Allee effects b iotic and abiotic factors If environmental factors then λ N0 gt 1 within distribution. Image from Wikimedia Commons. Global human population. United Nations . projections (2004) . (. red. , . orange. , . green. ). . U. S. Census Bureau modern (. blue. ) . & historical . (. black. ) . Gerry Quinn. Deakin University. Data sets in community ecology. Multivariate abundance data. Sampling or experimental units. p. lots, cores, panels, quadrats ……. u. sually in hierarchical spatial or temporal structure. BIOL 7083. Community Ecology. Robert H. MacArthur:. Life, Work, and Legacy. Biographical Sketch. Robert H. MacArthur. April 2, 1930 – November 1, 1972. Personal Background. Born in Toronto, Ontario. Population Characteristics. Density. - # of individuals per unit of . area. Determined by…. counts . sample size estimate . indirect indicators . mark-recapture. Dispersion. Patch selection (e.g., Marginal Value Theorem). Prey selection (optimal diet theory). Moving beyond feeding (energy intake): predation risk. . (u/g). Patch selection. :. Consider a forager moving among many patches during a foraging bout (rodent among seed caches, pollinator among flowers, etc.). Beyond two trophic levels. HSS 1960. Oksanen. et al. 1981. Control, Limitation, Regulation. Bottom-up vs. Top-down. Trophic cascades. Beyond two trophic levels…. Why is the world green?. Observation: Plants are abundant; thus…. Patch selection (e.g., Marginal Value Theorem). Prey selection (optimal diet theory). Moving beyond feeding (energy intake): predation risk. . (u/g). Patch selection. :. Consider a forager moving among many patches during a foraging bout (rodent among seed caches, pollinator among flowers, etc.). Predator-prey theory. Basics (. Lotka-Volterra. ). Functional responses and risk. Effect on phase-planes. Dynamics. Paradox of enrichment. Predator interference and ratio dependence. How do predators respond to prey?. Developers have . approved a project that . will permanently reduce . the primary producers’ . biomass by 50% and remove all rabbits and deer. Which of the following is the most likely result at the completion of the project?. HW #1. Age-structured populations. Stage-structure populations . Life cycle diagrams. Projection matrices. Context: Sea . Turtle . Conservation. (But first … background). Population. Structure. :. Seguing into from populations to communities. Species interactions. Lotka-Volterra. equations. Competition. Adding in resources. Species interactions:. Competition (- , -). Predation (+ , -). (. Herbivory. 41:. Ch. 42:. Ch. 44:. Ecology. Ecology. : study of interactions between organisms and their environments – science of relationships, studied by ecologists. Abiotic . Factors:. non-living parts of an organism’s environment. Introduction to linking demography, population growth and extinction due to climate warming. What is Population Ecology? . Goal is to understand . factors. and . processes. that govern . abundance. SW: discuss with their groups how estimating a population could be used in a real world situation.. Population Ecology. Measuring a population. Growth Curves. Biotic Potential vs. Environmental. Resistance.