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Published byGabriella Blair
Modified about 1 year ago
Many decades, huge area – spatially and temporally extensive cycling
More direct data on population density (not simply the harvest data)
The data align well with Lotka-Volterra Predator-Prey Model predictions
Year Abundance (Biomass) But might in reality be more complicated than LV model…
Experiment in decline phase of cycle with food supplementation and control.
Effects of predator exclusion and food Supplementation on ADULT SURVIVAL
Effects of food supplementation and predator exclusion on REPRODUCTION
The data confirm that this is largely a single predator – single prey cycle (with minor complications) ~2 hare kills per 3 days at peak of cycle
Generalist predator Prey switching in decline phase of prey Decouple the dynamics of predator and prey – breaks down LV cycles
Predation – what is it? One animal kills another for food ( + - interaction ) One animal kills another for food ( + - interaction ) Parasitism / Parasitoidism.
© Boardworks Ltd of 6. © Boardworks Ltd of 6 Predators and prey A predator is an animal that hunts and kills other animals for food. The animal.
P. 102, Analyzing Data #1, 2, 3. 1.Suppose a bacterial infection kills off most of the prey at point B on the graph. How would this affect the predator.
Predator-Prey Models Pedro Ribeiro de Andrade Gilberto Câmara.
Predator/Prey. Two big themes: 1.Predators can limit prey populations. This keeps populations below K.
Wildlife Biology Population Characteristics. Wildlife populations are dynamic – Populations increase and decrease in numbers due to a variety of factors.
STAGES OF POPULATION GROWTH. Population Growth can be… Exponential ORLimited (J curve)(S curve)
Intra-specific Interactions II What are the implications of density dependence in real populations? Do natural populations show fluctuations that could.
Living organisms exist within webs of interactions with other living creatures, the most important of which involve eating or being eaten (trophic interactions).
Grazing and Top Down vs. Bottom Up Regulation. Grazers Generally herbivores Remove tissue from a large number of ‘prey’ individuals Are rarely lethal.
OUR Ecological Footprint Chapter 15: Dynamics of predator-prey interactions.
Two Species System n y ’ = rn y - an y n d –r = independent prey population increase rate –a = effect of predator on prey population n d ’ = bn y n d -
Predicting predator-prey populations. Desired results.
Predation (Chapter 18) 1.Predator-prey cycles 2.Models of predation 3.Functional vs. numeric responses 4.Stability in predator-prey models.
Ecology: Lectures 14 & 15 Predation, Parts 1 & 2.
Predation – one species feeds on another enhances fitness of predator but reduces fitness of prey ( +/– interaction)
Population Interactions Competition for Resources: –Exploitative competition: Both organisms competing for the same resource(s). –Interference competition.
Searching for a good stocking policy for Lake Michigan salmonines Michael L. Jones and Iyob Tsehaye Quantitative Fisheries Center, Fisheries and Wildlife.
Predator-Prey Cycles Control of Population Size. Charles Elton (on the right) Studied living organisms in relation to their natural environment, or ECOLOGY.
OUR Ecological Footprint Recycle; pay tax for it. 2.
Exploitative Interactions Predation / Herbivory / Parasitism.
Ecological footprints of some nations already exceed available ecological capacity.
PREDATION One of the least well developed areas of ecological theory Management problems occur with a lack of information –Biological data on predators.
Ch 4: Population Biology 4.1 Population Dynamics.
Ecology 8310 Population (and Community) Ecology Beyond two trophic levels HSS 1960 Oksanen et al Control, Limitation, Regulation Bottom-up vs. Top-down.
54 Fluctuations in Population Densities Exponential growth can be represented mathematically: N/ t = (b – d)N N = the change in number of individuals.
I. Regulation of population size of the prey A. Reduction of population size B. Predator-prey cycles C. Maintaining predators and prey II. Responses of.
Please pass back the new objective sheet. Please get out your signed permission slip and $15 for pick up. Take your “Tradeoffs- Sage Grouse and energy”
Interactions among Living Things. Populations There is a limit to the number of organisms (population) that an ecosystem can support based on different.
Bell Ringer Label each graph as either LOGISTIC GROWTH or EXPONENTIAL GROWTH. Label each graph as either LOGISTIC GROWTH or EXPONENTIAL GROWTH. A B.
POPULATION CYCLES. I. WHAT IS A CYCLE? A. The Concept of Cycles u multiannual fluctuations that occur with some regularity (periodicity)
Rabbits, Foxes and Mathematical Modeling Peter Pang University Scholars Programme and Department of Mathematics, NUS SMS Workshop July 24, 2004.
MATH3104: Anthony J. Richardson.
Theoretical Impacts of Habitat Fragmentation and Generalist Predation on Predator-Prey Cycles Kelsey Vitense “Current Challenges for Mathematical Modelling.
Chapter 40 Population Dynamics. You Must Know How density-dependent and density- independent factors can control population growth. The differences between.
Predator-Prey Interactions We wish to know: how predators affect prey populations, and vice-versa what stabilizes predator-prey interactions and prevents.
Lynx & Hare Learning Objectives 1.Students will be able to calculate population density. 2.Students will be able to graph the size of a population over.
PREDATION In predation, one individual, the predator, captures, kills, and consumes another individual, the prey. Adrienne Farmers.
Chapter 5 Section 2 Limits to Growth Objectives: -Identify factors that limit population growth -Differentiate between density-dependent and density-independent.
Limiting Factors Ecosystems SC.912.L.17.5 ESSENTIAL QUESTION: How do abiotic (physical) limiting factors affect growth and survival in an ecosystem ?
Chapter 15 Predation. I. Terminology Predation = one organism is food for another Carnivory = feeding on animal tissue Parasitoidism = killing of host.
Big Idea u The organism’s niche determines its biotic interaction with other organisms including feeding relationships, competition, and symbiosis.
Chapter 6 Population and Community Ecology. Nature exists at several levels of complexity.
AN ECOSYSTEM IS A COMMUNITY (all organisms) PLUS ABIOTIC FACTORS POPULATIONS AND RESOURCES FLUCTUATE AT A PREDICTABLE RATE OVER TIME.
POPULATION CYCLES. I. WHAT IS A CYCLE? A. The Concept of Cycles.
Fisheries in the Seas Fish life cycles: Egg/sperm pelagic larvaejuvenile (first non-feeding – critical period – then feeding) (first non-feeding – critical.
Natural selection predator–prey interactions. Ecological interactions between organisms 1)Competition(-/-) two organisms using the same resources -Interspecific.
Lecture 6 BSC 417. More models Logistic growth Overshoot and collapse.
BIOTIC FACTORS AFFECTING POPULATIONS. I. THE CONCEPT OF DENSITY DEPENDENCE I. THE CONCEPT OF DENSITY DEPENDENCE u Vital rates change as density changes.
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