Class Notes (809,118)
Canada (493,535)
Biology (1,868)
BIOL 2060 (113)
xx (10)
Lecture 11

Ecology Lecture 11.doc

5 Pages
Unlock Document

University of Guelph
BIOL 2060

Ecology Lecture 11 What happens with migration (i.e., open populations)? Recall: (Open) Population Growth Population growth rates (dN/dt) determined by: R = b – d + i – e Migration occurs via dispersal. Dispersal to an unoccupied habitat patch is referred to as colonization.  EX.  Circled population – good indication of immigration because when the subpopulation size gets to zero (goes extinct/extirpated), recruitment occurs via immigration (this subpopulation was rescued by another subpopulation) Metapopulation - A collection of spatially distinct subpopulations (or patches) of the same species that are connected to one another via dispersal. Also referred to as a “population of populations”. - Strictly, the whole system persists over time, even though individual populations sometimes go extinct. - Becoming more common with fragmentation – at one time very large populations, get chipped away & become a collection of smaller populations. Dispersal - The movement of an organism from its place of birth or activity to another location. It usually refers to the movement of individuals or propagules (larvae/seeds/spores) of fragments away from a group of others of the same species. - Dispersal facilitates the search of new resources (food, space, mates), reduces competition, & allows colonization of new areas to increase a species’ range. Dispersal Mechanisms - Endozooic: ingested by one organism and passed through the digestive system - Epizootic: attach to an organism & transfer with it  Biotic/Abiotic mechanisms with large dispersal or any mechanism with large dispersal: best for a metapopulation - Arrows indicate dispersal/movement, blobs are patches - (patch that says occupied refers to the one below it)  Whole concept of the metapolution. Criteria for Metapopulation Necessary conditions for metapopulation to be applicable to a system of local populations: 1) Suitable habitat occurs in discrete patches that may may be occupied by local breeding populations. 2) Even the largest populations have a substantial risk of extinction (may include: core  satellite) 3) Habitat patches must not be too isolated to prevent
More Less

Related notes for BIOL 2060

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.