Class Notes (885,074)
CA (529,720)
U of A (13,816)
REN R (273)
REN R440 (5)
Lecture 1

REN R440 Lecture 1: Lecture 1

3 Pages

Renewable Resources
Course Code
REN R440
Nadir Erbilgin

This preview shows page 1. Sign up to view the full 3 pages of the document.

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Ren R 440: Lecture 1 Disturbance: a discrete event in time and space that alters the structure of populations, communities, ecosystems and/or changes resources, substrate availability or the physical environment -Disturbance can be: an event or source that causes disturbances the physical characteristics of that event (frequency, intensity, extent) the impact or severity of that event the short or long term consequences of that event through ecosystem response or succession Why study disturbances? -curiosity about the environment and dramatic disruptions of it -to understand the patterns of disturbances and of recovery -to conserve biodiversity from damage caused by disturbances -to better manipulate and restore damaged ecosystems and recover their services from a human use point of view these restored areas may be functional but they are no longer the same as they were in their natural states and so are referred to as anthromes rather than biomes, referring to the human design and the services humans have identified and restored in them Types of disturbance: -Natural: fires, floods, insect & disease epidemics, winds, volcanoes, landslides, ice storms, glaciers -Anthropogenic: agriculture, mine tailing, oil sands, pipelines, mine slurry, logging, urbanization, highways, road construction, powerlines, air pollution, toxic elements Disturbances may exist along a continuum of natural or anthropogenic influence, as human activities can worsen natural events, cause areas to become more susceptible to natural disturbances, or increase the frequency of natural disturbances (ie increased droughts/storms/insect outbreaks due to global warming) Characteristics of disturbances: Frequency: number of similar disturbance events at a given location per unit time, measured with return intervals, small scale events occur more frequently than large scale events (eg grassland fires vs forest fires or earthquakes vs volcanic eruptions) Intensity: describes the force of the disturbance (eg volcanic explosivity, earthquake magnitude, fire temperature, wind speed, depth of soil displacement from erosion, days without rain in a drought), can be affected by past disturbances and current conditions (eg fire affected by fuel loads, wind speed, temp, and humidity) Severity: amount of biomass lost or the degree of alteration of ecosystem structure or function, which can be related to intensity, ↑intensity ↑severity, measured with %mortality of species or kg of biomass lost, severe disturbances lead to primary succession (remove entire existing community), less severe disturbances lead to secondary succession (soil and seed banks remaining, or more) Magnitude: consists of intensity and severity, so the strength of the disturbance and the extent of the disturbance, it is possibl
More Less
Unlock Document
Subscribers Only

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
Subscribers Only
You're Reading a Preview

Unlock to view full version

Unlock Document
Subscribers Only

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.