New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Community Dynamics

by: Jesse McDonald

Community Dynamics Biology 286

Marketplace > Purdue University > Biology > Biology 286 > Community Dynamics
Jesse McDonald

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

These notes correspond to lecture 22
Introduction to Ecology and Evolution
Dr. Josh Springer
Class Notes
Biology, Ecology, evolution, communities, species
25 ?




Popular in Introduction to Ecology and Evolution

Popular in Biology

This 2 page Class Notes was uploaded by Jesse McDonald on Thursday April 7, 2016. The Class Notes belongs to Biology 286 at Purdue University taught by Dr. Josh Springer in Spring 2016. Since its upload, it has received 14 views. For similar materials see Introduction to Ecology and Evolution in Biology at Purdue University.


Reviews for Community Dynamics


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 04/07/16
iClicker Question:  Species richness takes into account which of the following?  A. Presence of individuals of a species  B. Abundance of individuals of a species  C. Biomass of a total species in an area  D. How much better one species is compared to another    Community Dynamics    ● Many processes interact to influence community structure  ● How does the structure of a community change through time?    Community structure changes through time:  ● Succession​ is the temporal change in community structure at a given location  ● Example:  ○ Abandoned cropland can go through succession:  ■ First, grasses and weedy herbaceous plants colonize   ■ Then shrubs invade  ■ Overtime, these shrubs are replaced by pine trees, eventually forming a  closed­canopy forest  ■ Eventually, deciduous hardwoods dominate the landscape   ● Succession can be either manmade or natural.  ● A sere is the sequence of communities seen in succession, from grass to shrub to  forest.   ● Each of the changes isseral stage, a point on the continuum of vegetation through  time.  ● These stages often can be recognized as distinct communities, with characteristic  structure and species composition.  ○ Stages may last years or decades  ○ Some stages may be missed or abbreviated/altered  ○ IT MAY BE DIFFICULT TO DELINEATE STAGES  ● Early successional speciesare the initial colonis​ioneer specie​Often have:  ○ High growth rates  ○ Smaller sizes  ○ High degree of dispersal and colonization  ○ High rates per capita population growth  ● Late successional species​arrive later. Often have:  ○ Longer lifespans  ○ Larger sizes  ○ Lower rates of dispersal and colonization   ○ Lower rates per capita population growth  ● The patterns of species replacement through time are not random.  ○ There is much structure throughout!  ■ Can be reset.     Primary succession occurs on newly exposed substrates:  ● Ex: dunes can shift, covering existing vegetation or even buildings.  ○ Plant coverage stabilizes the dunes.  ● Subsequent study quantified the successional patterns by examining a chronosequence  of dunes determined by radiocarbon dating  ○ A chronosequence  ​(chronosere) is a series of sites within an area that are at  different successional stages (seral stages)  ■ This allows space to substitute for time  ● Pioneering species ­ grasses, mainly beach grass, stabilize the dune with extensive  rhizomes Then mat­forming shrubs colonize.  ● Subsequently, trees invade: first pine, then oak.  ○ Sand has low moisture (mesophytic) rarely succeed the pines and oaks except in  depressions or other areas where moisture accumulates.     Species diversity changes during succession:  ● Colonization increases species richness.  ● Species replacement results from the inability of a species to tolerate changing  environmental conditions or competition.  ○ Over time, species replacement decreases richness.  ● The peak in diversity during mid­successional stages is a transition period, after later  successional species have arrived but before early successional species are replaced.   ● Intermediate disturbance hypothesis the highest species diversity is seen at  intermediate frequencies of disturbance.  ● Ex: When the climate began to warm, the ice sheet retreated north.  ○ By 8,000 yearsB.C.​ce was restricted to areas in northern Canada.  ○ Plant species  began to invade formerly glacier­covered areas.  ■ Pollen from tree species settled into lake sediments  ■ Cores from these species (dated by radiocarbon dating) can be used to  map the northward advances of different genera of trees over the past  18,000 years.    


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

Allison Fischer University of Alabama

"I signed up to be an Elite Notetaker with 2 of my sorority sisters this semester. We just posted our notes weekly and were each making over $600 per month. I LOVE StudySoup!"

Bentley McCaw University of Florida

"I was shooting for a perfect 4.0 GPA this semester. Having StudySoup as a study aid was critical to helping me achieve my goal...and I nailed it!"


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.