Skip to content

Choose a Chapter below or view the Sitemap

Unit 1:
Ch. 1
Ch. 2
Ch. 3
Interlude A
Unit 2:
Ch. 4
Ch. 5
Ch. 6
Ch. 7
Ch. 8
Ch. 9
Interlude B
Unit 3:
Ch. 10
Ch. 11
Ch. 12
Ch. 13
Ch. 14
Ch. 15
Interlude C
Unit 4:
Ch. 16
Ch. 17
Ch. 18
Ch. 19
Interlude D
Unit 5:
Ch. 20
Ch. 21
Ch. 22
Ch. 23
Ch. 24
Ch. 25
Ch. 26
Ch. 27
Ch. 28
Ch. 29
Ch. 30
Interlude E
Unit 6:
Ch. 31
Ch. 32
Interlude F
Unit 7:
Ch. 33
Ch. 34
Ch. 35
Ch. 36
Ch. 37
Ch. 38
Interlude G

Positive Interaction Can Increase Biodiversity

Although positive interactions are now known to be so common that many ecologists dismiss them as obvious, surprisingly little is known about their communitywide consequences, particularly how they affect species diversity.

» Read the full article

Active Reading Questions

  1. fiogf49gjkf0d
    Which of the following are examples of positive species interactions?
    a) pollinator mutualisms
    b) seed dispersal mutualisms
    c) behavior mutualisms
    d) all of the above
  2. fiogf49gjkf0d
    In a community, if two species interact and each has a negative effect on the other, we say the species are in ____________.
    a) exclusion
    b) exploitation
    c) competition
    d) character displacement
  3. fiogf49gjkf0d
    Compare and contrast mutualism and competition.
First Name:
Last Name:
Your Email Address:
Your Professor's Email Address:

Chapter Menu

Other Resources

Norton Gradebook

Instructors now have an easy way to collect students’ online quizzes with the Norton Gradebook without flooding their inboxes with e-mails.

Students can track their online quiz scores by setting up their own Student Gradebook.