Class Notes (836,219)
Canada (509,690)
Biology (2,156)
BIO205H5 (180)
Lecture

BIO205 Lecture 21 (Nov 19, 2012) - EDIT.docx

2 Pages
89 Views
Unlock Document

Department
Biology
Course
BIO205H5
Professor
Christoph Richter
Semester
Fall

Description
BIO205 Lecture 21 - Lecture 21: Threats to biodiversity - Conservation is concerned with biodiversity o Reduced amount of predatory fishes - Biodiversity changes over time o Diversity is a moving target o Early vascular and pteridophytes increased very early on and now has leveled off o Angiosperms are increasing - And sometimes diversity dropped big time o Plants and animals o By 60 million years ago, it dropped dramatically - McHumor Dinosaur Comic o Extinction of dinosaurs - What is biodiversity? What would we measure? o (discussion) - There are different types of biodiversity o Species diversity o Genetic diversity o Ecological diversity  How many variants of habitats o Phylogenetic diversity o Behavioural diversity  Not all species behave the same  Same species can behave differently in different environments - Are we currently experiencing the sixth extinction? o Globally, still about 30% pure species o In some areas like North America, the species diversity is going up because of conservation and protection of animals o In areas such as tropic South America, there’s a decrease of 44% o But overall, there’s still a continual decline of diversity globally o Total living planet index = -28% - There are a range of causes for the decline of biodiversity o Invasive species? o Pollution? o Habitation fragmentation? o Habitat reduction is the major reason why species are going down o Marine animals is being overexploited the most o Factors: habitat loss, introduced species, overexploitation, pollution, native species interactions, natural causes o IMAGE REMOVED - For
More Less

Related notes for BIO205H5

Log In


OR

Join OneClass

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

Sign up

Join to view


OR

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.


Submit