Class Notes (835,384)
Canada (509,147)
Biology (1,909)
BIOL 3020 (30)

Conservation Biology

4 Pages
Unlock Document

BIOL 3020
Scott Brandon

 many species depend on particular patterns of disturbances on the landscape such as fires and windstorms  conservation biologists work to assess whether reestablishment of historic disturbance patterns can help preserve biodiversity  many plant species require periodic fires for successful establishment and survival but however controlled burning is a common forest management tool ■ scars in the annual growth rings of trees preserve evidence of past fires that didn't kill them ■ researchers can determine when fires occurred, how severe they were and when fire patterns changed  annual growth rings showed that low-intensity fires were common near L.A until 1900  after that cattle and sheep grazing and fire suppression reduced the frequency of low-intensity fires  without these fires, dead branches and needles accumulate in forests  the belief that human know how to create functioning ecosystems has resulted in policies that make it easy to get permits for developments that destroy habitats  regulators believe that alternate wetlands can be created and so allow existing wetlands to be destructed ■ in southern California, 90% of coastal wetlands have been destroyed and wetland restoration is a high priority ■ since the species have been lost, it is not easy to reintroduce the species ■ previous attempts to create wetlands have failed and so established a large field experiment to discover why  found that experimental plots planted with species-rich mixtures developed a complex vegetation structure  species-rich plots accumulated nitrogen faster  many people would like to consume only natural products that have been harvested in ways that protect biodiversity and ecosystem productivity  Forest Stewardship Council (FSC) – established criteria that a forest products company must meet for its products to be certified ■ had most impact on forest management in temperate zones but certification of tropical zones is growing rapidly ■ Marine Stewardship Council was also formed to serve same purpose for marine products  Convention on International Trade in Endangered Species (CITES) – legal mechanism prohibiting the exploitation of endangered species in an international agreement ■ review status of species on its protected species lists, determine which species no longer need protection and add new species ■ prohibits international trade of whale meat, rhino horn and species of parrots and orchids ■ ban on trade of elephant ivory but in some countries government officials kill them in order to maintain population and sell ivory to raise money for conservation efforts ■ in 2002, 6.5tons of illegal ivory were seized in Singapore  some species are endangered by invasive exotic species, controlling these invasives is an important component of conservation biology  best way to reduce damage caused by invasive species is to prevent their introduction ■ transoceanic transport of invasive species in ballast water could be solved by deoxygenating ballast water before it is pumped out ■ invasive potential of a plant should be assessed prior to the introduction and marketing
More Less

Related notes for BIOL 3020

Log In


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.