BIOB50Winter2012 Lecture 23.docx -includes pictures and relevant text notes!!

12 Pages
Unlock Document

University of Toronto Scarborough
Biological Sciences
Marc Cadotte

BIOB50Winter2012 Lecture 23 Conservation Biology Chapter 22 Case Study Can Bombs and Birds Coexist o The forests of Fort Bragg have been used for military training and bombarded for 90 yearso The now uncommon ecosystem survives in large part as a result of military presence o Pine savanmna depends on fire for its persistencefires from explosives actually benefit the evosystem o The designation of large blocks of forestland for military use has kept them from being converted into farmland forest plantation and residential uses o Longleaf pine savanna ecosystem has been reduced to 3 o Rapid growth of human population clearing of land and fire suppression have contributed to the ecosystem loss o With the decline of longleaf pine ecosystem several plant insect and vertebrate species that depend on it have also declined o One of these species is the redcockaded woodpecker6100 breeding pairs left and their helpers they are cooperative breeders where 2 to 4 males born to the breeding pair in previous years help their parents raise the young this year require longleaf pine for nesting cavitieso Figure 222 Decline of the Longleaf Pine Ecosystemlongleaf pine savanna consists of open forest with grass understoryoo Periodic fires helped maintain the longleaf pine savannao The woodpeckers abandon their nesting cavities apparently due to low food resources o In the past they would move to the parts of the forest that have been recently burnedas the areas of mature pine savanna decline there are fewer places for the birds to go too Loss of habitat has reduced the woodpecker populations making them vulnerable to small population problemsCase Study RevisitedCan Birds and Bombs Coexist o Scientists constructed artificial nest cavities placed them in clusters and observed woodpecker behaviour 1o Each bird in a cooperatice breeding group must have its own cavity for roostingthat is why they are found in clusters o Cavity clusters are abandoned after several yeasrs of use because of mortality of tree or cavity entrance enlargement due to the entry of other specieso The cavity clusters constructed were colonized mostly by young dispersing birds and helper birds from vicinity o Population increased from 238 to 368 breeding groups in 2006o The story of the redcockaded woodpecker reflects that of thousands of other imperiled species around the worldo Legal protection and extraordinary human effort have resulted in stabilization and slow recovery o Do we have responsibility to protect biodiversity How can we allocate limited resources for conservation Introductiono2
More Less

Related notes for BIOB50H3

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.