Exam 58: Conservation Biology

Which of the following whale species are recovering their population numbers as a result of whale harvesting regulations? I-right whales II-Pacific gray whales III-sperm whales IV-fin whales V-humpback whales

Edge effects are the result of which of the following?

A small island has stable populations of plants and animals,including one species of hawk but no other large predators.A ship docks at the island,and the sailors hunt and kill most of the hawks.What would you expect as an immediate consequence?

A floodplain is an area adjacent a stream or river that experiences flooding during periods of high discharge.These ecosystems can be very rich in both quantity and diversity of organisms and can contain up to 1,000 times more species than a river.Many floodplains have been compromised by the construction of levees,pollution,and the draining of wetlands and marshes.A restoration project that focuses its efforts on the removal of levees and the improvement of water quality,is a plan focused on

A major problem with hotspots is humans moving in and causing

Human caused introductions can occur by which of the following? Check all that apply.

Regarding megafaunal extinctions,it is assumed that the driving factor was

Without elephants,African grasslands convert to forests or to shrublands.Which of the following phrases are true statements about the elephant? Check all that apply.

Historical extinction rates are best known for

Natural colonization can happen in all of the following ways except

The extinction vortex

Researchers in England found that,for three out of four habitat types they were studying,the most efficient strategy was to create a system of stepping stones linking existing habitat clusters."Stepping stones" are a type of corridor.

Why might the different species of whales fail to recover even though hunting has been banned?

Island species are particularly vulnerable to extinction for all of the following reasons except

Scientists speculate that extinctions did not occur in Africa as they did on other continents because animals coevolved with ________ in Africa.

Scientists estimate that about ________ of the world's eukaryotic organisms have been discovered and given scientific names.

What becomes more likely to occur in a small population? Check all that apply.

An organism whose decline or removal from a habitat causes many other species numbers to change dramatically is called ________ species.

The process of examining the genomes of animals and plants for useful genes is

Animals that weigh more than 100 pounds are considered as