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Flashcards in Conservation Deck (33)
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1

How many major mass extinctions have happened in earths history

5

2

What is the 6th potential mass extinction

Climate change

3

What are examples of how humans modify the ecosystem

Cod (overfishing)
Stellar sea cow

4

What is DNA barcoding

Labeling species to help find poachers & trade of protected species

5

What are hotspots

Places with high levels of biodiversity

6

What can biodiversity be measured as?

Chemical diversity

7

What creates fragmentation

Habitat loss

8

What does habitat loss cause

Extinction and makes conservation harder

9

What is a major problem as habitats are fragmented and shrink in size

The edge effect

10

What is the edge effect

Changes in population or community structures that occur at boundary of 2 habitats

11

What do scientist speculate that African animals coevolved w in Africa that stopped extinction from occurring

Humans

12

What is a keystone

An organism whose decline or removal from a habitat causes species # to change dramatically

13

What does endemic mean

Species doing naturally in only one geopraphic area and nowhere else

14

What happens not long after humans arrive in an area

Rapid Extinction of larger animals

15

What is assumed to be the driving factor regarding megafungal extinction?

Homo sapiens

16

What are edge effects the result of?

Habitat fragmentation or habitat shrinkage

17

What are megafauna

Animals that weigh more than 100 pounds are

18

How many of earths plants may be threatened with extinction

As many as one half

19

How many areas in the world are hotspots

25

20

What is a major problem with hotspots and human moving in

Habitat destruction

21

Why is important to maintain biodiversity

Maintain genetic diversity of wild relatives of common crops

22

Why would a different species of whales fail to recover even though hunting is banned

Loss of genetic diversity

23

The introduction of what caused the losses in endemic species of lake Victoria

The Nile perch

24

When NY was given a choice regarding its drinking water

They chose ecosystem maintenance over development

25

The concern about amphibian populations is

Amphibians are sensitive to environmental changes

26

What is the extinction vortex

What happens as a population decreases and becomes more vulnerable to extinction from a variety of causes

27

What is a megafaunal extinction

Disappearance of almost all large mammals in North America about 10,000 years ago

28

Limitations of preserves

Political and economical pressure makes preserves smaller

29

What happens when species are introduced into an ecosystem that they have not evolved

It can drive several local endemic species to extinction

30

What are some ecosystem services

Maintain chemical quality of natural water

Prevent loss of minerals and nutrients

Absorb pollution

Promote organic wastes of cycling of minerals