October 28 Flashcards Preview

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Flashcards in October 28 Deck (18):
1

What percentage of species to inhabit the earth are extinct?

90%

2

How has the human race affected the extinction rate?

Increasing it

3

Name four species extinct as a direct result of human over hunting.

Stellers sea cow
Passenger pigeon
Great auk
Sea otter

4

Define ecologically extinct.

Animal still exists but small population cannot sustain its ecological role

5

Define extirpated.

Species is extinct from local area but exists elsewhere

6

Give an example of a trophic cascade

Sea otter eats sea urchin eats kelp which house fish which are eaten by Eagles

7

What is prey switching?

Animals adapting to new situations

8

Define contemporary evolution.

Evolution of biological traits based on interactions with humans. Fish have decreased in size

9

Name two reasons for hunting exotic endangered animals.

Medicine
Economic gain

10

True or false
Sea horses are considered an aphrodisiac

True

11

What does CITES stand for?

Convention of international trade endangerment schedule

12

What is a dugong?

A marine animal related to the sea cow in Australia. Tusks are protection and they sleep on sea grass beds

13

What part of the dugong is used to make love potion?

Tears

14

Name two reasons elephants are hunted.

Value and they compete with humans for space

15

What two continents are elephants from?

Asia and Africa

16

How do you differentiate Asian and African elephants?

African elephants have bigger ears and the Asian males have tusks

17

Define trophy hunting

Hunting for sport

18

How many great extinction periods are there?

5