Wildlife Damage Test #2 (Fertility Control)

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created 8 years ago by FarAway15
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College: Third year
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wildlife
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1

What are the 2 ways basic ecological models of population
growth indicate to decrease equilibrium density?

- Increase environmental resistance
– Decrease biotic potential

2

How do you change equilibrium density?

- Increase death rate
– Decrease birth rate

3

What are the two stages of fertility control?

• Contraceptive
-Prevents egg from being fertilized

• Abortive
- Kills embryo

4

What are different methods of fertility control?

– Mechanical and surgical
– Endocrine Disruption
– Immuno-contraception

5

What are some characteristics of ideal contraception?

- Reversible
-Field delivery
- Effective in single dose
- No hazard to nontarget species
- No harmful side effects
- No effect on social behavior

6

What are some reasons to use contraception?

- to reduce wildlife populations
- Reduce fertility of specific animals

7

What is the best way to reduce the population in a polygynous species?

Sterilize dominant males

8

What is the one circumstance that allows for the population to be reduced in a monogamous species?

If pair bonds are long-lasting

9

What is the one circumstance that allows for the population to be reduced in a territorial species?

If territories maintained for long time

10

Which species is more suited to fertilization control than lethal control?

R-adapted species

11

Fertilization control is not always considered most _______ method of
management

Humane

12

What are some drawback to fertility control?

- Adverse side effects
- Adverse effects to current offspring
- Lengthen breeding period
- Could effect non-target species

13

What is done during the surgical method of fertility control?

The removal of reproductive organs.

14

What is done during the mechanical method of fertility control?

Males--Devices that block sperm passage
Females--Inter-uterine device

15

What are the advantages and disadvantages of mechanical or surgical methods of fertility control?

Advantage: single treatment, permanent, no
risk to non-target

Disadvantage: surgery usually impractical

16

What are some methods of fertility control based on
endocrine system?

– Steroids
– Antiprogestins
– GnRH

17

What is the disadvantage of using steroids as a method regarding the endocrine system?

Difficult to administer, side effects, high cost (usually impractical).

18

What are some advantages and disadvantages to administering GnRH regarding the endocrine system?

Advantages: Rapidly metabolized (no environmental problems or
secondary poisoning + Reversible

Disadvantages: Suppress reproductive and social behavior +Prolong or delay breeding season + Little research

19

What happens during the Immuno-contraception method of fertility control based on the endocrine system?

Vaccine given to stimulate immune system to produce antibodies that destroy own hormones or gametes.

20

What are the advantages of gamete based immuno-contraception?

- reversible
- to affect on reproductive or social behavior

21

What are the disadvantages of hormone based immunocontraception?

- affected reproductive and social behavior
- side affects

22

What are the different delivery methods of fertility drugs?

- Remote delivery systems (darts, bullets, etc.)
- Oral delivery (baits)
- Vector delivery
- Controlled Release Methods (mechanical pump, etc)