Population Ecology Flashcards Preview

Entomology > Population Ecology > Flashcards

Flashcards in Population Ecology Deck (17)
Loading flashcards...
1

What is a population?

- Individuals living in an area
- likely they can inbreed

2

What characteristics do populations have?

- Density
- Sex Ratio
- Gene frequency
- Distrrubution

3

How do you determine density?

- Indirect methods
- Comparisons

4

What are some indirect ways to determine density?

- Sweep nets
- Beat samples
- Pitfall trap
- Pheromone trap

5

What are some direct estimates of density?

- Count per area
- Berlese funnel
- Insects on alfalfa
- Mark + Recapture

6

What does the total population =? From mark recapture estimates

Total marked/ Proportion marked in the second sample

7

What are the assumptions of the mark + recapture methods?

- Marks stay on
- Marks dont kill the insects
- Insects dont leave or come into the area
- Mortality of marked and unmarked is the same

8

What do gene frequencies determine?

Ability to adapt or become resistant

9

Where are insects often found/distributed?

Often clumped:
- Edges
- Good plants
- Family Groups

10

What is an indicator of a good plant?

- Nitrogen levels indicated by color of plant
- Plant size

11

What increases of a population?

Births an immigration

12

What decreases a population?

Deaths and emigration

13

What are some intrinsic factors of density?

- fecundity (number of eggs)
- Physiology
- Behavior
- Genetic variability

14

What are some extrinsic factors of density?

- Weather
- habitat quality
- competitors
- predators
- disease

15

What is population ecology?

patterns of population change

16

What is a life table analysis?

study of survival and reproduction of populations

17

What is involved in a life table analysis?

1. Count life stages
2. Determine what kills life stages
3. Determine total mortality