ecosystems and biodiversity

Question 1

what benefits do ecosystems provide

Answer 1

nutrient cycles, food, fuel, water

Question 2

why is global diveristy decreasing

Answer 2

human activity

Question 3

techniques used to collect data samples

Answer 3

quadrants, pitfall traps, sweep nets, beatingtrays, capture-mark-recapture

Question 4

what kind of data do sampling stratagies collect

Answer 4

representative data

Question 5

describe random smapling

Answer 5

items have equal probability of being chosen

Question 6

describe systematic sampling

Answer 6

selects items used in an interval

Question 7

describe quadrant sampling

Answer 7

best for studying populatiions, 3 types: (frame, grid, point)

Question 8

what type of sampling happens when a pin is dropped through a horizontal bar to count species

Answer 8

point quadrant

Question 9

pros to quadrant sampling

Answer 9

works for observing long time population changes, simple to use, allows for population density

Question 10

what are point quadrants really good for

Answer 10

dense vegitation

Question 11

limitations of quadrant sampling

Answer 11

room for error, doesnt measure dispersion patterns, overestimating dense vegitation

Question 12

how to find population density

Answer 12

add up all numbers/ by quadrants covered, multiply that by surveyed area

Question 13

how to find percent cover

Answer 13

count squares with species/total n of squares, *100`

Question 14

lincoln index equation

Answer 14

number of in. in first sample * number of in. in second sample/ marked individuals in second sample

Question 15

simpsons index of diversity

Answer 15

n/N (number of species types/ number of individuals.
square each value and add
suntract from 1

Question 16

what does the capture-mark-recapture and the lincoln index help find

Answer 16

a way to measure population sizes of individual animal species

Question 17

what happens if assumptions are violated

Answer 17

there will be sampling bias

Question 18

pitfall traps pros/cons

Answer 18

you can calculate biodiversity, not population density

Question 19

pros/cons of sweep nets

Answer 19

specific, fast and effective sweeps, allows for human error

Question 20

pro/con of kick sampling

Answer 20

quick and gets large samples, but inaccurate population density

Question 21

why are insects a global concern

Answer 21

they carry disease around the world and pollinate

Question 22

pro/con of light traps

Answer 22

large sample sizes and can monitor disease carrying insects. but also attract doesase carrying insects tpo the area

Question 23

3 developing questions

Answer 23

closed ended (yes/no) questions, survey questions neutral, and dont ask for two things at once.