quiz 5 Ch 13

Question 1

modes of resource competition

Answer 1

exploitative

interference

Question 2

exploitative

Answer 2

differential ability to acquire resources.
don’t interact directly
use resources available to others

Question 3

interference

Answer 3

direct aggressive interaction between individuals

Question 4

types of interference

Answer 4

intraspecific or interspecific

Question 5

competition for resources ___ at higher population densities

Answer 5

increases

Question 6

plant growth rate and weight ___ in low density populations

Answer 6

increases

Question 7

self thinning

Answer 7

intense competition causes mortality among competing plants causing

Question 8

intraspecific

Answer 8

competition between two spp doesn’t not affect a 3rd party

Question 9

interspecific

Answer 9

competition between two spp affects a 3rd party

Question 10

case study: alfalfa density v. dry weight

Answer 10

~ 3 units increase in plants weight with each 2 unit decrease in population density

Question 11

case study: infraspecific competition among planthoppers

hypothesis

Answer 11

they aggregate, rapid growth, and unstable food supply

wanted to see how their density affects body length, survivorship, and development

Question 12

case study: infraspecific competition among planthoppers

result

Answer 12

high densities lead to small body length, low survival. and short developmental time

Question 13

niches

Answer 13

all environmental factors that influence growth, survival, and reproduction

Question 14

Hutchinson’s definition of niche

Answer 14

n -dimensional hype volume
fundamental niche- hypervolume
realized niche

Question 15

Gause: principle of competitive exclusion

hypothesis

Answer 15

2 spp. with identical niches cannot coexist and the better competitor will eventually exclude the other

Question 16

Gause: principle of competitive exclusion

result

Answer 16

when grown alone there was intraspecific competition.

when grown together P. caudatum declines due to reduced resource supplies

Question 17

fundamental niche can be changed by

Answer 17

strong and persuasive interaction lead to evolutionary response

Question 18

character displacement

Answer 18

interspecific competition cause two species to differ more from each other in geographic areas where they occur together and distributions do not overlap

Question 19

allopatric character displacement

Answer 19

two spp occur apart leading to similar charcteristics (overlap)

Question 20

sympatric character displacement

Answer 20

two spp occur together leading to directional selection (no overlap)

Question 21

lotka - volterra model of competition

Answer 21

effect of interspecific competition on population growth of each spp.

Question 22

alpha competition coefficient

Answer 22

effect of one spp on the other

Question 23

isocline

Answer 23

anywhere along line there in no population growth
below isocline pop. is decreasing.
above line the population. is increasing