exam4 Flashcards


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created 3 years ago by samanthaw4
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bio 2
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1

over harvesting encourages extinction and is most likely to affect ______

large animals with low intrinsic reproductive rates

2

sardines display life history traits of an r-selected species. therefore, compared to other fish species you would expect sardines to...

reach sexual maturity early

3

in a particular case of secondary succession, three species of wild grass all invaded a field. by the second season, a single species dominated the field and the other two species had a lower relative abundance. a possible factor contributing to the abundances of these species in this example of secondary succession is...

inhibition

4

the carrying capacity of Earth for humans is partly dependent upon which factor?

the ecological footprint of humans

5

which of the following changes should INCREASE the net primary productivity of the ecosystem described?

the bottom of a shallow ocean reef receives more sunlight after the water becomes clearer

6

which island should have the LOWEST rate of SPECIES INTRODUCTIONS

4 (farthest and smallest island)

7

endothermic species

may have a range that is limited by tolerance to cold temperatures

8

Imagine five forest communities, each with one hundred individuals distributed among four different tree species (W, X ,Y, and Z). which forest community would be the most diverse?

25W, 25X, 25Y, 25Z

9

which species in the Antarctic food chain likely contains the HIGHEST amount of biomass within the food chain?

phytoplankton

10

which of the following would decrease a reef's carrying-capacity of corals?

the destruction of rocks on which corals attach and grow

11

most seaweed species...

can only live within a certain range of temperature, light, and nutrient levels

12

which age structure pyramid shows a growing population

pyramid shape

13

what is the biological significance of genetic diversity in wildlife populations?

genetic diversity reduces the probability of extinction

14

imagine a population of 1,000 wolves. of these, 200 are breeding females, 200 are breeding males, and 600 are non breeding juveniles. what is the effective population size?

400

15

a population of naked-mole rats with a population size of 200 and a net reproductive rate of 1.5 would be expected to have how many individuals in the next generation?

300

16

as you climb a tall mountain in Mexico, from low altitudes to high altitudes, you may see many changes similar to what you would see going from low latitudes to high latitudes. which of the following trend with increasing latitude would you NOT expect with increasing altitude on this mountain in Mexico?

decreasing length of growing seasons due to limited light light availability

17

which islands would have the lowest rate of extinctions?

3 (largest island)

18

according the logistic growth equation, dN/dt=rN[(K-N)/K]

population growth is zero when N equals K

19

a fire wipes out an entire population of owls living in a forest. this is an example of

a density-independent effect

20

the main purpose of movement corridor is to ______

connect two otherwise isolated populations

21

a population of kangaroos has an annual per capita birth rate of 0.06 and an annual per capita death rate of 0.01. calculate an estimate of the overall number change in population size over one year, for a given starting population of 1,000 individuals

50 individuals added

22

the map below... which of the following distribution shift might be expected for these species in light of climate change?

the mainland species probably will expand its range, to the north and south. the species in Cuba and Jamaica are unlikely to see a substantial range shift

23

which of the following limits the carrying capacity of a habitat?

resource limitation

24

which of the following nutrient cycles does NOT include a biological component?

none. they all include a biological component