over harvesting encourages extinction and is most likely to affect ______
large animals with low intrinsic reproductive rates
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
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...
the carrying capacity of Earth for humans is partly dependent upon which factor?
the ecological footprint of humans
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
which island should have the LOWEST rate of SPECIES INTRODUCTIONS
4 (farthest and smallest island)
may have a range that is limited by tolerance to cold temperatures
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
which species in the Antarctic food chain likely contains the HIGHEST amount of biomass within the food chain?
which of the following would decrease a reef's carrying-capacity of corals?
the destruction of rocks on which corals attach and grow
most seaweed species...
can only live within a certain range of temperature, light, and nutrient levels
which age structure pyramid shows a growing population
what is the biological significance of genetic diversity in wildlife populations?
genetic diversity reduces the probability of extinction
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?
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?
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
which islands would have the lowest rate of extinctions?
3 (largest island)
according the logistic growth equation, dN/dt=rN[(K-N)/K]
population growth is zero when N equals K
a fire wipes out an entire population of owls living in a forest. this is an example of
a density-independent effect
the main purpose of movement corridor is to ______
connect two otherwise isolated populations
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
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
which of the following limits the carrying capacity of a habitat?
which of the following nutrient cycles does NOT include a biological component?
none. they all include a biological component