1. The winter food supply of buds from shurbs influences that stability of snowshoe hare populations. The available
supply of "nutritious buds" is a/an
a) density-independent limiting factor for snowshoe hare
b) example of a climax species
c) example of a community if pioneer species
d) density-dependent limiting factor for snowshoe hare
2. In winter, snowshoe hares create pathways in the snow between feeding and resting sites. These travel lanes are then
used by porcupines, making the porcupine's movement through deep snow easier. What relationship exists between the
snowshoe hare and the porcupine?
a) Mutualism
b) Intraspecific competition
c) Predator-prey
d) Commensalism
3. Gause's "Principle of Competitive Exclusion" states that when two different populations occupy the same ecological
niche, one of the populations will be eliminated. Both the mallard duck and pin-tail ducks occupy wetland areas. The
mallard duck and the pin-tail duck can live in the same habitat because there is
a) significant interspecific competition for food and breeding areas
b) significant intraspecific competition for food and breeding areas
c) little interspecific competition for food and breeding areas
d) little intraspecific competition for food and breeding areas
4. Large fishing vessels called trawlers use nets that are dragged along the seabed and often have
catastrophic effects on the sea floor habitat. Prohibiting commercial fishing by trawlers could save
not only the targeted fish species, but also many other marine species. The recovery of the sea floor
habitat after trawlers have been prohibited in a particular region is called
a) primary succession
b) pioneer succession
c) climax succession
d) secondary succession
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