Hawks and owls rely on similar prey, but hawks feed during full daylight while owls hunt and feed from dusk to dawn. This is an example of which of the following? * resource partitioning intraspecific competition commensalism parisitism
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A: Ans TRUE.
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- If the ecological footprint per person of a country or theworld is larger than its biological capacity per person toreplenish its renewable resources and absorb the resulting waste products and pollution, the country or theworld is said to have an ecological deficit. If the reverse istrue, the country or the world has an ecological credit orreserve. See Figure 1.11 for a map of the world’s ecologicaldebtor and creditor countries. Use the data to the right tocalculate the ecological deficit or credit for the countrieslisted. (As an example, this value has been calculated andfilled in for the world.)1. Which three countries have the largest ecologicaldeficits? For each of these countries, why do youthink it has a deficit?2. Rank the countries with ecological credits in orderfrom highest to lowest credit. For each country, whydo you think it has an ecological credit?3. Rank all of the countries in order from the largest tothe smallest per capita ecological footprint.Which trophic level(s) must be present to sustain any ecosystem?a. producers onlyb. producers and consumersc. producers, detritivores, and decomposersd. producers, consumers, detritivores, and decomposersA fishprint provides a measure of a country’s fish harvestin terms of area. The unit of area used in fishprint analysisis the global hectare (gha), a unit weighted to reflect therelative ecological productivity of the area fished. Whencompared with the fishing area’s sustainable biocapacity (itsability to provide a stable supply of fish year after year,expressed in terms of yield per area), its fishprint indicateswhether the country’s annual fishing harvest is sustainable. The fishprint and biocapacity are calculated using thefollowing formulas:Fishprint in (gha) = metric tons of fish harvestedper year/productivity in metric tons per hectare ×weighting factorBiocapacity in (gha) = sustained yield of fish in metrictons per year/productivity in metric tons per hectare ×weighting factorThe following graph shows the earth’s total fishprint andbiocapacity between 1950 and 2000. Study it and answerthe following questions: If biologists determine that this country’s sustainedyield of fish is…
- True or False: Among the three types of ecological pyramids, the most useful is the pyramid of biomass because it shows how much kilocalories are available at each trophic level.The number of trophic levels in an ecosystyem are limited.Comment.A species' ______ is all the habitats in which it can live, and all of the resources it is capable of exploiting. A. realized niche B. fundamental niche
- Whichstatement about changing ecosystem properties during succession is false?a.Biomass increasesb.Community respiration increasesc.Primary production increasesd.Soil depths decreasee.Stream spiraling lengths decreaseAs a general rule, for each jump up in trophic level, about how much does the available energy drop? Group of answer choices practically 100 percent 90 percent 10 percent 30 percent 50 percentAt which point in the trophic pyramid is the greatest arount (not percentage) of energy lost? A) Between the primary producers and the primary consumers B) Between the primary consumers and the secondary consumers C)Between the secondary consumers and the tertiary consumers D) Between the secondary consumers and the primary producers
- The greatest biomass of primary mammalian consumers in Biome A comprises grazers. True FalseAkeystone species is one:a.that makes up a very large proportion of total community biomass.b.that feeds on a very large fraction of all available prey species.c.that is fed on by a very large fraction of all predators in itscommunity.d. whose feeding activities have adisproportionate effect on the structure of its community.e.that occupies the lowest level (the base) of the food web.Which trophic level in an aquatic ecosystem would contain the greatest amount of usable energy? Primary consumers located 150 meters below sea level. Primary producers located 80 meters below sea level. Primary producers located 45 meters below sea level. Primary consumers located 40 meters below sea level.