In this situation, Dung Beetles are using the feces of large mammals (like Howler Monkeys) as food for their eggs. The trees need to get their seeds dispersed away from the parent tree. Howler Monkeys feed on the tree fruit and leaves of many species of tree. Based on our special types of species definitions, Howler Monkeys are a(n) , species in the rainforest.O ClinalO Commensal EndemicO Keystone
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36. Elephants are not the most common species in African grasslands nor do they account for the largest amount of biomass. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. Thus the elephants are critical to maintaining the grasslands. Elephants can be defined as what type of species in the community? A. Redundant B. Dominant C. Keystone D. Dominant and keystone E. None of the above 37. In the nitrogen cycle, the bacteria that replenish the atmosphere with N2 are: A. Rhizobium bacteria. B. nitrifying bacteria. C. denitrifying bacteria. D. methanogenic protozoans. E. nitrogen-fixing bacteria. For questions 38-42, refer to the organisms in a grassland ecosystem listed below. They represent a food chain from grass to hawks (in trophic order). Each term may be used once, more than once, or not at all. A. Grass B. Grasshoppers C. Shrews D. Snakes E. Hawks 38 An autotroph. 39. An herbivore. 40. Smallest biomass. 41. Incorporates the greatest amount of energy. 42. Probably the highest internal concentration of toxic pollutants. 43. A top predator that contributes to the maintenance of species diversity among its animal prey could be appropriately termed a: A. keystone species. B. keystone mutualist. C. landscape species. D. primary consumer. E. none of the above
Adi S.
Keystone species: are more expendable than commensal species, from a conservation perspective. occur only in intertidal zones. are primary producers and therefore usually are plants. can be removed from a habitat without any impact on the remaining species in the habitat. play an unusually important role in determining the species composition in a habitat. A particular species of animal has fur, binocular vision, and hands that can wrap around branches. This animal is shown to have a very close genetic similarity to Homo sapiens. Which of the following animals could this NOT be? lemur orangutan gorilla chimpanzee baboon
Shveta P.
Toucans disperse seeds of key forest species such as juçara palms by eating the fruit and defecating the seeds in new locations, sometimes more than a kilometer away. If there are no toucans, is the genetic diversity of palms likely to increase or decrease within forest fragments (and why)? a. increase (due to increased genetic drift) b. decrease (due to decreased gene flow) c. decrease (due to decreased mutation rate) d. decrease (due to decreased natural selection)
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