AnswersEcologyQuestions1

- b The organisms are “relicts” that established in the habitat during an earlier time when conditions or resources were more suitable for

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1. What do an asexual spore, a male and a female duck, a pregnant female fish, or a potentially free living fragment of a modular plant all have in common? a. They are all early successional species. b. They are all "K-selected” (for success at high population densities). c. They are all propagules. d. They are all members of the same trophic level. e. They are all keystone species. Answer: c 2. For exponentially growing populations, dN/dt = rN where N is the number of individuals and dt is a vanishingly small interval of time. The units of “r” , the intrinsic rate of increase for a population, are a. individuals/time b. individuals c. 1/time d. time e. length/time Answer: c 3. If organisms occur in parts of the habitat that ecologists believe is outside of their Fundamental Niche, which of the following is probably NOT a possible explanation a. The organisms are immigrating to a population sink from a better habitat somewhere else (a source)
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Unformatted text preview: b. The organisms are “relicts” that established in the habitat during an earlier time when conditions or resources were more suitable for persistence, and only older individuals living off of stored reserves persist now. c. The ecologists are mistaken about the conditions the organisms could tolerate or the resources that they require d. The organisms are feeding on resource subsidies that are flowing into the environment from an outside source, but have not been detected by the ecologists. e. The organisms are dispersal limited, and so cannot reach other habitats Answer: e 4. Which factor drives the seasonality in day length and temperature experienced by northern and southern regions on Earth? a. The Coriolis Effect b. The tilt of the Earth’s axis c. The elliptical orbit of Earth around the Sun, so distance between the two varies d. The greater intensity of radiation that strikes the equator relative to the poles e. Adiabatic cooling of air as it rises Answer: b...
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This note was uploaded on 02/16/2010 for the course CHEM 3A taught by Professor Frechet during the Spring '10 term at UC Davis.

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