26 when adults have a low probability of survival from ene year to the mest, mnd

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26 when adults have a low probability of survival from ene year to the mest, mnd offspring survival is relatively good, the best adult strateto (to simire mnese) is A) increase fecundity at the expense of adult survival B) increase adult survival at the espense of fecundity C) maintain a balance of fecundity and adult survival. 27 Many animals undergo a dramatic metamorphosis from larval to adult (seNually mature) forms. Poorly cannot grow as fast as well-nourished animals and therefore do not reach given mass as quickly as their nourished counterparts. metamorphosis occurs when a specific, minimum wel of the following costs is reached, which most likely incurred by a poorly shed animalh A) longer period of risk prior to reproduction B) reduced reproductive output as an adult 28 Research on frogs has shown that poorly nourished animals mature in which of the following compared to their counterparts? A) at the but at a much later age B) at the same age but at a much smaller size smaller size C) at a somewhat later age and at a somewhat 29.In recent decades, bottom-water temperature in the North Sea has increased, resulting in the greater diversity of fish species. What shift in fish species has caused in fish A) northerly species expanding their ranges southward B) southerly species expanding their ranges northward species C) increases in the number of commercially important D) all of the above 30 During winter, many resident songbirds of the north temperate zone travel in mixed-species flocks. Flocking may help these birds find food and maintain a more effective watch for predators. Which of the following dispersion pattems characterizes the individuals of these birds? C) random A) clumped B) evenly spaced 31 Determination of neighborhood size requires knowledge of the and the density of the population. in the population mates A) average size of individual organisms individual B) number of individuals of the same species with which an interacts C) number of individuals ofother species with which an individual D) lifetime dispersal area 32. The lifetime dispersal area ofa particular species of toad is 0.4 km2.The population density of toads of this species is 500/km2. What is the neighborhood size for this species? D) 400 individuals A) 1 km E) 200 individuals B) 0.4 km2 C) 500 individuals regardless 33 Populations of animals tend to consume the same amount of food per unit of area

Explanation / Answer

26a) increase fecundity at the expense of adult survival.

27 A) longer period of risk prior to reproduction

28 C) at a somewhat later age and at a somewhat smaller size

29 d) all of the above.

30 A clumped.

31d. lifetime dispersal area,.

32E. 200 indiviual

Neighborhood size = lifetime dispersal area multiplied by pop. density

=.4X500=200

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