Which factors (limited space or overcrowding; limited food; Predators; parasite and diseased) tend to act in a density-dependent manner; Tony Sinclair (1989) many studies of density dependence in 51 populations of insects, 82 populations of large mammals, and 36 populations of small mammals and birds. Which of the following observation is most likely true?

a) Insects showed a wide variety of causes of density dependence and no one density-dependent factor was of overriding importance

b) The lesser the amount of available food, the greater the mortality of large mammals

c) Space and social interactions were more important for smaller mammals and birds, because they are more territorial

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#Question id: 11642

#Section 1: Ecology

To obtain optimal yield, populations should be harvested at what part of the sigmoid growth curve ?

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#Question id: 4645

#Section 2: Evolution

The treeʹs horizontal axis is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V—Z) represent various common ancestors. Letʹs say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.

Which of the five common ancestors, labeled V—Z, has given rise to the greatest number of species, both extant and extinct?

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#Question id: 16779

#Section 3: Mathematics and Quantitative Ecology

Find the Median of given Grouped data. 

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#Question id: 10815

#Section 2: Evolution

The evolution of two interacting species in a community is referred to as ________________.

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#Question id: 9566

#Section 1: Ecology

Which of the following adaptations helps kangaroo  rats conserve water?