By Cecie Starr, Ralph Taggart

Through the use of an issues-oriented process quantity 6 - Ecology and behaviour from Biology: The harmony and variety of lifestyles, 12e grabs scholar curiosity with real-life matters that hit domestic. this article contains new insurance and pedagogy that encourages scholars to imagine seriously approximately hot-button concerns and comprises notable new positive factors that take scholars past memorization and inspire them to invite questions in new methods as they learn how to interpret information.

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Additional info for Biology: The Unity and Diversity of Life, Twelfth Edition (Volume 6 - Ecology and Behavior)

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The logistic growth equation cannot be used to predict effects of density-independent factors. Take-Home Message How do limiting factors affect population growth? ᭿ Carrying capacity is the maximum number of individuals of a population that can be sustained indefinitely by the resources in a given environment. ᭿ With logistic growth, population growth is fastest when density is low, slows as the population approaches carrying capacity, and then levels off. ᭿ Density-dependent factors such as disease result in a pattern of logistic growth.

See CengageNOW for details, then vote online. 1 Population Demographics A population’s size, density, distribution, and age structure are shaped by ecological factors, and may shift over time. 1 Ecologists typically use the term “population” to refer to all members of a species within an area defined by the researcher. Studies of population ecology start with demographics: statistics that describe population size, age structure, density, distribution, and other factors. Population size is the number of individuals in the population.

Second, most seeds and some animal offspring cannot disperse far from their parents. Third, some animals spend their lives in social groups that offer protection and other advantages. With a nearly uniform distribution, individuals are more evenly spaced than we would expect on the basis of chance alone. Such distribution is relatively rare. It happens when competition for resources or territory is fierce, as in a nesting colony of seabirds. We observe random distribution only when habitat conditions are nearly uniform, resource availability is fairly steady, and individuals of a population or pairs of them neither attract nor avoid one another.

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