BiblioVault - Books about Mammal populations

Dale R. McCullough

University of Michigan Press, 1979

Mammalian Dispersal Patterns

The Effects of Social Structure on Population Genetics

Edited by B. Diane Chepko-Sade and Zuleyma Tang Halpin

University of Chicago Press, 1987

Mammalian Dispersal Patterns examines the ways that social structure affects population genetics and, in turn, rates of evolution, in mammalian groups. It brings together fieldwork in animal behavior and wildlife biology with theoretical work in demography and population genetics. The focus here is dispersal—whether, how, and when individuals leave the areas where they are born.

Theoretical work in population genetics indicates that such social factors as skewed sex ratios, restrictive mating patterns, and delayed age of first reproduction will lower the reproductive variability of a population by reducing the number of genotypes passed from one generation to the next. Field studies have shown that many mammalian species do exhibit many such social characteristics. Among horses, elephant seals, and a number of primates, the majority of females are inseminated by only a fraction of the males. In pacts of wolves and mongooses, usually only the highest-ranking male and female breed in a given season. Although socially restricted mating tends to lower genetic variability in isolated populations, it actually tends to increase genetic variability in subdivided populations with low rates of migration between subunits. Among some species there is little dispersal and thus little gene flow between subpopulations; other species travel far afield before mating.

The contributors to this volume examine actual data from populations of mammals, the way patterns of dispersal correlate with the genetic structure of individuals and populations, and mathematical models of population structure. This interdisciplinary approach has an important bearing on work in conservation of both wildlife and zoo populations, for it shows that the home range and the population size needed to maintain genetic variability can differ greatly from one species to the next. The volume also offers a fruitful model for future research.

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Metapopulations and Wildlife Conservation

Edited by Dale R. McCullough

Island Press, 1996

Development of rural landscapes is converting once-vast expanses of open space into pockets of habitat where wildlife populations exist in isolation from other members of their species. The central concept of metapopulation dynamics -- that a constellation of partially isolated patches can yield overall stability to a system that is chaotic at the level of the individual patch -- offers an important new way of thinking about the conservation and management of populations dispersed among small habitat fragments. This approach is proving to be a rich resource for biologists hoping to arrest the current catastrophic loss of biodiversity.

An understanding of metapopulation theory and analysis is critical to the modern practice of wildlife conservation and management. This volume provides a comprehensive overview of the subject, addressing the needs of an applied professional audience for comprehensible information to integrate into their practices. Leading conservation biologists, ecologists, wildlife managers, and other experts consider the emergence and development of metapopulation theory and explore its applicability and usefulness to real-world conservation programs.

Introductory chapters provide background information on basic concepts such as models, genetics, landscape configuraton, and edges and corridors. Subsequent chapters present detailed methods of analyzing metapopulation structure. Case studies of an array of vertebrate species, including the Swedish pool frog, the northern spotted owl, Stephens' kangaroo rat, Florida scrub jay, Mediterranean monk seal, Steller sea lion, tule elk, and others, illustrate nuances of metapopulation theory analysis and its practical applications.

Contributors describe what metapopulation approaches bring to wildlife conservation and management, present models of how metapopulation thinking has been applied in specific situations, and suggest the analysis required in given cases. Metapopulations and Wildlife Conservation is essential reading for anyone working in the field of wildlife conservation and managment.

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