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This study draws on data from numerous sources that support the paradigm of natural hybridization as an important evolutionary process. The review of these data results in a challenge to the framework used by many evolutionary biologists, which sees the process of natural hybridization as maladaptive because it represents a violation of divergent evolution. In contrast, this book presents evidence of a significant role for natural hybridization in furthering adaptive evolution and evolutionary diversification in both plants and animals.

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This study draws on data from numerous sources that support the paradigm of natural hybridization as an important evolutionary process. The review of these data results in a challenge to the framework used by many evolutionary biologists, which sees the process of natural hybridization as maladaptive because it represents a violation of divergent evolution. In contrast, this book presents evidence of a significant role for natural hybridization in furthering adaptive evolution and evolutionary diversification in both plants and animals.

The Kieffer Pear tree has been around since the 1870s and has yet to lose its popularity among fruit tree lovers! Produced by Peter Kieffer as an accidental cross hybridization between Sand Pear and Bartlett Pear.The Pyrus communis Kieffer pear tree produces large, long delicious yellow fruit with a crimson blush overtone. The Kieffer cultivar typically ripens from September to mid-October and requires 350-400 chill hours for best results. Its lush green foliage makes it an optimum landscape tree.Are Kieffer pears good to eat? You bet it! The white flesh of these yellow pears is delicious! The Kieffer pear taste can tantalize your taste buds! It has a crisp, juicy flavor and coarse texture that is excellent for canning, baking pies, preserves, or even eating freshly picked.

Every year, a number of new forest pathosystems are discovered as the result of introduction of alien pathogens, host shifts and jumps, hybridization and recombination among pathogens, etc. Disease outbreaks may also be favored by climate change and forest management. The mechanisms driving the resurgence of native pathogens and the invasion of alien ones need to be better understood in order to draft sustainable control strategies. For this Special Issue, we welcome population biology studies providing insights on the epidemiology and invasiveness of emergent forest pathogens possibly by contrasting different scenarios varying in pathogen and host populations size, genetics, phenotype and phenology, landscape fragmentation, occurrence of disturbances, management practices, etc. Both experimental and monitoring approaches are welcome. In summary, this special issue focuses on how variability in hosts, pathogens, or ecology may affect the emergence of new threats to plant species.

A history of the interrelationships among French Creoles and Central Siouan tribes, narrating a story of politics, trade, and the rise and decline of the fur economy on the lower Missouri River. Thorne (history, U. of California), arguing that cultural and biological hybridization is an underappreciated aspect of the region's historical development, redresses this historical gap by portraying the intermarriages between French fur traders and native women, their family networks, and the influences that persons of mixed ancestry had in tribal politics during the era of white settlement and Indian removal. Includes photographs. Annotation c. by Book News, Inc., Portland, Or.