By John Theberge, Mary Theberge

During this considerate yet overlong quantity, half box memoir and half clinical review, married naturalists John and Mary Theberges (Wolves and desolate tract) probe the connection among evolution and ecology with the provocative questions that experience pushed a lot in their 30-year careers: "How is life's tremendous self-organization comprehensive? while and why may possibly it fail?" Distinguishing the dual facets of usual selection-the strain for survivability and the strain (in men) to draw sexual awareness from females-the duo express the way it "is no longer adequate on its own to provide an explanation for the lifestyles of order." particularly, order and complexity spring from the main easy legislation of subject, obvious in "sand ripples on a beach" or "chemical reactants"; the Theberges push the speculation that "phenotype plasticity" on the most simple degrees let animals with exact genes to become separate subspecies, a technique analogous to the differentiation of stem cells into a variety of tissues (liver, epidermis, muscle). The duo additionally unpacks the ecological demanding situations for the human species (food scarcity, pollutants, overpopulation, etc.), caution that we can have handed the purpose of sustainability.

Show description

Read Online or Download The Ptarmigan's Dilemma: An Exploration into How Life Organizes and Supports Itself PDF

Similar evolution books

Evolutionary ecology: concepts and case studies

Evolutionary Ecology concurrently unifies conceptual and empirical advances in evolutionary ecology and offers a quantity that may be used as both a prime textbook or a supplemental examining in a complicated undergraduate or graduate direction. the focal point of the booklet is on present recommendations in evolutionary ecology, and the empirical research of those suggestions.

Human Mitochondrial DNA and the Evolution of Homo sapiens

Mitochondrial DNA is without doubt one of the such a lot explored genetic structures due to what it may well let us know concerning the human prior. This quantity takes a different viewpoint, proposing the disparate strands that needs to be tied jointly to use the program. From molecular biology to anthropology, records to historic DNA, this primary quantity of 3 offers the worldwide photo of human mitochondrial DNA edition.

The Making of India: Geodynamic Evolution

This e-book provides in a concise layout a simplified and coherent geological-dynamical historical past of the Indian subcontinent (including Sri Lanka, Bangladesh, Myanmar, Southern Tibet and Pakistan). Encompassing a large array of knowledge with regards to constitution and tectonics, stratigraphy and palaeontology, sedimentation and palaeogeography, petrology and geochemistry, geomorphology and geophysics, it explores the geodynamic advancements that came about from the start round three.

Extra resources for The Ptarmigan's Dilemma: An Exploration into How Life Organizes and Supports Itself

Sample text

Linear, unimodal, or logarithmic). Establish a relevant grain of analysis The last step in defining the landscape is to define a relevant grain (or minimum mapping unit) and digital data model. In some cases, these decisions will be guided by technical considerations owing to the source of the data and the data processing software available. In most cases, a raster data model will be desirable. Additionally, the grain of the data should represent a balance between the desire for accurate calculations of landscape composition and configuration, computa­ tional efficiency, and the desire to scale patterns appro­ priately for the chosen landscape extent.

For example, Mills (1995) documented that voles in southwest Oregon were almost nonexistent near forest edges compared to forest interiors and attributed the difference to the lack of truffles (the vole’s preferred food) near forest edges due to the drier microclimate. Unfortunately, despite the many studies documenting trends in species abun­ dances and distributions near edges, few studies have How landscapes affect population genetic processes attempted to determine causes of the observed patterns (Kremsater & Bunnell 1999).

2 Metapopulations Metapopulations are literally populations of populations connected by dispersal (Levin 1974; Hanski & Gilpin 1991). Metapopulation theory has been formalized in a number of alternative models (Harrison 1991, 1994; Harrison & Taylor 1997), which largely differ in the rate and direction of individual movement among habitat patches. At its simplest, the theory holds that within each habitat patch the population has a finite probability of extinction, and likewise each patch has a particular colonization rate based on the number of occupied patches in the metapopulation (Fig.

Download PDF sample

Rated 4.97 of 5 – based on 40 votes