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612.8 --- Spinal cord. --- Senses and sensation. --- Afferent pathways. --- Spinal cord --- Sensory Receptor Cells. --- Spinal Cord. --- Coccygeal Cord --- Conus Medullaris --- Conus Terminalis --- Lumbar Cord --- Medulla Spinalis --- Myelon --- Sacral Cord --- Thoracic Cord --- Coccygeal Cords --- Conus Medullari --- Conus Terminali --- Cord, Coccygeal --- Cord, Lumbar --- Cord, Sacral --- Cord, Spinal --- Cord, Thoracic --- Cords, Coccygeal --- Cords, Lumbar --- Cords, Sacral --- Cords, Spinal --- Cords, Thoracic --- Lumbar Cords --- Medulla Spinali --- Medullari, Conus --- Medullaris, Conus --- Myelons --- Sacral Cords --- Spinal Cords --- Spinali, Medulla --- Spinalis, Medulla --- Terminali, Conus --- Terminalis, Conus --- Thoracic Cords --- Cauda Equina --- Neural Receptors --- Receptors, Sensory --- Sensory Neurons --- Sensory Receptors --- Nerve Endings, Sensory --- Neurons, Sensory --- Neuroreceptors --- Receptors, Neural --- Nerve Ending, Sensory --- Neural Receptor --- Neuron, Sensory --- Neuroreceptor --- Receptor Cell, Sensory --- Receptor Cells, Sensory --- Receptor, Neural --- Receptor, Sensory --- Sensory Nerve Ending --- Sensory Nerve Endings --- Sensory Neuron --- Sensory Receptor --- Sensory Receptor Cell --- Neurons, Afferent --- Sense Organs --- Ascending tracts --- Pathways, Afferent --- Sensory motor system --- Sensory tracts --- Central nervous system --- Sensation --- Sensory biology --- Sensory systems --- Knowledge, Theory of --- Neurophysiology --- Psychophysiology --- Perception --- Nervous system. Sensory organs --- Localization of functions. --- Physiology of nerves and sense organs --- Senses and sensation --- Afferent pathways --- Sensory Receptor Cells --- Spinal Cord --- Localization of functions
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What is the minimum dimension of a niche space necessary to represent the overlaps among observed niches? This book presents a new technique for obtaining a partial answer to this elementary question about niche space. The author bases his technique on a relation between the combinatorial structure of food webs and the mathematical theory of interval graphs. Professor Cohen collects more than thirty food webs from the ecological literature and analyzes their statistical and combinatorial properties in detail. As a result, he is able to generalize: within habitats of a certain limited physical and temporal heterogeneity, the overlaps among niches, along their trophic (feeding) dimensions, can be represented in a one-dimensional niche space far more often than would be expected by chance alone and perhaps always. This compatibility has not previously been noticed. It indicates that real food webs fall in a small subset of the mathematically possible food webs. Professor Cohen discusses other apparently new features of real food webs, including the constant ratio of the number of kinds of prey to the number of kinds of predators in food webs that describe a community. In conclusion he discusses possible extensions and limitations of his results and suggests directions for future research.
Niche (Ecology) --- Food chains (Ecology) --- Accipiter. --- Conus. --- Desmognathus. --- Hawaii. --- Lake Nyasa. --- Monte Carlo simulation. --- algorithm. --- aspen forest. --- column average. --- column variance. --- composite community. --- creek. --- eating relation. --- feeding relation. --- gastropods. --- independence of niche dimensions. --- inequalities. --- intersection graph. --- marine bench. --- niche overlap graph. --- overlap. --- predator. --- pseudo-random food web. --- qualitative stability. --- resource partitioning. --- salamanders. --- sampling. --- sink food web. --- temperature. --- uniform distribution. --- variance test. --- Food chains (Ecology). --- Niche (Ecology).
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