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Languages : en
Pages :
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Languages : en
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Category :
Languages : en
Pages : 48
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Category : Delegated legislation
Languages : en
Pages : 284
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Author: Karst Waters Institute
Publisher:
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Category : Nature
Languages : en
Pages : 134
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Category : Environmental impact analysis
Languages : en
Pages : 162
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Author: Arthur Tillman Potts
Publisher:
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Category : Rio Grande Valley
Languages : en
Pages : 24
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Author: United States. Bureau of Land Management
Publisher:
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Category : Environmental law
Languages : en
Pages : 160
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Author: Aldemaro Romero
Publisher: Springer Science & Business Media
ISBN: 9401597952
Category : Science
Languages : en
Pages : 366
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Hypogean (cave, artesian) fishes have fascinated researchers even before they were described in the scientific literature in 1842. Since then, a number of scientists have used them to justify their own evolutionary ideas, from neo-Lamarckism to neo-Darwinism, from neutral evolution to selectionist approaches. Research in recent years has shown that these fishes are much more complex in their adaptations to the subterranean environment than previously believed: there are those with features expected from living in total darkness (complete blindness and depigmentation) and poor in nutrients (extremely low metabolic rates); others differ very little, if any, from their epigean (surface) ancestors in their morphology and physiology (but not so in their behavior). Some of them even live in nutrient-rich environments. Actually, one of the most overlooked facets of these animals is that there are more species of hypogean fishes without troglomorphisms (blindness, depigmentation) than with troglomorphic ones. The study of these apparently `unadapted' fishes is providing new insights into our understanding of the evolution of phenotypic characters, founding effect, behavioral, and physiological adaptations. The 86 species of troglomorphic fishes described so far belong to 18 different families, many of which would hardly fit the notion that they were 'preadapted' to conquer the underground environment. Further, many troglomorphic `species' show very little genotypic differentiation when compared with their putative ancestors, indicating that massive phenotype changes can be achieved via little genetic reorganization, a reorganization that mostly affects regulatory genes. These and many other topics are discussed in this volume containing 29 papers, written by 41 authors from 9 countries. Hopefully, this volume will convince many other researchers that hypogean fishes represent a unique opportunity to study a concept in evolutionary biology that is only superficially understood: convergent evolution.
Author: John Gunn
Publisher: Routledge
ISBN: 1135455082
Category : Reference
Languages : en
Pages : 1971
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The Encyclopedia of Caves and Karst Science contains 350 alphabetically arranged entries. The topics include cave and karst geoscience, cave archaeology and human use of caves, art in caves, hydrology and groundwater, cave and karst history, and conservation and management. The Encyclopedia is extensively illustrated with photographs, maps, diagrams, and tables, and has thematic content lists and a comprehensive index to facilitate searching and browsing.
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Category : Endangered species
Languages : en
Pages : 226
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