Proposed Establishment of Key Cave National Wildlife Refuge, Environmental Assessment (EA).
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Page : pages
File Size : 18,40 MB
Release : 1994
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Page : pages
File Size : 18,40 MB
Release : 1994
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Page : 48 pages
File Size : 39,95 MB
Release : 1991
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Author : U.S. Fish and Wildlife Service. Region 4
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Page : 29 pages
File Size : 45,6 MB
Release : 1994
Category : Key Cave National Wildlife Refuge (Ala.)
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Page : 284 pages
File Size : 33,66 MB
Release : 2013-02
Category : Delegated legislation
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Author : Karst Waters Institute
Publisher :
Page : 134 pages
File Size : 44,92 MB
Release : 1997
Category : Nature
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Page : 162 pages
File Size : 16,33 MB
Release : 1991
Category : Environmental impact analysis
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Author : Arthur Tillman Potts
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Page : 24 pages
File Size : 39,29 MB
Release : 1924
Category : Rio Grande Valley
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Author : Aldemaro Romero
Publisher : Springer Science & Business Media
Page : 366 pages
File Size : 10,36 MB
Release : 2013-06-29
Category : Science
ISBN : 9401597952
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
Page : 1971 pages
File Size : 26,97 MB
Release : 2004-08-02
Category : Reference
ISBN : 1135455082
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.
Author : Eleonora Trajano
Publisher : CRC Press
Page : 496 pages
File Size : 27,81 MB
Release : 2010-05-20
Category : Science
ISBN : 1439840482
In most habitats, adaptations are the single most obvious aspects of an organism's phenotype. However, the most obvious feature of many subterranean animals are losses, not adaptations. Even Darwin saw subterranean animals as degenerates: examples of eyelessness and loss of structure in general. For him, the explanation was a straightforward Lamarc