New Blind Characid Fish from Southeastern Brazil PDF Download
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Author: James E Böhlke, Martin R Brittan
Publisher: Academy of Natural Sciences
ISBN: 9781604833805
Category : Characidae
Languages : en
Pages : 4
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Book Description
Author: James E Böhlke, Martin R Brittan
Publisher: Academy of Natural Sciences
ISBN: 9781604833805
Category : Characidae
Languages : en
Pages : 4
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Book Description
Author: Eleonora Trajano
Publisher: CRC Press
ISBN: 1439840482
Category : Science
Languages : en
Pages : 496
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Book Description
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
Author: Aldemaro Romero
Publisher: Springer Science & Business Media
ISBN: 9401597952
Category : Science
Languages : en
Pages : 366
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Book Description
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:
Publisher: Academy of Natural Sciences
ISBN: 9781437955316
Category :
Languages : en
Pages : 284
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Book Description
Author: Roberto E. Reis
Publisher: EDIPUCRS
ISBN: 9788574303611
Category : Fishes
Languages : en
Pages : 748
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Book Description
Author: Academy of Natural Sciences of Philadelphia
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 172
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Book Description
Author:
Publisher: Academy of Natural Sciences
ISBN: 9781437955323
Category :
Languages : en
Pages : 260
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Book Description
Author: Academy of Natural Sciences of Philadelphia
Publisher:
ISBN:
Category : Electronic journals
Languages : en
Pages : 768
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Book Description
"Publications of the Academy of Natural Sciences of Philadelphia": v. 53, 1901, p. 788-794.
Author: Rüdiger Riesch
Publisher: Springer
ISBN: 3319133624
Category : Science
Languages : en
Pages : 329
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Book Description
This book summarizes the key adaptations enabling extremophile fishes to survive under harsh environmental conditions. It reviews the most recent research on acidic, Antarctic, cave, desert, hypersaline, hypoxic, temporary, and fast-flowing habitats, as well as naturally and anthropogenically toxic waters, while pointing out generalities that are evident across different study systems. Knowledge of the different adaptations that allow fish to cope with stressful environmental conditions furthers our understanding of basic physiological, ecological, and evolutionary principles. In several cases, evidence is provided for how the adaptation to extreme environments promotes the emergence of new species. Furthermore, a link is made to conservation biology, and how human activities have exacerbated existing extreme environments and created new ones. The book concludes with a discussion of major open questions in our understanding of the ecology and evolution of life in extreme environments.
Author: Academy of Natural Sciences of Philadelphia. Library
Publisher:
ISBN:
Category : Natural history
Languages : en
Pages : 744
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Book Description
