Fifty Years of Darwinism : Modern Aspects of Evolution ; Centennial Addresses in Honor of Charles Darwin, Before the American Association for the Advancement of Science, Baltimore, Friday, January 1, 1909
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In our eReader you can find the full English version of the book. Read Fifty Years of Darwinism : Modern Aspects of Evolution ; Centennial Addresses in Honor of Charles Darwin, Before the American Association for the Advancement of Science, Baltimore, Friday, January 1, 1909 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Fifty Years of Darwinism : Modern Aspects of Evolution ; Centennial Addresses in Honor of Charles Darwin, Before the American Association for the Advancement of Science, Baltimore, Friday, January 1, 1909
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Fresh-water fishes are not a group different from salt-water fishes. Many salt-water fishes can enter fresh water, and we may for present purposes assume that all candidates for fresh- "water existence are adapted or readily adaptable to the fresh water. Adaptations to the second and third of the fresh-water conditions imply pe- culiarities in habit or structure not possessed by all fishes, and these must, in the main, have been acquired by the marine fishes before they could enter and maintain... themselves in fresh water.
ADAPTATION 185 The downward current and sediment, if the lat- ter is not too abundant, are not obstacles suf- ficient to keep an adult fish from entering fresh waters. The eggs and young furnish the point of attack. Among oceanic fishes we have many that have pelagic eggs, others that have adhesive eggs, others that have heavy cohesive eggs, others that have filaments for the attachment of eggs, while others harbor their eggs.
Currents would naturally tend to carry pelagic eggs into the ocean, and as far as I know only one fish with pelagic eggs has succeeded in estab- lishing itself in fresh water, and it, the eel, to the present day, descends to the sea to deposit its eggs!
What to read after Fifty Years of Darwinism : Modern Aspects of Evolution ; Centennial Addresses in Honor of Charles Darwin, Before the American Association for the Advancement of Science, Baltimore, Friday, January 1, 1909?
You can find similar books in the "Read Also" column, or choose other free books by American Association for the Advancement of Science to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Fresh-water fishes are not a group different from salt-water fishes. Many salt-water fishes can enter fresh water, and we may for present purposes assume that all candidates for fresh- "water existence are adapted or readily adaptable to the fresh water. Adaptations to the second and third of the fresh-water conditions imply pe- culiarities in habit or structure not possessed by all fishes, and these must, in the main, have been acquired by the marine fishes before they could enter and maintain... themselves in fresh water.
ADAPTATION 185 The downward current and sediment, if the lat- ter is not too abundant, are not obstacles suf- ficient to keep an adult fish from entering fresh waters. The eggs and young furnish the point of attack. Among oceanic fishes we have many that have pelagic eggs, others that have adhesive eggs, others that have heavy cohesive eggs, others that have filaments for the attachment of eggs, while others harbor their eggs.
Currents would naturally tend to carry pelagic eggs into the ocean, and as far as I know only one fish with pelagic eggs has succeeded in estab- lishing itself in fresh water, and it, the eel, to the present day, descends to the sea to deposit its eggs!
What to read after Fifty Years of Darwinism : Modern Aspects of Evolution ; Centennial Addresses in Honor of Charles Darwin, Before the American Association for the Advancement of Science, Baltimore, Friday, January 1, 1909?
You can find similar books in the "Read Also" column, or choose other free books by American Association for the Advancement of Science to read onlineMoreLess
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