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The American Naturalist Volume 26, No. 2 download ebook

The American Naturalist Volume 26, No. 2 download ebook

The American Naturalist Volume 26, No. 2.cEssex Institute
The American Naturalist Volume 26, No. 2
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Author: Essex Institute
Number of Pages: 186 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781231122228
File size: 48 Mb
Download Link: The American Naturalist Volume 26, No. 2
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 Excerpt: ...of the ocean appears to be caused by the fragments of dead organisms, and is connected with the presence of bacteria. Since many chlorophyll-bearing organisms are found at depths unpenetrated by sunlight it has been suggested that the light necessary for their growth is furnished by the phosphorescent organisms, i The composition of the Plankton is exceedingly irregular, both in qualitative and in quantitative relations; its distribution in the ocean is also very irregular, both in time and in place. The variations occur near the shore as well as far out at sea. Very often the greater part of the mass of Plankton is made up of organisms belonging to a single group. Sometimes unicellular algre make up nearly the whole bulk, at another medusae, siphonophores or ctenophores; indeed, almost any group of marine organisms may occur in such quantities as to compose more than one-half of the total bulk of the Plankton, at that time and place. The fundamental causes of variation in the quantity and quality of the Plankton appears to be conditioned by time, climate and currents. Temporal Differences.--For a satisfactory determination of these more complete observations are needed. Reliable data can be furnished by the observations at the numerous marine laboratories and zoological stations now springing up in different parts of the world. The causes which underlie these yearly, monthly, daily and hourly variations are manifold; in part meteorological, in part biological. They are comparable to the corresponding oscillations of the terrestrial fauna and flora, and depend on the one side upon climatic and meteorological conditions, and on the other upon the varying mode of life, particularly upon conditions of reproduction and development. Just as the annual developmen...

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