Nemerteans of the Pacific Coast of North America, Vol. 1 (Classic Reprint)
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| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from Nemerteans of the Pacific Coast of North America, Vol. 1 Stops were made also on St. Paul, St. Matthew, and Hall Islands in Bering Sea; at Plover Bay, Siberia, and at Port Clarence, Alaska, just south of Bering Strait. At these latter localities, however, the shores are surrounded in winter by pack ice, which prevents the existence of any considerable amount of life between tides. No Nemerteans were found here between tides in the limited time at our command, though it is not unlikely that in deeper water an abundance of these worms could have been obtained by the dredge. South of Bering Sea, on the other hand, the shores are densely covered nearly to high water mark with a luxuriant growth of nearly all classes of invertebrates. All along that part of the coast which borders the North Pacific Ocean - from Dixon Entrance to the Aleutian Islands - with the exception of areas subject to local disturbing elements, such as the proximity of rivers and glaciers, invertebrates occur in remarkable abundance. Not only is there an enormous number of individuals, but also a great variety of species. And, furthermore, the unusually large size which many of the species attain is quite as striking as the wealth of species and individuals. The purity of the water, its freedom from contamination from muddy streams, and the great rise and fall of the tides with their consequent swift currents, which continuously provide a rapidly changing supply of pure water, furnish conditions especially favorable to the growth of marine invertebrate animals. Exceptions to these favorable conditions were found at Juneau, where the water is of slightly less than normal density, and contains a considerable amount of sediment. At Skagway these unfavorable conditions are still more pronounced, and here very few Nemerteans could be found between tides. In Russell Fiord the water was decidedly brackish, there was little tide, and almost no shore collecting could be done. Localities in the vicinity of glacier fronts were extremely barren of marine life, as was to be expected. Perhaps the locality which proved the most fruitful was Dutch Harbor, Unalaska, although the stations in Prince William Sound were but little inferior, and Sitka was found to possess an extremely rich littoral fauna. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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