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NORTH PACIFIC POLYCHAETA, CHIEFLY FROM THE WEST COAST OF VANCOUVER ISLAND, ALASKA, AND BERING SEA |
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Canadian Journal of Research,
Volume 20d,
Issue 7,
1942,
Page 183-208
E. Berkeley,
C. Berkeley,
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摘要:
A list is given of 175 species of Polychaeta collected at the northern extremity of the west coast of North America; seven of the species are new to the entire coast, 29 to the northern extremity, and four new to science.Notes are given on distribution and taxonomic characters of many of the known forms and the new species are described.
ISSN:1923-4287
DOI:10.1139/cjr42d-016
出版商:NRC Research Press
年代:1942
数据来源: NRC
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THE EFFECT OF ASPHYXIATION UNDER VARIOUS TENSIONS OF CARBON DIOXIDE ON THE SWIM BLADDER GASES OF SOME FRESHWATER FISH |
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Canadian Journal of Research,
Volume 20d,
Issue 7,
1942,
Page 209-219
Virginia Safford Black,
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PDF (618KB)
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摘要:
Freshwater physostomous fish, possessing open swim bladders (dace, sucker, chub, bullhead, trout), and physoclistous fish, having closed swim bladders (perch, bass, pumpkin-seed, stickleback), were sealed in bottles of water saturated with air and containing various amounts of dissolved carbon dioxide. After asphyxiation, an analysis of the swim bladder gases showed that the swim bladder had gained some carbon dioxide and lost some oxygen. Fish with closed swim bladders possessingretia mirabiliaand ovals, vascular networks that facilitate gas exchange, show a markedly greater exchange of gases during the experiments than fish with open swim bladders which have no intensely vascular regions on the swim bladder wall. The oxygen that leaves the swim bladder during asphyxiation is probably of no significant value to the fish for respiration.
ISSN:1923-4287
DOI:10.1139/cjr42d-017
出版商:NRC Research Press
年代:1942
数据来源: NRC
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