| 1. |
A PRELIMINARY ACCOUNT OF THE UNIONIDAE OF ONTARIO |
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Canadian Journal of Research,
Volume 15d,
Issue 8,
1937,
Page 147-155
A. La Rocque,
J. Oughton,
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摘要:
This study is based on an examination of museum specimens and records in the literature. The Unionidae of Ontario comprise 45 species and 18 varieties. Their distribution in the various drainages is shown in a table and the fauna of each area is discussed. The doubtful species and three erroneous records are noted.
ISSN:1923-4287
DOI:10.1139/cjr37d-013
出版商:NRC Research Press
年代:1937
数据来源: NRC
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| 2. |
SOME OBSERVATIONS ON THE OVERWINTERING OF CERTAIN HELMINTH PARASITES OF SHEEP IN CANADA |
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Canadian Journal of Research,
Volume 15d,
Issue 8,
1937,
Page 156-162
Henry J. Griffiths,
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PDF (354KB)
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摘要:
The helminths,Meniezia expansa,Ostertagia circumcincta,Nematodirus filicollisandTrichostrongylus colubriformisdemonstrated the ability to survive a normal Canadian winter and to cause infection of sheep when ingested during the following spring. Temperatures during the four-month period ranged from −15° F. to 52.5° F. It is concluded that pastures cannot be considered free from these helminths after exposure to such temperatures.
ISSN:1923-4287
DOI:10.1139/cjr37d-014
出版商:NRC Research Press
年代:1937
数据来源: NRC
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