Journal of Morphology, Vol. 35: Founded by C. O. Whitman (Classic Reprint) - Hardcover

McClung, C. E.

Hardcover

ISBN 10: 0656036796 ISBN 13: 9780656036790

Verlag: Forgotten Books, 2018

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Excerpt from Journal of Morphology, Vol. 35: Founded by C. O. Whitman

I have found that the males appear on the spawning grounds before the females. Usually also only males are found in the nests early in the morning and late at night. That the males appear earlier in the season than the females was observed also by Young and Cole and, according to Surface the same is true of the lake lamprey. It is therefore necessary to collect the animals when they are spawning under optimum con ditions in order to Obtain reliable data concerning sex ratio. Dean and Sumner report more males than females in the proportion Of five to one. It is easy to see how one might get such results from collections early in the season or at certain times of the day. Loman found no such disproportion of sexes in the European brook lamprey and neither have I found in the American brook lamprey an excess of one sex over the other when spawning conditions were at their optimum.

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Über diese Auflage

• Verlag: Forgotten Books
• Erscheinungsdatum: 2018
• ISBN 10: 0656036796
• ISBN 13: 9780656036790
• Einband: Tapa dura
• Anzahl der Seiten: 624