Museum of Natural History PDF ePub eBook

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Museum of Natural History free pdf Excerpt from Museum of Natural History: University of Kansas Lawrence The hybrid fishes described herein are Chrosomus erythrogaster (Rafinesque) X Notropis cornutus frontalis (Agassiz), C. erythrogaster X Semotilus atromaculatus (Mitchill), Campostoma anomalum plumbeum (Girard) X S. atromaculatus, Gila nigrescens (Girard) X Rhinichthys cataractae (Valenciennes), and Notropis venustus venustus (Girard) X Notropis whipplei (Girard). Two of the combinations have been reported, without descriptions, in literature (citations below), and Hubbs (1955: Fig. 3) graphically indicated hybridization between the same genera with which this paper is concerned, but did not designate the species involved. All specimens of C. erythogaster X N. c. frontalis, C. erythrogaster X S. atromaculatus, C. a. plumbeum X S. atromaculatus, and N. v. venustus X N. whipplei were taken in a period of severe drought in Kansas and Arkansas. All were from small, spring-fed streams that support large populations of fishes. That the drought of 1953-1956 had pronounced effects on stream habitats in Kansas has been documented by Minckley and Cross (1959). Satisfactory sites for spawning may have been few, but an abundance of adult fishes persisted from earlier, wet years. Unusual crowding of spawning fishes would increase the opportunity for fertilization of the eggs of one species by sperm from another species. We think that the hybrids reported here (excepting G. nigrescens X R. cataractae) are explainable on the basis of crowding- we have no information about stream-conditions where the last-named hybrid was found. Generally, hybridization of fishes seems most common in areas that have been subject to radical climatic change in the past 20,000 or fewer years (Hubbs, 1955: 18-19), and in streams that have been altered recently by the activities of man (Hubbs and Strawn, 1956: 342, and others). Streams from which we report hybrids probably were affected by overgrazing of their watersheds- overgrazing was unusually severe in the drought. 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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Details Book

Author : Unknown Author
Publisher : Forgotten Books
Data Published : 27 September 2015
ISBN : 133053624X
EAN : 9781330536247
Format Book : PDF, Epub, DOCx, TXT
Number of Pages : 722 pages
Age + : 15 years
Language : English
Rating :

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    Free Ebook Download App. Excerpt from Museum of Natural History: University of Kansas Lawrence The hybrid fishes described herein are Chrosomus erythrogaster (Rafinesque) X Notropis cornutus frontalis