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Titlebook: Reproductive Biology of South American Vertebrates; William C. Hamlett Book 1992 Springer-Verlag New York, Inc. 1992 animals.biology.devel

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书目名称Reproductive Biology of South American Vertebrates
编辑William C. Hamlett
视频video
图书封面Titlebook: Reproductive Biology of South American Vertebrates;  William C. Hamlett Book 1992 Springer-Verlag New York, Inc. 1992 animals.biology.devel
描述South America is one of the few areas of the world that includes vast areas of as yet undisturbed natural habitats. These areas are home to as many as half the world‘s species of plants and animals. Many of the animals inhabit­ ing these areas are of direct and immediate economic importance, while others are of unknown potential value. With economic development of these areas, there is a coincident disruption of natural habitats that have a direct impact on the reproductive capabilities of the affected species. Re­ production is central to the survival of all species and, regardless of the environmental stresses imposed on them, scientific attention must be fo­ cused on reproductive biology as a way to deal with these pressures. It is vitally important to gather as much research data as possible on the repro­ ductive biology of the species on this continent in order to provide gov­ ernmental agencies and scientists with the most accurate information on which to base decisions regarding development. This volume is intended to draw attention to these pressing matters by gathering a wide representation of scientists actively engaged in reproduction research relating to South American
出版日期Book 1992
关键词animals; biology; development; environment; reproduction; vertebrates
版次1
doihttps://doi.org/10.1007/978-1-4612-2866-0
isbn_softcover978-1-4612-7701-9
isbn_ebook978-1-4612-2866-0
copyrightSpringer-Verlag New York, Inc. 1992
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Modes of Reproduction in the Elasmobranchs of Brazilies, 20% are of considerable use, and 7% represent major fisheries species (Compagno 1984). The approximately 470 species of batoids include the sawfishes, guitarfishes, skates, stingrays, and electric rays.
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Modes of Reproduction in the Elasmobranchs of Brazilrackish to fresh water estuaries, lagoons, and bays. Some sharks and stingrays, including the bull shark, ., certain sawfish (Pristidae), potamotrygonid stingrays, and dasyatid stingrays, can inhabit purely freshwater rivers and lakes. The elasmobranch fauna of Brazil is rich and diverse and is of i
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Serum Steroid Hormones During Reproduction in Elasmobranchsout 800 living species, they are highly adapted and, because of their size, numbers, and ecological role, may be considered a biologically successful group. Much of that success can be traced to the particular reproductive strategies evolved by the elasmobranch over the past 350,000,000 years. Accor
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Larval Ecology of Fish of the Orinoco Basinted in Colombia and Venezuela (Fig. 3.1). Its average discharge is estimated as 36,000 m./s (4–6 to 60.000 m./s). The main channel width varies from several meters in headwaters to 1,000 to 1,500 m in the middle to more or less 20 km at the mouth or delta. This distance is only exceeded by the Zaire
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