Agriculture

Animal Migration, Orientation and Navigation by Sidney A. Gauthreaux PDF

By Sidney A. Gauthreaux

ISBN-10: 0122777506

ISBN-13: 9780122777509

Animal Migration, Orientation, and Navigation provides many of the features of animal migration, together with the evolution of migration, climatic and meteorological affects, and bioenergetics. This ebook discusses the physiological keep an eye on, sensory structures, orientation and navigation, and organic clocks and phenology elements of animal migration.

Organized into 5 chapters, this ebook starts with an summary of the migration options of animals within the context of an area continuum. this article then explains the impression of brief- and long term climatic cycles at the spectrum of migratory styles in nature. different chapters examine the lively standards of alternative migration options and the power shops of the migrants. This ebook discusses besides the physiological foundation of animal migration, with emphasis on endocrinal findings at the timing and lively features of alternative migration concepts. the ultimate bankruptcy offers with the mechanisms utilized in course discovering via migrating animals.

This ebook is a useful source for biologists and ecologists.

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Sample text

Selection for such migration could result from the necessity for particular substrate and current characteristics for maximum egg hatch, from reduced predation on eggs and young in shallow headwaters, from higher production of food for young fish, and from ex­ clusion of adults from headwaters by winter ice or very likely all four. Esox may also exploit migrating Catostomus. In Texas the Mexican tetra Astyanax mexicanus has apparently extended its range northward by evolv- 40 Hugh Dingle ing seasonal migration to exploit the warmest sections of streams (Edwards, 1977).

The temperatures in the pools reached 31 °C as opposed to a max- 28 Hugh DingJe imum of 24°C in the lake; flight muscles developed in pool individuals while those in the lake remained flightless. The selective advantage of such a mechanism is clear. The advantage of flightlessness is not so obvious, but flightless individuals survived longer and laid more eggs under conditions of food deprivation suggesting greater efficiency in the aquatic habitat. Fur­ ther studies on the adaptive advantage of flightlessness are clearly needed.

Here reproduction takes place somewhat before peak water level. The peak is the time of maximum food production for both adults and young and hence is the main feeding time and the period of rapid growth. As the dry season progresses, the rivers contract often to a series of shallow channels and pools at lowest water levels. At this time environmental pressures such as deoxygenation, low food production, and heavy predation are at their extreme. Fishes may still move up and down the available channels, however.

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Animal Migration, Orientation and Navigation by Sidney A. Gauthreaux


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