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New PDF release: The Ethology of Predation

By Eberhard Curio

ISBN-10: 3642810284

ISBN-13: 9783642810282

ISBN-10: 3642810306

ISBN-13: 9783642810305

Predation is an ecological issue of virtually common significance for the biol­ ogist who goals at an figuring out of the behavior and buildings of animals. regardless of its pervasive nature critiques range as to what predation fairly is. to date it's been outlined in simple terms in adverse phrases; it truly is notion to not be par­ asitism, the opposite nice technique in which one organism harms one other, nor filter-feeding, carrion-eating, or shopping. therefore, you'll outline predation as a strategy through which an animal spends a few attempt to find a dwell prey and, moreover, spends one other attempt to mutilate or kill it. Ac­ cording to this utilization of the be aware a nudibranch, for instance, that feeds on hydroids will be a predator inasmuch because it wishes your time to find col­ onies of its prey which, after being situated, scarcely call for greater than consuming, which differs little from looking. From the definition simply proposed intake of the prey following its trap has been deliberately overlook­ ted. certainly, an animal will be disposed of with no being eaten. consequently the organic value of predation should be greater than to keep up meals­ al homeostasis. in reality, predation can have whatever in universal with the extra direct kinds of pageant, an aspect that would be purely cursorily touched upon during this book.

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Extra resources for The Ethology of Predation

Example text

In their presence the mother releases the victim in order to elicit a chase and kill from the cubs. If these fail the mother may repeat the whole cycle until the cubs succeed in capturing the escaping prey (Schaller, 1972, p. 309). Finally, there is sound evidence that the approvisioning of food for the offspring is under the control from stimuli emanating from the young rather than under the control of hunger from the parents. First, parent birds of many species augment their feeding frequency with increasing brood size though not in proportion to it (review Lack, 1954; 1966).

A more thorough study of how palatability, handling of prey, hunting method, and metabolic needs contribute to regulating the two types of hunt would be rewarding. A similar qualification applies to piracy in birds which might be due to a motivation in its own right rather than to hunger alone (p. 161). The nature of switching has been most fully explored for drinking behavior oflaboratory rats (Morrison, 1974). The animal switches from one solution to another irrespective of which of the two solutions is the more palatable.

The former authors found that members of the Pieridae and the Lycaenidae resemble each other and fly together. They assumed that the combined mortality rate is shared as a common burden of attack by predators, so that there is "safety in numbers". The selective force favoring resemblance would lie in the fact that the proportion of anyone prey species destroyed would be less than in the absence of "arithmetic mimicry". For the model to work one has to asThe idea actually goes back to Wallace (1889, p.

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The Ethology of Predation by Eberhard Curio

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