Evolution

Reproductive Behavior and Evolution by Ernst Mayr (auth.), Jay S. Rosenblatt, B. R. Komisaruk

By Ernst Mayr (auth.), Jay S. Rosenblatt, B. R. Komisaruk (eds.)

The Daniel S. Lehrman Memorial Symposia sequence will submit the court cases of symposia dedicated to the evolution, improvement, and association of habit. those a variety of symposia will collect at periods scientists learning difficulties from each one of those view­ issues. the purpose is to try to combine our wisdom derived from those assorted resources and to familiarize scientists engaged on related habit styles with the paintings in their colleagues in similar fields of analysis. each one quantity, for this reason, could be dedicated to a particular subject within the box of animal habit, for you to be explored with recognize to its evolutionary points, together with the adaptive nature of the behav­ ior; with admire to its developmental elements, together with neural, hor­ monal, and experiential affects; and with recognize to the research of positive aspects of association, together with motivational, perceptual, and motor points and their physiological bases. it truly is our feeling that the main acceptable memorial to our colleague and shut buddy, Daniel S. Lehrman, is the continuation of his helpful contributions towards integrating those methods to the examine of animal habit, which he pursued so successfully in the course of his personal lifestyles. Daniel S. Lehrman's lifelong love and research of animal habit gave us a wealth of recent insights into reproductive habit and evolution. it truly is as a result acceptable that the 1st symposium of this sequence is dedicated to fresh advances during this field.

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Eisenberg As McBride (1964) points out, one must not think of vertebrate social systems as static entities, either in space or in time. With a simplified diagram (Eisenberg, 1966, p. 15), I tried to indicate that regardless of the form of dispersion in space of the species in question, at least three critical phases occurred in the development of the next generation: (1) the time during which the adult male and female pair and mate, (2) the time of parturition and early maternal care, followed by (3) the time during which the littermate group moves about with the female prior to dispersal.

In the chimpanzee the tendency for the group to fragment into food-searching parties seems related to the extreme sexual permissiveness and the relative absence of autocratic hierarchy formation. It seems likely that the extensive regulation of affect in chimp groups is related to these relatively unstructured sociosexual conditions. Evolution of Parental Care with Particular Reference to the Male Among mammals litter size probably reflects the number of young that can be raised successfully (Lack, 1954).

Horses, geladas). (D) Monogamy occurs in a few species. Male and female live together in a territory, and both participate in rearing young. , coyotes, marmosets). (E) In large herds males may relate to one another in some form of a dominance hierarchy only the more senior members of which have access to females in estrus. Consorting is relatively short and males tend to mate with several females. There is no paternal care in the strict sense since paternity is uncertain, but collectively males show considerable caring behavior and protective activities in relation to both females and young.

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