Nov11LectureNotes08 - Novmber 11th 2008 Notes taken by Dr...

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Novmber 11 th 2008 Notes taken by Dr Balko during lecture. (ppt) Routine Class Matters ~ Reading assignments for Today Chp 35, thereafter Ch 36 and 37. Prelim II results will be posted on BLACKBOARD by tomorrow. (ppt) Summary slide of the 5 questions of behavior. (ppt) Foraging behavior of Jaguars… [Figure 37.12D] Given the following characteristics of the following two prey species, we see that predation has potential costs that trade-off with the benefits. • Nine-Banded Armadillos, only about 5kg of food for the Jaguar, are abundant and easy to catch • 200 kg Baird’s Tapirs are less abundant and run quickly • To forage optimally, a jaguar can do better by searching for armadillos, as long as they are common , and eating tapirs if it happens on a good opportunity • So, what are the potential costs of foraging behavior? (ppt) Clicker Question. Which of the following would you expect to be true of a specialized carnivorous mammal that eats only rare, relatively large, aggressive long-horned cattle? (a) High search costs, high risks, high pay-off per item (b) Low search costs, low risks, low pay-off per item (c) High search costs, low risks, low pay-off per item (d) High search costs, high risks, low pay-off per item (e) Low search costs, low risks, high pay-off per item Answer = a (ppt) Social behavior & Sociobiology ~ read about this in the text [Figure 35.13 – mouth brooding fish] • Mating behaviors obviously enhance reproductive success, and mating systems may be promiscuous, monogamous, or polygamous ( polygynous, polyandrous ) Sociobiology studies social behavior, the interactions of two or more animals, in an evolutionary sense • The needs of offspring and certainty of paternity help explain differences in mating systems and parental care by males 1
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Novmber 11 th 2008 Notes taken by Dr Balko during lecture. (ppt) Social behavior & Sociobiology cont • Courtship rituals advertise the species, sex, and physical condition of males • In some species, courtship is a group activity in which members of one or both sexes choose mates from a group of candidates (ppt) Social behavior & Sociobiology cont [Fig 35.16 A,B] • Animals exhibiting territorial behavior mark and defend parcels of space and resources • Territorial rights are proclaimed continually in a variety of ways, including by bird songs, noises such as the bellowing of sea lions and the chattering of squirrels, defecation in open areas, scent markers such as urine… What about humans…? • Distinguish between gannets and cheetah? (ppt) Agonistic Behavior [Figures 35.17, 35.18] READ ABOUT THIS IN TEXT Animals typically don’t fight to the point of injury, but rather fight to partition resources (for example. mates). Instead of fighting to the death, they usually In dominance hierarchies, agonistic behavior is used to partition resources
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This note was uploaded on 10/21/2009 for the course BIO G 109 at Cornell University (Engineering School).

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Nov11LectureNotes08 - Novmber 11th 2008 Notes taken by Dr...

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