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Lecture 7

2nd half Lecture 7

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Department
Biology
Course
BIO318Y5
Professor
Darryl Gwynne
Semester
Summer

Description
Lecture 7 Dimorphism in horn size & concomitant mating tactics in dung beetles The horn type of a male is conditional not only on its own body size, but also on a cue of the level of sexual competition that the larval male is likely to encounter as an adult Because dung quality is predictable, being high when fruit is a large part of the monkey diet, male beetles can vary their development adaptively. When the quality of dung eaten is high, male larvae of a certain body size are more likely to mature hornless because the high-quality food signals that the population-wide body size of rival males will on average be higher. Quantity of food (random) + quality (predictable) => decides how the male beetles will develop. The Stalk-eyed fly male grows eyes on very long stalks to impress the females. Sexual dimorphism. Has costs to males! Tropical: found in groups on plants. Genes and individuals can be in conflict. Mate Choice and Levels of Selection goods or services -> females want for direct benefits good genes -> good for the offspring superior quality compatibility -> no inbreeding runaway issues-> not want male to run away
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