7. Outline two examples illustrating the adaptive value of rhythmical behavior patterns.
Example: moonrats, Echinosorex gymnura
- nocturnal
- foraging at night in lowland forests, by smell
- for invertebrates, which are also active at night
- when predators are less active
- rest in holes during the day, where they are difficult to locate
Example: red deer, Cervus elaphus
- reproduce in the autumn, following an annual cycle
- both males and females are only sexually active in autumn months
- males fight to establish dominance hierarchies
- females form herds associating with a single dominant male, with whom they mate
- gestation occurs over winter, offspring born in spring
- system maximizes fitness for:
- young: maximizing feeding time before 1st winter
- females: mate only with highest quality male
- males: large genetic payoff for dominant male, at cost of no genetic payoff for excluded males