Sexual Selection. Sexual dimorphism is common. Parental investment often differs between the sexes. Male and female seahorses which sex should be competitive and which choosy?. Strategies for the competitive sex often come at a cost. Strategy: Mate a lot!
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
which sex should be competitive and which choosy?
Mate a lot!
(Even at the cost of long-term survival)
Cold water has algae
Return to land to warm up and digest
Big body allows more efficient grazing
Small body has a better metabolic “balance”
* = largest body size at which iguanas could maintain weight in two different years
Males lost weight, females were near optimum body weight
The most successful male, iguana 59, got more than four times as many copulations as any of his rivals
Male and Female collared lizards
Male must expend energy on tail
Experimentallyshortened tails Less decline in body condition
Therefore, long tails do have a cost!
Females didn’t like the shortened tails even though the treatment improved the health of the experimental males over the season
Is this choice good for the species?
Can the choice be good for a particular female?
(yes, if the male has good genes or if her sons are attractive)
From Pryke and Andersson (2005).