PSYCH 3T03 Chapter Notes - Chapter 11: Three-Spined Stickleback, Ethinyl Estradiol, Combined Oral Contraceptive Pill
13 Apr 2018
School
Department
Course
Professor
Document Summary
Article 11: an endocrine disrupter increases growth and risky behaviour in three-spined sticklebacks (gasterosteus aculeatus) Sticklebacks are great because : widely distributed, easy to rear and study in lab, a lot is known about their biology, large geographic variation in behaviour and morphology. This study picked individuals from two di erent populations (in terms of predation risk and size) Theory rationale : gonadal steroids can have positive e ects on growth in sh. Friday, april 13, 2018: gonadal steroids (especially estrogens) have been shown to increase activity levels in vertebrates, which may increase encounter rates with food, resulting in increased growth- also increases encounter rate with predators. Note: previous studies showed faster-growing animals, or animals with greater energy requirements, may be more willing to risk exposure to predators to gain food. By rearing sh in mixed family groups, di erent social conditions that might arise because of behavioural di erences among families were controlled for.
