Start-up 1. Which biome has the most biodiveristy? 2. Which biome has the least biodiversity? 3. Why? *Next Wed. - all 9 th biology conference during break
Community – populations living close enough together for potential interaction In reference to a particular individual, interactions can have a: positive effect (+) negative effect (-) no effect (0) Effects may change as circumstances change!
Predation is a (+/-) interaction between species To catch prey, predators have evolved special adaptations: Predator Adaptations -acute senses -weaponry -generally fast and agile -camouflaged To escape from predators, prey have evolved special adaptations: Prey Adaptations -behavioral defenses -alarm calls -adaptive coloration & mimicry:
Herbivory (+/-) interaction Herbivore eats parts of a plant or alga Herbivore specialized adaptations: - digestive system Plant specialized adaptations: -chemical defenses (toxins, bad taste) -mechanical defenses (thorns, spines) defenses
Parasitism (+/-) interaction Parasite derives its nourishment from a host, which is harmed in the process
Mutualism (+/+) interaction Example: mychorrhizae Commensalism (+/0) interaction Example: hitchhiking barnacles on whales Commensalism video