Aggregations

• pros of aggregation


  vigilance, confusion, dilution, hunt success/size, infanticide, parental assistance, information sharing, finding mates, asexual reproduction
• cons of aggregation


  detectable, resource competition, run out of resources, disease/paratsites
• dilution effect


  reduced probability of getting caught, in principle, danger of a successful predator attack in divided equally among group member
• confusion effect


  phenomenon where ability of predators to single out and track individuals decreases when prey moves in a group. reduces predator attack:kill ratio
• pros of increase in temperature on aggregations


  metabolic rate increased, less energy exerted on foraging/vigilance, accelerated food growth, locate easier
• cons of increase in temperature on aggregations


  decreased DO levels, densely aggregated fish, hypoxic levels, proliferation of pathogens, spreads easier in group
• pros of decrease in temperature on aggregations


  lower metabolic rates, even less energy usage, decreased predator activity
• cons of decrease in temperature on aggregations


  limited food availability, reduced activity in cohesive shoals