Analyze Examples of Cooperative Behavior - Biology

$rB > C$. Altruism evolves when relatedness times benefit exceeds cost.

Mutual cleaning that reduces parasites and strengthens social bonds. Partners remove parasites and maintain social relationships.

Group members coordinate to deter predators or rivals. Collective defense is more effective than individual protection.

Corals and zooxanthellae algae exchange shelter for sugars. Algae photosynthesize inside coral tissue, providing mutual benefits.

Worker bees helping the queen raise larvae. Workers sacrifice reproduction to enhance colony productivity.

Workers suppress or remove eggs laid by other workers. Workers prevent cheating by enforcing reproductive division of labor.

Behavior in which individuals work together to increase fitness. This defines cooperation as coordinated actions that enhance reproductive success.

Selection favoring traits that benefit group success over individuals. Groups with more cooperators outcompete less cooperative groups.

One individual watches for danger while others forage. Guards sacrifice feeding time to protect group from threats.

Reduced individual predation risk and improved predator detection. Group living provides safety in numbers against predators.

Improved vigilance and reduced per-capita predation risk. Flocking increases predator detection and confuses attackers.

More effective hunting and defense of territory. Group coordination enables successful hunting of large prey.

Corals and zooxanthellae algae exchange shelter for sugars. Algae photosynthesize inside coral tissue, providing mutual benefits.

Rhizobia fix nitrogen; legumes provide carbohydrates and habitat. Bacteria provide essential nutrients in exchange for housing.

Pollination: insects get nectar; plants get pollen transfer. Both partners trade food resources for reproductive services.

Mycorrhizae: fungi aid mineral uptake; plants provide sugars. Both partners exchange resources essential for growth.

A close, long-term interaction between different species. Long-term relationships between species can involve cooperation.

Mutual cleaning that reduces parasites and strengthens social bonds. Partners remove parasites and maintain social relationships.

An individual provides food to another, increasing recipient survival. Donor sacrifices resources to improve another's nutritional status.

A warning signal that reduces predation risk for others. Caller risks exposure but protects group members from predators.

An individual that gains benefits without paying cooperation costs. Free-riders exploit cooperation without contributing to the system.

Start cooperative, then copy the partner’s previous action. Reciprocal strategy that rewards cooperation and punishes defection.

The tension between cooperation benefits and incentives to defect. Models conflict between mutual benefit and individual advantage.

A partner’s action increases another individual’s fitness. The action must actively improve another's survival or reproduction.

Both species benefit from the interaction. Both partners gain reproductive advantages from the interaction.

Help given based on reputation; helper gains future help from others. Helpers gain reputation and receive future help from third parties.

Help given to an individual who later helps the same helper. The same individual who was helped later returns the favor.

Helping that is favored when help is later returned. Cooperation persists because helpers eventually receive help back.

Fitness cost to the actor. The reproductive sacrifice made by the helping individual.