Biotic Factors (Living)
* Predation: Predators select for prey with adaptations that help them avoid being eaten, such as camouflage, speed, or defense mechanisms.
* Competition: Competition for resources like food, water, or territory selects for individuals with traits that make them more successful competitors.
* Parasitism: Parasites can select for hosts with resistance to infection or parasites that are better at finding and infecting hosts.
* Disease: Diseases can select for individuals with resistance to specific pathogens.
* Mutualism: Mutualistic relationships can select for traits that benefit both species involved.
* Herbivory: Herbivores can select for plants with defenses against being eaten, such as thorns, toxins, or unpalatable tastes.
Abiotic Factors (Non-living)
* Temperature: Temperature can select for organisms that are adapted to survive in extreme temperatures, either hot or cold.
* Sunlight: Sunlight availability can select for plants that can thrive in different light conditions, such as shade-tolerant or sun-loving species.
* Water availability: Water availability can select for organisms that are drought-tolerant or require abundant water.
* Soil composition: Soil composition can select for plants with adaptations for different soil types, such as nutrient availability or water retention.
* Wind: Wind can select for organisms with adaptations to withstand strong winds, such as strong roots or flexible stems.
* Salinity: Salinity can select for organisms that can tolerate high salt concentrations, such as those living in saltwater environments.
Examples:
* Biotic: A species of rabbit that develops a faster running speed due to predation by foxes.
* Abiotic: A species of cactus that develops thicker stems and deeper roots due to limited water availability in its desert environment.
* Biotic and Abiotic: A species of tree that evolves a more efficient photosynthesis process due to both increased competition for sunlight and changes in the average temperature.
Note:
* Biotic and abiotic factors often interact and influence each other. For example, changes in temperature can affect the distribution of prey, which in turn can affect predator populations.
* Selection pressure can vary depending on the specific environment and the organisms living within it.
* Evolution is a continuous process, and selection factors can change over time, leading to further adaptation and diversification.
