Species 1 2 Type of Interaction General Nature of Interaction and Example 0 0 Neutralism Neither population affects the other. Squirrel (0), Butterfly (0) + + Mutualism* Interaction favorable to both and obligatory. Lichens: algae (+, gains water and protection), fungus (+, receives food produced by algae) + + Protocooperation Interaction favorable to both but not obligatory. Marine crab (+, gains camouflage), Sponge (+, transported to food) + 0 Commensalism* The commensal (1) benefits while the host (2) is not affected. Spanish Moss (+, support), Tree (0) + - Predation The predator (1), usually larger, kills and eats the prey (2); Snake (+, gains food), mouse (-, eaten) + - Parasitism* The parasite (1), usually smaller, attacks the host (2) Tapeworm (+, gains food), Human (-, loses energy) - 0 Amensalism Population 1 inhibited, 2 not affected Small bush (-,deprived of sun's energy), large tree (0) - - Competition Indirect inhibition of each species by the other when (Resource Use type) common resource is in short supply. Arctic Fox (-) and Arctic Owl (-) both competing for same food source (Lemmings) - - Competition Direct inhibition of each species by the other. (Direct Interference type) Mutual predation: Bream (-,eaten by Bass) Bass (-, when small eaten by Bream) (* types of symbiosis - two species living together closely) 0 not affected by the association / interaction + benefits from the association - loses from the association
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Dr. Winstead's Blood Pressure Tracker: Free Templates for Graphing Blood Pressure in Microsoft Excel
Dr. Winstead's Current Local and World Standard Percentage Metric Time Clock