BIS 2B Lecture Notes - Lecture 18: Herbivore, Commensalism, Conditionality

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Building from what we know about single species and layering on interactions with other species Learn how we classify different types of species interactions. Understand how interaction outcomes can depend on the environment. Understand how species interactions determine population dynamics and are sources of selection. Intraspecific interactions are between members of the same species. Interspecific interactions are between individuals from two different species. Interspecific interactions are sources of selection ( evolution ) & they determine the distribution and abundance of species ( ecology ) Competition for a shared resource can reduce carrying capacity. Predators or parasites can keep n below k or even cause local extinction. Beneficial interactions among species may be able to increase k. Competition : when 2 species have negative effects on each other (- / -) Amensalism : when 1 species has no effect on the other, and 1 has a negative effect (0 / -)

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