Concepts

A species that has a disproportionately large effect on its environment relative to its abundance and whose presence/absence significantly affects ecosystem structure and function

Theory that animals distribute themselves among habitat patches in proportion to resource availability, with high-quality patches becoming occupied first and animals moving to lower-quality patches as...

Morton's theory that physical behaviors and acoustic signals are associated, with aggressive behaviors linked to noisy, low-frequency sounds and submissive behaviors to higher-frequency pure tones

Breeding birds must balance energy allocation between reproduction and survival, with parasites forcing energy towards immune response rather than reproductive traits

Sapsucker-fungus partnership that strongly influences the avian community by providing nest sites