Concepts

The study of reproductive behaviors, nesting habitat selection, and breeding success in bird populations

Bird species that utilize nest cavities created by other species rather than excavating their own

The process by which parent birds maintain optimal temperature conditions for their nestlings through behavioral modifications including incubation, shading, and nest attendance patterns

Acoustic phenomena including subharmonics, biphonation, deterministic chaos, and warbles that occur when vocal production apparatus loses control

Territorial behavior including alarm and warning calls to protect midden from squirrels and other mammals, with territories ranging from 0.5 to 1 hectares defended through vocalizations and chasing

A statistic derived from information theory that quantifies individuality by calculating inter-individual variation relative to intra-individual variation

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

Number of nests per unit area, calculated by dividing number of nests in each habitat by total area

Hypothesis that nonlinear phenomena are more variable or more abrupt and therefore more unpredictable, making animals less likely to habituate to them and causing prolonged responses

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

Fragmented vegetation structure affecting bird population abundances and foraging opportunities

Physiological responses of the immune system to pathogens, trauma, stress and inflammation

Quantitative measure of acoustic similarity between sounds, ranging from 0 to 1.0 with higher correlations indicating more similar sounds

Males infected with parasites will have reduced mate attraction as a consequence of less enhanced secondary sexual characters due to energy allocation to immune response

A brief but generalized sickness syndrome triggered by bacterial infections and LPS injection

Blood parasites including Haematazoa subclass with four main genera: Leucocytozoon, Haemoproteus, Plasmodium, and Trypanosoma, vectored by dipterans

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

Percentage of nest area hidden from predators when viewed from directly above, measured using gridded circle

Traits like crown-stripe width, plumage coloration, and song that require additional energy to maintain and signal mate quality

Behavioral activity of birds when captured in traps, measured as activity index from feeding to high distress behaviors

Change in frequency of sound waves due to relative motion between source and observer

Colors that stimulate multiple cone types simultaneously but cannot be produced by monochromatic light, such as purple