Concepts

The network of feeding relationships among organisms in an ecosystem

Age and sex characteristics affecting susceptibility to mortality

The relative proportions of chemical elements in biological systems

Categorization of invertebrates based on feeding mechanisms: collector-gatherers, grazers, predators, shredders, and suspension-feeders

Combined impact of multiple predators differs from the sum of their individual effects, can be greater or less than additive

Population estimation method using repeated sampling to remove individuals and estimate total abundance from decline curve