Ecology

Definition

The scientific study of the relationships among living organisms and their environment, encompassing interactions at individual, population, community, ecosystem, and biosphere levels. In entomology and arachnology, ecology examines how insects and arachnids interact with abiotic factors (temperature, moisture, substrate) and biotic factors (predators, parasites, competitors, mutualists), and how these interactions shape distribution, abundance, behavior, and evolution.

Etymology

From Greek oikos (house, household) and -logia (study of), originally coined by Ernst Haeckel in 1866.

Example

The ecology of carrion beetles (Silphidae) involves complex inter-kingdom interactions: adults and larvae compete with flies for vertebrate carcasses, engage in intraspecific cooperation to exclude competitors, and alter the microenvironment to accelerate decomposition—demonstrating how a single insect group mediates nutrient cycling, forensic entomology timelines, and community assembly on ephemeral resources.

Related Terms

• ecosystem
• habitat
• population
• community
• niche
• trophic level
• biogeography
• Behavioral ecology
• Chemical ecology
• Conservation biology

Usage Notes

Ecology is broader than environmentalism or nature study; it is a quantitative, hypothesis-driven science. Specialists distinguish levels of organization: autecology (single species), synecology (multiple species), and ecosystem ecology (energy and nutrient flows). In arthropod research, 'ecology' often implies field-based study of life-history, spatial patterns, or species interactions rather than laboratory physiology or taxonomy. Contrast with entomology (the study of insects, which may include ecological, taxonomic, morphological, or applied approaches) and natural history (descriptive observation often without experimental hypothesis testing).