Biogeography

Definition

The study of the spatial distribution of species, populations, and ecosystems across geographic space and through evolutionary time, including the historical and ecological processes that create these patterns. In arthropod research, biogeography addresses questions of endemism, range expansion, vicariance, and dispersal limitation—critical for understanding island insect radiations, the spread of invasive species, and the conservation of relict arachnid faunas.

Etymology

Greek bios (life) + geōgraphia (description of the Earth's surface)

Example

The biogeography of Hawaiian Drosophila fruit flies reveals how founder events and ecological diversification produced over 800 endemic species from a single ancestral colonization, illustrating the interplay of dispersal ability, island age, and adaptive radiation in shaping insect diversity.

Synonyms

• geographic ecology

Related Terms

• Zoogeography
• phytogeography
• vicariance
• Dispersal
• Endemism
• range
• faunistics
• Island biogeography
• phylogeography
• metapopulation

Usage Notes

Zoogeography (animal distribution) and phytogeography (plant distribution) are traditional subdisciplines; phylogeography adds genetic and genealogical data to historical explanations. Biogeography differs from simple faunistics or floristics by seeking causal explanations—historical (continental drift, vicariance) or ecological (climate, competition, dispersal)—rather than merely cataloguing occurrences. In entomology, microhabitat patchiness and flight ability strongly influence biogeographic patterns at scales from meters to continents.