adj.(of biological species or speciation) occurring in the same or overlapping geographical areas

Sympatric speciation by sexual selection
Sympatric speciation suggested by monophyly of crater lake cichlids.
Sympatric speciation in phytophagous insects: moving beyond controversy?
Dietary separation of sympatric carnivores identified by molecular analysis of scats.
Natural selection and parallel speciation in sympatric sticklebacks
SYMPATRIC HOST RACE FORMATION AND SPECIATION IN FRUGIVOROUS FLIES OF THE GENUS RHAGOLETIS (DIPTERA, TEPHRITIDAE)
Interactions among quantitative traits in the course of sympatric speciation
Physiological tolerances of three sympatric riparian wolf spiders (Araneae: Lycosidae) correspond with microhabitat distributions
Home Range, Territoriality, and Ecological Separation in Sympatric Shrews, Sorex vagrans and Sorex obscurus
A comparison of the diet and fine-scale distribution of sympatric Tibetan and red foxes in Qinghai, PR China