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Ecologists and evolutionary biologists are broadly interested in how interactions between plants and insects vary among and across geographic ranges. When populations are geographically isolated (i.e., allopatric) by physical barriers, such as mountain ranges, straits, or waterways, geographic variation in traits among populations may be observed (Thompson, 1994). In response to natural selection, species-specific traits may provide a fitness advantage to a given population located in a particular area and not necessarily to populations located in other areas (Zovi

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