Journal Article Research Support, Non-U.S. Gov't Asparagaceae Baker's law Eucomis regia Plant Nectar Research Support, U.S. Gov't, Non-P.H.S. Review Volatile Organic Compounds agricultural expansion biodiversity biogeography colonization crop diversity ecological filtering invasive species island mainland mate limitation metapopulation nectar nonflying mammal pollination pollination pollination services pollinator group pollinator limitation pollinator shift pollinator-dependent crops range expansion reproductive assurance