Plant–pollinator mutualisms are disrupted by a variety of competitive interactions between introduced and native floral visitors. The invasive western yellowjacket wasp, Vespula pensylvanica , is an aggressive nectar thief of the dominant endemic Hawaiian tree species, Metrosideros polymorpha . We conducted a large‐scale, multiyear manipulative experiment to investigate the impacts of V. pensylvanica on the structure and behav...

The Pleistocene geological history of the Hawaiian Islands is becoming well understood. Numerous predictions about the influence of this history on the genetic diversity of Hawaiian organisms have been made, including the idea that changing sea levels would lead to the genetic differentiation of populations isolated on individual volcanoes during high sea stands. Here, we analyse DNA sequence data from two closely related, end...