Arthur C. Medeiros

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The alien plant problems of Haleakala National Park are substantial but may be fewer than those of other Hawai`ian natural areas, partly because most of the Park is at high elevation (75% above 5,000 ft or 1,525 m). However, potential problems with alien plants are still not clear because of the suppression of all vegetation by intense herbivory by feral(More)
The erythrina gall wasp (EGW), believed native to Africa, is a recently described species and now serious invasive pest of Erythrina (coral trees) in tropical and subtropical locales. Erythrina are favored ornamental and landscape trees, as well as native members of threatened ecosystems. The EGW is a tiny, highly mobile, highly invasive wasp that deforms(More)
The present study characterizes the spatial distribution of seaweed diversity on eight islands from the South Shetlands based on an updated taxonomic survey, discussing the higher number of species compared with previous studies and the possible relationships with environmental parameters. Seaweeds were sampled in Deception, Livingston, Halfmoon, Robert,(More)
We summarize information on current distribution of the invasive lizard Chamaeleo jacksonii and predict its potential distribution in the Hawaiian Islands. Potential distribution maps are based on climate models developed from known localities in its native range and its Hawaiian range. We also present results of analysis of stomach contents of a sample of(More)
Geranium hanaense, a new species endemic to two small montane bogs (20 ha total) on northeast Haleakala, Maui, Hawaiian Islands, is described. This new species is postulated to have evolved from the high elevation xeromorphic species,G. cuneatum, in a fashion similar to that of the two other bogGeranium species. The ecology and evolution of HawaiianGeranium(More)
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