Crabs of the genus Plagusia Latreille, 1804 (Crustacea: Brachyura: Plagusiidae) are well known for their habit of clinging to driftwood or ship hulls and are therefore prone to trans-oceanic transport. One of the consequences of this large dispersal potential seems to be the circumtropical distribution of one species, Plagusia depressa (Fabricius, 1775). This species comprises two subspecies, t...

Plants of Juniperus communis L. var. communis, J. c. var. depressa Pursh, J. c. var. jackii Rehdr, J. c. var. saxatilis Pall. were sampled and SNPs from nrDNA were examined. Based on these data and previous data, a new variety of J. communis is recognized: Juniperus communis var. charlottensis R. P. Adams, var. nov. It occurs in muskeg bogs on Queen Charlotte Island, British Columbia and in the...

In a microcosm experiment, I tested how species composition, species richness, and community age affect the susceptibility of grassland communities to invasion by a noxious weed (Centaurea solstitialis L.). I also examined how these factors influenced Centaurea’s impact on the rest of the plant community. When grown in monoculture, eight species found in California’s grasslands differed widely ...