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ArticleSquires, Richard L.Four new molluscan species, a bivalve and three gastropods, are named from shallow-marine, lower Upper Cretaceous (Cenomanian Stage) strata in Oregon. The laternulid bivalve Cercomya ( Cercomya ) hesperia new species is from the Bernard Formation in e . . . -
ArticleMurray, Anne-MarieFighting is often composed of discrete agonistic displays. Few studies have partitioned fighting behavior into its component agonistic displays and evaluated the relationships between the frequency of the displays and the potential benefits of fightin . . .
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ArticleSkibiel, Amy L.Results of the study by Blackburn et al. (2004a) of avifauna on oceanic islands suggest that distance from the mainland and time since European colonization have major influences on species extinctions and that island area is a significant but seconda . . .
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ArticleDiscordant patterns of morphological variation in genetically divergent populations of ornate shrewsHertel, Fritz S.Although the ornate shrew (Sorex ornatus) is widely distributed throughout California and northern Baja California, genetic analyses have shown that it is phylogeographically structured into 3 genetically differentiated regions (southern, central, and . . .
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Student ResearchMedrano, SabrinaMany pantropical marine species have a similar disjunct range across the globe. There are two hypotheses that attempt to explain these phenomena. The first hypothesis states that tropical species dispersed into newly formed oceans during the separatio . . .
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ArticleGonzález, JorgeTwo hundred and seventy one adult specimens representing 58 species in the subtribes Ctenuchina and Euchromiina (Arctiinae) were found at the entomological collections of ECOSUR (Southern Border College). The collections are based at three research st . . .
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ArticleHernández-Baz, FernandoMéxico contiene una gran diversidad de Lepidoptera (14,385 spp.), de manera que es contradictorio que solo dos especies de mariposas están oficialmente protegidas, mientras que ninguna polilla está ni siquiera en planes para su protección. Entre las 2 . . .
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ArticleAlevizon, William S.The islands off southern California diversify the coastal environment by doubling the length of shoreline and extending coastal habitats (Horn 1974). Geologically, and perhaps biologically, these islands may be classified into northern (bordering the . . .