Mixed-species aggregations in arthropods

How many species of arthropods? Erwin’s estimate revised

Erwin’s much debated estimate of 30 million species of arthropods is revised. The original estimate is based on the evaluation of host specificity of guilds in beetle samples, and subsequent hierarchical ratio extrapolations. The growing number of studies including mass sampling of arthropods have provided several data sets suitable for obtaining an empirical basis of this estimate. The structu...

on the status of mixed methods research in applied linguistics

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Composition of Mixed-species

cockaded woodpeckers fit most of the characteristics PECKERS used to describe nuclear members of foraging flocks, such' as conspicuous plumage and vocalization. They RICHARD R. SCHAEFER, Wildlife Habitat and aIso appear to be joined and foilowed more often than Silviculture Laboratory, Southern Research Station, they themselves join and follow other species. interest of researchers. Questions r...

Geotropic Orientation in Arthropods

The creeping of the beetle Tetraopes tetraopthalmus during negatively geotropic orientation shows the angles of orientation (theta) on a surface inclined at alpha degrees to the horizontal to be proportional to sin alpha. The direction of orientation easily suffers temporary reversal to positive as result of handling. Mechanical stability during upward progression should be just possible when K...

Mixed-species malaria infections in travelers.