Plant samples of Cardamine hupingshanesis (Brassicaceae), Ligulariafischeri (Ledeb.) turcz (Steraceae) and their underlying top sediments were collected from selenium (Se) mine drainage areas in Enshi, China. Concentrations of total Se were measured using Hydride Generation-Atomic Fluorescence Spectrometry (HG-AFS) and Se speciation were determined using liquid chromatography/UV irradiation-hyd...

In the dragonßy Perithemis tenera Say, males defend territories around oviposition sites and defense of a site is critical for reproductive success. This study Þrst demonstrated that individual males variedconsistently inhow long theydefendedaparticular territorywithin aday(their “tenure”) and in the quality of the sites they defended. I then investigated a number of factors that may have affec...

For the majority of insects, a female's choice of oviposition site(s) greatly influences both the success of individual offspring and her own total fitness. Theory predicts that females most strongly limited by egg number will employ greater oviposition site discrimination than those predominately subject to time limitation. The reproductive success of the butterfly Pieris virginiensis at our C...

THEORY IN STRATEGIC MANAGEMENT RICHARD A. BETTIS,* ALFONSO GAMBARDELLA,2 CONSTANCE HELFAT,3 and WILL MITCHELL4,5 1 Strategy and Entrepreneurship Department, Kenan-Flagler Business School, University of North Carolina, Chapel Hill, North Carolina, U.S.A. 2 Department of Management and Technology, CRIOS, Bocconi University, Milan, Italy 3 Tuck School of Business, Dartmouth College, Hanover, New H...