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i Natural Resources, Cornell University, Ithaca, NY 14853-3001. James R. Karr is a professor in the departments of Fisheries and Zoology, Box 357980, University of Washington, Seattle, WA 981957980. Karen L. Prestegaard is an associate professor in the Department of Geology, University of Maryland, College Park, MD 20742. Brian D. Richter is national(More)
Understanding the mechanisms by which nonnative species successfully invade new regions and the consequences for native fauna is a pressing ecological issue, and one for which niche theory can play an important role. In this paper, we quantify a comprehensive suite of morphological, behavioral, physiological, trophic, and life-history traits for the entire(More)
N. LEROY POFF*, BRIAN D. RICHTER , ANGELA H. ARTHINGTON , STUART E. BUNN , ROBERT J. NAIMAN § , ELOISE KENDY , MIKE ACREMAN**, COLIN APSE, BRIAN P. BLEDSOE, MARY C. FREEMAN § § , JAMES HENRIKSEN , ROBERT B. JACOBSON*** , JONATHAN G. KENNEN, DAVID M. MERRITT , JAY H. O’KEEFFE § § § , JULIAN D. OLDEN , KEVIN ROGERS**** , REBECCA E. THARME AND ANDREW WARNER(More)
1. In an effort to develop quantitative relationships between various kinds of flow alteration and ecological responses, we reviewed 165 papers published over the last four decades, with a focus on more recent papers. Our aim was to determine if general relationships could be drawn from disparate case studies in the literature that might inform(More)
www.frontiersinecology.org © The Ecological Society of America C based on the perceived needs of ecosystems versus humans for fresh water are increasingly seen in the news. In the US, a fiery debate has erupted in the Klamath basin of Oregon and California, where farmers have protested the loss of irrigation water to protect endangered fish, and where over(More)
Very high energy gamma-rays probe the long-standing mystery of the origin of cosmic rays. Produced in the interactions of accelerated particles in astrophysical objects, they can be used to image cosmic particle accelerators. A first sensitive survey of the inner part of the Milky Way with the High Energy Stereoscopic System (HESS) reveals a population of(More)
X-ray binaries are composed of a normal star in orbit around a neutron star or stellar-mass black hole. Radio and x-ray observations have led to the presumption that some x-ray binaries called microquasars behave as scaled-down active galactic nuclei. Microquasars have resolved radio emission that is thought to arise from a relativistic outflow akin to(More)
A significant fraction of the energy density of the interstellar medium is in the form of high-energy charged particles (cosmic rays). The origin of these particles remains uncertain. Although it is generally accepted that the only sources capable of supplying the energy required to accelerate the bulk of Galactic cosmic rays are supernova explosions, and(More)
Animal movements are influenced by the structure and arrangement of patches in a landscape. Most movement studies occur in terrestrial landscapes, though aquatic landscapes are equally heterogeneous and feature patches that differ in resistance to animal movements. Furthermore, the variable and highly directional flow of water over streambed landscapes is a(More)
We report the detection of TeV γ-rays from the shell-type supernova remnant RX J0852.0−4622 with data of 3.2 h of live time recorded with H.E.S.S. in February 2004. An excess of (700 ± 60) events from the whole remnant with a significance of 12σ was found. The observed emission region is clearly extended with a radius of the order of 1 and the spatial(More)