Learn More
Perturbations in ecosystems consist of a sequence of 2 events: the disturbance, marked by the application of the disturbing forces, and the response shown by the biota to the damage inflicted by the disturbance. The disturbance must be effectively characterized, without confounding it with the response, for progress to be made in the study of the(More)
T he importance of rivers and streams for fresh water, food, and recreation is well known, yet there is increasing evidence that degradation of running waters is at an alltime high (1). More than one-third of the rivers in the United States are listed as impaired or polluted (2), and freshwater withdrawals in some regions are so extreme that some major(More)
M.A. PALMER,* E.S. BERNHARDT,* J. D. ALLAN,† P.S. LAKE,‡ G. ALEXANDER,† S. BROOKS,‡ J. CARR,§ S. CLAYTON,¶ C. N. DAHM,** J. FOLLSTAD SHAH,** D. L. GALAT,†† S. G. LOSS,‡‡ P. GOODWIN,¶ D.D. HART,§ B. HASSETT,* R. JENKINSON,§§ G.M. KONDOLF,¶¶ R. LAVE,¶¶ J.L. MEYER,*** T.K. O’DONNELL,†† L. PAGANO¶¶ and E. SUDDUTH*** * Department of Entomology, University of(More)
Southeastern Australia is presently experiencing one of the worst droughts observed in the region in the last 200 years. The consequences of drought have been far reaching both for human consumptive uses and for aquatic ecosystems, and serve to highlight several important aspects of the nature of droughts, their ecological impacts, and how humans respond to(More)
disturbances varying in strength, frequency, predictability, duration, and spatial scale. Such disturbances can deplete the biota, disrupt ecological processes, and redistribute resources (Giller 1996, Lake 2000). Generally, in both lakes and rivers, recovery from the effects of natural disturbance is relatively rapid, although there are exceptions, such as(More)
Evaluations of the potential distribution of invasive species can increase the efficiency of their management by focusing prevention measures. Generally, ecological models are built using occurrence data from a species' native range to predict the distribution in areas that the species may invade. However, historical and geographical constraints can limit a(More)
Habitat structure has pervasive effects on community composition and diversity, with physically complex habitats often containing more species than physically simple ones. What factors or mechanism drive this pattern is little understood, but a complicating problem is that different sources of habitat structure can be confounded in both surveys and(More)
Biological invasions are regarded as a major threat to native ecosystems, yet studies investigating the interactions of invaders with native biota under field conditions are rare. Whilst many invaders are present only in low densities, it is often the effects of high densities that are of particular concern. We manipulated densities of the invading New(More)
Schoenly and Reid (1987) analyzed eleven sets of data on the temporal changes in arthropod community composition on carcasses to ascertain whether invertebrate succession on carrion proceeded " . . . as a sequence of discrete faunal seres, or as a continuum of gradual changes . . . " (Schoenly and Reid 1987:193). Parenthetically, we consider that the term(More)