A Randall Hughes

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Understanding the ecological consequences of biodiversity is a fundamental challenge. Research on a key component of biodiversity, genetic diversity, has traditionally focused on its importance in evolutionary processes, but classical studies in evolutionary biology, agronomy and conservation biology indicate that genetic diversity might also have important(More)
Motivated by recent global reductions in biodiversity, empirical and theoretical research suggests that more species-rich systems exhibit enhanced productivity, nutrient cycling, or resistance to disturbance or invasion relative to systems with fewer species. In contrast, few data are available to assess the potential ecosystem-level importance of genetic(More)
Christopher D. G. Harley,* A. Randall Hughes, Kristin M. Hultgren, Benjamin G. Miner, Cascade J. B. Sorte, Carol S. Thornber, Laura F. Rodriguez, Lars Tomanek and Susan L. Williams Bodega Marine Laboratory, University of California-Davis, Bodega Bay, CA 94923, USA Department of Zoology, University of British Columbia, Vancouver, BC, Canada V6T 1Z4(More)
Coastal ecosystems and the services they provide are adversely affected by a wide variety of human activities. In particular, seagrass meadows are negatively affected by impacts accruing from the billion or more people who live within 50 km of them. Seagrass meadows provide important ecosystem services, including an estimated $1.9 trillion per year in the(More)
OBJECTIVE The goal was to explore barriers to palliative care experienced by pediatric health care providers caring for seriously ill children. METHODS This study explored pediatric provider perceptions of end-of-life care in an academic children's hospital, with the goal of describing perceived barriers to end-of-life care for children and their(More)
This article provides an overview of evidence-based practice (EBP). It will discuss the background of EBP and barriers to using it. The state of HIV nursing research evidence, as well as methods to rate that evidence, will be described. Types of data sources will be identified. The article will conclude with selected clinical applications of EBP.
Recent large-scale seagrass declines have prompted experimental investigations of potential mechanisms. Although many studies have implicated eutrophication or reductions of epiphyte grazers in these declines, few experiments have simultaneously manipulated both factors to assess their relative effects. This study used meta-analyses of 35 published seagrass(More)
Integrating how habitat heterogeneity influences food web dynamics is critical to enhance our understanding of community structure. This study quantified resident (invertebrates) and transient (juvenile and piscivorous fish) fauna within restored intertidal oyster reefs and analogous control sites without reef habitat in each of three habitats (on the edge(More)
Exotic species invasions create almost ideal conditions for promoting evolutionary diversification: establishment of allopatric populations in new environmental conditions; altered ecological opportunities for native species; and new opportunities for hybridization between previously allopatric taxa. Here, we review recent studies of the evolutionary(More)
Genetic diversity, like species diversity, can have important consequences for communities and ecosystems. However, little is known about whether the effects of genetic diversity demonstrated in experimental assemblages are of sufficient strength to generate patterns in natural systems. We conducted a survey of eelgrass (Zostera marina) to examine the(More)