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Articles by Albert Ruhi
Temporal community change in stream ecosystems varies by assemblage across US climates
1 INTRODUCTION Ecological communities and their properties (e.g. species richness, biomass) are temporally dynamic. Temporal variability tends to decrease with increasing spatial scales (e.g. local to regional) and with increasing levels of biological organization (e.g. population to community and ecosystem level) (Gonzalez et al., 2020; Kéfi et al., 2019; Tilman, 1996).
Spectral signatures of flow regime alteration by dams across the United States
Abstract River scientists strive to understand how streamflow regimes vary across space and time because it is fundamental to predicting the impacts of climate change and human activities on riverine ecosystems. Here we tested whether flow periodicity differs between rivers that are regulated or unregulated by large dams, and whether dominant periodicities change over time in response to dam regulation.
Food web efficiency in desert streams
Top-down influence on food web efficiency We assessed the hypothesis that top predators induce consistent and predictable responses at lower trophic levels (Hairston et al. 1960). We did not observe a relationship between variation in top trophic position and food web efficiency across sites, a result consistent with studies finding that strong top-down effects of predators are uncommon or co-mediated by other factors (Power 1992).
Dams and Climate Interact to Alter River Flow Regimes Across the United States
Abstract Storing and managing river flows through reservoirs could dampen or increase climate‐induced fluctuations in streamflow, but interactions between the effects of dams and climate are poorly understood. Here, we examined how dam properties control different facets of flow alteration across the coterminous United States (CONUS), and compared alteration trends between dam‐affected and reference stream gages.
Linkages between flow regime, biota, and ecosystem processes: Implications for river restoration
River restoration guided by research Human activities have altered the flow regimes of many of Earth's rivers, with negative impacts on biodiversity, water quality, and ecological processes. In a Review, Palmer and Ruhi explain how restoration designs now attempt to mimic ecologically important aspects of natural flow regimes, guided by insights into how variations in flow affect biota and ecosystem processes.
Linkages between flow regime, biota, and ecosystem processes: Implications for river restoration
River restoration guided by research Human activities have altered the flow regimes of many of Earth's rivers, with negative impacts on biodiversity, water quality, and ecological processes. In a Review, Palmer and Ruhi explain how restoration designs now attempt to mimic ecologically important aspects of natural flow regimes, guided by insights into how variations in flow affect biota and ecosystem processes.
Response to Comment on “Designing river flows to improve food security futures in the Lower Mekong Basin”
Abstract Williams et al. claim that the data used in Sabo et al. were improperly scaled to account for fishing effort, thereby invalidating the analysis. Here, we reanalyze the data rescaled per Williams et al. and following the methods in Sabo et al. Our original conclusions are robust to rescaling, thereby invalidating the assertion that our original analysis is invalid. Williams et al.
Measuring Earth's rivers
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Tracking the pulse of the Earth’s fresh waters
Reliable accounting of freshwater resources is key to managing hydrologic risk and balancing freshwater allocations for ecosystems and society. However, recent claims have argued that the global hydrometric network is not keeping pace with monitoring needs. Here we examine this question globally and reveal that over the past four decades the number of streamgaging stations reporting to global, open datasets has been declining.
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