19. Assembly Rules and Novel Assemblages in Aquatic Ecosystems
Published in Biological Invasions in Changing Ecosystems
Rapid and highly variable warming of lake surface waters around the globe
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Published in Geophysical Research Letters
In this first worldwide synthesis of in situ and satellite‐derived lake data, we find that lake summer surface water temperatures rose rapidly (global mean = 0.34°C decade−1) between 1985 and 2009. Our analyses show that surface water warming rates are dependent on combinations of climate and local characteristics, rather than just lake location, l...
Evidence of Landlocked Chinook Salmon Populations in California
Published in North American Journal of Fisheries Management
Natural reproduction of adfluvial Chinook Salmon Oncorhyn-chustshawytscha has been documented in their native and introduced range but not in California, the southern end of their native range. A combination of anecdotal evidence and survey data suggests that successful spawning by Chinook Salmon reared in California reservoirs could be common. The...
Californias agricultural regions gear up to actively manage groundwater use and protection
Published in California Agriculture
New regulations are emerging in response to historic groundwater depletion and widespread groundwater quality degradation in California. They aim at long-term preservation of groundwater resources for use in agriculture, in urban areas and for the support of ecosystems in streams dependent on groundwater. The regulations are driving a historic shif...
The aquatic trophic ecology of Suisun Marsh, San Francisco Estuary, California, during autumn in a wet year
Published in San Francisco Estuary and Watershed Science
Using stable isotopes of carbon (δ13C) and nitrogen (δ15N) and mixing models, we investigated the trophic levels and carbon sources of invertebrates and fishes of a large tidal marsh in the San Francisco Estuary. Our goal was to better understand an estuarine food web comprised of native and alien species. We found the following: (1) the food web w...
Threat evolution: negative feedbacks between management actions and species recovery in threatened trout (Salmonidae)
Published in Reviews in Fish Biology and Fisheries
Resource managers are often presented with dilemmas that require immediate action to avoid species extinction, but that also ensure species long-term persistence. These objectives may conflict with one another, resulting in new threats as initial threats are ameliorated. Such threat evolution is a common pattern in the long history of efforts to co...
Instream flows: new tools to quantify water quality conditions for returning adult Chinook salmon
Published in Journal of Water Resources Planning and Management
This paper examines the effect of implementing a water transaction program to address potential water quality limitations for returning adult fall-run Chinook salmon in a stream system where the agriculture is the dominant land and water use. Water transactions are becoming an increasingly used approach to provide instream flows during periods when...
What If Californias Drought Continues?
California is in the fourth year of a severe, hot droughtthe kind that is increasingly likely as the climate warms. Although no sector has been untouched, impacts so far have varied greatly, reflecting different levels of drought preparedness. Urban areas are in the best shape, thanks to sustained investments in diversified water portfolios and con...
Functional Flows in Modified Riverscapes: Hydrographs, Habitats and Opportunities
Published in BioScience
Building on previous environmental flow discussions and a growing recognition that hydrogeomorphic processes are inherent in the ecological functionality and biodiversity of riverscapes, we propose a functional-flows approach to managing heavily modified rivers. The approach focuses on retaining specific process-based components of the hydrograph, ...
Economic Analysis of the 2015 Drought for California Agriculture
The drought is tightening its grip on California agriculture, squeezing about 30 percent more workers and cropland out of production than in 2014, according to the latest drought impact report by the UC Davis Center for Watershed Sciences. In 2015, the states agricultural economy directly will lose about 1.84 billion and 10,100 jobs because of the ...
