Gabriel A. Singer results 26
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Drying Halves Decomposition Rates in River Networks by Decreasing Decomposer DiversityNARA Subscribed
River drying is intensifying worldwide due to climate change and increasing water abstraction, with major consequences for riverine biodiversity and ecosystem functioning. In river networks, drying not only alters local environmental conditions but also disrupts hydrological connectivity, reshaping the movement of organisms and resources at the river network scale. Leaf litter decomposition—a key ecosystem function in freshwat...
Carbon dioxide (CO 2 ) emissions from freshwaters represent a globally important carbon flux. However, CO 2 fluxes from urban waters remain poorly constrained, and challenges remain for reliable upscaling, partly because of the high diversity of urban aquatic ecosystems. Using floating chambers to measure fluxes instantaneously and monitor them over multiple days, we estimated CO 2 emissions at 31 sites (lakes, ponds, rivers a...
Aim The urgency for remote, reliable and scalable biodiversity monitoring amidst mounting human pressures on ecosystems has sparked worldwide interest in Passive Acoustic Monitoring (PAM), which can track life underwater and on land. However, we lack a unified methodology to report this sampling effort and a comprehensive overview of PAM coverage to gauge its potential as a global research and monitoring tool. To address this...
Niche partitioning in a periphyton metacommunity peaks at intermediate species richness in midsized riversNARA Subscribed
The trait‐based partitioning of species plays a critical role in biodiversity–ecosystem function relationships. This niche partitioning drives and depends on community structure, yet this link remains elusive in the context of a metacommunity, where local community assembly is dictated by regional dispersal alongside local environmental conditions. Hence, elucidating the coupling of niche partitioning and community structure n...
Strong large‐scale structure–function coupling in benthic bacteria is mediated by algae in a geodiverse river networkNARA Subscribed
Benthic bacteria in stream ecosystems drive organic matter mineralization. However, knowledge on how this ecosystem function is driven by bacterial community composition in interaction with environmental conditions and organic matter resources is poor. This is especially true when considering the regional scale of river networks, at which environmental conditions vary in a scale‐dependent manner and are spatially structured du...
Green sturgeon ( Acipenser medirostris ) and white sturgeon ( A. transmontanus ) are closely related, sympatric species that inhabit the San Francisco estuary. Green sturgeon have a more marine life history but both species spawn in the Sacramento River and reside for some duration in San Francisco Bay. These sturgeons are of conservation concern, yet little is known about their dietary competition when they overlap in space a...
Reliable biodiversity data are crucial for environmental research and management. Unfortunately, data paucity prevails for many regions and organismal groups such as aquatic invertebrates. High-throughput DNA-based identification, in particular DNA metabarcoding, has accelerated biodiversity data generation. However, in the process of metabarcoding, specimens are usually destroyed, precluding later specimen-based analyses. Met...
Movement patterns of juvenile green sturgeon (Acipenser medirostris) in the San Francisco Bay EstuaryNARA Subscribed
Little is known about the distribution and ecology of juvenile green sturgeon throughout their range and specifically within California’s Central Valley and the San Francisco Bay Estuary. The objective of our study was to identify rearing movement patterns of juvenile green sturgeon and their interaction with Delta and Bay habitats. Acoustic biotelemetry was used to record juvenile movements and residence within different regi...
Methane emissions from contrasting urban freshwaters: Rates, drivers, and a whole‐city footprintNARA Subscribed
Global urbanization trends impose major alterations on surface waters. This includes impacts on ecosystem functioning that can involve feedbacks on climate through changes in rates of greenhouse gas emissions. The combination of high nutrient supply and shallow depth typical of urban freshwaters is particularly conducive to high rates of methane (CH 4 ) production and emission, suggesting a potentially important role in the gl...
Artificial light at night decreases biomass and alters community composition of benthic primary producers in a sub‐alpine streamNARA Subscribed
Artificial light at night (ALAN) is recognized as a contributor to environmental change and a biodiversity threat on a global scale. Despite its widespread use and numerous potential ecological effects, few studies have investigated the impacts on aquatic ecosystems and primary producers. Light is a source of energy and information for benthic autotrophs that form the basis of food webs in clear, shallow waters. Artificial nig...
EPMA-World Congress 2015NARA Subscribed
Rare but active taxa contribute to community dynamics of benthic biofilms in glacier‐fed streamsNARA Subscribed
Summary Glaciers harbour diverse microorganisms, which upon ice melt can be released downstream. In glacier‐fed streams microorganisms can attach to stones or sediments to form benthic biofilms. We used 454‐pyrosequencing to explore the bulk (16 S rDNA ) and putatively active (16 S rRNA ) microbial communities of stone and sediment biofilms across 26 glacier‐fed streams. We found differences in community composition between bu...