Results 41 to 50 of about 107,478 (303)

Diet of bird‐like troodontid dinosaurs: synthesis of a contentious clade

Biological Reviews, EarlyView.
ABSTRACT Troodontidae is a clade of small‐to medium‐sized maniraptoran theropods that mainly lived in Laurasia (modern Asia, North America and Europe) during the Jurassic and Cretaceous periods and are believed to have had a variety of diets. The uniqueness of troodontid teeth suggests that they diverged from the typical flesh‐based diet of non‐avian ...
Yui Chi Fan, Case Vincent Miller, Michael Pittman   +2 more
wiley   +1 more source

Biodegradation of MC252 oil in oil:sand aggregates in a coastal headland beach environment

Frontiers in Microbiology, 2014
Biodegradation potential of MC252 in oil:sand aggregates, termed surface residue balls (SRBs), was examined using multiple lines of evidence on a heavily-impacted coastal headland beach in Louisiana, USA.
Vijaikrishnah eElango, Marilany eUrbano, Kendall R Lemelle, John H Pardue   +3 more
doaj   +1 more source

Pathway-Centric Analysis of Microbial Metabolic Potential and Expression Along Nutrient and Energy Gradients in the Western Atlantic Ocean

Frontiers in Marine Science, 2022
Microbial communities play integral roles in driving nutrient and energy transformations in the ocean, collectively contributing to fundamental biogeochemical cycles. Although it is well known that these communities are stratified within the water column,
Maria A. Cavaco, Maya P. Bhatia, Alyse K. Hawley, Monica Torres-Beltrán, Winifred M. Johnson, Krista Longnecker, Kishori Konwar, Elizabeth B. Kujawinski, Steven J. Hallam, Steven J. Hallam, Steven J. Hallam, Steven J. Hallam, Steven J. Hallam   +12 more
doaj   +1 more source

Organic carbon transport and C/N ratio variations in a large tropical river: Godavari as a case study, India [PDF]

, 2005
This study gives an insight into the source of organic carbon and nitrogen in the Godavari river and its tributaries, the yield of organic carbon from the catchment, seasonal variability in their concentration and the ultimate flux of organic and ...
Balakrishna, Keshava, Probst, Jean-Luc
core   +2 more sources

Hot spots or hot moments? Contextualizing the spatio‐temporal scale of research on animal inputs

Ecography, EarlyView.
Mammals play important roles in redistributing elements across ecosystems, concentrating biogeochemical inputs across both space and time. However, research on zoogeochemical inputs is often constrained by logistical considerations, potentially limiting our knowledge of mammals' impacts on biogeochemical patterns and processes.
Kristy M. Ferraro, Elizabeth S. Forbes, Andrew J. Abraham, Julia D. Monk   +3 more
wiley   +1 more source

Yellowstone Wildfires Increased Stream Ion Concentrations and Export

Nitrogen
Wildfires in the western U.S. have increased in severity and duration in recent decades. Severe wildfires can enhance the rates of nutrient mineralization, causing large exports of inorganic nitrogen and other ions from forests to streams.
Isabella G. Sadler, Lusha M. Tronstad, Christine Fisher, Robert O. Hall, Todd M. Koel   +4 more
doaj   +1 more source

Multiple sulfur isotope signatures of sulfite and thiosulfate reduction by the model dissimilatory sulfate-reducer, Desulfovibrio alaskensis str. G20

Frontiers in Microbiology, 2014
Dissimilatory sulfate reduction serves as a key metabolic carbon remineralization process in anoxic marine environments. Sulfate reducing microorganisms can impart a wide range in mass-dependent sulfur isotopic fractionation.
William D. Leavitt, William D. Leavitt, Renata eCummins, Marian L Schmidt, Min Sub eSim, Min Sub eSim, Shuhei eOno, Alexander S. Bradley, David T. Johnston   +8 more
doaj   +1 more source

Seasonal drivers of plant–soil–microbial community structure and functions in Western Himalayan grasslands, Pakistan

Grassland Research, EarlyView.
Plant species richness was greater in summer in both alpine and subalpine grassland ecosystems. Soil moisture demonstrates significant positive correlations with soil organic carbon and total nitrogen across seasonal periods. Microbial α‐diversity peaks during summer but maintains functional stability across seasons.
Huma Ali, Muhammad Rafiq, Allan Degen, Ben Sparrow, Zhanhuan Shang   +4 more
wiley   +1 more source

Simulating Marine Ecosystem Dynamics and Biogeochemical Cycling With Multiple Plankton Functional Types

Journal of Advances in Modeling Earth Systems
Current representations of marine ecosystems in Earth System Models are greatly simplified, neglecting key interactions between dynamic food webs, biogeochemistry, and climate change.
Jun Yu, Kristen M. Krumhardt, J. Keith Moore, Robert T. Letscher, Shanlin Wang, Nicola A. Wiseman, Matthew C. Long, Keith Lindsay, Michael Levy, Colleen M. Petrik, Adam C. Martiny   +10 more
doaj   +1 more source

Mineral Weathering and Podzolization Control Acid Neutralization and Streamwater Chemistry Gradients in Upland Glaciated Catchments, Northeastern United States

Frontiers in Earth Science, 2019
Headwater streams in the White Mountains, NH, United States have been shown to have downstream gradients of increasing pH and concentrations of base cations coupled with decreasing concentrations of aluminum.
Scott W. Bailey, Kevin J. McGuire, Donald S. Ross, Mark B. Green, Olivia L. Fraser   +4 more
doaj   +1 more source