Results 91 to 100 of about 106,242 (267)

Global field trials show the advantages of beta regression compared with logit transformation and quasi‐likelihood for the analysis of percentage plant disease severity

Annals of Applied Biology, EarlyView.
Disease severity in crop protection field trials is commonly assessed as a proportion represented as a percentage. Traditional statistical analysis uses transformation to logit or angle. This study compares analyses based on the beta distribution and the quasi‐likelihood method with the logit transform using a large global data set of field trials ...
Boby Mathew, Peter D. Lancashire, Marc J. M. Rutten   +2 more
wiley   +1 more source

Mexico City and the biogeochemistry of global urbanization [PDF]

, 2000
Mexico City is far advanced in its urban evolution, and cities in currently developing nations may soon follow a similar course. This paper investigates the strengths and weaknesses of infrastructures for the emerging megacities.
Blake, DR, Bossert, JE, Chow, J, Colina, JA, Dubey, MK, Duce, RA, Edgerton, S, Elliott, S, Gaffney, J, Gupta, M, Guzman, F, Matson, PA, McNair, LA, Ortiz, E, Riley, W, Rowland, FS, Ruiz, ME, Russell, AG, Simpson, IJ, Smith, FA, Sosa, G, Streit, G, Watson, J   +22 more
core  

Fecal Steroids as Tracers of Human Population and Waste Management Practices at the Ancient Maya City of Ucanal, Guatemala

Archaeometry, EarlyView.
ABSTRACT Geochemical data compiled from dried sediments from three water reservoirs at the ancient Maya city of Ucanal, Petén, Guatemala, reveal low to undetectable fecal biomarker concentrations. These low concentrations may be the result of the aerobic decay of sterols combined with well‐managed waste disposal practices.
Jean D. Tremblay, Peter M. J. Douglas, Christina T. Halperin, Yves Gélinas   +3 more
wiley   +1 more source

An index to characterize the spatial distribution of land use within watersheds and implications for river network nutrient removal and export [PDF]

, 2015
The spatial distribution of land use and associated nutrient inputs may influence the efficacy of in-stream nutrient removal; however, the effect of source location on N removal and watershed N export has not been quantified.
Mineau, Madeleine M., Stewart, Robert J., Wollheim, Wilfred M.   +2 more
core   +2 more sources

From rhetoric to measurement: The economics of wetland conservation

Canadian Journal of Agricultural Economics/Revue canadienne d'agroeconomie, EarlyView.
Abstract Wetland conservation continues to be a pressing issue as wetlands continue to be lost due to urban, industrial, and agricultural expansion. This paper synthesizes the current knowledge about wetland conservation economics in Canada, with a focus on prairie landscapes. We review the methods economists use to empirically measure the costs (i.e.,
Patrick Lloyd‐Smith, Peter Boxall, Ken Belcher   +2 more
wiley   +1 more source

How much sampling is enough? Four decades of understorey bird mist‐netting across Amazonia define the minimum effort to uncover species assemblage structure

Ibis, EarlyView.
Mist‐net sampling comprises a key methodological component of assemblage‐wide avifaunal studies, particularly in the understorey of closed‐canopy tropical forests. To investigate mist‐net bird captures and species assemblage structure, we compiled data from 312 sites across the Pan‐Amazon.
Pilar L. Maia‐Braga, Anderson S. Bueno, Richard G. Davies, Marina F. A. Maximiano, Torbjørn Haugaasen, Marina Anciães, John G. Blake, Bette A. Loiselle, Sergio H. Borges, Juliana Menger, Sidnei Dantas, Ramiro D. Melinski, Fernando H. T. de Abreu, Roberta L. Boss, Carlos A. Peres   +14 more
wiley   +1 more source

Viruses in aquatic ecosystems: important advancements of the last 20 years and prospects for the future in the field of microbial oceanography and limnology

Advances in Oceanography and Limnology, 2010
Over the last two decades, viruses in aquatic systems have been observed to modify, influence and control aquatic systems. Since the determination decades ago that viruses were abundant in aquatic ecosystems, researchers have demonstrated that viruses ...
Stéphan Jacquet, Takeshi Miki, Rachel Noble, Peter Peduzzi, Steven Wilhelm   +4 more
doaj   +1 more source

Drelów, the 13th and latest meteorite fall in Poland—A typical L6 chondrite with shock veins

Meteoritics &Planetary Science, EarlyView.
Abstract On Tuesday, February 18, 2025, at 18:04:14 local time, residents of Poland observed a bright fireball registered by many Polish fireball stations belonging to the Skytinel Network established a few months before by Mateusz Żmija. Thus, the meteoroid's orbit, atmospheric trajectory, and the strewn field were calculated, and over 70 fragments ...
Addi Bischoff, Krzysztof Szopa, Jean‐Alix Barrat, Stig Bartel, Jasper Berndt, Tommaso Di Rocco, Dieter Heinlein, Stephan Klemme, Tomasz Krzykawski, Björn Lehnert, Agnieszka Mirek, Andreas Pack, Markus Patzek, Marie Pichotta, Maximilian P. Reitze, Stefan Ruchti, Philippe Schmitt‐Kopplin, Karl Wimmer, Mateusz Żmija   +18 more
wiley   +1 more source

Biogeochemistry of stable carbon isotopes [PDF]

Biochemistry and geochemistry of stable carbon ...
Degens, E. T.
core   +1 more source

Solving the woolly mammoth conundrum: amino acid 15N-enrichment suggests a distinct forage or habitat [PDF]

, 2015
Understanding woolly mammoth ecology is key to understanding Pleistocene community dynamics and evaluating the roles of human hunting and climate change in late Quaternary megafaunal extinctions. Previous isotopic studies of mammoths’ diet and physiology
Longstaffe, Fred J, Metcalfe, Jessica Z, Schwartz-Narbonne, Rachel, Zazula, Grant   +3 more
core   +2 more sources