His scientific interests lie mostly in Ecology, Feather, Groundwater, Isoscapes and Hydrology. His work carried out in the field of Ecology brings together such families of science as Environmental chemistry, δ13C and Isotopes of oxygen. His studies in Feather integrate themes in fields like Wildlife, Setophaga and Taiga.
He has included themes like Salinity, Nitrate and Nitrification in his Groundwater study. His studies deal with areas such as Animal migration, Oxygen-18 and δ18O as well as Isoscapes. His Hydrology study combines topics in areas such as Dissolved organic carbon, Prairie lake and Seasonality.
His primary areas of investigation include Ecology, Environmental chemistry, Hydrology, δ18O and Aquifer. His Ecology research incorporates elements of Isoscapes and δ13C, δ15N. The various areas that he examines in his Environmental chemistry study include Isotopes of carbon, Effluent, Isotope analysis, Isotopes of oxygen and Isotope fractionation.
While the research belongs to areas of Hydrology, Leonard I. Wassenaar spends his time largely on the problem of Nitrate, intersecting his research to questions surrounding Denitrification and Manure. His study in δ18O is interdisciplinary in nature, drawing from both Fractionation, Nutrient and Analytical chemistry. His Aquifer research is multidisciplinary, incorporating perspectives in Geochemistry, Pore water pressure, Dissolved organic carbon and Geomorphology.
Ecology, δ18O, Environmental chemistry, Hydrology and Analytical chemistry are his primary areas of study. When carried out as part of a general Ecology research project, his work on Range, Overwintering and Feather is frequently linked to work in Ophryocystis elektroscirrha, therefore connecting diverse disciplines of study. His δ18O research incorporates themes from Isoscapes, Atmospheric circulation, Northern Hemisphere, Atmospheric sciences and Southern Hemisphere.
The concepts of his Environmental chemistry study are interwoven with issues in Isotopes of nitrogen, Isotope fractionation, Isotope analysis, δ15N and Isotopes of oxygen. Leonard I. Wassenaar interconnects Fertilizer and Manure in the investigation of issues within Hydrology. His work in the fields of Isotope-ratio mass spectrometry, Mass spectrometry and Laser spectrometry overlaps with other areas such as Materials science and Spectrometer.
His main research concerns Hydrology, Ecology, Analytical chemistry, Overwintering and Laser spectrometry. His Hydrology study frequently draws connections between related disciplines such as δ18O. His Ecology research includes elements of Zoology, Hydrogen isotope and Infection prevalence.
In general Analytical chemistry study, his work on Isotope-ratio mass spectrometry and Mass spectrometry often relates to the realm of Ambient water, thereby connecting several areas of interest. His Overwintering research is multidisciplinary, incorporating elements of Range and Annual cycle. His Laser spectrometry study incorporates themes from Vadose zone, Gravimetric analysis and Mineralogy.
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Global application of stable hydrogen and oxygen isotopes to wildlife forensics.
Gabriel J. Bowen;Leonard I. Wassenaar;Keith A. Hobson.
Linking breeding and wintering grounds of neotropical migrant songbirds using stable hydrogen isotopic analysis of feathers.
K. A. Hobson;Leonard I. Wassenaar.
Comparative equilibration and online technique for determination of non-exchangeable hydrogen of keratins for use in animal migration studies.
L. I. Wassenaar;K. A. Hobson.
Isotopes in Environmental and Health Studies (2003)
Evaluation of the origin and fate of nitrate in the Abbotsford Aquifer using the isotopes of15N and18O in NO3
Leonard I. Wassenaar.
Applied Geochemistry (1995)
High-Precision Laser Spectroscopy D/H and 18O/16O Measurements of Microliter Natural Water Samples
GP Lis;LI Wassenaar;MJ Hendry.
Analytical Chemistry (2008)
AQUIFER VULNERABILITY INDEX: A GIS - COMPATIBLE METHOD FOR GROUNDWATER VULNERABILITY MAPPING
Dale Van Stempvoort;Lee Ewert;Leonard Wassenaar.
Canadian Water Resources Journal (1993)
Tracking animal migration with stable isotopes
Keith A. Hobson;Leonard I. Wassenaar.
Natal origins of migratory monarch butterflies at wintering colonies in Mexico: New isotopic evidence
Leonard I. Wassenaar;Keith A. Hobson.
Proceedings of the National Academy of Sciences of the United States of America (1998)
Individual specialization and trophic adaptability of northern pike ( Esox lucius ): an isotope and dietary analysis
Catherine P. Beaudoin;William M. Tonn;Ellie E. Prepas;Leonard I. Wassenaar.
Effects of lipid extraction on stable carbon and nitrogen isotope analyses of fish tissues: potential consequences for food web studies
M. A. Sotiropoulos;W. M. Tonn;L. I. Wassenaar.
Ecology of Freshwater Fish (2004)
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