Jon M Vallazza (Former Employee)
Science and Products
Filter Total Items: 28
Relationships between land cover and dissolved organic matter change along the river to lake transition Relationships between land cover and dissolved organic matter change along the river to lake transition
Dissolved organic matter (DOM) influences the physical, chemical, and biological properties of aquatic ecosystems. We hypothesized that controls over spatial variation in DOM quantity and composition (measured with DOM optical properties) differ based on the source of DOM to aquatic ecosystems. DOM quantity and composition should be better predicted by land cover in aquatic habitats with
Authors
James H. Larson, Paul C. Frost, Marguerite A. Xenopoulos, Clayton J. Williams, Ana M. Morales-Williams, Jonathan M. Vallazza, J. C. Nelson, William B. Richardson
Fatty acid composition at the base of aquatic food webs is influenced by habitat type and watershed land use Fatty acid composition at the base of aquatic food webs is influenced by habitat type and watershed land use
Spatial variation in food resources strongly influences many aspects of aquatic consumer ecology. Although large-scale controls over spatial variation in many aspects of food resources are well known, others have received little study. Here we investigated variation in the fatty acid (FA) composition of seston and primary consumers within (i.e., among habitats) and among tributary...
Authors
James H. Larson, William B. Richardson, Brent C. Knights, Lynn Bartsch, Michelle Bartsch, J. C. Nelson, Jason A. Veldboom, Jonathan M. Vallazza
Rivermouth alteration of agricultural impacts on consumer tissue δ15N Rivermouth alteration of agricultural impacts on consumer tissue δ15N
Terrestrial agricultural activities strongly influence riverine nitrogen (N) dynamics, which is reflected in the δ15N of riverine consumer tissues. However, processes within aquatic ecosystems also influence consumer tissue δ15N. As aquatic processes become more important terrestrial inputs may become a weaker predictor of consumer tissue δ15N. In a previous study, this terrestrial...
Authors
James H. Larson, William B. Richardson, Jonathan M. Vallazza, J. C. Nelson
An exploratory investigation of the landscape-lake interface: Land cover controls over consumer N and C isotopic composition in Lake Michigan rivermouths An exploratory investigation of the landscape-lake interface: Land cover controls over consumer N and C isotopic composition in Lake Michigan rivermouths
Rivermouth ecosystems are areas where tributary waters mix with lentic near-shore waters and provide habitat for many Laurentian Great Lakes fish and wildlife species. Rivermouths are the interface between terrestrial activities that influence rivers and the ecologically important nearshore. Stable isotopes of nitrogen (N) and carbon (C) in consumers were measured from a range of...
Authors
James H. Larson, William B. Richardson, Jonathan M. Vallazza, J. C. Nelson
Science and Products
Filter Total Items: 28
Relationships between land cover and dissolved organic matter change along the river to lake transition Relationships between land cover and dissolved organic matter change along the river to lake transition
Dissolved organic matter (DOM) influences the physical, chemical, and biological properties of aquatic ecosystems. We hypothesized that controls over spatial variation in DOM quantity and composition (measured with DOM optical properties) differ based on the source of DOM to aquatic ecosystems. DOM quantity and composition should be better predicted by land cover in aquatic habitats with
Authors
James H. Larson, Paul C. Frost, Marguerite A. Xenopoulos, Clayton J. Williams, Ana M. Morales-Williams, Jonathan M. Vallazza, J. C. Nelson, William B. Richardson
Fatty acid composition at the base of aquatic food webs is influenced by habitat type and watershed land use Fatty acid composition at the base of aquatic food webs is influenced by habitat type and watershed land use
Spatial variation in food resources strongly influences many aspects of aquatic consumer ecology. Although large-scale controls over spatial variation in many aspects of food resources are well known, others have received little study. Here we investigated variation in the fatty acid (FA) composition of seston and primary consumers within (i.e., among habitats) and among tributary...
Authors
James H. Larson, William B. Richardson, Brent C. Knights, Lynn Bartsch, Michelle Bartsch, J. C. Nelson, Jason A. Veldboom, Jonathan M. Vallazza
Rivermouth alteration of agricultural impacts on consumer tissue δ15N Rivermouth alteration of agricultural impacts on consumer tissue δ15N
Terrestrial agricultural activities strongly influence riverine nitrogen (N) dynamics, which is reflected in the δ15N of riverine consumer tissues. However, processes within aquatic ecosystems also influence consumer tissue δ15N. As aquatic processes become more important terrestrial inputs may become a weaker predictor of consumer tissue δ15N. In a previous study, this terrestrial...
Authors
James H. Larson, William B. Richardson, Jonathan M. Vallazza, J. C. Nelson
An exploratory investigation of the landscape-lake interface: Land cover controls over consumer N and C isotopic composition in Lake Michigan rivermouths An exploratory investigation of the landscape-lake interface: Land cover controls over consumer N and C isotopic composition in Lake Michigan rivermouths
Rivermouth ecosystems are areas where tributary waters mix with lentic near-shore waters and provide habitat for many Laurentian Great Lakes fish and wildlife species. Rivermouths are the interface between terrestrial activities that influence rivers and the ecologically important nearshore. Stable isotopes of nitrogen (N) and carbon (C) in consumers were measured from a range of...
Authors
James H. Larson, William B. Richardson, Jonathan M. Vallazza, J. C. Nelson