A5057655804- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Aquatic Ecosystems and Phytoplankton Dynamics
- Freshwater macroinvertebrate diversity and ecology
- Physiological and biochemical adaptations
- Aquatic Invertebrate Ecology and Behavior
- Isotope Analysis in Ecology
- Hydrology and Watershed Management Studies
- Species Distribution and Climate Change
- Fish biology, ecology, and behavior
- Aquaculture Nutrition and Growth
- Marine and coastal ecosystems
- Environmental Toxicology and Ecotoxicology
- Fish Biology and Ecology Studies
- Ecology and Vegetation Dynamics Studies
- Animal Ecology and Behavior Studies
- Soil erosion and sediment transport
- Marine animal studies overview
- Environmental DNA in Biodiversity Studies
- Water Quality Monitoring Technologies
- Marine and fisheries research
- Diet and metabolism studies
- Marine Biology and Environmental Chemistry
- Ultrasonics and Acoustic Wave Propagation
- Atmospheric chemistry and aerosols
Meridian Community College
2025
The Ohio State University
2016-2024
University of Minnesota
2003-2021
John Wiley & Sons (United States)
2020
Ecological Society of America
2020
Montana State University
2012-2017
University of Oslo
2010
Miami University
2002-2005
Abstract Biological stoichiometry provides a mechanistic theory linking cellular and biochemical features of co‐evolving biota with constraints imposed by ecosystem energy nutrient inputs. Thus, understanding variation in biomass carbon : nitrogen phosphorus (C N P) is major priority for integrative biology. Among various factors affecting organism stoichiometry, differences C P have been hypothesized to reflect organismal P‐content because altered allocation P‐rich ribosomal RNA at...
Homeostasis of element composition is one the central concepts ecological stoichiometry. In this context, homeostasis resistance to change consumer body in response chemical consumer's food. To simplify theoretical analysis, it has generally been assumed that autotrophs exhibit flexibility their composition, while heterotrophs are confined a constant (strictly homeostatic) composition. Yet, recent studies suggest not universally strictly homeostatic. We examined degree which and regulate...
Rates of biogeochemical processes often vary widely in space and time, characterizing this variation is critical for understanding ecosystem functioning. In streams, spatial hotspots nutrient transformations are generally attributed to physical microbial processes. Here we examine the potential heterogeneous distributions fish generate recycling. We measured nitrogen (N) phosphorus (P) excretion rates 47 species an N-limited Neotropical stream, combined these data with population densities...
The classical Redfield ratio of carbon106 : nitrogen16 phosphorus1 is a cornerstone biogeochemistry. With the use >2,000 observations chemistry particulate matter from small and large lakes, as well near off‐shore marine environments, we found that best model to describe seston stoichiometry depended on scale analysis. We also there were better estimates for than all habitats, whether freshwater or marine. Across entire data set, constant proportionality C 166 :N 20 P 1 (±error) described...
Ecological stoichiometry offers a framework for predicting how animal species vary in recycling nutrients, thus providing mechanism identity mediates ecosystem processes. Here we show that variation the rates and ratios at which 28 vertebrate (fish, amphibians) recycled nitrogen (N) phosphorus (P) tropical stream supports theory. Mass‐specific P excretion rate varied 10‐fold among taxa was negatively related to body content. In addition, N : ratio excreted P. Body mass (negatively rates)...
Abstract Understanding and predicting how global warming affects the structure functioning of natural ecosystems is a key challenge 21st century. Isolated laboratory field experiments testing change hypotheses have been criticized for being too small‐scale overly simplistic, whereas surveys are inferential often confound temperature with other drivers. Research that utilizes thermal gradients offers more promising approach geothermal in particular, which span range temperatures within single...
Ecologists have long been interested in understanding the strengths of consumer and resource limitation influencing communities. Here we ask three questions concerning relative importance nutrients grazing fishes to primary producers a tropical Andean stream: (1) Are stream algae nutrient limited? (2) top-down bottom-up forces dual limiting producers? (3) Do modulate degree limitation? We obtained several lines evidence suggesting that are nitrogen limited. Addition flow-through channels...
The elemental composition of solutes transported by rivers reflects combined influences surrounding watersheds and transformations within stream networks, yet comparatively little is known about downstream changes in effects watershed loading vs. in-channel processes. In the forested a river under mediterranean hydrologic regime, we examined influence longitudinal environmental conditions on water-column nutrient during summer base flow across network sites ranging from strongly...
Abstract Although much effort has been devoted to quantifying how warming alters carbon cycling across diverse ecosystems, less is known about these changes are linked the of bioavailable nitrogen and phosphorus. In freshwater benthic biofilms (i.e. thin films algae, bacteria, fungi, detrital matter) act as biogeochemical hotspots by controlling important fluxes energy material. Understanding respond thus critical for predicting responses coupled elemental cycles in systems. We developed...
1. Nutrient spiralling provides a conceptual framework and whole-system approach to investigate ecosystem responses environmental changes. We use metrics examine how the coupling of nitrogen phosphorus uptake varies between streams dominated by either heterotrophic (i.e. bacteria-dominated) or autotrophic (algal-dominated) microbial communities. 2. Algae generally exhibit greater capacity store nutrients than bacteria because differences in cellular structures. These led us hypothesise that...
Variation in resource supply can cause variation temperature dependences of metabolic processes (e.g., photosynthesis and respiration). Understanding such divergence is particularly important when using theory to predict ecosystem responses climate warming. Few studies, however, have assessed the effect temperature-resource interactions on processes, cases where limiting resources exhibits dependence. We investigated biomass accrual, gross primary production (GPP), community respiration...
Imbalances in phosphorus (P) intake relative to demand negatively affect animal growth, but their consequences are less understood for vertebrates, which bone represents a significant and potentially flexible pool of P. Flexibility body‐P content could buffer vertebrates from the effects imbalances between P demand, reducing likelihood sharp stoichiometric “knife‐edge” relationship growth rate diet‐P level. We conducted meta‐analysis published aquaculture experiments that tested diet %P on...
Abstract Climate warming is affecting the structure and function of river ecosystems, including their role in transforming transporting carbon (C), nitrogen (N), phosphorus (P). Predicting how ecosystems respond to has been hindered by a dearth information about otherwise well‐studied physiological responses temperature scale from organismal ecosystem levels. We conducted an ecosystem‐level manipulation quantify coupling stream metabolism nutrient uptake responded realistic scenario. A...
How ecological communities respond to predicted increases in temperature will determine the extent which Earth's biodiversity and ecosystem functioning can be maintained into a warmer future. Warming is alter structure of natural communities, but robust tests such predictions require appropriate large-scale manipulations intact, habitat that open dispersal processes via exchange with regional species pools. Here, we report results two-year whole-stream warming experiment shifted invertebrate...
Animals can be important in modulating ecosystem-level nutrient cycling, although their importance varies greatly among species and ecosystems. Nutrient cycling rates of individual animals represent valuable data for testing the predictions frameworks such as Metabolic Theory Ecology (MTE) ecological stoichiometry (ES). They also an set functional traits that may reflect both environmental phylogenetic influences. Over past two decades, studies animal-mediated have increased dramatically,...
Women are typically more prone to knee injuries than men, possibly due poorer hamstrings-to-quadriceps ratio (HTQ), particularly during fast velocity movements. Men would have greater HTQ across women. Cross-sectional study. 2. Ultrasound images quantified quadriceps and hamstrings muscle cross-sectional area (CSA) in 27 study participants (14 women, age, 24 ± 4 years; 13 25 6 years). Peak torque (PT) was taken from maximal voluntary isometric contractions (MVICs) isokinetic leg extension...
Animals commonly experience spatial and temporal variation in resource quality, thus experiencing temporally variable diets. Methods for scaling up growth component patches to long‐term across heterogeneity are seldom explicitly considered. Long‐term is sometimes considered be a weighted average of rates on diets (growth integration). However, if animals integrate resources high‐ low‐quality diets, their may greater than predicted from diet‐specific (resource We measured biomass seven...
A central question at the interface of food-web and climate change research is how secondary production, or formation heterotroph biomass over time, will respond to rising temperatures. The metabolic theory ecology (MTE) hypothesizes temperature-invariance driven by matched opposed forces that reduce heterotrophs while increasing their turnover rate (production : biomass, P:B) with warming. To test this prediction whole community level, we used a geothermal heat exchanger experimentally warm...