David A. Beauchamp, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 65
Effects of prey abundance, distribution, visual contrast and morphology on selection by a pelagic piscivore Effects of prey abundance, distribution, visual contrast and morphology on selection by a pelagic piscivore
Most predators eat only a subset of possible prey. However, studies evaluating diet selection rarely measure prey availability in a manner that accounts for temporal–spatial overlap with predators, the sensory mechanisms employed to detect prey, and constraints on prey capture.We evaluated the diet selection of cutthroat trout (Oncorhynchus clarkii) feeding on a diverse planktivore...
Authors
Adam G. Hansen, David A. Beauchamp
Latitudinal and photic effects on diel foraging and predation risk in freshwater pelagic ecosystems Latitudinal and photic effects on diel foraging and predation risk in freshwater pelagic ecosystems
1. Clark & Levy (American Naturalist, 131, 1988, 271–290) described an antipredation window for smaller planktivorous fish during crepuscular periods when light permits feeding on zooplankton, but limits visual detection by piscivores. Yet, how the window is influenced by the interaction between light regime, turbidity and cloud cover over a broad latitudinal gradi- ent remains...
Authors
Adam G. Hansen, David A. Beauchamp
Size-selective mortality of steelhead during freshwater and marine life stages related to freshwater growth in the Skagit River, Washington Size-selective mortality of steelhead during freshwater and marine life stages related to freshwater growth in the Skagit River, Washington
We evaluated freshwater growth and survival from juvenile (ages 0–3) to smolt (ages 1–5) and adult stages in wild steelhead Oncorhynchus mykiss sampled in different precipitation zones of the Skagit River basin, Washington. Our objectives were to determine whether significant size-selective mortality (SSM) in steelhead could be detected between early and later freshwater stages and...
Authors
Jamie N. Thompson, David A. Beauchamp
Modeling prey consumption by native and non-native piscivorous fishes: implications for competition and impacts on shared prey in an ultraoligotrophic lake in Patagonia Modeling prey consumption by native and non-native piscivorous fishes: implications for competition and impacts on shared prey in an ultraoligotrophic lake in Patagonia
We examined trophic interactions of the nonnative salmonids Rainbow Trout Oncorhynchus mykiss, Brown Trout Salmo trutta, and Brook Trout Salvelinus fontinalisand the main native predator Creole Perch Percichthys trucha in Lake Nahuel Huapi (Patagonia, Argentina) to determine the relative impact of each predator on their forage base and to evaluate the potential vulnerability of each...
Authors
Romina Juncos, David A. Beauchamp, Pablo H. Viglianoc
Development and evaluation of a bioenergetics model for bull trout Development and evaluation of a bioenergetics model for bull trout
We conducted laboratory experiments to parameterize a bioenergetics model for wild Bull Trout Salvelinus confluentus, estimating the effects of body mass (12–1,117 g) and temperature (3–20°C) on maximum consumption (C max) and standard metabolic rates. The temperature associated with the highest C max was 16°C, and C max showed the characteristic dome-shaped temperature-dependent...
Authors
Matthew G. Mesa, Lisa K. Welland, Helena E. Christiansen, Sally T. Sauter, David A. Beauchamp
Low-level copper exposures increase visibility and vulnerability of juvenile coho salmon to cutthroat trout predators Low-level copper exposures increase visibility and vulnerability of juvenile coho salmon to cutthroat trout predators
Copper contamination in surface waters is common in watersheds with mining activities or agricultural, industrial, commercial, and residential human land uses. This widespread pollutant is neurotoxic to the chemosensory systems of fish and other aquatic species. Among Pacific salmonids (Oncorhynchus spp.), copper-induced olfactory impairment has previously been shown to disrupt behaviors...
Authors
Jenifer K. McIntyre, David H. Baldwin, David A. Beauchamp, Nathaniel L. Scholz
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 65
Effects of prey abundance, distribution, visual contrast and morphology on selection by a pelagic piscivore Effects of prey abundance, distribution, visual contrast and morphology on selection by a pelagic piscivore
Most predators eat only a subset of possible prey. However, studies evaluating diet selection rarely measure prey availability in a manner that accounts for temporal–spatial overlap with predators, the sensory mechanisms employed to detect prey, and constraints on prey capture.We evaluated the diet selection of cutthroat trout (Oncorhynchus clarkii) feeding on a diverse planktivore...
Authors
Adam G. Hansen, David A. Beauchamp
Latitudinal and photic effects on diel foraging and predation risk in freshwater pelagic ecosystems Latitudinal and photic effects on diel foraging and predation risk in freshwater pelagic ecosystems
1. Clark & Levy (American Naturalist, 131, 1988, 271–290) described an antipredation window for smaller planktivorous fish during crepuscular periods when light permits feeding on zooplankton, but limits visual detection by piscivores. Yet, how the window is influenced by the interaction between light regime, turbidity and cloud cover over a broad latitudinal gradi- ent remains...
Authors
Adam G. Hansen, David A. Beauchamp
Size-selective mortality of steelhead during freshwater and marine life stages related to freshwater growth in the Skagit River, Washington Size-selective mortality of steelhead during freshwater and marine life stages related to freshwater growth in the Skagit River, Washington
We evaluated freshwater growth and survival from juvenile (ages 0–3) to smolt (ages 1–5) and adult stages in wild steelhead Oncorhynchus mykiss sampled in different precipitation zones of the Skagit River basin, Washington. Our objectives were to determine whether significant size-selective mortality (SSM) in steelhead could be detected between early and later freshwater stages and...
Authors
Jamie N. Thompson, David A. Beauchamp
Modeling prey consumption by native and non-native piscivorous fishes: implications for competition and impacts on shared prey in an ultraoligotrophic lake in Patagonia Modeling prey consumption by native and non-native piscivorous fishes: implications for competition and impacts on shared prey in an ultraoligotrophic lake in Patagonia
We examined trophic interactions of the nonnative salmonids Rainbow Trout Oncorhynchus mykiss, Brown Trout Salmo trutta, and Brook Trout Salvelinus fontinalisand the main native predator Creole Perch Percichthys trucha in Lake Nahuel Huapi (Patagonia, Argentina) to determine the relative impact of each predator on their forage base and to evaluate the potential vulnerability of each...
Authors
Romina Juncos, David A. Beauchamp, Pablo H. Viglianoc
Development and evaluation of a bioenergetics model for bull trout Development and evaluation of a bioenergetics model for bull trout
We conducted laboratory experiments to parameterize a bioenergetics model for wild Bull Trout Salvelinus confluentus, estimating the effects of body mass (12–1,117 g) and temperature (3–20°C) on maximum consumption (C max) and standard metabolic rates. The temperature associated with the highest C max was 16°C, and C max showed the characteristic dome-shaped temperature-dependent...
Authors
Matthew G. Mesa, Lisa K. Welland, Helena E. Christiansen, Sally T. Sauter, David A. Beauchamp
Low-level copper exposures increase visibility and vulnerability of juvenile coho salmon to cutthroat trout predators Low-level copper exposures increase visibility and vulnerability of juvenile coho salmon to cutthroat trout predators
Copper contamination in surface waters is common in watersheds with mining activities or agricultural, industrial, commercial, and residential human land uses. This widespread pollutant is neurotoxic to the chemosensory systems of fish and other aquatic species. Among Pacific salmonids (Oncorhynchus spp.), copper-induced olfactory impairment has previously been shown to disrupt behaviors...
Authors
Jenifer K. McIntyre, David H. Baldwin, David A. Beauchamp, Nathaniel L. Scholz
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.