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Year Published: 2010

Scale-dependent mechanisms of habitat selection for a migratory passerine: an experimental approach

Habitat selection theory predicts that individuals choose breeding habitats that maximize fitness returns on the basis of indirect environmental cues at multiple spatial scales. We performed a 3-year field experiment to evaluate five alternative hypotheses regarding whether individuals choose breeding territories in heterogeneous landscapes on the...

Donovan, Therese M.; Cornell, Kerri L.

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Year Published: 2010

Effects of cadmium, estradiol-17beta and their interaction on gonadal condition and metamorphosis of male and female African clawed frog, Xenopus laevis

To assess interaction effects between cadmium (Cd, a putative xenoestrogen) and estradiol-17beta (E(2)) on sex differentiation and metamorphosis, Xenopus laevis were exposed to solvent-control (0.005% ethanol), Cd (10microgL(-1)), E(2) (1microgL(-1)), or Cd and E(2) (Cd+E(2)) in FETAX medium from fertilization to 75d postfertilization. Each...

Sharma, Bibek; Patino, Reynaldo
Sharma B. Effects of cadmium, estradiol-17beta and their interaction on gonadal condition and metamorphosis of male and female African clawed frog, Xenopus laevis. Chemosphere (Oxford). 2010-04;79:499-505.

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Year Published: 2010

Fish habitat degradation in U.S. reservoirs

As the median age of the thousands of large reservoirs (> 200 ha) in the United States tops 50, many are showing various signs of fish habitat degradation. Our goal was to identify major factors degrading fish habitat in reservoirs across the country, and to explore regional degradation patterns. An online survey including 14 metrics was scored...

Miranda, Leandro E.; Spickard, M.; Dunn, T.; Webb, K.M.; Aycock, J.N.; Hunt, K.
Miranda L. Fish Habitat Degradation in U.S. Reservoirs. Fisheries (Bethesda). 2010-04;35:175-184.

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Year Published: 2010

Habitat selection and abundance of young-of-year smallmouth bass in north temperate lakes

Habitat use during early life history plays an important role in the ecology of smallmouth bass Micropterus dolomieu in north temperate lakes. The highest levels of mortality occur during the first year of life, and the habitat selected probably affects mortality. We used resource selection functions and abundance data from two northern...

Brown, Peter James; Bozek, Michael A.

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Year Published: 2010

Assessing effects of water abstraction on fish assemblages in Mediterranean streams

1. Water abstraction strongly affects streams in arid and semiarid ecosystems, particularly where there is a Mediterranean climate. Excessive abstraction reduces the availability of water for human uses downstream and impairs the capacity of streams to support native biota. 2. We investigated the flow regime and related variables in six river...

Benejam, Lluis; Angermeier, Paul L.; Munne, Antoni; García-Berthou, Emili

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Year Published: 2010

Evidence of panmixia between sympatric life history forms of coastal cutthroat trout in two lower Columbia River tributaries

Coastal cutthroat trout Oncorhynchus clarkii clarkii exhibit resident and migratory life history strategies that often occur sympatrically, but the relationship between these forms within a population is poorly characterized. Through use of passive integrated transponder technology, migratory and resident coastal cutthroat trout were...

Johnson, Jeffrey R.; Baumsteiger, Jason; Zydlewski, Joseph D.; Hudson, J. Michael; Ardren, William R.

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Year Published: 2010

Ecoregion and land-use influence invertebrate and detritus transport from headwater streams

Summary 1. Habitats are often connected by fluxes of energy and nutrients across their boundaries. For example, headwater streams are linked to surrounding riparian vegetation through invertebrate and leaf litter inputs, and there is evidence that consumers in downstream habitats are subsidised by resources flowing from headwater systems. However...

Binckley, Christopher A.; Wipfli, Mark S.; Medhurst, R. Bruce; Polivka, Karl; Hessburg, Paul F.; Salter, R. Brion; Kill, Joshua Y.

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Year Published: 2010

Effects of an exotic prey species on a native specialist: example of the snail kite

Despite acknowledging that exotic species can exhibit tremendous influence over native populations, few case studies have clearly demonstrated the effects of exotic prey species on native predators. We examined the effects of the recently introduced island apple snail (Pomacea insularum) on the foraging behavior and energetics of the endangered...

Cattau, Christopher E.; Martin, J.; Kitchens, Wiley M.
Cattau C. Effects of an exotic prey species on a native specialist: Example of the snail kite. Biological conservation. 2010;143:513-520.

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Year Published: 2010

Movement distances and habitat switching by female Mallards wintering in the Lower Mississippi Alluvial Valley

Mallard (Anus platyrhynchos) populations in the Lower Mississippi Alluvial Valley (hereafter, LMAV) comprise the largest concentration of wintering Mallards in North America. Radiotelemetry techniques were employed to assess movements by female Mallards during winters of 2004-2005 and 2005-2006; 467 paired (diurnal and nocturnal) observations on...

Afton, Alan D.; Davis, Bruce E.

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Year Published: 2010

Vulnerability of white spruce tree growth in interior Alaska in response to climate variability: Dendrochronological, demographic, and experimental perspectives

This paper integrates dendrochronological, demographic, and experimental perspectives to improve understanding of the response of white spruce (Picea glauca (Moench) Voss) tree growth to climatic variability in interior Alaska. The dendrochronological analyses indicate that climate warming has led to widespread declines in white spruce growth...

McGuire, A. David; Ruess, Roger W.; Lloyd, A.; Yarie, J.; Clein, Joy S.; Juday, G.P.

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Year Published: 2010

Anchoring submersible ultrasonic receivers in river channels with stable substrate

We developed an anchoring system for submersible ultrasonic receivers (SURs) that we placed on the bottom of the riverine reaches of three main-stem reservoirs in the upper Tennessee River. Each anchor consisted of a steel tube (8.9 x 35.6 cm) welded vertically to a round plate of steel (5.1 x 40.6 cm). All seven SURs and their 57-kg anchors were...

Bettoli, Phillip William; Scholten, G.D.; Hubbs, D.
Bettoli, PW (Bettoli, Phillip W.)[ 1 ] ; Scholten, GD (Scholten, George D.)[ 2 ] ; Hubbs, DW (Hubbs, Don W.)[

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Year Published: 2010

Dispersal of smallmouth bass from a simulated tournament weigh-in site

Simulated smallmouth bass Micropterus dolomieu fishing tournaments were staged in Dale Hollow Lake, a 12,400-ha reservoir in Tennessee, between March 2004 and February 2005 to investigate posttournament dispersal. Smallmouth bass (n = 54) were captured with conventional hook-and-line tackle and artificial lures, placed in live wells, and subjected...

Kaintz, Melissa A.; Bettoli, Phillip William
Kaintz, MA (Kaintz, Melissa A.)[ 1 ] ; Bettoli, PW (Bettoli, Phillip W.)[ 1 ]