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Wildland Resources Faculty Publications

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Soil Type More Than Precipitation Determines Fine-Root Abundance In Savannas Of Kruger National Park, South Africa, Andrew Kulmatiski, Sydney R.C. Sprouse, Karen H. Beard May 2017

Soil Type More Than Precipitation Determines Fine-Root Abundance In Savannas Of Kruger National Park, South Africa, Andrew Kulmatiski, Sydney R.C. Sprouse, Karen H. Beard

Wildland Resources Faculty Publications

Aims Our aim was to examine how soil type and precipitation affect fine-root abundance in savanna ecosystems across Kruger National Park (KNP), South Africa. Methods Fine-root distributions were measured in four sites that represent the natural factorial combination of soil types (basalt-derived clay or granite-derived sand) and precipitation regimes [wet (~750 mm mean annual precipitation) or dry (~500 mm mean annual precipitation)] that occur in KNP. Root area and biomass (at soil depths of 0–75 cm) were estimated from measurements of root number, length and width in images from minirhizotron tubes at each site. Measurements were made during one ...


Weather And Prey Availability Affect The Timing Of Fall Migration Of Eared Grebes (Podiceps Nigricollis) From Great Salt Lake, Maureen G. Frank, Michael R. Conover Jan 2017

Weather And Prey Availability Affect The Timing Of Fall Migration Of Eared Grebes (Podiceps Nigricollis) From Great Salt Lake, Maureen G. Frank, Michael R. Conover

Wildland Resources Faculty Publications

Great Salt Lake (GSL) is a critical migratory stopover location for Eared Grebes (Podiceps nigricollis), but the factors influencing the timing of their fall migration have not previously been investigated. We used archived Doppler radar data to visualize the nocturnal departures of Eared Grebes from GSL over 16 years, from 1999–2015. We used generalized linear models (GLMs) to examine interannual variability in the timing of migration of Eared Grebes in relation to prey availability and lake temperature, as well as variation in the nightly departure likelihoods of Eared Grebes in relation to weather. On average, Eared Grebes departed from ...


Effects Of Road And Land Use On Frog Distributions Across Spatial Scales And Regions In The Eastern And Central United States, David M. Marsh, Bradley J. Cosentino, Kara S. Jones, Joseph J. Apodaca, Karen H. Beard, Jane Margaret Bell, Christine Bozarth, Derrick Carper, Julie F. Charbonnier, Andreia Dantas, Elizabeth A. Forys, Miran Foster, Jaquelyn General, Kristen S. Genet, Macie Hanneken, Kyle R. Hess, Shane A. Hill, Faisal Iqbal, Nancy E. Karraker, Eran S. Kilpatrick, Tom A. Langen, James Langford, Kathryn Lauer, Alison J. Mccarthy, Joseph Neale, Saumya Patel, Austin Patton, Cherie Southwick, Nathaniel Stearrett, Nicholas Steijn, Mohammed Tasleem, Jospeh M. Taylor, James R. Vonesh Nov 2016

Effects Of Road And Land Use On Frog Distributions Across Spatial Scales And Regions In The Eastern And Central United States, David M. Marsh, Bradley J. Cosentino, Kara S. Jones, Joseph J. Apodaca, Karen H. Beard, Jane Margaret Bell, Christine Bozarth, Derrick Carper, Julie F. Charbonnier, Andreia Dantas, Elizabeth A. Forys, Miran Foster, Jaquelyn General, Kristen S. Genet, Macie Hanneken, Kyle R. Hess, Shane A. Hill, Faisal Iqbal, Nancy E. Karraker, Eran S. Kilpatrick, Tom A. Langen, James Langford, Kathryn Lauer, Alison J. Mccarthy, Joseph Neale, Saumya Patel, Austin Patton, Cherie Southwick, Nathaniel Stearrett, Nicholas Steijn, Mohammed Tasleem, Jospeh M. Taylor, James R. Vonesh

Wildland Resources Faculty Publications

Understanding the scales over which land use affects animal populations is critical for conservation planning, and it can provide information about the mechanisms that underlie correlations between species distributions and land use. We used a citizen science database of anuran surveys to examine the relationship between road density, land use and the distribution of frogs and toads across spatial scales and regions of the United States.


Effectiveness Of The Toxicant Drc-1339 In Reducing Populations Of Common Ravens In Wyoming, Luke W. Peebles, Michael R. Conover Jun 2016

Effectiveness Of The Toxicant Drc-1339 In Reducing Populations Of Common Ravens In Wyoming, Luke W. Peebles, Michael R. Conover

Wildland Resources Faculty Publications

Common raven (Corvus corax) populations have increased several-fold in the western United States during the past century; these birds cause problems when they kill new-borne lambs and calves and depredate nests of greater sage-grouse (Centrocercus urophasianus). The toxicant DRC-1339 is used by U.S. Department of Agriculture/Animal and Plant Health Inspection Service Wildlife Services to manage common raven populations and reduce the severity of these problems, but it is difficult to determine how many ravens are killed by an application because carcasses are rarely found. We examined the effectiveness of DRC-1339 applications for preventative control of ravens at 3 ...


Microhabitat Conditions In Wyoming’S Sage-Grouse Core Areas: Effects On Nest Site Selection And Success, Jonathan B. Dinkins, Kurt T. Smith, Jeffrey L. Beck, Christopher P. Kirol, Aaron C. Pratt, Michael R. Conover Mar 2016

Microhabitat Conditions In Wyoming’S Sage-Grouse Core Areas: Effects On Nest Site Selection And Success, Jonathan B. Dinkins, Kurt T. Smith, Jeffrey L. Beck, Christopher P. Kirol, Aaron C. Pratt, Michael R. Conover

Wildland Resources Faculty Publications

The purpose of our study was to identify microhabitat characteristics of greater sage-grouse (Centrocercus urophasianus) nest site selection and survival to determine the quality of sage-grouse habitat in 5 regions of central and southwest Wyoming associated with Wyoming’s Core Area Policy. Wyoming’s Core Area Policy was enacted in 2008 to reduce human disturbance near the greatest densities of sage-grouse. Our analyses aimed to assess sage-grouse nest selection and success at multiple micro-spatial scales. We obtained microhabitat data from 928 sage-grouse nest locations and 819 random microhabitat locations from 2008–2014. Nest success was estimated from 924 nests with ...


Bromeliad Selection Of Phyllodytes Luteolus (Anura, Hylidae): The Influence Of Plant Structure And Water Quality Factors, Marcio M. Mageski, Rodrigo Barbosa Ferreira, Karen H. Beard, Larissa C. Costa, Paulo R. Jesus, Cinthia C. Medeiros, Paulo D. Ferreira Jan 2016

Bromeliad Selection Of Phyllodytes Luteolus (Anura, Hylidae): The Influence Of Plant Structure And Water Quality Factors, Marcio M. Mageski, Rodrigo Barbosa Ferreira, Karen H. Beard, Larissa C. Costa, Paulo R. Jesus, Cinthia C. Medeiros, Paulo D. Ferreira

Wildland Resources Faculty Publications

Bromeliads are used by many frog species because of their capacity to accumulate rainwater. The bromeligenous frog, Phyllodytes luteolus (Yellow Heart-Tongued Frog), uses bromeliads for its entire life cycle including shelter, foraging, and reproduction. We evaluated the effect of plant morphometrics and the properties of water accumulated in bromeliads on the selection of these plants by P. luteolus. We sampled 103 bromeliads of which 41 were unoccupied and 62 were occupied by P. luteolus. Results suggest that bromeliad occupation by P. luteolus is nonrandom. We found that occupied plants were shorter in height, had a greater number of leaves, and ...


Consequences Of Hunter Harvest, Winter Weather, And Increasing Population Size On Survival Of Non-Migratory Canada Geese In Connecticut, Michael R. Conover, Jonathan B. Dinkins, Rebekah E. Ruzicka Nov 2015

Consequences Of Hunter Harvest, Winter Weather, And Increasing Population Size On Survival Of Non-Migratory Canada Geese In Connecticut, Michael R. Conover, Jonathan B. Dinkins, Rebekah E. Ruzicka

Wildland Resources Faculty Publications

Conover, M. R., J. B. Dinkins, and R. E. Ruzicka. 2015. Consequences of hunter harvest, winter weather, and increasing population size on survival of non-migratory Canada geese in Connecticut. Journal of Wildlife Management 79: 1239-1245.


Evaluation Of Harvest Indices For Monitoring Cougar Survival And Abundance, Michael L. Wolfe, Eric Gese, Patricia Terletzky, David C. Stoner, Lise M. Aubry Sep 2015

Evaluation Of Harvest Indices For Monitoring Cougar Survival And Abundance, Michael L. Wolfe, Eric Gese, Patricia Terletzky, David C. Stoner, Lise M. Aubry

Wildland Resources Faculty Publications

Harvest indices are used by state wildlife management agencies to monitor population trends and set harvest quotas for furbearer species. Although harvest indices may be readily collected from hunters, the reliability of harvest indices for monitoring demography and abundance of the harvested species is rarely examined, particularly amongst large carnivores. The overall objective of this study was to assess whether cougar (Puma concolor) harvest statistics collected by wildlife managers were correlated with changes in cougar demography, mainly survival rates and abundance. We estimated key demographic parameters for 2 cougar populations in Utah over 17 years during which we monitored 235 ...


Influence Of Shelterbelts On Success And Density Of Waterfowl Nests Within The Prairie Pothole Region Of North America, Jennifer S. Borgo, Michael R. Conover Aug 2015

Influence Of Shelterbelts On Success And Density Of Waterfowl Nests Within The Prairie Pothole Region Of North America, Jennifer S. Borgo, Michael R. Conover

Wildland Resources Faculty Publications

Shelterbelts are long rows of trees planted in the Great Plains of North America to reduce wind erosion of soil. Shelterbelts alter airflow, creating updrafts on the windward side (updraft zone), slow winds immediately on the leeward side (calm zone), and increased turbulence farther downwind of the shelterbelt (turbulent zone). They also provide hunting perches for avian predators and serve as corridors for mammalian predators. By determining the fate of 247 duck nests located in 27 Waterfowl Production Areas during 2006 and 2007, this study tested the hypothesis that duck nests located close to shelterbelts are more likely to be ...


Spatio-Temporal Patterns In The Depredation Of Waterfowl Nests In The Prairie Potholes Region, Usa, Jennifer S. Borgo, Michael R. Conover Mar 2015

Spatio-Temporal Patterns In The Depredation Of Waterfowl Nests In The Prairie Potholes Region, Usa, Jennifer S. Borgo, Michael R. Conover

Wildland Resources Faculty Publications

Nest depredation is the leading cause of waterfowl nest failures in much of the Prairie Pothole Region, USA. In 2006 and 2007, spatial and temporal patterns of nest depredation were evaluated on 248 waterfowl nests and 88 simulated waterfowl nests in North Dakota, USA. The hypothesis that predators are able to locate adjacent nests using an area-restricted search once they find the first nest and that ducks will space their nests apart to reduce this from happening was tested. However, no evidence was found to support either part of this hypothesis or that density-dependent depredation was occurring. This lack of ...


Breeding Origins Of Northern Shovelers (Anas Clypeata) Wintering On The Great Salt Lake, Utah, Anthony J. Roberts, Michael R. Conover Sep 2014

Breeding Origins Of Northern Shovelers (Anas Clypeata) Wintering On The Great Salt Lake, Utah, Anthony J. Roberts, Michael R. Conover

Wildland Resources Faculty Publications

The breeding origin and migratory connectivity of wintering birds are important to address how population changes on wintering areas are impacted by changes elsewhere in the birds’ annual cycle. In addition, identifying important point sources of nutrients used throughout the annual cycle can assist managers in identifying sources of toxins or pathogens. We used stable hydrogen isotope ratios to identify breeding locations of Northern Shovelers (Anas clypeata; henceforth shoveler) wintering at the Great Salt Lake (GSL), Utah. Stable-isotope likelihood-based assignment placed the largest number of shovelers collected during winter on the GSL as breeding in the western US and southern ...


Diet And Body Mass Of Ducks In The Presence Of Commercial Harvest Of Brine Shrimp Cysts In The Great Salt Lake, Utah, Anthony J. Roberts, Michael R. Conover Aug 2014

Diet And Body Mass Of Ducks In The Presence Of Commercial Harvest Of Brine Shrimp Cysts In The Great Salt Lake, Utah, Anthony J. Roberts, Michael R. Conover

Wildland Resources Faculty Publications

Commercial fisheries and waterbirds are often in competition for available resources and may affect each other through limiting available forage for birds or reducing harvest for commercial fisheries. Relatively little is known regarding the wintering population of waterfowl on the hypersaline Great Salt Lake (GSL), Utah, but mid-winter counts indicate waterfowl use the GSL during winter coinciding with a commercial harvest of brine shrimp (Artemia franciscana) cysts (i.e., eggs). We surveyed previously unmonitored pelagic regions of GSL to estimate total wintering populations of waterfowl and collected northern shoveler (Anas clypeata) and green-winged teal (Anas crecca) during 3 nonbreeding seasons ...


Role Of Benthic Substrate In Waterfowl Distribution On Great Salt Lake, Anthony J. Roberts, Michael R. Conover Jun 2014

Role Of Benthic Substrate In Waterfowl Distribution On Great Salt Lake, Anthony J. Roberts, Michael R. Conover

Wildland Resources Faculty Publications

Benthic substrate has a large impact on aquatic plant and invertebrate assemblages and likely directly or indirectly influences waterbird distributions. The association of birds with various substrates can be important in survey design or habitat management. Northern Shoveler (Anas clypeata), Common Goldeneye (Bucephala clangula), Eared Grebe (Podiceps nigricollis), Ring-billed Gull (Larus delawarensis) and California Gull (L. californicus) densities on the hypersaline Great Salt Lake, Utah, were estimated to determine the association of bird distributions with benthic substrates. Three of the four groups of species monitored had densities that varied by benthic substrate; gulls were the exception. Eared Grebes occurred at ...


Greater Sage-Grouse (Centrocercus Urophasianus) Hen Survival: Effects Of Raptors, Anthropogenic And Landscape Features, And Hen Behavior, Jonathan B. Dinkins, Michael R. Conover, Christopher P. Kirol, Jeffrey L. Beck, S. Nicole Frey Feb 2014

Greater Sage-Grouse (Centrocercus Urophasianus) Hen Survival: Effects Of Raptors, Anthropogenic And Landscape Features, And Hen Behavior, Jonathan B. Dinkins, Michael R. Conover, Christopher P. Kirol, Jeffrey L. Beck, S. Nicole Frey

Wildland Resources Faculty Publications

Survival of breeding-age hens has been identified as the demographic rate with the greatest potential to influence population growth of Greater Sage-Grouse (Centrocercus urophasianus (Bonaparte, 1827); hereafter “Sage-Grouse”). During 2008–2011, we collected summer survival data from 427 Sage-Grouse hens in southern Wyoming, USA. We assessed the effects of raptor densities, anthropogenic features, landscape features, and Sage-Grouse hen behavior on Sage-Grouse hen survival. Survival of Sage-Grouse hens was positively associated with the proportion of big sagebrush (genus Artemisia L.) habitat within 0.27 km radius and road density and negatively associated with power-line density, proximity to forested habitat, and topographic ...


Population Fluctuations And Distribution Of Staging Eared Grebes (Podiceps Nigricollis) In North America, Anthony J. Roberts, Michael R. Conover, John Luft, John Neil Oct 2013

Population Fluctuations And Distribution Of Staging Eared Grebes (Podiceps Nigricollis) In North America, Anthony J. Roberts, Michael R. Conover, John Luft, John Neil

Wildland Resources Faculty Publications

Eared Grebes (Podiceps nigricollis Brehm, 1831) use saline ecosystems throughout much of their life cycle, and greater than 90% of the North American population stage during fall at two hypersaline lakes. At one of these lakes, Great Salt Lake (GSL), Utah, a commercial harvest of brine shrimp (Artemia franciscana Kellogg, 1906) cysts occurs during fall and may impact Eared Grebe populations. We used photo surveys on the other hypersaline lake, Mono Lake, California, and on the GSL, as well as aerial counts on the GSL, to describe population fluctuations of Eared Grebes staging on these lakes. The long-term (1997–2012 ...


Effects Of Increasing Age On Fecundity Of Old-Aged Canada Geese (Branta Canadensis), Michael R. Conover May 2013

Effects Of Increasing Age On Fecundity Of Old-Aged Canada Geese (Branta Canadensis), Michael R. Conover

Wildland Resources Faculty Publications

Conover, M. R. 2013. Effects of increasing age on fecundity of old-aged Canada geese (Branta canadensis). Waterbirds 36: 378-384.


Ungulate Damage To Safflower In Utah, Michael J. Haney, Michael R. Conover Feb 2013

Ungulate Damage To Safflower In Utah, Michael J. Haney, Michael R. Conover

Wildland Resources Faculty Publications

In Utah, farmers are concerned that ungulates are damaging safflower (Carthamus tinctorius) fields. We examined elk (Cervus elaphus) and mule deer (Odocoileus hemionus) damage to safflower production in San Juan County, Utah during 2009 and 2010. We collected data on damaged safflower plants within 28 fields, totaling 1,581 ha (13 fields totaling 963 ha during 2009; 15 fields totaling 618 ha during 2010). We compared 3 methods to assess yield losses: ungulate-proof exclosures, adjacent plant compensation method, and counting the number of damaged plants in 50-m transects (safflower count method). Exclosures were of limited use because they could not ...


Does Weather Or Site Characteristics Influence The Ability Of Scavengers To Locate Food?, Rebekah E. Ruzicka, Michael R. Conover Dec 2011

Does Weather Or Site Characteristics Influence The Ability Of Scavengers To Locate Food?, Rebekah E. Ruzicka, Michael R. Conover

Wildland Resources Faculty Publications

Olfactory predators and scavengers rely on odors to locate food, and they forage primarily at night. We hypothesized that weather (e.g. wind speed, humidity, and temperature), vegetation, and landscape features affect the dissipation of odors in the atmosphere and, thus, impact the foraging efficiency of olfactory predators. We tested this hypothesis by assessing what conditions were correlated with the persistence of bait along the dike surrounding Willard Bay Reservoir, Utah. We distributed 124 chicken eggs and 199 dead European starlings (Sturnus vulgaris) as bait over 21 separate occasions spanning from May 21, 2009, to August 18, 2009. We used ...


Effects Of Large-Scale Removal Of Coyotes On Pronghorn And Mule Deer Productivity And Abundance, Dylan E. Brown, Michael R. Conover May 2011

Effects Of Large-Scale Removal Of Coyotes On Pronghorn And Mule Deer Productivity And Abundance, Dylan E. Brown, Michael R. Conover

Wildland Resources Faculty Publications

We tested the hypothesis that predation by coyotes (Canis latrans) impacts pronghorn (Antilocapra americana) and mule deer (Odocoileus hemionus) populations. We did so by examining the effects of coyote removal on pronghorn and mule deer populations within 12 large areas (>10,500 km2) located in Wyoming and Utah during 2007 and 2008. Pronghorn productivity (fawn to adult female ratio) and abundance were positively correlated with the number of coyotes removed and removal effort (hours spent hunting coyotes from aircraft) although the correlation between pronghorn productivity and removal effort was not statistically significant (P = 0.08). Mule deer productivity and abundance ...


Population Growth And Movements Of Canada Geese In New Haven, Connecticut During A 25-Year History, Michael R. Conover Jan 2011

Population Growth And Movements Of Canada Geese In New Haven, Connecticut During A 25-Year History, Michael R. Conover

Wildland Resources Faculty Publications

In the last few decades, Canada Geese (Branta canadensis) have become established in metropolitan areas throughout North America. From 1984 through 2009, Canada Geese in New Haven County, Connecticut, were banded as goslings (HY geese) and adults (AHY), and their movements and recruitment into the local breeding population were documented. During this period, the number of Canada Geese increased several fold in Connecticut. Geese were non-migratory; most recoveries (85%) of banded Canada Geese came from Connecticut, and 76% came from New Haven County. Dispersal rates outside of Connecticut peaked during 1990–1994 when 23% of all reported geese were shot ...


Food Habits Of Wintering Waterfowl On The Great Salt Lake, Utah, Josh L. Vest, Michael R. Conover Jun 2010

Food Habits Of Wintering Waterfowl On The Great Salt Lake, Utah, Josh L. Vest, Michael R. Conover

Wildland Resources Faculty Publications

Two invertebrates, brine shrimp (Artemia franciscana) and brine flies (Ephydridac), occur in great densities in the Great Salt Lake (GSL) but it is unknown whether ducks forage extensively on them during winter or rely on freshwater food. Common Goldeneye (Bucephala clangula), Northern Shoveler (Anas clypeala) and Green-winged Teal (Anas crecca) were collected from the GSL during winters 2004–05 and 2005–06 to evaluate their food habits. Brine shrimp and brine flies comprised more than 70% of the winter diet of these ducks. Common Goldeneyes consumed mainly brine fly larvae (68% based on dry weight biomass), which live primarily along ...


Flying Squirrel Removal Does Not Reduce Their Use Of Simulated Red-Cockaded Woodpecker Nest Cluster, Jennifer S. Borgo, Michael R. Conover, L. Michael Conner Jan 2010

Flying Squirrel Removal Does Not Reduce Their Use Of Simulated Red-Cockaded Woodpecker Nest Cluster, Jennifer S. Borgo, Michael R. Conover, L. Michael Conner

Wildland Resources Faculty Publications

Reproductive success of the endangered Picoides borealis (Red-cockaded Woodpecker) is thought to be reduced by the presence of Glaucomys volans (Southern Flying Squirrels); hence, these squirrels are often removed when found inside woodpecker cavities. For this management practice to benefit Red-cockaded Woodpeckers, however, squirrel removal must both reduce the future probability of a flying squirrel re-occupying cavities and increase reproductive success for Red-cockaded Woodpeckers. In this study, using simulated Red-cockaded Woodpecker clusters (pseudo-clusters), we tested the first assumption regarding squirrels reoccupying nest cavities. We found no differences between removal and control pseudo-clusters in the amount of time that flying squirrels ...


Energy Budgets Of Eared Grebes On The Great Salt Lake And Implications For Harvest Of Brine Shrimp, Michael R. Conover, Joe N. Caudell Sep 2009

Energy Budgets Of Eared Grebes On The Great Salt Lake And Implications For Harvest Of Brine Shrimp, Michael R. Conover, Joe N. Caudell

Wildland Resources Faculty Publications

About 1.5-million eared grebes (Podiceps nigricollis), representing half of the North American population, stage on Utah's Great Salt Lake, USA (GSL) during autumn migration to forage on brine shrimp (Artemia franciscana). Indirectly competing with birds for brine shrimp are commercial harvesters who annually collect >1 million kg (dry wt) of shrimp cysts (i.e., hardened eggs), an amount that during some years equals up to half of all brine shrimp cysts produced annually on the GSL. No information was available regarding what impact this commercial harvest was having on eared grebes. We determined daily energy requirements of eared ...


Concentrations Of Selenium And Mercury In Eared Grebes (Podiceps Nigricollis) From Utah’S Great Salt Lake, Usa, Michael R. Conover, Josh L. Vest Jun 2009

Concentrations Of Selenium And Mercury In Eared Grebes (Podiceps Nigricollis) From Utah’S Great Salt Lake, Usa, Michael R. Conover, Josh L. Vest

Wildland Resources Faculty Publications

We examined selenium and mercury concentrations in eared grebes (Podiceps nigricollis) that spent the fall of 2006 on the Great Salt Lake (UT, USA), where their diet consisted mainly of brine shrimp (Artemia franciscana). Selenium concentrations in livers varied based on when the grebes were collected (lower in September [mean ± standard error, 9.4 ± 0.7 μg/g dry wt] than in November [14.5 ± 1.4 μg/g]), on where the birds were collected on the Great Salt Lake (Antelope Island, 8.6 ± 0.5 μg/g; Stansbury Island, 15.2 ± 1.4 μg/g), and on the grebe ...


Do Sharp-Tailed Grouse Select Loafing Sites To Avoid Visual Or Olfactory Predators?, Michael R. Conover, Jennifer S. Borgo Feb 2009

Do Sharp-Tailed Grouse Select Loafing Sites To Avoid Visual Or Olfactory Predators?, Michael R. Conover, Jennifer S. Borgo

Wildland Resources Faculty Publications

Grouse should seek loafing sites hidden from predators; however, good hiding sites from predators that use vision to locate prey differ from good hiding sites from predators that use odor to locate prey. We compared characteristics of control sites to sites used for loafing by sharp-tailed grouse (Tympanuchus phasianellus) to determine whether selection of loafing sites was more influenced by the need to hide from visual or olfactory predators. Sites used for loafing were similar to control sites in characteristics that would help hide a grouse from visual predators (i.e., visual obstruction, lateral visibility, visual obstruction, cover ht, and ...


Selenium And Mercury Concentrations In California Gulls Breeding On The Great Salt Lake, Utah, Usa, Michael R. Conover, Josh L. Vest Feb 2009

Selenium And Mercury Concentrations In California Gulls Breeding On The Great Salt Lake, Utah, Usa, Michael R. Conover, Josh L. Vest

Wildland Resources Faculty Publications

We examined selenium (Se) and mercury (Hg) concentrations in adult California gulls (Larus californicus) nesting on the Great Salt Lake, Utah, USA, during 2006 and 2007. During 2006, the mean Se concentration (± standard error) was 18.1 ± 1.5 μg/g in blood on a dry-weight basis and 8.1 ± 0.4 μg/g in liver. During 2007, Se concentrations were 15.7 ± 1.5 μg/g in blood and 8.3 ± 0.4 μg/g in liver; Hg concentrations were 2.4 ± 0.3 μg/g in blood and 4.1 ± 0.5 μg/g in liver. Gulls collected ...


Influence Of Population Reduction On Predator Home Range Size And Spatial Overlap, S. Nicole Frey, Michael R. Conover Apr 2007

Influence Of Population Reduction On Predator Home Range Size And Spatial Overlap, S. Nicole Frey, Michael R. Conover

Wildland Resources Faculty Publications

The increasing populations of red foxes (Vulpes vulpes), raccoons (Procyon lotor), and striped skunks (Mephitis mephitis) in the Intermountain West have contributed to low waterfowl recruitment in recent decades. This effect prompted the need for predator removal at many waterfowl refuges, such as the Bear River Migratory Bird Refuge (BRMBR) in the Great Salt Lake ecosystem. Our study examined the effects of the removal of predatory mammals at the BRMBR on the home range size and spatial overlap of the remaining populations of red foxes, raccoons, and striped skunks. The removal of predators through traps, snares, and night-shooting created a ...