13 Works

Restoring function: positive responses of carbon and nitrogen to 20 years of hydrologic restoration in montane meadows

Cody Reed, Cody Reed, Asmeret Berhe, Kimber Moreland, Jim Wilcox & Benjamin Sullivan
Montane meadows are highly productive ecosystems that contain high densities of soil carbon (C) and nitrogen (N). However, anthropogenic disturbances that lead to channel incision and disconnected floodplain hydrology have altered the C balance of many meadows, converting them from net C sinks to net sources of C to the atmosphere. Restoration efforts designed to reconnect floodplain hydrology may slow rates of soil C loss from degraded meadows and restore conditions for C sequestration and...

In search of an honest butterfly: Sexually selected wing coloration and reproductive traits from wild populations of the Cabbage White Butterfly

Anne E Espeset & Matthew L Forister
Abstract Sexual selection is central to many theories on mate selection and individual behavior. Relatively little is known, however, about the impacts that human-induced rapid environmental change are having on secondary sexually selected characteristics. Honest signals function as an indicator of mate quality when there are differences in nutrient acquisition and are thus potentially sensitive to anthropogenically altered nutrient inputs. We used the cabbage white butterfly, Pieris rapae (L.) (Lepidoptera: Pieridae), to investigate differences in...

Data from: Estimating survival and adoption rates of dependent juveniles

Phillip Street
1. Population growth and fitness are typically most sensitive to adult survival in long-lived species, but variation in recruitment often explains most of the variation in fitness, as past selection has canalized adult survival. Estimating juvenile survival until age of independence has proven challenging, because marking individuals in this age class may directly affect survival. For Greater Sage-grouse, uniquely marking juveniles in the first days of life likely results in adverse effects to survival, detection...

History and environment shape spatial genetic variation and predict climate maladaptation in a narrowly distributed serotinous pine, Pinus muricata

Lanie Galland
Understanding the distribution of genetic diversity and differentiation in species with disjunct and isolated populations is critical for assessing how environment shapes genetic variation and the potential response to climate change. In contrast to the large distributions and population sizes of most pine species, Pinus muricata (Bishop pine) occurs in a small number of isolated and disjunct populations occupying a narrow band of environmental conditions along the coast of western North America. We used genotyping...

Assessing the population genetic structure of introduced rainbow trout (Oncorhynchus mykiss) in the Lake Tahoe basin: A case for understanding hybridization potential during the reintroduction of the native Endangered Species Act listed Lahontan cutthroat trout (O. clarkii henshawi)

Lanie Galland, Thomas Parchman & Mary Peacock
Hybridization with introduced or invasive species is a major threat and driver of population declines in native salmonids. The rainbow trout (Oncorhynchus mykiss, RBT) has been widely introduced globally and represents an important invasive species, often establishing entrenched naturalized populations. The cutthroat trout (Oncorhynchus clarkii, CT), a close congener, is particularly susceptible to competition and hybridization from RBT introductions which has led to range-wide population declines and loss of CT genetic variation. The Lahontan CT...

Ventenata Dubia Cover, forb diversity and forb richness

Scott Lukas, Brogan Watson, Lesley Morris, Sandra DeBano, Joshua Leffler & Heidi Schmalz
Questions: Grassland degradation due to agriculture, changing fire regimes, and invasive species negatively affects forb communities. Conserving forbs and the services they provide requires a better understanding of their responses to interacting disturbances. Although fire and livestock grazing are important disturbances, their effect on forb communities in the Pacific Northwest Bunchgrass Prairies is not fully understood. Our objectives were to: 1) determine how prescribed fire and livestock grazing influence forb community composition, cover, species richness,...

Seasonality of host immunity in a tropical disease system

Jamie Voyles, Goncalo Rosa, Rachel Perez, Lora Richards, Corinne Richards-Zawacki, Angela Smilanich, Laura K. Reinert, Louise A. Rollins-Smith, Daniel Wetzel & Jamie Voyles
Infectious disease systems frequently exhibit strong seasonal patterns, yet the mechanisms that underpin intra-annual cycles are unclear, particularly in tropical regions. We hypothesized that host immune function fluctuates seasonally, contributing to oscillations in infection patterns in a tropical disease system. To test this hypothesis, we investigated a key host defense of amphibians against a lethal fungal pathogen, Batrachochytrium dendrobatidis (Bd). We integrated two field experiments in which we perturbed amphibian skin secretions, a critical host...

Data from: Use of an exotic host plant shifts immunity, chemical defense, and viral burden in wild populations of a specialist insect herbivore

Nadya D. Muchoney, M. Deane Bowers, Adrian L. Carper, Peri A. Mason, Mike B. Teglas & Angela M. Smilanich
Defense against natural enemies constitutes an important driver of herbivore host range evolution in the wild. Populations of the Baltimore checkerspot butterfly, Euphydryas phaeton (Nymphalidae), have recently incorporated an exotic plant, Plantago lanceolata (Plantaginaceae), into their dietary range. To understand the tritrophic consequences of utilizing this exotic host plant, we examined immune performance, chemical defense, and interactions with a natural entomopathogen (Junonia coenia densovirus, Parvoviridae) across wild populations of this specialist herbivore. We measured three...

Female black brant body mass, ninth primary data

James Sedinger
Body mass declines during wing moult in numerous, but not all, populations of Anatidae. We assessed two leading hypotheses for body mass dynamics during the wing moult: (1) body mass dynamics are adapted to attain a target body mass at the end of the wing moult (restraint hypothesis), versus (2) body mass dynamics reflect environmental constraint on the nutrient-energy balance during wing moult (constraint hypothesis). We used regressions of mass of breeding female Black Brent,...

Atelopus zeteki skin secretions not protective against Bd

Jordan Gass
To combat the threat of emerging infectious diseases in wildlife, ecoimmunologists seek to understand the complex interactions among pathogens, their hosts, and their shared environments. The cutaneous fungal pathogen Batrachochytrium dendrobatidis (Bd), has led to the decline of innumerable amphibian species, including the Panamanian golden frog (Atelopus zeteki). Given that Bd can evade or dampen the acquired immune responses of some amphibians, nonspecific immune defenses are thought to be especially important for amphibian defenses against...

Large herbivores facilitate a dominant grassland plant via multiple indirect effects

Zhiwei Zhong, Xiaofei Li, Christian Smit, Tianyun Li, Ling Wang, Valeria Aschero, Diego Vázquez, Mark Ritchie, Hall Cushman & Deli Wang
While large herbivores are critically important components of terrestrial ecosystems and can have pronounced top-down effects on plants, our understanding of the underlying mechanisms driving these effects remains incomplete. Large herbivores can alter plant growth, reproduction and abundance through direct effects (predominantly consumption) and through indirect effects via altered interactions with abiotic factors and other species. We know considerably less about these indirect effects than the direct effects. Here, we integrate medium- and small-scale field...

Climatic history, constraints, and the plasticity of phytochemical traits under water stress

Aramee Diethelm, Michael Reichelt, Thomas Dilts, James Farlin, Audrey Marlar & Elizabeth Pringle
Environmental stress can induce changes in organismal traits and in resulting intraspecific variation. The nature of such effects will depend on the plasticity of trait expression and on any ecological constraints to such expression. Plants can mitigate abiotic stress, like drought, by changing their chemistry, but the ability to induce costly metabolites may be under strong local selection and ecologically constrained. Here we asked whether climate at the seed source predicts plant chemical plasticity in...

Data from: A hierarchical model for jointly assessing ecological and anthropogenic impacts on animal demography

Thomas Riecke, Benjamin Sedinger, Todd Arnold, Dan Gibson, David Koons, Madeleine Lohman, Michael Schaub, Perry Williams & James Sedinger
1. The management of sustainable harvest of animal populations is of great ecological and conservation importance. Development of formal quantitative tools to estimate and mitigate the impacts of harvest on animal populations has positively impacted conservation efforts. 2. The vast majority of existing harvest models, however, do not simultaneously estimate ecological and harvest impacts on demographic parameters and population trends. Given that the impacts of ecological drivers are often equal to or greater than the...

Registration Year

  • 2022
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  • University of Nevada Reno
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