16 Works

Resource allocation effects on the timing of reproduction in an avian habitat specialist

Kyle Cutting, Jay Rotella, James Waxe, Aaron O' Harra, Sean Schroff, Lorelle Berkeley, Mark Szczypinski, Andrea Litt & Bok Sowell
Variation in nutrient allocation can influence the timing of breeding and ultimately reproductive output. Time and space constraints might exist, however, if fewer food resources are available to meet the costs of reproduction early during the reproductive season. Here, for the first time, we test whether nutrient allocation strategies for reproduction in a shrub-dependent avian species differs with timing of breeding in different ecoregions: a high-elevation landscape, containing spatially complex vegetation (Rocky Mountains) versus a...

Combined influence of intrinsic and environmental factors in shaping productivity in a small pelagic gull, the black-legged kittiwake Rissa tridactyla

Aly McKnight, David Irons, Cynthia Loftin, Shawn McKinney & Brian Olsen
While we have a good understanding in many systems of the effects of single variable changes on organisms, we understand far less about how variables act in concert to affect living systems, where interactions among variables can lead to unanticipated results. We used mixed-effect models to evaluate the effects of multiple variables that we expected to play a role in the early reproductive stages of a North Pacific seabird, the black-legged kittiwake Rissa tridactyla, during...

Avian Response to Hurricane Maria in Coffee Plantations

Jaime Collazo, Amarilys Irizarry, Ivette Perfecto & John Vandermeer
Insights on impacts and resiliency of avian species with respect to hurricanes in the Caribbean have largely focused on responses measured in protected habitats. We assessed avian responses in non-protected habitat, specifically shade-restored coffee plantations, because their structural complexity retains many attributes of secondary forests, and may contribute to landscape scale species resiliency. We tallied species richness and estimated occupancy probability of 12 resident avian species, after adjusting for imperfect detection, to assess the impact...

Coldwater fish in a warm water world: implications for predation of salmon smolts during estuary transit

Matthew Nobriga, Cyril Michel, Rachel Johnson & J.D. Wikert
Predator-prey systems face intensifying pressure from human exploitation and a warming climate with implications for where and how natural resource management can successfully intervene. We hypothesized young salmon migrating to the Pacific Ocean face a seasonally intensifying predator gauntlet when warming water temperature intensifies a multiple predator effect (MPE) from Striped Bass Morone saxatilis, and Largemouth Bass Micropterus salmoides. We evaluated this hypothesis using data synthesis and simulation modeling. 2. Contemporary studies based on acoustically-tagged...

Geographic patterns of genomic variation in the threatened Salado salamander, Eurycea chisholmensis

Chris Nice, James Fordyce, V. Alex Sotola, Justin Crow & Peter Diaz
Aquatic, karst and spring endemic organisms have become a focus of conservation efforts as human population densities and demand for groundwater increase. This is especially true of Texas salamanders in the genus Eurycea that have been the subject of investigations of patterns of genetic differentiation in order to understand their systematics and to inform conservation planning. Here we quantify patterns of population differentiation in the northern most species, Eurycea chisholmensis, the Salado salamander, which is...

Lake food webs: Species invasion progressively disrupts the trophic structure of native food webs

Charles Wainright, Clint Muhlfeld, James Elser, Samuel Bourret & Shawn Devlin
Species invasions can have substantial impacts on native species and ecosystems, with important consequences for biodiversity. How these disturbances drive changes in the trophic structure of native food webs through time is poorly understood. Here, we quantify trophic disruption in freshwater food webs to invasion by an apex fish predator, lake trout, using an extensive stable isotope dataset across a natural gradient of uninvaded and invaded lakes in the northern Rocky Mountains, USA. Lake trout...

Evidence of absence regression: a binomial N-mixture model for estimating fatalities at wind power facilities

Trent McDonald, Kimberly Bay, Jared Studyvin, Jesse Leckband, Amber Schorg & Jennifer McIvor
Estimating bird and bat fatalities caused by wind-turbine facilities is challenging when carcass counts are rare and produce counts that are either exactly zero or very near zero. The rarity of found carcasses is exacerbated when live members of a particular species are rare and when carcasses degrade quickly, are removed by scavengers, or are not detected by observers. With few observed carcass counts, common statistical methods like logistic, Poisson, or negative binomial regression are...

Do early-successional weeds facilitate or compete with seedlings in forest restoration? Disentangling abiotic vs. biotic factors

Mylen Arias, Rupesh Kariyat, Kimberly Wahl, Stephany Mendez, Jesus Chavana & Bradley Christoffersen
Census data for seedlings part of a weed exclusion experiment at Sal del Rey, Texas within a larger field where ~100,000 seedlings were planted in October-November 2018. Records seedling height, vigor (0 - dead, > 0 - alive), branching, and animal damage for 158 individuals of eight species classified by growth habit (fast/slow) and distributed in control and exclusion (mowed) plots across seven censuses.

Genetic divergence and diversity reflect a predominant freshwater resident life history in Rainbow Trout from southwestern Alaska

Jeffrey Olsen
Rainbow Trout Oncorhynchus mykiss in southwestern Alaska occupy coastal watersheds near the northern boundary of the species native range and support a world class wild trout sport fishery. Although low freshwater temperatures and a short growing season in this region may favor anadromy, these populations appear to exhibit a freshwater resident life history strategy. In this study we used genetic data to evaluate two hypotheses regarding the influence of the presumed migratory behavior of these...

Pleistocene aridification underlies the evolutionary history of the Caribbean endemic, insular giant, Consolea (Opuntioideae)

Lucas Majure, Duniel Barrios, Edgardo Díaz, Bethany Zumwalde, Weston Testo & Vivian Negrón-Ortíz
Premise: The Caribbean islands are renowned for their small size but high species diversity, and cacti make up a fascinating component of seasonally dry tropical forest (SDTF) there. Consolea consist of nine species of dioecious, hummingbird pollinated trees endemic to the West Indies, which form a conspicuous element of the SDTF. Several species are threatened by anthropogenic disturbance, disease, sea-level rise and invasive species, and are of conservation concern. However, no comprehensive phylogeny yet exists...

Plasma metabolite indices are robust to extrinsic variation and useful indicators of foraging habitat quality in Lesser Scaup (Aythya affinis)

Eric Smith, Michael Anteau, Heath Hagy & Christopher Jacques
This dataset contains plasma lipid metabolite values collected from Lesser Scaup (Aythya affinis) during spring migration (March 2016 and 2017) as described in the paper "Smith, E.J., M.J. Anteau, H. M. Hagy and C.N. Jacques (2021). Plasma metabolite indices are robust to extrinsic variation and useful indicators of foraging habitat quality in Lesser Scaup (Aythya affinis). Ornithology. In press." The experiment investigates the use of plasma metabolites beta-hydroxybutyrate (BOHB) and triglyceride (TRIG) as predictors of...

Lesser Yellowlegs location data describing the occurrence of birds within harvest zones in the Caribbean and South America

Laura A. McDuffie, Katherine S. Christie, Autumn-Lynn Harrison, Audrey R. Taylor, Brad A. Andres, Benoit Laliberte & James A. Johnson
Shorebirds have experienced a precipitous reduction in abundance over the past four decades. While some threats to shorebirds are widespread (e.g. habitat alteration), others are regional and may affect specific populations. Lesser Yellowlegs (Tringa flavipes) are long-distance migrants that breed across the North American boreal biome and have declined in abundance by 60-80% since the 1970s. The documented harvest of Lesser Yellowlegs in the Caribbean and northeastern South America during southward migration is a possible...

Genetic variation in sea otters (Enhydra lutris) from the North Pacific with relevance to the threatened Southwest Alaska distinct population segment

Blair Flannery, Ora Russ, Michelle St. Martin, William Beatty, Kristin Worman, Joel Garlich-Miller, Varena Gill, Patrick Lemons, Daniel Monson, Kimberly Kloecker, Daniel Esler & John Wenburg
For the sea otter (Enhydra lutris), genetic population structure is an area of research that has not received significant attention, especially in Southwest Alaska where that distinct population segment has been listed as threatened since 2005 pursuant to the U.S. Endangered Species Act. In this study, 501 samples from 14 locations from Prince William Sound, Alaska to the Commander Islands in Russia were analyzed for variation at 13 microsatellite loci. Our results indicate a high...

Black Scoter habitat use along the southeastern coast of the United States

Beth Ross, Hannah Plumpton & Emily Silverman
While the Atlantic Coast of the United States and Canada is a major wintering area for sea ducks, knowledge about their wintering habitat use is relatively limited. Black Scoters have a broad wintering distribution and are the only open water species of sea duck that is abundant along the southeastern coast of the United States. Our study identified variables that affected Black Scoter (Melanitta americana) distribution and abundance in the Atlantic Ocean along the southeastern...

Still time for action: genetic conservation of imperiled South Canadian River fishes, Arkansas River Shiner (Notropis girardi), Peppered Chub (Macrhybopsis tetranema) and Plains Minnow (Hybognathus placitus)

Megan Osborne, Joanna Hatt, Eliza Gilbert & Stephen Davenport
Pelagic broadcast spawning cyprinids have declined throughout the North American Great Plains because of adverse habitat changes caused by river fragmentation and altered flow regimes. Despite losses elsewhere, a 218-river kilometer section of the South Canadian River maintains three of these imperiled species: Arkansas River Shiner, Peppered Chub and Plains Minnow. The objective of this study was to determine if species occupying the same river stretch and hence a shared environment, exhibit the same trajectory...

Thermal ecology and baseline energetic requirements of a large-bodied ectotherm suggest resilience to climate change

Hayley Crowell, Katherine King, James Whelan, Mallory Harmel, Gennesee Garcia, Sebastian Gonzales, Paul Maier, Heather Neldner, Thomas Nhu, John Nolan & Emily Taylor
Most studies on how rising temperatures will impact terrestrial ectotherms have focused on single populations or multiple sympatric species. Addressing the thermal and energetic implications of climatic variation on multiple allopatric populations of a species will help us better elucidate how a species may be impacted by altered climates. We used eight years of thermal and behavioral data collected from four populations of Pacific rattlesnakes (Crotalus oreganus) living in climatically distinct habitat types (inland and...

Registration Year

  • 2021

Resource Types

  • Dataset


  • United States Fish and Wildlife Service
  • United States Geological Survey
  • University of Michigan-Ann Arbor
  • Montana Fish, Wildlife & Parks
  • California Polytechnic State University
  • The Nature Conservancy
  • University of Georgia
  • Unity College
  • University of Maine
  • University of Tennessee at Knoxville