121 Works

In the News

Jason Matthews & Joe N. Caudell
Items in the news.

Data from: Body condition explains migratory performance of a long-distance migrant

Sjoerd Duijns, Lawrence J. Niles, Amanda Dey, Yves Aubry, Christian Friis, Stephanie Koch, Alexandra M. Anderson & Paul A. Smith
Body condition (i.e. relative mass after correcting for structural size) affects the behaviour of migrating birds, but how body condition affects migratory performance, timing and fitness is still largely unknown. Here, we studied the effects of relative body condition on individual departure decisions, wind selectivity, flight speed and timing of migration for a long-distance migratory shorebird, the red knot Calidris canutus rufa. By using automated VHF telemetry on a continental scale, we studied knots' migratory...

Data from: Return of a giant: DNA from archival museum samples helps to identify a unique cutthroat trout lineage formerly thought to be extinct

Mary M. Peacock, Evon R. Hekkala, Veronica S. Kirchoff & Lisa G. Heki
Currently one small, native population of the culturally and ecologically important Lahontan cutthroat trout (Oncorhynchus clarkii henshawi, LCT, Federally listed) remains in the Truckee River watershed of northwestern Nevada and northeastern California. The majority of populations in this watershed were extirpated in the 1940’s due to invasive species, overharvest, anthropogenic water consumption and changing precipitation regimes. In 1977, a population of cutthroat trout discovered in the Pilot Peak Mountains in the Bonneville basin of Utah,...

Data from: Influence of introduction history on genetic variation in introduced populations: a case study of Oregon Chub

Patrick W. DeHaan, Brice A. Adams, Paul D. Scheerer & Brian L. Bangs
Population introductions and reintroductions have become a common tool for conserving threatened species, but oftentimes introduced populations have reduced the genetic diversity compared with the source population they were founded from. Population introductions played an important role in the recovery of the Oregon Chub Oregonichthys crameri, a small floodplain minnow found in western Oregon. Unlike many introduction efforts, introduced populations of Oregon Chub were founded using large numbers of individuals (hundreds in many cases) and...

Data from: Consumption explains intraspecific variation in nutrient recycling stoichiometry in a desert fish

Eric K. Moody, Evan W. Carson, Jessica R. Corman, Hector Espinosa-Pérez, Jorge Ramos, John L. Sabo & James J. Elser
Consumer-driven nutrient recycling can have substantial effects on primary production and patterns of nutrient limitation in aquatic ecosystems by altering the rates as well as the relative supplies of the key nutrients nitrogen (N) and phosphorus (P). While variation in nutrient recycling stoichiometry has been well-studied among species, the mechanisms that explain intraspecific variation in recycling N:P are not well-understood. We examined the relative importance of potential drivers of variation in nutrient recycling by the...

Data from: Plasticity in nesting adaptations of a tidal marsh endemic bird

Bri Benvenuti, Jennifer Walsh, Kathleen M. O'Brien & Adrienne I. Kovach
If individuals can perceive and manage risks, they may alter their behaviors based on prior experience. This expectation may apply to nest site selection of breeding birds, for which adaptive behavioral responses may enhance fitness. Birds that nest in tidal marshes have adapted to the challenges posed primarily by periodic, monthly tidal flooding and secondarily, by predation. We investigated adaptive responses in nesting behavior of the saltmarsh sparrow (Ammodramus caudacutus), an obligate tidal-marsh-breeding bird, using...

Data from: Patterns of intra- and inter-population genetic diversity in Alaskan coho salmon: implications for conservation

Jeffrey B Olsen, Steve J Miller, William J Spearman & John K Wenburg
Little is known about the genetic diversity of coho salmon in Alaska, although this area represents half of the species’ North American range. In this study, nine microsatellite loci were used to genotype 32 putative coho salmon populations from seven regions of Alaska. The primary objectives were to estimate and evaluate the degree and spatial distribution of neutral genetic diversity within and among populations of Alaskan coho salmon. Genetic analysis yielded four results that provide...

Data from: Disentangling density-dependent dynamics using full annual cycle models and Bayesian model weight updating

Orin J. Robinson, Conor P. McGowan & Patrick K. Devers
Density dependence regulates populations of many species across all taxonomic groups. Understanding density dependence is vital for predicting the effects of climate, habitat loss and/or management actions on wild populations. Migratory species likely experience seasonal changes in the relative influence of density dependence on population processes such as survival and recruitment throughout the annual cycle. These effects must be accounted for when characterizing migratory populations via population models. To evaluate effects of density on seasonal...

Data from: Increased land use by Chukchi Sea polar bears in relation to changing sea ice conditions

Karyn D. Rode, Ryan R. Wilson, Eric V. Regehr, Michelle St. Martin, David C. Douglas & Jay Olson
Recent observations suggest that polar bears (Ursus maritimus) are increasingly using land habitats in some parts of their range, where they have minimal access to their preferred prey, likely in response to loss of their sea ice habitat associated with climatic warming. We used location data from female polar bears fit with satellite radio collars to compare land use patterns in the Chukchi Sea between two periods (1986–1995 and 2008–2013) when substantial summer sea-ice loss...

Data from: Genetic composition of the Warm Springs River Chinook Salmon population maintained following eight generations of hatchery production

Christian T. Smith, Rod French, Jens Lovtang & David Hand
Balancing the disparate objectives of fishery augmentation and conservation of an endemic population presents a substantial challenge. In the case of Warm Springs National Fish Hatchery (Warm Springs Hatchery), strategies for achieving both objectives included incorporation of natural fish into the hatchery broodstock and restricting proportions of hatchery fish on the spawning grounds. The hatchery has been more successful in implementing the latter, however, than the former. We analyzed seventy-six SNP markers in Spring Chinook...

Data from: Targeted reforestation could reverse declines in connectivity for understory birds in a tropical habitat corridor

Matthew E. Fagan, Ruth S. DeFries, Steven E. Sesnie, J. Pablo Arroyo-Mora & Robin L. Chazdon
Re-establishing connectivity between protected areas isolated by habitat clearing is a key conservation goal in the humid tropics. In northeastern Costa Rica, payments for environmental services (PES) and a government ban on deforestation have subsidized forest protection and reforestation in the San Juan–La Selva Biological Corridor (SJLSBC), resulting in a decline in mature forest loss and the expansion of tree plantations. We use field studies and graph models to assess how conservation efforts have altered...

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...

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...

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...

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...

Data from: Overlap of spatial and temporal spawning distributions of spring and summer Chinook Salmon results in hybridization in the upper Columbia River

Gregory Fraser, Patrick DeHaan, Christian Smith, Jennifer Von Bargen, Mathew Cooper & Thomas Desgrosseillier
The upper Columbia River in Washington State (main-stem and tributary habitat between McNary and Chief Joseph dams) is inhabited by two major lineages of Chinook Salmon (Oncorhynchus tshawytscha); endangered spring Chinook Salmon and summer Chinook Salmon which are not ESA listed. The lineages are highly genetically divergent from one another and historically spatial and temporal isolating mechanisms maintained these genetic differences. Both lineages occur in the Entiat River, a system where anthropogenic activity has changed...

Proximity to oil wells in North Dakota does not impact nest success of ducks but lowers nest densities

Kevin Ringelman, Cassandra Skaggs, Charles Loesch, Michael Szymanski, Frank Rohwer & Kaylan Kemink
Over the past decade, the United States has seen a rapid increase in oil and gas extraction from areas where resources were previously thought to be unrecoverable, particularly the Bakken shale formation in North Dakota. The Bakken overlaps with the Prairie Pothole Region, the most critical habitat in North America for breeding ducks, where oil and gas extraction through hydraulic fracturing has the potential to impact more than a million duck pairs in the United...

Submerged aquatic vegetation, water quality (pH, salinity, and turbidity) and waterfowl abundance data from 1991-2017 in Back Bay, Virginia

Carly Sibilia, Jesús Aguirre-Gutiérrez, Lauren Mowbray & Yadvinder Malhi
Back Bay, Virginia, has been documented as an important foraging area for waterfowl since at least the mid-1800s. Expansive submerged plant beds historically supported diverse assemblages of non-breeding waterfowl, however coastal development and other anthropogenic influences have since led to fluctuations in submerged aquatic vegetation (SAV) and an associated decline in waterfowl abundance in the bay. To gain insight into the effects of environmental drivers on waterfowl foraging guilds, our study explores the effects of...

Climate change and lithium mining influence flamingo abundance in the Lithium Triangle

Jorge Gutiérrez, Johnnie Moore, Patrick Donnelli, Cristina Dorador, Juan Navedo & Nathan Senner
The development of technologies to slow climate change has been identified as a global imperative. Nonetheless, such ‘green’ technologies can potentially have negative impacts on biodiversity. We explored how climate change and the mining of lithium for green technologies influence surface water availability, primary productivity, and the abundance of three threatened and economically important flamingo species in the ‘Lithium Triangle’ of the Chilean Andes. We combined climate and primary productivity data with remotely sensed measures...

Can at-risk species serve as effective conservation surrogates? Case study in northeastern US shrublands

Melissa Bauer, Kathleen O'Brien & Adrienne Kovach
Targeted, single-species management and ecosystem-based management are generally considered disparate conservation approaches. In imperiled ecosystems, these approaches may be complementary, when habitat management for targeted at-risk species provides broad ecosystem benefits through an umbrella or surrogate species effect. In the northeastern United States, extensive management has been ongoing since 2011 to restore declining habitat for an at-risk shrubland habitat specialist, the New England cottontail (Sylvilagus transitionalis), with the goal that other shrubland-obligate wildlife will also...

Data from: An isolated white-tailed deer (Odocoileus virginianus) population on St. John, US Virgin Islands shows low inbreeding and comparable heterozygosity to other larger populations

Scott Taylor, Suzanne Nelson & Jon Reuter
This is the first study to document the genetic diversity of the white-tailed deer population on St. John, US Virgin Islands. The island population was founded by a small number of animals, has very limited hunting or predation, and recently experienced a reduction in size following an extended drought in 2015. DNA samples were collected from hair from 23 anesthetized adult deer (13 males, 10 females) ranging in age from 1-8 years (3.36+ 1.9 yr)...

Data from: Variation in age ratio of midcontinent greater white-fronted geese during fall migration

Wade G. Schock, Julian B. Fischer, Craig R. Ely, Robert A. Stehn, Jeffrey M. Welker & Douglas Causey
Annual productivity is an important parameter for the management of waterfowl populations. Fall age ratio (juveniles:total birds) is an index of productivity of the preceding breeding season. However, differences in the timing of migration between family groups and nonbreeding birds may bias age-ratio estimates. We examined temporal variation in age ratios of midcontinent greater white-fronted geese Anser albifrons frontalis from interior and northwestern Alaska at a northern autumn staging area near Delta Junction, Alaska. Photographic...

Data from: Fire and non-native grass invasion interact to suppress tree regeneration in temperate deciduous forests

S. Luke Flory, Keith Clay, Sarah M. Emery, Joseph R. Robb & Brian Winters
1. While many ecosystems depend on fire to maintain biodiversity, non-native plant invasions can enhance fire intensity, suppressing native species and generating a fire–invasion feedback. These dynamics have been observed in arid and semi-arid ecosystems, but fire–invasion interactions in temperate deciduous forests, where prescribed fires are often used as management tools to enhance native diversity, have rarely been investigated. 2. Here we evaluated the effects of a widespread invasive grass on fire behaviour in eastern...

Data from: Limited hatchery introgression into wild brook trout (Salvelinus fontinalis) populations despite reoccurring stocking

Shannon L. White, William L. Miller, Stephanie A. Dowell, Meredith L. Bartron & Tyler Wagner
Due to increased anthropogenic pressures on many fish populations, supplementing wild populations with captive-raised individuals has become an increasingly common management practice. Stocking programs can be controversial due to uncertainty about the long-term fitness effects of genetic introgression on wild populations. In particular, introgression between hatchery and wild individuals can cause declines in wild population fitness, resiliency, and adaptive potential, and contribute to local population extirpation. However, low survival and fitness of captive-raised individuals can...

Data from: Phylogenetics support an ancient common origin of two scientific icons: Devils Hole and Devils Hole pupfish

İsmail K. Sağlam, Jason Baumsteiger, Matt J. Smith, Javier Linares-Casenave, Andrew L. Nichols, Sean M. O'Rourke & Michael R. Miller
The Devils Hole pupfish (Cyprinodon diabolis; DHP) is an icon of conservation biology. Isolated in a 50 m2 pool (Devils Hole), DHP is one of the rarest vertebrate species known and an evolutionary anomaly, having survived in complete isolation for thousands of years. However, recent findings suggest DHP might be younger than commonly thought, potentially introduced to Devils Hole by humans in the past thousand years. As a result, the significance of DHP from an...

Registration Year

  • 2022
    9
  • 2021
    16
  • 2020
    23
  • 2019
    8
  • 2018
    14
  • 2017
    13
  • 2016
    14
  • 2015
    5
  • 2014
    10
  • 2013
    3

Resource Types

  • Dataset
    117
  • Text
    4

Affiliations

  • United States Fish and Wildlife Service
    121
  • United States Geological Survey
    23
  • University of Minnesota
    4
  • University of Maine
    4
  • University of Nevada Reno
    4
  • University of New Hampshire
    4
  • Colorado State University
    4
  • US Forest Service
    4
  • University of Maryland, College Park
    4
  • University of Montana
    3