8 Works

Individual-Based-Model used in \"Population context matters: predicting effects of metabolic stress mediated by food availability and predation with an agent- and energy budget-based model\"

Maxime Vaugeois, Valery E Forbes, Paul A Venturelli, Chiara Accolla & Stephanie L Hummel
This is the programming software code of the model developed to investigate the population-level impacts of a hypothetical, sublethal stressor that can affect an individual’s metabolism (growth, reproduction, maintenance, or assimilation) in systems in which population size is controlled by different combinations of food availability and predation pressure. The life cycle of fathead minnow (Pimephales promelas) is describe through their metabolism, using the Dynamic Energy Budget theory (DEB) and we represent the populations through an...

Unnatural selection of salmon life histories in a modified riverscape

Anna M. Sturrock, Stephanie M. Carlson, John D. Wikert, Tim Heyne, Sébastien Nusslé, Joseph E. Merz, Hugh J. W. Sturrock & Rachel C. Johnson
Altered river flows and fragmented habitats often simplify riverine communities and favor non‐native fishes, but their influence on life‐history expression and survival is less clear. Here, we quantify the expression and ultimate success of diverse salmon emigration behaviors in an anthropogenically altered California river system. We analyzed two decades of Chinook salmon monitoring data to explore the influence of regulated flows on juvenile emigration phenology, abundance, and recruitment. We then followed seven cohorts into adulthood...

Data from: Genetic structure and the history of chub in the Alvord Basin

Christian T. Smith, Jennifer Von Bargen, Patrick W. DeHaan, Paul Scheerer & Michael H. Meeuwig
Knowledge of the distribution of genetic resources within and among taxa is prerequisite for development of management strategies which facilitate conservation of those resources. We used restriction-site associated DNA (RAD) sequencing to survey genetic variation in Alvord Chub and Borax Lake Chub from the Alvord Basin in southeastern Oregon and northern Nevada, USA. Our specific goals were to gain an understanding of the population genetic structure of Alvord Chub and the relationship between this species...

Persistence of an endangered native duck, feral mallards, and multiple hybrid swarms across the main Hawaiian Islands

Caitlin Wells, Philip Lavretsky, Michael Sorenson, Jeffrey Peters, Jeffrey DaCosta, Stephen Turnbull, Kimberly Uyehara, Christopher Malachowski, Bruce Dugger, John Eadie & Andrew Engilis
Interspecific hybridization is recognized as an important process in the evolutionary dynamics of both speciation and the reversal of speciation. However, our understanding of the spatial and temporal patterns of hybridization that erode versus promote species boundaries is incomplete. The endangered, endemic koloa maoli (or Hawaiian duck, Anas wyvilliana) is thought to be threatened with genetic extinction through ongoing hybridization with an introduced congener, the feral mallard (A. platyrhynchos). We investigated spatial and temporal variation...

An analysis of avian vocal performance at the note and song levels

David Logue, Jacob Sheppard, Bailey Walton, Benjamin Brinkman & Orlando Medina
Sexual displays that require extreme feats of physiological performance have the potential to reliably indicate the signaller’s skill or motivation. We tested for evidence of performance constraints in Adelaide’s warblers (Setophaga adelaidae) songs. At the note level, we identified three trade-offs with well-defined limits. At the song level, we identified two trade-offs, but their limits were less well-defined than the note-level limits. Trade-offs at both levels suggest that song structure is constrained by limits to...

Data from: Chronology of reproductive investment determines predation risk aversion in a felid-ungulate system

Daniel Crawford, Michael J Cherry, Brian D Kelly, Elina P Garrison, David Shindle, L Mike Conner, Richard B Chandler & Karl V Miller
Fear of predators can behaviorally mediate prey population dynamics, particularly when predation risk influences reproductive investment. However, the costs of reproductive investment may mitigate predation risk aversion relative to periods when the link between reproductive output and prey behavior is weaker. We posit that intensity of reproductive investment in ungulates may predict their response to predation risk such that the sexes increase risk exposure during biological seasons that are pivotal to reproductive success, such as...

Data from: Using citizen-science observations to understand long-term trends in common and Pacific loon populations in urbanized Southcentral Alaska

Laura A. McDuffie, Julie C. Hagelin, Marian L. Snively, Grey W. Pendleton & Audrey R. Taylor
For over 30 years, the Alaska Loon Watch (1985−1999) and the Alaska Loon and Grebe Watch (2000−2015) engaged citizen scientist participants to record over 10,000 observations of common Gavia immer and Pacific loons Gavia pacifia at 346 lakes in five sub-regions of Southcentral Alaska. We used generalized linear mixed models to estimate long-term trends in adult loon counts and chick survival and examined environmental variables associated with loon abundance. Adult common loon counts increased in...

Data from: Integrated modeling predicts shifts in waterbird population dynamics under climate change

Qing Zhao, G. Scott Boomer & J. Andrew Royle
Climate change has been identified as one of the most important drivers of wildlife population dynamics. The in-depth knowledge of the complex relationships between climate and population sizes through density dependent demographic processes is important for understanding and predicting population shifts under climate change, which requires integrated population models (IPMs) that unify the analyses of demography and abundance data. In this study we developed an IPM based on Gaussian approximation to dynamic N-mixture models for...

Registration Year

  • 2019
    8

Resource Types

  • Dataset
    8

Affiliations

  • United States Fish and Wildlife Service
    8
  • Colorado State University
    2
  • University of California, Davis
    2
  • Ball State University
    1
  • University of Georgia
    1
  • Oregon Department of Fish and Wildlife
    1
  • Oregon State University
    1
  • University of Minnesota
    1
  • University of California, Berkeley
    1
  • Gabriel René Moreno Autonomous University
    1