62 Works

Direction and magnitude of natural selection on body size differs among age classes of seaward migrating Pacific salmon

Marta Ulaski, Heather Finkle & Peter Westley
Due to the mediating role of body size in determining fitness, the ‘bigger is better’ hypothesis still pervades evolutionary ecology despite evidence that natural selection on phenotypic traits varies in time and space. For Pacific salmon (genus Oncorhynchus), most individual studies quantify selection across a narrow range of sizes and ages; therefore, uncertainties remain concerning how selection on size may differ among diverse life-histories. Here, we quantify the direction and magnitude of natural selection on...

Data from: Sonar estimation of summer chum and pink salmon in the Anvik River, Alaska, 2018

Naomi B. Brodersen
Dual-frequency identification sonar (DIDSON) was used to estimate adult summer chum salmon Oncorhynchus keta and pink salmon O. gorbuscha passage in the Anvik River from June 15 to July 26, 2018. Apportionment to species was determined using data collected from tower counts. A total of 305,098 (SE 5,926) summer chum and 1,122,346 (SE 7,588) pink salmon were estimated to have passed the sonar site. A beach seine sample fishery was conducted to collect age, sex,...

Data from: Survival of adult Steller sea lions in Alaska: senescence, annual variation and covariation with male reproductive success

Kelly K. Hastings, Lauri Jemison, Grey Pendleton, Lauri A. Jemison & Grey W. Pendleton
Population dynamics of long-lived vertebrates depend critically on adult survival, yet factors affecting survival and covariation between survival and other vital rates in adults remain poorly examined for many taxonomic groups of long-lived mammals (e.g. actuarial senescence has been examined for only 9 of 34 extant pinniped species using longitudinal data). We used mark-recapture models and data from 2,795 Steller sea lion (Eumetopias jubatus) pups individually-marked at 4 of 5 rookeries in southeastern Alaska (SEAK)...

Bayesian stable isotope mixing models effectively characterize the diet of an Arctic raptor

Devin Johnson, Michael Henderson, Travis Booms, Cory Williams & David Anderson
1. Bayesian stable isotope mixing models (BSIMMs) for δ13C and δ15N can be a useful tool to reconstruct diets, characterize trophic relationships, and assess spatiotemporal variation in food webs. However, use of this approach typically requires a priori knowledge on the level of enrichment occurring between the diet and tissue of the consumer being sampled (i.e., a trophic discrimination factor or TDF). 2. TDFs derived from captive feeding studies are highly variable, and it is...

Chum salmon escapement on Bonanza River in Norton Sound, Alaska

Jenefer Bell
Bonanza River flows 40 rkm south from the Kigluaik Mountains and drains into Safety Sound approximately 39 km northeast of Nome, Alaska. Chum, pink, and coho salmon are the predominant species that return to the Bonanza River. A fixed-picket weir was installed approximately 11 rkm above the Bonanza Bridge on the Nome-Council Highway (GPS coordinates 64°32.964ʹN, 164°35.812ʹW). The Bonanza River weir enumerated chum salmon for three seasons from 2018 to 2020. Chum salmon escapements were...

Staying close to home: Ecological constraints on space use and range fidelity of a mountain ungulate

Yasaman Shakeri, Kevin White & Jason Waite
Understanding patterns of animal space use and range fidelity has important implications for species and habitat conservation. For species that live in highly seasonal environments, such as mountain goats (Oreamnos americanus), spatial use patterns are expected to vary in relation to seasonal changes in environmental conditions and sex‐ or age-specific selection pressures. To address hypotheses about sex, age, and seasonality influence on space use ecology, we collected GPS location data from 263 radio‐collared mountain goats...

Data from: Trophic interactions and abiotic factors drive functional and phylogenetic structure of vertebrate herbivore communities across the Arctic tundra biome

James D.M. Speed, Ina A. Skjelbred, Isabel C. Barrio, Michael D. Martin, Dominique Berteaux, C. Guillermo Bueno, Katie S. Christie, Bruce C. Forbes, Jennifer Forbey, Daniel Fortin, Jon-Arvid Grytnes, Katrine S. Hoset, Nicolas Lecomte, Bryndis Marteinsdottir, Jesper B. Mosbacher, Åshild O. Pedersen, Virve Ravolainen, Eileen C. Rees, Anna Skarin, Natalya Sokolova, Andrew H. Thornhill, Ingunn Tombre & Eeva M. Soininen
Communities are assembled from species that evolve or colonise a given geographic region, and persist in the face of abiotic conditions and interactions with other species. The evolutionary and colonisation histories of communities are characterised by phylogenetic diversity, while functional diversity is indicative of abiotic and biotic conditions. The relationship between functional and phylogenetic diversity infers whether species functional traits are divergent (differing between related species) or convergent (similar among distantly related species). Biotic interactions...

Data and code to replicate: Diet analysis using generalized linear models derived from foraging processes using R package mvtweedie

James T. Thorson, Mayumi L. Arimitsu, Taal Levi & Gretchen H. Roffler
Diet analysis integrates a wide variety of visual, chemical and biological identification of prey. Samples are often treated as compositional data, where each prey is analyzed as a continuous percentage of the total. However, analyzing compositional data results in analytical challenges, e.g., highly parameterized models or prior transformation of data. Here, we present a novel approximation involving a Tweedie generalized linear model (GLM). We first review how this approximation emerges from considering predator foraging as...

Behavior and diet data collected from i) GPS video camera collars and ii) fecal samples collected from individuals from the Fortymile Caribou Herd

Libby Ehlers, Gabrielle Coulombe, Jim Herriges, Torsten Bentzen, Mike Suitor, Kyle Joly & Mark Hebblewhite
Summer diets are crucial for large herbivores in the subarctic and are affected by weather, harassment from insects and a variety of environmental changes linked to climate. Yet understanding foraging behavior and diet of large herbivores is challenging in the subarctic because of their remote ranges. We used GPS video-camera collars to observe behaviors and summer diets of the migratory Fortymile Caribou Herd (Rangifer tarandus granti) across Alaska, USA and the Yukon, Canada. First, we...

Sonar Estimation of Summer Chum and Pink Salmon in the Anvik River, Alaska, 2021

Naomi Brodersen
Dual-frequency identification sonar (DIDSON) was used to estimate adult summer chum salmon (Oncorhynchus keta) and pink salmon (O. gorbuscha) passage in the Anvik River from June 15 to July 26, 2021. Apportionment to species was determined from data collected from tower counts. A total of 18,819 (SE 273) summer chum and 0 pink salmon were estimated to have passed the sonar site. A beach seine sample fishery was conducted to collect age, sex, and length...

Pasagshak River Sockeye Salmon (Oncorhynchus nerka) Escapement Monitoring 2019–2021

Michelle Wattum
Since 2011, sockeye salmon (Oncorhynchus nerka) escapement through the Pasagshak River into Lake Rose Teed on the Kodiak Island road system has been estimated with a weir. A continuation of funding from the Alaska Sustainable Salmon Fund (AKSSF, Project #52009) allowed the Alaska Department of Fish and Game (ADF&G), Division of Commercial Fisheries to operate a PVC floating weir near the mouth of Lake Rose Teed during the 2019 through 2021 seasons. This data set...

Canis lupus fecal DNA dataset

Gretchen Roffler
Sea otters (Enhydra lutris) and wolves (Canis lupus) are two apex predators with strong and cascading effects on ecosystem structure and function. After decades of recovery from near extirpation, their ranges now overlap, allowing sea otters and wolves to interact for the first time in the scientific record. We intensively studied wolves during 2015–2021 in an island system colonized by sea otters in the 2000s and by wolves in 2013. After wolf colonization, we quantified...

Registration Year

  • 2023
  • 2022
  • 2021
  • 2020
  • 2019
  • 2018
  • 2017
  • 2016
  • 2015
  • 2014

Resource Types

  • Dataset


  • Alaska Department of Fish and Game
  • University of Washington
  • University of Alaska Fairbanks
  • Alaska Fisheries Science Center
  • University of Alaska System
  • National Marine Fisheries Service
  • National Park Service
  • United States Fish and Wildlife Service
  • Oregon State University
  • University of Wyoming