Nathan J. Hostetter
Patuxent Wildlife Research Center
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Publications 10
#1N. A. LloydH-Index: 1
#2Nathan J. Hostetter (Patuxent Wildlife Research Center)H-Index: 5
Last. Axel MoehrenschlagerH-Index: 6
view all 5 authors...
5 CitationsSource
#1Eric V. Regehr (UW: University of Washington)H-Index: 18
#2Nathan J. Hostetter (Patuxent Wildlife Research Center)H-Index: 5
Last. Sarah J. Converse (UW: University of Washington)H-Index: 21
view all 6 authors...
Large carnivores are imperiled globally, and characteristics making them vulnerable to extinction (e.g., low densities and expansive ranges) also make it difficult to estimate demographic parameters needed for management. Here we develop an integrated population model to analyze capture-recapture, radiotelemetry, and count data for the Chukchi Sea subpopulation of polar bears (Ursus maritimus), 2008–2016. Our model addressed several challenges in capture-recapture studies for polar bears by incl...
4 CitationsSource
#1William A. Link (USGS: United States Geological Survey)H-Index: 39
#2Sarah J. Converse (UW: University of Washington)H-Index: 21
Last. Nathan J. Hostetter (USGS: United States Geological Survey)H-Index: 5
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In capture-mark-reencounter studies, Pollock’s robust design combines methods for open populations with methods for closed populations. Open population features of the robust design allow for estimation of rates of death or permanent emigration, and closed population features enhance estimation of population sizes. We describe a similar design, but for use with removal data. Data collection occurs on secondary sampling occasions clustered within primary sampling periods. Primary sampling periods...
AbstractTrait-selective mortality is of considerable management and conservation interest, especially when trends are similar across multiple species of conservation concern. In the Columbia River basin, thousands of juvenile Pacific salmonids Oncorhynchus spp. are collected each year and are tagged at juvenile bypass system (JBS) facilities located at hydroelectric dams, thus allowing the tracking of population-level performance metrics (e.g., juvenile survival and juvenile-to-adult survival). ...
2 CitationsSource
AbstractAccurate assessment of specific mortality factors is vital to prioritize recovery actions for threatened and endangered species. For decades, tag recovery methods have been used to estimate fish mortality due to avian predation. Predation probabilities derived from fish tag recoveries on piscivorous waterbird colonies typically reflect minimum estimates of predation due to an unknown and unaccounted-for fraction of tags that are consumed but not deposited on-colony (i.e., deposition prob...
14 CitationsSource
#1Jessica Y. Adkins (OSU: Oregon State University)H-Index: 5
#2Donald E. Lyons (OSU: Oregon State University)H-Index: 14
Last. Nathan J. HostetterH-Index: 5
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We investigated colony size, productivity, and limiting factors for five piscivorous waterbird species nesting at 18 locations on the Columbia Plateau (Washington) during 2004–2010 with emphasis on species with a history of salmonid (Oncorhynchus spp.) depredation. Numbers of nesting Caspian terns (Hydroprogne caspia) and double-crested cormorants (Phalacrocorax auritus) were stable at about 700–1,000 breeding pairs at five colonies and about 1,200–1,500 breeding pairs at four colonies, respecti...
5 CitationsSource
Abstract Identification of the factors that influence susceptibility to predation can aid in developing management strategies to recover fish populations of conservation concern. Predator–prey relationships can be influenced by numerous factors, including prey condition, prey size, and environmental conditions. We investigated these factors by using juvenile steelhead Oncorhynchus mykiss from the Snake River (Pacific Northwest, USA), a distinct population segment that is listed as threatened und...
30 CitationsSource
Abstract We recovered passive integrated transponder (PIT) tags from nine piscivorous waterbird colonies in the Columbia River basin to evaluate avian predation on Endangered Species Act (ESA)-listed salmonid Oncorhynchus spp. populations during 2007–2010. Avian predation rates were calculated based on the percentage of PIT-tagged juvenile salmonids that were detected as passing hydroelectric dams and subsequently were consumed and deposited by birds on their nesting colonies. Caspian terns Hydr...
36 CitationsSource
#1Ken CollisH-Index: 16
#2Daniel D. Roby (USGS: United States Geological Survey)H-Index: 30
Last. Allison G. L. Patterson (OSU: Oregon State University)H-Index: 2
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Abstract. Colony size, nesting ecology and diet of Caspian Terns (Hydroprogne caspia) were investigated in the San Francisco Bay area (SFBA) during 2003–2009 to assess the potential for conservation of the tern breeding population and possible negative effects of predation on survival of juvenile salmonids (Oncorhynchus spp.). Numbers of breeding Caspian Terns declined 36% from 2003 to 2009, mostly due to abandonment of the Knight Island colony and decline of the Brooks Island colony, the two la...
3 CitationsSource
#1Nathan J. Hostetter (USGS: United States Geological Survey)H-Index: 5
#2Allen F. EvansH-Index: 14
Last. Frank J. LogeH-Index: 29
view all 8 authors...
Abstract Understanding how the external condition of juvenile salmonids is associated with internal measures of health and subsequent out-migration survival can be valuable for population monitoring programs. This study investigated the use of a rapid, nonlethal, external examination to assess the condition of run-of-the-river juvenile steelhead Oncorhynchus mykiss migrating from the Snake River to the Pacific Ocean. We compared the external condition (e.g., body injuries, descaling, external si...
16 CitationsSource