Browsing USN Open Archive by Author "Sergiel, Agnieszka"

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Compatibility of preparatory procedures for the analysis of cortisol concentrations and stable isotope (δ13C, δ15N) ratios: a test on brown bear hair

Sergiel, Agnieszka; Hobson, Keith A.; Janz, David M.; Cattet, Marc; Selva, Nuria; Kapronczai, Luciene; Gryba, Chantel; Zedrosser, Andreas (Journal article; Peer reviewed, 2017)

The measurement of naturally occurring glucocorticoids and stable isotopes of several elements has gained importance in wildlife studies in recent decades and opened a myriad of ecological applications. Cortisol and stable ...
Correcting for enzyme immunoassay changes in long term monitoring studies

Wilson, Abbey E.; Sergiel, Agnieszka; Selva, Nuria; Swenson, Jon; Zedrosser, Andreas; Stenhouse, Gordon; Janz, David M. (Peer reviewed; Journal article, 2021)

Enzyme immunoassays (EIAs) are a common tool for measuring steroid hormones in wildlife due to their low cost, commercial availability, and rapid results. Testing technologies improve continuously, sometimes requiring ...
Testing foraging optimization models in brown bears: Time for a paradigm shift in nutritional ecology?

Mikkelsen, Ashlee J.; Hobson, Keith A.; Sergiel, Agnieszka; Hertel, Anne G.; Selva, Nuria; Zedrosser, Andreas (Peer reviewed; Journal article, 2023)

How organisms obtain energy to survive and reproduce is fundamental to ecology, yet researchers use theoretical concepts represented by simplified models to estimate diet and predict community interactions. Such simplistic ...