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Select item 106565521.

Multi-omics for studying and understanding polar life

M. S. Clark, J. I. Hoffman, L. S. Peck, L. Bargelloni, D. Gande, C. Havermans, B. Meyer, T. Patarnello, T. Phillips, K. R. Stoof-Leichsenring, D. L. J. Vendrami, A. Beck, G. Collins, M. W. Friedrich, K. M. Halanych, J. F. Masello, R. Nagel, K. Norén, C. Printzen, M. B. Ruiz, S. Wohlrab, B. Becker, K. Dumack, F. Ghaderiardakani, K. Glaser, S. Heesch, C. Held, U. John, U. Karsten, S. Kempf, M. Lucassen, A. Paijmans, K. Schimani, A. Wallberg, L. C. Wunder, T. Mock

Nat Commun. 2023; 14: 7451. Published online 2023 Nov 17. doi: 10.1038/s41467-023-43209-y

PMCID:: PMC10656552

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Select item 73175972.

Kristin L. Laidre, Stephen Atkinson, Eric V. Regehr, Harry L. Stern, Erik W. Born, Øystein Wiig, Nicholas J. Lunn, Markus Dyck

Ecol Appl. 2020 Jun; 30(4): e02071. Published online 2020 Feb 4. doi: 10.1002/eap.2071

PMCID:: PMC7317597

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Select item 60186673.

Aquatic behaviour of polar bears (Ursus maritimus) in an increasingly ice-free Arctic

Karen Lone, Kit M. Kovacs, Christian Lydersen, Mike Fedak, Magnus Andersen, Philip Lovell, Jon Aars

Sci Rep. 2018; 8: 9677. Published online 2018 Jun 26. doi: 10.1038/s41598-018-27947-4

PMCID:: PMC6018667

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Select item 81017514.

Aerial survey estimates of polar bears and their tracks in the Chukchi Sea

Paul B. Conn, Vladimir I. Chernook, Erin E. Moreland, Irina S. Trukhanova, Eric V. Regehr, Alexander N. Vasiliev, Ryan R. Wilson, Stanislav E. Belikov, Peter L. Boveng

PLoS One. 2021; 16(5): e0251130. Published online 2021 May 6. doi: 10.1371/journal.pone.0251130

PMCID:: PMC8101751

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Select item 98464795.

The Resilience of Polar Collembola (Springtails) in a Changing Climate

Clare R. Beet, Ian D. Hogg, S. Craig Cary, Ian R. McDonald, Brent J. Sinclair

Curr Res Insect Sci. 2022; 2: 100046. Published online 2022 Sep 11. doi: 10.1016/j.cris.2022.100046

PMCID:: PMC9846479

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Select item 65027996.

Environmental contaminants modulate the transcriptional activity of polar bear (Ursus maritimus) and human peroxisome proliferator-activated receptor alpha (PPARA)

Heli Routti, Mari K. Berg, Roger Lille-Langøy, Lene Øygarden, Mikael Harju, Rune Dietz, Christian Sonne, Anders Goksøyr

Sci Rep. 2019; 9: 6918. Published online 2019 May 6. doi: 10.1038/s41598-019-43337-w

PMCID:: PMC6502799

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Select item 48040007.

Demographic and traditional knowledge perspectives on the current status of Canadian polar bear subpopulations

Jordan York, Martha Dowsley, Adam Cornwell, Miroslaw Kuc, Mitchell Taylor

Ecol Evol. 2016 May; 6(9): 2897–2924. Published online 2016 Mar 23. doi: 10.1002/ece3.2030

PMCID:: PMC4804000

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Select item 90473048.

Metagenome-assembled genomes of phytoplankton microbiomes from the Arctic and Atlantic Oceans

Anthony Duncan, Kerrie Barry, Chris Daum, Emiley Eloe-Fadrosh, Simon Roux, Katrin Schmidt, Susannah G. Tringe, Klaus U. Valentin, Neha Varghese, Asaf Salamov, Igor V. Grigoriev, Richard M. Leggett, Vincent Moulton, Thomas Mock

Microbiome. 2022; 10: 67. Published online 2022 Apr 28. doi: 10.1186/s40168-022-01254-7

PMCID:: PMC9047304

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Select item 100376759.

The Function and Structure of the Microsporidia Polar Tube

Bing Han, Peter M. Takvorian, Louis M. Weiss

Exp Suppl. Author manuscript; available in PMC 2023 Mar 24.

Published in final edited form as: Exp Suppl. 2022; 114: 179–213. doi: 10.1007/978-3-030-93306-7_8

PMCID:: PMC10037675

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Select item 743791810.

Identifying reliable indicators of fitness in polar bears

Karyn D. Rode, Todd C. Atwood, Gregory W. Thiemann, Michelle St. Martin, Ryan R. Wilson, George M. Durner, Eric V. Regehr, Sandra L. Talbot, George K. Sage, Anthony M. Pagano, Kristin S. Simac

PLoS One. 2020; 15(8): e0237444. Published online 2020 Aug 19. doi: 10.1371/journal.pone.0237444

PMCID:: PMC7437918

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Select item 675021911.

Polar Ocean Observations: A Critical Gap in the Observing System and Its Effect on Environmental Predictions From Hours to a Season

Gregory C. Smith, Richard Allard, Marcel Babin, Laurent Bertino, Matthieu Chevallier, Gary Corlett, Julia Crout, Fraser Davidson, Bruno Delille, Sarah T. Gille, David Hebert, Patrick Hyder, Janet Intrieri, José Lagunas, Gilles Larnicol, Thomas Kaminski, Belinda Kater, Frank Kauker, Claudie Marec, Matthew Mazloff, E. Joseph Metzger, Calvin Mordy, Anne O’Carroll, Steffen M. Olsen, Michael Phelps, Pamela Posey, Pierre Prandi, Eric Rehm, Phillip Reid, Ignatius Rigor, Stein Sandven, Matthew Shupe, Sebastiaan Swart, Ole Martin Smedstad, Amy Solomon, Andrea Storto, Pierre Thibaut, John Toole, Kevin Wood, Jiping Xie, Qinghua Yang, WWRP PPP Steering Group

Front Mar Sci. Author manuscript; available in PMC 2019 Sep 18.

Published in final edited form as: Front Mar Sci. 2019 Aug 6; 6: 10.3389/fmars.2019.00429. doi: 10.3389/fmars.2019.00429

PMCID:: PMC6750219

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Select item 921448812.

Insights into bear evolution from a Pleistocene polar bear genome

Tianying Lan, Kalle Leppälä, Crystal Tomlin, Sandra L. Talbot, George K. Sage, Sean D. Farley, Richard T. Shideler, Lutz Bachmann, Øystein Wiig, Victor A. Albert, Jarkko Salojärvi, Thomas Mailund, Daniela I. Drautz-Moses, Stephan C. Schuster, Luis Herrera-Estrella, Charlotte Lindqvist

Proc Natl Acad Sci U S A. 2022 Jun 14; 119(24): e2200016119. Published online 2022 Jun 6. doi: 10.1073/pnas.2200016119

PMCID:: PMC9214488

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Select item 842435313.

Sea ice reduction drives genetic differentiation among Barents Sea polar bears

Simo Njabulo Maduna, Jon Aars, Ida Fløystad, Cornelya F. C. Klütsch, Eve M. L. Zeyl Fiskebeck, Øystein Wiig, Dorothee Ehrich, Magnus Andersen, Lutz Bachmann, Andrew E. Derocher, Tommi Nyman, Hans Geir Eiken, Snorre B. Hagen

Proc Biol Sci. September 8, 2021; 288(1958): 20211741. Published online September 8, 2021. doi: 10.1098/rspb.2021.1741

PMCID:: PMC8424353

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Select item 932415514.

The acute physiological response of polar bears to helicopter capture

John P. Whiteman, Henry J. Harlow, George M. Durner, Eric V. Regehr, Steven C. Amstrup, Anthony M. Pagano, Merav Ben‐David

J Wildl Manage. 2022 Jul; 86(5): e22238. Published online 2022 Apr 29. doi: 10.1002/jwmg.22238

PMCID:: PMC9324155

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Select item 928653315.

Demographic risk assessment for a harvested species threatened by climate change: polar bears in the Chukchi Sea

Eric V. Regehr, Michael C. Runge, Andrew Von Duyke, Ryan R. Wilson, Lori Polasek, Karyn D. Rode, Nathan J. Hostetter, Sarah J. Converse

Ecol Appl. 2021 Dec; 31(8): e02461. Published online 2021 Oct 26. doi: 10.1002/eap.2461

PMCID:: PMC9286533

Article PDF–671K

Select item 595392616.

Quantifying climate feedbacks in polar regions

Hugues Goosse, Jennifer E. Kay, Kyle C. Armour, Alejandro Bodas-Salcedo, Helene Chepfer, David Docquier, Alexandra Jonko, Paul J. Kushner, Olivier Lecomte, François Massonnet, Hyo-Seok Park, Felix Pithan, Gunilla Svensson, Martin Vancoppenolle

Nat Commun. 2018; 9: 1919. Published online 2018 May 15. doi: 10.1038/s41467-018-04173-0

PMCID:: PMC5953926

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Select item 845712517.

Long‐term increases in pathogen seroprevalence in polar bears (Ursus maritimus) influenced by climate change

Nicholas W. Pilfold, Evan S. Richardson, John Ellis, Emily Jenkins, W. Brad Scandrett, Adrián Hernández‐Ortiz, Kayla Buhler, David McGeachy, Batol Al‐Adhami, Kelly Konecsni, Vladislav A. Lobanov, Megan A. Owen, Bruce Rideout, Nicholas J. Lunn

Glob Chang Biol. 2021 Oct; 27(19): 4481–4497. Published online 2021 Jul 22. doi: 10.1111/gcb.15537

PMCID:: PMC8457125

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Select item 581713218.

Range contraction and increasing isolation of a polar bear subpopulation in an era of sea‐ice loss

Kristin L. Laidre, Erik W. Born, Stephen N. Atkinson, Øystein Wiig, Liselotte W. Andersen, Nicholas J. Lunn, Markus Dyck, Eric V. Regehr, Richard McGovern, Patrick Heagerty

Ecol Evol. 2018 Feb; 8(4): 2062–2075. Published online 2018 Jan 18. doi: 10.1002/ece3.3809

PMCID:: PMC5817132

Article PDF–972K

Select item 894456019.

The Adrenal Cortisol Response to Increasing Ambient Temperature in Polar Bears (Ursus maritimus)

Emily M. Leishman, Maria Franke, Jill Marvin, Dylan McCart, Carol Bradford, Zoltan S. Gyimesi, Anne Nichols, Marie-Pierre Lessard, David Page, C-Jae Breiter, Laura H. Graham

Animals (Basel) 2022 Mar; 12(6): 672. Published online 2022 Mar 8. doi: 10.3390/ani12060672

PMCID:: PMC8944560

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Select item 801904920.

Modeling the demography of species providing extended parental care: A capture–recapture multievent model with a case study on polar bears (Ursus maritimus)

Sarah Cubaynes, Jon Aars, Nigel G. Yoccoz, Roger Pradel, Øystein Wiig, Rolf A. Ims, Olivier Gimenez

Ecol Evol. 2021 Apr; 11(7): 3380–3392. Published online 2021 Mar 10. doi: 10.1002/ece3.7296

PMCID:: PMC8019049

Article PDF–906K

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PMC Images search for polar year

Figure 1

Autosomal dominant congenital cataract phenotypes. (a) Slit lamp and retroillumination view of anterior polar cataract (47 year old woman). (b) Slit lamp and retroillumination view of a stationary posterior polar cataract (49 year old woman). (c) Slit lamp view of a progressive posterior polar cataract (9 year old female). (d) Slit lamp and retroillumination view of a dense nuclear cataract (14 year old male). (e) Slit lamp and retroillumination view of nuclear opacities (50 year old woman). (f) Slit lamp and retroillumination view of the Coppock-like cataract with fine nuclear opacities (24 year old woman). (g) Slit lamp and retroillumination view of the Coppock-like cataract with dense central opacities (6 year old female). (h) Slit lamp view of lamellar cataract. (i) Slit lamp view of a blue dot (cerulean) cataract (32 year old man). (j) Slit lamp and retroillumination view of a cortical cataract (45 year old woman). (k) Slit lamp view of a fine pulverulent cataract (32 year old man). (l) Slit lamp view of large pulverulent opacities (12 year old female).

Clinical and genetic heterogeneity in autosomal dominant cataract

Br J Ophthalmol. 1999 Jul;83(7):802-808.
Figure 2

Boxplots showing variation in hair isotope (δ²H, δ¹³C, δ¹⁵N, δ¹⁸O) values of adult (>1 year old) and cub of year (cub; ≤1 year old) polar bears collected within polar bear subpopulation boundaries in the Canadian Arctic and sub-Arctic. See text or Fig. for subpopulation abbreviations. Midlines within boxes indicate the median isotope value, whiskers extend 1.5x beyond the interquartile range, and dots indicate outliers.

Geographical assignment of polar bears using multi-element isoscapes

Sci Rep. 2019;9:9390.
Figure 4

Mean proportion of time spent in water by month and reproductive status (with vs without cubs of the year (COYs)) for female polar bears in the Barents Sea subpopulation. Plotted values are monthly aggregates (N given by ‘n-months’) for individual polar bears (N given as ‘n-bears’), with polar bears tagged in multiple years contributing multiple monthly values.

Aquatic behaviour of polar bears (Ursus maritimus) in an increasingly ice-free Arctic

Sci Rep. 2018;8:9677.
Figure 1

Hair cortisol concentration (pg cortisol/mg hair) vs. year of kill for East Greenland polar bears (Ursus maritimus) collected 1994–2006. p = 0.11, r = −0.41 (excl. outlier; year of kill: 1995. 19.9 pg cortisol/mg hair, see text for further explanation). +: female, o: male.

Cortisol levels in hair of East Greenland polar bears

Sci Total Environ. ;409(4):831-834.