evemj

• Veys, Marie Laure; Jourdain, Eve Marie; O'Callaghan, Seán; Berthier, Juliette & Brandt, Carla Freitas (2026). Female-centred decision making and social interactions in killer whales revealed by drone-based observations. Animal Behaviour. ISSN 0003-3472. 241. doi: 10.1016/j.anbehav.2026.123732.
• Jourdain, Eve Marie; McKinney, Melissa A.; Remili, Anaïs; Andvik, Clare Margaret; Fagerlund, Carl Johan Ludwig & Karoliussen, Richard [Vis alle 8 forfattere av denne artikkelen] (2026). Advancing Amino Acid Isotope‐Inferred Trophic Ecology in an Apex Predator: Insights From a Data‐Rich Killer Whale Population. Ecology and Evolution. 16(8), s. 1–16. doi: 10.1002/ece3.74121. Fulltekst i vitenarkiv Vis sammendrag

  Amino acid‐specific nitrogen isotope analysis (δ 15 N‐AA) is increasingly used to infer trophic ecology, yet remains poorly validated in marine predators. We analyzed bulk tissue δ 15 N ( 15 N/ 14 N) and δ 13 C ( 13 C/ 12 C), and δ 15 N‐AA in 105 skin samples collected from individually identified Norwegian killer whales between 2017 and 2023. Forty‐two individuals with best documented diets in 2010–2023, based on field observations and corroborated by mercury concentrations and bulk tissue δ 15 N values in skin, provided reference diet groups against which δ 15 N‐AA‐derived hypotheses were tested: Fish‐only (100% fish prey; n  = 15), Intermediate mixed diet (~10% mammalian prey in addition to fish; n  = 14), and Top mixed diet (~50% mammals, 50% fish prey; n  = 13). Univariate and multivariate approaches identified diet as the primary driver of δ 15 N variation across individual amino acids and multivariate isotopic space, whereas sex and life stage had little effect. However, substantial inter‐individual variation remained unexplained and appeared to reflect metabolic processes. Metrics δ 15 N ΣTrophic—ΣSource (δ 15 N difference between the sum of trophic amino acids and the sum of source amino acids) and isotopic difference between glutamic acid/glutamine (Glu) and phenylalanine (Phe) (δ 15 N Glu–Phe ) successfully identified Top mixed diet whales but lacked the sensitivity to identify Intermediate mixed diet individuals, whilst δ 15 N values of Threonine showed no relationship with trophic position. Proline (Pro) and Phe used as trophic‐source pair provided the first plausible δ 15 N‐AA‐derived trophic position estimates for killer whales and performed better than bulk isotope‐derived trophic position when a priori knowledge was not available. Multivariate clustering of δ 15 N‐AA data complemented trophic position estimates by resolving finer‐scale dietary variation occurring within trophic levels.

• Andvik, Clare Margaret; Fagerlund, Carl Johan Ludwig; Jourdain, Eve Marie; Yuan, Bo; Haddad-Weiser, Gabrielle & Lyche, Jan Ludvig [Vis alle 9 forfattere av denne artikkelen] (2026). Comparing polychlorinated n-alkane occurrence and biomagnification with legacy contaminants in a killer whale food web. Environmental Research. ISSN 0013-9351. 306. doi: 10.1016/j.envres.2026.125367. Fulltekst i vitenarkiv Vis sammendrag

  Polychlorinated n-alkanes (PCAs), the largest component of the commercial product chlorinated paraffins, have been used globally in increasing amounts since the regulations of legacy contaminants, such as polychlorinated biphenyls (PCBs). The bioaccumulative potential of PCAs compared to legacy contaminants is inconclusive, with limited data available for PCAs with carbon chain length ≤9 and ≥18, particularly in food webs which include mammalian top predators. Here, we analysed and compared PCAs of different carbon chain length (very-short: PCAs-C6-9 [vSCCPs], short: PCAs-C10-13 [SCCPs], medium: PCAs-C14-17 [MCCPs], and long: PCAs-C18-24 [LCCPs]), 57 legacy contaminants, and total mercury (Hg) in killer whales (Orcinus orca) from northern Norway (n = 59) and a range of fish and marine mammals. We found that legacy organic contaminants dominated in concentration and pattern in marine mammals (54–87%), whereas PCAs and Hg dominated in fishes (58–98%). A species' physiology (poikilotherm or homeotherm) influenced the food web magnification of several contaminants, with estimated trophic magnification factors (TMFs) underestimated in PCAs, and overestimated in PCB-153, p.p’-DDE and Hg, if unaccounted for. PCAs-C6-9 and PCAs-C10-13 had similar and low TMFs for poikilotherms and homeotherms, and similar to PCB-28 (TMF range: 1.9–2.4 [95% confidence interval 0.9–5.7]). PCAs-C14-17 and PCAs-C18-24, had high TMFs in poikilotherms (4.8 [1.3–18] and 4.6 [1.2–18], respectively), and no significant trophic magnification in homeotherms (1.0 [0.5–2.3] and 1.0 [0.4–2.8], respectively), with the opposite pattern for PCB-153 and p.p’-DDE. Our results indicate higher PCA concentrations and biomagnification potential in poikilotherms than homeotherms, which is likely due to lower biotransformation and elimination ability.

• Costa, Helena; Rikardsen, Audun; Blanchet, Marie-Anne; Jourdain, Eve Marie; Waugh, Courtney Alice & Blévin, Pierre (2026). Disease Investigation in Norwegian Killer Whales (Orcinus orca): Challenges and Needs for Improving Free-Living Cetacean Health Assessments. Journal of Wildlife Diseases. ISSN 0090-3558. 62(2), s. 452–458. doi: 10.7589/JWD-D-25-00055. Fulltekst i vitenarkiv Vis sammendrag

  Knowledge of the occurrence and etiology of cetacean diseases remains limited in northern areas, including in the Arctic and sub-Arctic. In November 2023, three killer whales (Orcinus orca) were observed in northern Norway exhibiting abnormal behavior, including inability to swim upright, loss of directional control, short and shallow dives, and lethargy. These unusual cases occurred within a 2-wk period and in the same area, suggesting a common underlying condition. However, due to the lack of diagnostic biologic samples, the cause of disease remains speculative. Herein, we discuss possible differential diagnoses based on the available data, including infectious disease, exposure to biotoxins, and blast trauma. Disease in live free-swimming killer whales in Norway has not been documented previously. These cases illustrate the significant challenges of investigating disease in wild, live cetaceans and emphasize the urgent need for improved surveillance, field diagnostic tools, and response protocols. Suggested developments include the implementation of ready-to-use kits for blow, fecal, and environmental DNA sampling; drones equipped with sampling devices and thermal sensors; and mobile laboratories to support on-site diagnostics. Collectively, these tools could significantly improve early detection, investigation, and management of similar unusual events in wild cetacean populations.

• Dulgheriu, Daniela; Andvik, Clare Margaret; Jourdain, Eve Marie; Borgå, Katrine; Ruus, Anders & Haug, Tore [Vis alle 9 forfattere av denne artikkelen] (2026). A sensitive liquid chromatography–tandem mass spectrometry analytical method of steroid hormones in small blubber samples from four whale species. Conservation Physiology. 14(1). doi: 10.1093/conphys/coag023. Fulltekst i vitenarkiv Vis sammendrag

  Steroid hormones can give an indication of stress, physiological health and reproductive status in whales; however, analysis is often limited by sample mass. We developed a sensitive analytical method using solid phase extraction–liquid chromatography–electrospray ionization–tandem mass spectrometry (LC–ESI–MS/MS) for the identification and quantification of eight steroid hormones (cortisol, cortisone, testosterone, androstenedione, progesterone, 11-deoxycortisol, 11-deoxycorticosterone and 17-hydroxyprogesterone) in small amounts of whale blubber (≤50 mg). Blubber biopsies were collected from stranded killer whales (Orcinus orca; n = 7), harbour porpoises (Phocoena phocoena; n = 3) and sperm whales (Physeter macrocephalus; n = 4), harvested common minke whales (n = 10; Balaenoptera acutorostrata) and free-living killer whales (n = 2) in Norway and the Barents Sea. Steroid hormones were separated using pentafluorophenyl propyl stationary phase and an optimized gradient programme with a total 20-min run. All samples (n = 26) were analysed at 50-mg sample mass, and a subset (n = 11) at 25 mg or lower. Low limit of detection and limit of quantification values resulted in high detection rates of hormones, and we found similar hormone concentrations between parallel samples and at the lowest tested sample mass (14 mg). Cortisol concentrations in sperm whales (4.3 ± 1.6 ng/g) were four times higher than stranded killer whales (1.1 ± 0.96 ng/g), which in turn were up to four times higher than free-living killer whales (0.23 ± 0.12 ng/g), harbour porpoise (0.64 ± 0.38 ng/g) and harvested minke whales (0.22 ± 0.13), possibly due to fatality type and duration of stress prior to death. We provide the first quantification of blubber steroid hormones in killer whale, minke whale, sperm whale and harbour porpoise, and in less than 50-mg sample mass. By minimizing sample mass without compromising precision or sensitivity, our method allows for steroid hormone analysis even on samples with limited availability, strengthening our ability to monitor and conserve marine mammal populations.

• Costa, Helena; Ramstedt, Per; Bergsma, Myrthe; Jourdain, Eve Marie; Morange, Zoë Luccia Juliette & Blévin, Pierre [Vis alle 15 forfattere av denne artikkelen] (2025). Deep breath out: molecular survey of selected pathogens in blow and skin biopsies from North Atlantic cetaceans. BMC Veterinary Research. 21, s. 1–12. doi: 10.1186/s12917-025-05152-6. Fulltekst i vitenarkiv Vis sammendrag

  Background Cetacean morbillivirus, herpesvirus, avian influenza virus (AIV) and Brucella spp. have been linked to numerous cetacean strandings in the Northeast (NE) Atlantic. Yet, their prevalence in free-living cetaceans remains insufficiently investigated, particularly in northern regions. Methods Between 2016 and 2025, humpback whales (Megaptera novaeangliae), sperm whales (Physeter macrocephalus) and, opportunistically, fin whales (Balaenoptera physalus) and a long-finned pilot whale (Globicephala melas), were sampled in two foraging grounds in northern Norway (Skjervøy and Andenes), in Iceland and in Cape Verde. Blow samples (n = 76), skin biopsies (n = 45), and organ samples from one stranded pilot whale were collected and screened for cetacean morbillivirus, herpesvirus, AIV and Brucella spp, via polymerase chain reaction (PCR). Results In northern Norway, cetacean morbillivirus, identified as the dolphin morbillivirus (DMV) strain, was detected in the blows of two asymptomatic groups of humpback whales, in the blow of one sperm whale in poor health and in the kidney of a stranded pilot whale. An alphaherpesvirus was detected in the blows of five humpback whale groups sampled in Norway, Iceland, and Cape Verde, while a gammaherpesvirus was detected in one humpback whale skin biopsy, sampled in Norway. No other samples tested positive to any of the pathogens, including AIV or Brucella spp. Conclusion Our results demonstrate that minimally invasive sampling, particularly blow sampling, can be used for pathogen surveillance in free-ranging cetaceans. They also provide new insights into the circulation of cetacean morbillivirus and herpesviruses in cetaceans from the NE Atlantic. Continuous monitoring of pathogen exposure, alongside other stressors, will be crucial to assess the cumulative health implications for these cetaceans.

• Baumgartner, Chérine D.; Jourdain, Eve Marie; Bonhoeffer, Sebastian; Borgå, Katrine; Heide-Jørgensen, Mads P. & Karoliussen, Richard [Vis alle 13 forfattere av denne artikkelen] (2025). Kinship clustering within an ecologically diverse killer whale metapopulation. Heredity. ISSN 0018-067X. 134, s. 109–119. doi: 10.1038/s41437-024-00740-y. Fulltekst i vitenarkiv Vis sammendrag

  Metapopulation dynamics can be shaped by foraging ecology, and thus be sensitive to shifts in prey availability. Genotyping 204 North Atlantic killer whales at 1346 loci, we investigated whether spatio-temporal population structuring is linked to prey type and distribution. Using population-based methods (reflecting evolutionary means), we report a widespread metapopulation connected across ecological groups based upon nuclear genome SNPs, yet spatial structuring based upon mitogenome haplotypes. These contrasting patterns of markers with maternal and biparental inheritance are consistent with matrilineal site fidelity and philopatry, and male-mediated gene flow among demes. Connectivity between fish-eating and ‘mixed-diet’ (eating both fish and mammal prey) killer whales, marks a deviation within a species renowned for its marked structure associated with ecology. However, relatedness estimates suggest distinct spatial clusters, and heterogeneity in recent gene flow between them. The contrasting patterns between inference of structure and inference of relatedness suggest that gene flow has been partially restricted over the past two to three generations (50–70 years). This coincides with the collapse of North Atlantic herring stocks in the late 1960s and the subsequent cessation of their seasonal connectivity. Statistically significant association between diet types and assignment of Icelandic killer whales to relatedness-based clusters indicated limited gene flow was maintained through Icelandic ‘mixed-diet’ whales when herring-mediated connectivity was diminished. Thus, conservation of dietary variation within this metapopulation is critical to ensure genetic health. Our study highlights the role of resource dynamics and foraging ecology in shaping population structure and emphasises the need for transnational management of this widespread migratory species and its prey.

• Jourdain, Eve Marie; Karoliussen, Richard; Martin, Sarah Louise; Langangen, Øystein Ole Gahr; Robeck, Todd & Borgå, Katrine [Vis alle 8 forfattere av denne artikkelen] (2024). Social and genetic connectivity despite ecological variation in a killer whale network. Proceedings of the Royal Society of London. Biological Sciences. ISSN 0962-8452. 291(2021). doi: 10.1098/rspb.2024.0524. Fulltekst i vitenarkiv Vis sammendrag

  Philopatric kin-based societies encourage a narrow breadth of conservative behaviours owing to individuals primarily learning from close kin, promoting behavioural homogeneity. However, weaker social ties beyond kin, and across a behaviourally diverse social landscape, could be sufficient to induce variation and a greater ecological niche breadth. We investigated a network of 457 photo-identified killer whales from Norway (548 encounters in 2008–2021) with diet data available (46 mixed-diet individuals feeding on both fish and mammals, and 411 exclusive fish-eaters) to quantify patterns of association within and between diet groups, and to identify underlying correlates. We genotyped a subset of 106 whales to assess patterns of genetic differentiation. Our results suggested kinship as main driver of social bonds within and among cohesive social units, while diet was most likely a consequence reflective of cultural diffusion, rather than a driver. Flexible associations within and between ecologically diverse social units led to a highly connected network, reducing social and genetic differentiation between diet groups. Our study points to a role of social connectivity, in combination with individual behavioural variation, in influencing population ecology in killer whales.

• Andvik, Clare Margaret; Jourdain, Eve Marie; Borgen, Anders; Lyche, Jan Ludvig; Karoliussen, Richard & Haug, Tore [Vis alle 7 forfattere av denne artikkelen] (2024). Intercorrelations of Chlorinated Paraffins, Dechloranes, and Legacy Persistent Organic Pollutants in 10 Species of Marine Mammals from Norway, in Light of Dietary Niche. Environmental Science and Technology. ISSN 0013-936X. 58(33), s. 14797–14811. doi: 10.1021/acs.est.4c02625. Fulltekst i vitenarkiv Vis sammendrag

  Short-, medium-, and long-chain chlorinated paraffins (CPs) (SCCPs, MCCPs, and LCCPs) and dechloranes are chemicals of emerging concern; however, little is known of their bioaccumulative potential compared to legacy contaminants in marine mammals. Here, we analyzed SCCPs, MCCPs, LCCPs, 7 dechloranes, 4 emerging brominated flame retardants, and 64 legacy contaminants, including polychlorinated biphenyls (PCBs), in the blubber of 46 individual marine mammals, representing 10 species, from Norway. Dietary niche was modeled based on stable isotopes of nitrogen and carbon in the skin/muscle to assess the contaminant accumulation in relation to diet. SCCPs and dechlorane-602 were strongly positively correlated with legacy contaminants and highest in killer (Orcinus orca) and sperm (Physeter macrocephalus) whales (median SCCPs: 160 ng/g lw; 230 ng/g lw and median dechlorane-602: 3.8 ng/g lw; 2.0 ng/g lw, respectively). In contrast, MCCPs and LCCPs were only weakly correlated to recalcitrant legacy contaminants and were highest in common minke whales (Balaenoptera acutorostrata; median MCCPs: 480 ng/g lw and LCCPs: 240 ng/g lw). The total contaminant load in all species was dominated by PCBs and legacy chlorinated pesticides (63–98%), and MCCPs dominated the total CP load (42–68%, except 11% in the long-finned pilot whale Globicephala melas). Surprisingly, we found no relation between contaminant concentrations and dietary niche, suggesting that other large species differences may be masking effects of diet such as lifespan or biotransformation and elimination capacities. CP and dechlorane concentrations were higher than in other marine mammals from the (sub)Arctic, and they were present in a killer whale neonate, indicating bioaccumulative properties and a potential for maternal transfer in these predominantly unregulated chemicals.

• Remili, Anaïs; Dietz, Rune; Sonne, Christian; Samarra, Filipa I. P.; Rikardsen, Audun H. & Kettemer, Lisa Elena [Vis alle 16 forfattere av denne artikkelen] (2023). Quantitative fatty acid signature analysis reveals a high level of dietary specialization in killer whales across the North Atlantic. Journal of Animal Ecology. ISSN 0021-8790. 92(6), s. 1216–1229. doi: 10.1111/1365-2656.13920. Fulltekst i vitenarkiv Vis sammendrag

  Quantifying the diet composition of apex marine predators such as killer whales (Orcinus orca) is critical to assessing their food web impacts. Yet, with few exceptions, the feeding ecology of these apex predators remains poorly understood. Here, we use our newly validated quantitative fatty acid signature analysis (QFASA) approach on nearly 200 killer whales and over 900 potential prey to model their diets across the 5000 km span of the North Atlantic. Diet estimates show that killer whales mainly consume other whales in the western North Atlantic (Canadian Arctic, Eastern Canada), seals in the mid-North Atlantic (Greenland), and fish in the eastern North Atlantic (Iceland, Faroe Islands, Norway). Nonetheless, diet estimates also varied widely among individuals within most regions. This level of inter-individual feeding variation should be considered for future ecological studies focusing on killer whales in the North Atlantic and other oceans. These estimates reveal remarkable population- and individual-level variation in the trophic ecology of these killer whales, which can help to assess how their predation impacts community and ecosystem dynamics in changing North Atlantic marine ecosystems. This new approach provides researchers with an invaluable tool to study the feeding ecology of oceanic top predators.

• Andvik, Clare; Bories, Pierre; Harju, Mikael; Borgå, Katrine; Jourdain, Eve & Karoliussen, Richard [Vis alle 9 forfattere av denne artikkelen] (2023). Phthalate contamination in marine mammals off the Norwegian coast. Marine Pollution Bulletin. ISSN 0025-326X. 199. doi: 10.1016/j.marpolbul.2023.115936. Fulltekst i vitenarkiv Vis sammendrag

  Phthalates are used in plastics, found throughout the marine environment and have the potential to cause adverse health effects. In the present study, we quantified blubber concentrations of 11 phthalates in 16 samples from stranded and/or free-living marine mammals from the Norwegian coast: the killer whale (Orcinus orca), sperm whale (Physeter macrocephalus), long-finned pilot whale (Globicephala melas), white-beaked dolphin (Lagenorhynchus albirostris), harbour porpoise (Phocoena phocoena), and harbour seal (Phoca vitulina). Five compounds were detected across all samples: benzyl butyl phthalate (BBP; in 50 % of samples), bis(2-ethylhexyl) phthalate (DEHP; 33 %), diisononyl phthalate (DiNP; 33 %), diisobutyl phthalate (DiBP; 19 %), and dioctyl phthalate (DOP; 13 %). Overall, the most contaminated individual was the white-beaked dolphin, whilst the lowest concentrations were measured in the killer whale, sperm whale and long-finned pilot whale. We found no phthalates in the neonate killer whale. The present study is important for future monitoring and management of these toxic compounds.

• Jourdain, Eve Marie; Goh, Tiffany; Kuningas, Sanna; Similä, Tiu; Vongraven, Dag & Karoliussen, Richard [Vis alle 8 forfattere av denne artikkelen] (2021). Killer whale (Orcinus orca) population dynamics in response to a period of rapid ecosystem change in the eastern North Atlantic. Ecology and Evolution. 11, s. 17289–17306. doi: 10.1002/ece3.8364. Fulltekst i vitenarkiv Vis sammendrag

  This study investigates survival and abundance of killer whales (Orcinus orca) in Norway in 1988–2019 using capture–recapture models of photo-identification data. We merged two datasets collected in a restricted fjord system in 1988–2008 (Period 1) with a third, collected after their preferred herring prey shifted its wintering grounds to more exposed coastal waters in 2012–2019 (Period 2), and investigated any differences between these two periods. The resulting dataset, spanning 32 years, comprised 3284 captures of 1236 whales, including 148 individuals seen in both periods. The best-supported models of survival included the effects of sex and time period, and the presence of transients (whales seen only once). Period 2 had a much larger percentage of transients compared to Period 1 (mean = 30% vs. 5%) and the identification of two groups of whales with different residency patterns revealed heterogeneity in recapture probabilities. This caused estimates of survival rates to be biased downward (females: 0.955 ± 0.027 SE, males: 0.864 ± 0.038 SE) compared to Period 1 (females: 0.998 ± 0.002 SE, males: 0.985 ± 0.009 SE). Accounting for this heterogeneity resulted in estimates of apparent survival close to unity for regularly seen whales in Period 2. A robust design model for Period 2 further supported random temporary emigration at an estimated annual probability of 0.148 (± 0.095 SE). This same model estimated a peak in annual abundance in 2015 at 1061 individuals (95% CI 999–1127), compared to a maximum of 731 (95% CI 505–1059) previously estimated in Period 1, and dropped to 513 (95% CI 488–540) in 2018. Our results indicate variations in the proportion of killer whales present of an undefined population (or populations) in a larger geographical region. Killer whales have adjusted their distribution to shifts in key prey resources, indicating potential to adapt to rapidly changing marine ecosystems.

• Jourdain, Eve Marie; Barrett-Lennard, Lance G.; Ellis, Graeme M.; Ford, John K. B.; Karoliussen, Richard & Towers, Jared R. [Vis alle 7 forfattere av denne artikkelen] (2021). Natural Entrapments of Killer Whales (Orcinus orca): A Review of Cases and Assessment of Intervention Techniques. Frontiers in Conservation Science. 2. doi: 10.3389/fcosc.2021.707616. Fulltekst i vitenarkiv
• Jourdain, Eve Marie; Ugarte, Fernando; Víkingsson, Gísli A.; Samarra, Filipa; Ferguson, Steven H. & Lawson, Jack [Vis alle 8 forfattere av denne artikkelen] (2019). North Atlantic killer whale Orcinus orca populations: a review of current knowledge and threats to conservation. Mammal Review. ISSN 0305-1838. 49(4), s. 384–400. doi: 10.1111/mam.12168. Fulltekst i vitenarkiv
• Jourdain, Eve Marie & Vongraven, Dag (2017). Humpback whale (Megaptera novaeangliae) and killer whale (Orcinus orca) feeding aggregations for foraging on herring (Clupea harengus) in Northern Norway. Mammalian Biology. ISSN 1616-5047. 86, s. 27–32. doi: 10.1016/j.mambio.2017.03.006. Fulltekst i vitenarkiv
• Jourdain, Eve Marie; Vongraven, Dag; Bisther, Anna & Karoliussen, Richard (2017). First longitudinal study of seal-feeding killer whales (Orcinus orca) in Norwegian coastal waters. PLOS ONE. 12(6). doi: 10.1371/journal.pone.0180099. Fulltekst i vitenarkiv

Se alle arbeider i NVA

• su, Audrey; Jourdain, Eve Marie; Andvik, Clare Margaret; Rikardsen, Audun H.; Søderstrøm, Sofie & Blévin, Pierre [Vis alle 7 forfattere av denne artikkelen] (2025). Den forgiftede hvalen Elida. [Internet]. web, social media. doi: https:/akvaplan.no/no/video/2025-09-29/den-forgiftede-hvalen-elida-121104. Fulltekst i vitenarkiv
• Andvik, Clare Margaret; Jourdain, Eve Marie; Borgen, Anders; Lyche, Jan Ludvig; Karoliussen, Richard & Haug, Tore [Vis alle 7 forfattere av denne artikkelen] (2025). Intercorrelations of short-, medium- and long-chain chlorinated paraffins, dechloranes and legacy POPs in 10 species of marine mammals from Norway, in light of dietary niche. Fulltekst i vitenarkiv
• Jourdain, Eve Marie (2024). Alle henger med alle, men familie er viktigst for norske spekkhoggere. [Journal]. Forskning.no. Fulltekst i vitenarkiv
• Milne, Stephanie; Andvik, Clare Margaret; Jourdain, Eve Marie; Karoliussen, Richard; Vongraven, Dag & Øien, Nils Inge [Vis alle 8 forfattere av denne artikkelen] (2024). Temporal trends of dietary patterns and mercury in Norwegian killer whales from contrasting ecosystem states. Fulltekst i vitenarkiv
• Lee, Kiah Jane Oland; Jourdain, Eve Marie; Remili, Anaïs; Andvik, Clare Margaret; Fagerlund, Carl Johan Ludwig & McKinney, Melissa [Vis alle 8 forfattere av denne artikkelen] (2024). Profiling the diet of Norwegian killer whales through quantitative fatty acid signature analysis (QFASA) and mercury accumulation. Fulltekst i vitenarkiv
• Andvik, Clare Margaret; Jourdain, Eve Marie; Dulgheriu, Daniela; Lyche, Jan Ludvig; Karoliussen, Richard & Ruus, Anders [Vis alle 7 forfattere av denne artikkelen] (2024). Blubber Cortisol Levels in Norwegian Killer Whales: Accounting for Individual Variation is Vital in Assessing Stress Responses to Whale Watching. Fulltekst i vitenarkiv
• Jourdain, Eve Marie; Borgå, Katrine; Ruus, Anders & Andvik, Clare Margaret (2023). Spekkhoggerflokken trues av gammel gift. Forskerne følger dem tett. [Journal]. Titan.uio.no. Fulltekst i vitenarkiv
• Fagerlund, Carl Johan Ludwig; Jourdain, Eve Marie; Andvik, Clare Margaret; Yuan, Bo; Ruus, Anders & Borgå, Katrine (2023). Understanding mercury and chlorinated paraffins biomagnification by identifying dietary patterns in killer whales in Norway. Fulltekst i vitenarkiv
• Andvik, Clare Margaret; Jourdain, Eve Marie; Ruus, Anders & Borgå, Katrine (2023). Effect of multiple stressors on Norwegian killer whales (MULTIWHALE). Fulltekst i vitenarkiv
• Andvik, Clare Margaret; Jourdain, Eve Marie; Borgen, Anders; Haug, Tore; Karoliussen, Richard & Borgå, Katrine (2023). Short, Medium and Long-chain Chlorinated Paraffins and Dechloranes in Marine Mammals from Norway. Fulltekst i vitenarkiv
• Andvik, Clare Margaret; Jourdain, Eve Marie; Ruus, Anders & Borgå, Katrine (2023). Effect of multiple stressors on Norwegian killer whales (MULTIWHALE). Fulltekst i vitenarkiv
• Andvik, Clare Margaret; Jourdain, Eve Marie; Lyche, Jan Ludvig; Enge, Ellen Katrin; Harju, Mikael & Haug, Tore [Vis alle 8 forfattere av denne artikkelen] (2022). High levels of emerging and legacy contaminants in whales from Norway. Fulltekst i vitenarkiv
• Andvik, Clare Margaret; Jourdain, Eve Marie; Lyche, Jan Ludvig; Harju, Mikael; Haug, Tore & Enge, Ellen Katrin [Vis alle 8 forfattere av denne artikkelen] (2021). High levels of emerging and legacy contaminants in stranded marine mammals from Norway. Fulltekst i vitenarkiv
• Andvik, Clare Margaret; Jourdain, Eve Marie; Ruus, Anders; Lyche, Jan Ludvig; Karoliussen, Richard & Borgå, Katrine (2020). At risk: Preying on seals pushes killer whales from Norway above pollution effects thresholds. Fulltekst i vitenarkiv
• Jourdain, Eve Marie; Andvik, Clare Margaret; Karoliussen, Richard; Vongraven, Dag; Ruus, Anders & Borgå, Katrine (2019). Variations in ecological niche in Norwegian killer whales (Orcinus orca) inferred from dietary descriptors and observational evidence. Fulltekst i vitenarkiv
• Andvik, Clare Margaret; Jourdain, Eve Marie; Ruus, Anders; Lyche, Jan Ludvig; Karoliussen, Richard & Borgå, Katrine (2019). Higher levels of organohalogen contaminant and mercury in seal-eating killer whales than fish-eating killer whales in northern Norway. Fulltekst i vitenarkiv
• Gundersen, Cathrine Brecke; Nipen, Maja; Reid, Malcolm James; Ruus, Anders; Rostkowski, Pawel & Blévin, Pierre [Vis alle 17 forfattere av denne artikkelen] (2024). Screening Programme 2023. Norsk institutt for vannforskning (NIVA). ISSN 9788257777463. Fulltekst i vitenarkiv Vis sammendrag

  The 2023 Screening Programme aimed to investigate the presence of emerging environmental concerning substances 1) at so-called “hot spot” locations, and 2) in marine top predators. Part 1 covered emerging substances that were considered for EU regulation; persistent, mobile and toxic; identified as problematic (Sweden); and UV-stabilizers. Sampling sites were a wastewater treatment plant, indoor dust, agricultural soils, and consumer products. Part 2 covered substances found in the 2021 Screening Programme as well as selected through the LIfeAPEX project. Additionally, in part 2, several classical legacy contaminants were included. A unique sample set was assembled with different types of tissue from whales (killer whale, sperm whale, fin whale, humpback whale, white beaked dolphin, and harbor porpoise) and sharks (greenland shark, porbeagle shark, and spiny dogfish). Highlights from the results in part 1 covered a high detection frequency and concentrations of one phthalate (CAS 6422-86-2) and two UV-stabilizers (CAS 154702-15-5 and 103597-45-1). In part 2, only a small number of the emerging substances were identified, while many of the legacy substances were found at high levels.

Se alle arbeider i NVA