Register for our FREE zoom presentation with Ari Friedlaender at acsorangecounty.org/events Hosted by the American Cetacean Society of Orange County When: 8/22 @7pm Topic: Antarctic minke whales are not necessarily rare, but they are rarely seen and remain poorly studied because of their cryptic nature and preferred habitat deep in the Antarctic sea ice. Recently, our research group completed a comprehensive study on the foraging behavior, habitat use, and social structure of these endemic Antarctic whales in an effort to better understand not just their habits but how they are likely to be affected by rapid climate-driven changes in sea ice cover around the Antarctic Peninsula. Sent from my iPhone
On Aug 14, 2024, at 9:08 AM, marmam-request@lists.uvic.ca wrote:
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Today's Topics:
1. New publication: Assessment of PFAS and physiological biomarkers in bottlenose dolphins and killer whales (Leila Soledade Lemos) 2. Clearwater Marine Aquarium Research Institute North Atlantic Right Whale Aerial Observer Job Announcement (Melanie White)
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Message: 1 Date: Tue, 13 Aug 2024 14:49:34 +0000 From: Leila Soledade Lemos <leslemos@hotmail.com> To: MARMAM grupo <marmam@lists.uvic.ca> Subject: [MARMAM] New publication: Assessment of PFAS and physiological biomarkers in bottlenose dolphins and killer whales Message-ID: <BN8PR02MB5764FB041CF0207EA800F10FCD862@BN8PR02MB5764.namprd02.prod.outlook.com>
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Hello MARMAMers,
My co-authors and I are excited to share our new publication at Chemosphere:
Lemos LS, Silva EM, Steinman KJ, Robeck TR, Quinete NS. 2024. Assessment of per- and poly-fluoroalkyl substances and physiological biomarkers in aquarium-based bottlenose dolphins and killer whales. Chemosphere 364: 143038. DOI: doi.org/10.1016/j.chemosphere.2024.143038. https://www.sciencedirect.com/science/article/pii/S0045653524019337
Abstract: Environmental concerns about per- and polyfluoroalkyl substances (PFAS) are considerably increasing due to their extensive use in commercial and consumer products. PFAS bioaccumulate and biomagnify throughout the food chain, and their toxicity and potential adverse health effects can potentially represent a threat to living organisms. In this study, we described PFAS profiles in the serum of two species of zoo-based bottlenose dolphins (Tursiops truncatus, n = 14 individuals) and killer whales (Orcinus orca, n = 14 individuals) from three locations (California, Florida, and Texas, USA), from 1994 to 2020. Potential physiological effects of PFAS were also explored by measuring different biomarkers (cortisol, corticosterone, aldosterone, TBARS, and hydrogen peroxide) while accounting for individual age, sex, and reproductive stage. All PFAS were detected in at least one of the individuals, considering both species. ?PFAS reached 496 ng mL?1 in bottlenose dolphins and! 230 ng mL?1 in killer whales. In both species, the PFAS with higher mean concentrations were PFOS (108.0?183.0 ng ml?1) and PFNA (14.40?85.50 ng ml?1), which are long-chain compounds. Newborn individuals of both species were also exposed to PFAS, indicating transference via placenta and lactation. Linear mixed model analyses indicated significant correlations between aldosterone, month, year, location, and status; and between hydrogen peroxide, month, year, age, status, ?PFAS, and ? short-chain PFAS in killer whales suggesting seasonal variations related to the animal's physiological state (e.g., reproductive cycles, stress responses, weaning events) and increased reactive oxygen species formation due to PFAS exposure. Given our results, other contaminant classes should be investigated in cetaceans as they might have additive and synergistic detrimental effects on these individuals. This study lays the foundation to guide future researchers and highlights the importance of! such assessments for animal welfare, and species conservation. Our results may inform management decisions regarding regulations of contaminant thresholds in delphinids.
Cheers,
[cid:03225ce8-3101-4ee5-8a7f-bc13c9d2310a] Leila S. Lemos, Ph.D. Institute of Environment Florida International University | MMC 11200 SW 8th St, VH 310 & 321 Miami, FL 33199 (971) 3409610?
https://www.researchgate.net/profile/Leila_Lemos https://www.linkedin.com/in/leila-soledade-lemos-94972415/