Sperm Whales (Physeter catodon) in the Gulf of Mexico

1985 ◽  
Vol 30 (1) ◽  
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Laura A. Collum ◽  
Thomas H. Fritts
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Author(s):  
Miriam C Poirier ◽  
Letizia Marsili ◽  
Maria Cristina Fossi ◽  
Céline A J Godard-Codding ◽  
Elena E Hernandez-Ramon ◽  
...  

Abstract The northern Gulf of Mexico has a long history of polycyclic aromatic hydrocarbon (PAH) contamination from anthropogenic activities, natural oil seepages, and the 2010 Deepwater Horizon explosion and oil spill. The continental shelf of the same area is a known breeding ground for sperm whales (Physeter macrocephalus). To evaluate PAH-DNA damage, a biomarker for potential cancer risk, we compared skin biopsies collected from Gulf of Mexico sperm whales in 2012 with skin biopsies collected from sperm whales in areas of the Pacific Ocean in 1999-2001. All samples were obtained by cross-bow and comprised both epidermis and subcutaneous blubber. To evaluate exposure, 7 carcinogenic PAHs were analyzed in lipids extracted from Pacific Ocean sperm whale blubber, pooled by sex and location. To evaluate PAH-DNA damage, portions of all tissue samples were formalin fixed, paraffin embedded, sectioned, and examined for PAH-DNA adducts by immunohistochemistry (IHC) using an antiserum elicited against benzo[a]pyrene-modified DNA, which cross-reacts with several high molecular weight (HMW) carcinogenic PAHs bound to DNA. The IHC showed widespread epidermal nuclear localization of PAH-DNA adducts in the Gulf of Mexico whales (n = 15) but not in the Pacific Ocean whales (n = 4). A standard semi-quantitative scoring system revealed significantly higher PAH-DNA adducts in the Gulf of Mexico whales compared to the whales from the Pacific Ocean study (p=0.0002).


2008 ◽  
Vol 123 (5) ◽  
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Aaron Thode ◽  
Martha Winsor ◽  
Bruce Mate ◽  
Matt Howard ◽  
Katherine Kim ◽  
...  

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