Assessment of clinical pathology and pathogen exposure in sea otters (Enhydra lutris) bordering the threatened population in Alaska

Tracey Goldstein, Verena A. Gill, Pam Tuomi, Daniel Monson, Alexander Burdin, Patricia A Conrad, J. Lawrence Dunn, Cara Field, Christine K Johnson, David A. Jessup, James Bodkin, Angela M. Doroff

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Northern sea otter (Enhydra lutris kenyoni) abundance has decreased dramatically over portions of southwest Alaska, USA, since the mid-1980s, and this stock is currently listed as threatened under the Endangered Species Act. In contrast, adjacent populations in south central Alaska, USA, and Russia have been stable to increasing during the same period. Sea otters bordering the area classified in the recent decline were live-captured during 2004-2006 at Bering Island, Russia, and the Kodiak Archipelago, Alaska, USA, to evaluate differences in general health and current exposure status to marine and terrestrial pathogens. Although body condition was lower in animals captured at Bering Island, Russia, than it was at Kodiak, USA, clinical pathology values did not reveal differences in general health between the two regions. Low prevalences of antibodies (,5%) were found in Kodiak, USA, and on Bering Island, Russia, to Toxoplasmagondii, Sarcocystis neurona, and Leptospira interrogans. Exposure to phocine herpesvirus-1 was found in both Kodiak, USA (15.2%), and Bering Island, Russia (2.3%). Antibodies to Brucella spp. were found in 28% of the otters tested on Bering Island, Russia, compared with only 2.7% of the samples from Kodiak, USA. Prevalence of exposure to Phocine distemper virus (PDV) was 41% in Kodiak, USA, but 0% on Bering Island, Russia. Archived sera from southwest and south-central Alaska dating back to 1989 were negative for PDV, indicating exposure occurred in sea otters in Kodiak, USA, in recent years. Because PDV can be highly pathogenic in nai{dotless}̈ve and susceptible marine mammal populations, tissues should be examined to explore the contribution of this virusto otter deaths. Our results reveal an increase in exposure to pathogens in sea otters in Kodiak,Alaska, USA, since the 1990s.

Original languageEnglish (US)
Pages (from-to)579-592
Number of pages14
JournalJournal of Wildlife Diseases
Volume47
Issue number3
StatePublished - Jul 2011

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Keywords

  • Alaska
  • Brucella
  • Enhydra lutris
  • Phocine distemper
  • Russia
  • Sea otter
  • Serosurvey

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Cite this

Goldstein, T., Gill, V. A., Tuomi, P., Monson, D., Burdin, A., Conrad, P. A., Dunn, J. L., Field, C., Johnson, C. K., Jessup, D. A., Bodkin, J., & Doroff, A. M. (2011). Assessment of clinical pathology and pathogen exposure in sea otters (Enhydra lutris) bordering the threatened population in Alaska. Journal of Wildlife Diseases, 47(3), 579-592.