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Irina Trukhanova

Research Associate

Email

irinatr@apl.washington.edu

Phone

206-616-9171

Department Affiliation

Polar Science Center

Education

M.S. Ecology, Biodiversity, & Nature Conservation, St. Petersburg State University, 2009

Ph.D. Ecology, St. Petersburg State University, 2013

Publications

2000-present and while at APL-UW

Assessment of impacts and potential mitigation for icebreaking vessels transiting pupping areas of an ice-breeding seal

Wilson, S.C., I. Trukhanova, L. Dmitrieva, E. Dolgova, I. Crawford, M. Baimukanov, B. Ismagambetov, M. Pazylbekov, M. Jüssi, and S.J. Goodman, "Assessment of impacts and potential mitigation for icebreaking vessels transiting pupping areas of an ice-breeding seal," 214, 213-222, doi:10.1016/j.biocon.2017.05.028, 2017.

More Info

1 Oct 2017

Highlights
• Vessel passage impact through Caspian seal ice-breeding grounds was quantified.
• Measurable disturbance of mothers and pups occurred at distances exceeding 200 m.
• Collisions were more likely at night, when breaking new channels and at speeds ≥ 4 kn.
• Mother–pup separation distance when moving away was related to vessel proximity.
• Development of evidence-based mitigation has relevance to all polar seal species.

The commercial harvest of ice-associated seals in the Sea of Okhotsk, 1972-1994

Trukhanova, I.S., A.I. Grachev, A.G. Somov, V.N. Burkanod, K.L. Laidre, and P.L. Boveng, "The commercial harvest of ice-associated seals in the Sea of Okhotsk, 1972-1994," Plos One, 12, doi:10.1371/journal.pone.0182725, 2017.

More Info

10 Aug 2017

Sealing log books from 75 out of 79 commercial harvest cruises carried out between 1972 and 1994 in the Sea of Okhotsk, Russia, were analyzed to describe spatial and temporal allocation of ice-associated seal harvest effort, species composition of catches, total harvest rates, and related parameters for species including ringed (Pusa hispida), ribbon (Histriophoca fasciata), bearded (Erignathus barbatus) and spotted (Phoca largha) seal. Variations in catch per unit effort were explored in relation to year, sea ice conditions, day of the year, and geographic location. In most years, the harvest was predominantly represented by ringed seals (mean = 0.43, range 0.25–0.67), followed by ribbon (mean = 0.31, range 0.15–0.43), spotted (mean = 0.19, range 0.11–0.35) and bearded seals (mean = 0.07, range 0.03–0.14). The struck-and-lost percentages were as high as 30–35% for ringed, bearded and spotted seals and 15–20% for ribbon seals. Catch per unit effort (number of seals/skiff*day) for ringed, ribbon, and spotted seals had a similar seasonal pattern with a distinct spike in catches for spotted seals in the first week of May, for ribbon seals in the last week of May, and for ringed seals in the second week of June. Catches of bearded seals showed a less pronounced temporal structure with a gradual increase toward the end of the harvest season in the majority of years. Spatial distribution of harvest effort followed closely with seal distribution obtained from aerial surveys. These data could be used as a source of information on seal herd location throughout the breeding and molting seasons and for more complex demographic or life-table models. We did not find any evidence of the decline of catch per unit effort over the study period. Timely introduction of state regulations and efficient harvest management apparently prevented severe depletion of ice-associated seal populations in the Sea of Okhotsk during the periods of their intense exploitation.

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center
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