Abstract
Abundance and density distribution of four seal species (ringed, ribbon, spotted, and bearded) on spring ice was estimated based on the data from two instrumental aerial surveys in the western Bering Sea in April-May 2012 and April 2013 and compared with the previously published values. The number of ringed seals on ice was about 61,000, they were rather evenly distributed in the southern, middle and northern parts of the Russian EEZ in the Bering Sea. The estimated number of ribbon seals was about 62,000 in 2012, but only 15,000 in 2013. The number of bearded seals was estimated as 42,000 animals. The abundance and density distribution of spotted seals was shown to be a subject of significant interannual fluctuations with the maximum of about 97,000 individuals. The spotted or ribbon seals were not found in the Anadyr Bay, but importance of the Karaginsky Bay for reproduction of the phocid seals was confirmed. A large population of spotted seals was concentrated there and the ringed and bearded seals were presented there in the highest recorded density. Effectiveness of the instrumental aerial survey method application for assessing abundance and distribution of seals on sea ice was demonstrated. However, in order to estimate the real population abundance, it is essential to apply correction coefficients allowing to account for behavioural and migration processes predefining the proportion of seals available for detection.
Highlights
На основании материалов двух инструментальных авиасъемок, проведенных в западной части Берингова моря в апреле-мае 2012 и апреле 2013 гг., дана оценка численности четырех пагофильных видов тюленей — акибы, крылатки, лахтака и ларги — на весенних льдах, проанализировано их распределение и проведено сравнение этих показателей между учетами разных лет
Показана эффективность применения метода инструментальной авиасъемки для регистрации пагофильных тюленей и оценки их численности и распределения на весенних льдах
Abundance and density distribution of four seal species on spring ice was estimated based on the data from two instrumental aerial surveys in the western Bering Sea in April-May 2012 and April 2013 and compared with the previously published values
Summary
ЧИСЛЕННОСТЬ И РАСПРЕДЕЛЕНИЕ НАСТОЯЩИХ ТЮЛЕНЕЙ НА ЛЬДАХ В ЗАПАДНОЙ ЧАСТИ БЕРИНГОВА МОРЯ ВЕСНОЙ 2012–2013 ГГ. На основании материалов двух инструментальных авиасъемок, проведенных в западной части Берингова моря в апреле-мае 2012 и апреле 2013 гг., дана оценка численности четырех пагофильных видов тюленей — акибы, крылатки, лахтака и ларги — на весенних льдах, проанализировано их распределение и проведено сравнение этих показателей между учетами разных лет. Abundance and density distribution of four seal species (ringed, ribbon, spotted, and bearded) on spring ice was estimated based on the data from two instrumental aerial surveys in the western Bering Sea in April-May 2012 and April 2013 and compared with the previously published values. Основной целью настоящей работы стала оценка численности и распределения настоящих тюленей на льдах в российской части Берингова моря весной 2012–2013 гг. По мере обработки и опубликования результатов авиасъемок ученых двух стран будут получены сведения о численности популяций ледовых форм тюленей на всей акватории Берингова моря
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