New approach to analysis to tags reading data of northern fur seal females
https://doi.org/10.36038/2307-3497-2022-188-78-86
Abstract
Purpose: Development of methods for the analysis of materials on the return of tags from northern fur seals in order to study their life cycle and reproductive biology.
Method: Metal tagging of fur seal pups has been carried out on the Commander Islands since 1961. Reading marks on seals using optical devices was carried out in 1982–2014. during the harem period on the Central site of the Northern rookery (Bering Island).
Novelty: For the first time, the coefficients of tagging and loss of tags for female fur seals up to 14 years of age have been calculated. For the first time, the verification of tag return materials was carried out, the representativeness of the data and the possibility of their use for the analysis of the life cycle and breeding issues of seals were shown.
Results: The arrival of the female to the rookery during the harem period was considered as participation in reproduction. Based on the data of radio-tagging of female seals, the probability of meeting a tagged female on a rookery during the harem period was determined, which turned out to be almost equal to 1. The probability that during the harem period a tagged female will not be registered by an observer turned out to be negligibly small (0.23·10–3). The coefficients of fur seal tagging on the Commander Islands in 1980–2011 are presented. In accordance with the mathematical model, the annual loss of marks by fur seal females in the age range from 2 to 14 years was 4 % at a 95 % confidence level. According to the results of calculations, it was shown that the method of reading marks on live seals provides reliable representative material suitable for the analysis of the life cycle of females.
About the Authors
A. I. Boltnev
Russian Federal Research Institute of Fisheries and Oceanography («VNIRO»)
Russian Federation
Russian Federation
Alexander I. Boltnev
105187
19, Okruzhnoy proezd
Moscow
A. I. Mikhailov
Russian Federal Research Institute of Fisheries and Oceanography («VNIRO»)
Russian Federation
Russian Federation
Andrey I. Mikhailov
105187
19, Okruzhnoy proezd
Moscow
E. A. Boltnev
Russian Federal Research Institute of Fisheries and Oceanography («VNIRO»)
Russian Federation
Russian Federation
Evgenij A. Boltnev
105187
19, Okruzhnoy proezd
Moscow
S. I. Kornev
Kamchatka branch of «VNIRO» («KamchatNIRO»)
Russian Federation
Russian Federation
Sergej I. Kornev
683000
18, Naberezhnaya st.
Petropavlovsk-Kamchatsky
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Review
For citations:
Boltnev A.I., Mikhailov A.I., Boltnev E.A., Kornev S.I. New approach to analysis to tags reading data of northern fur seal females. Trudy VNIRO. 2022;188:78-86. (In Russ.) https://doi.org/10.36038/2307-3497-2022-188-78-86
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