Current status of the Ladoga ringed seal Pusa hispida ladogensis (Nordquist, 1899)

Authors

  • Mikhail Verevkin Saint Petersburg State University, 7–9, Universitetskaya nab., Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0003-3489-1238
  • Vadim Vysotsky Zoological Institute, Russian Academy of Sciences, 1, Universitetskaya nab., Saint Petersburg, 199164, Russian Federation

Abstract

Aerial survey using strip transects method was performed in April 2012, when majority of ringed seals were hauled out on ice during the moulting period. Adaptive distance sampling and stratification were used. The observed number of ringed seals in 25 transects (in total 2368 km) was 807. Calculations were performed using program DISTANCE. Basking population was estimated at 5211 (CV = 15.4 %) with 95 % confidence limits from 3769 to 7204. The mean density was estimated to be 0.38 seals/km2. There is indication that ringed seal numbers have increased approximately 2.6 times in the last 10 years. Refs 41. Figs 2. Tables 1.

Keywords:

Ladoga ringed seal, Ladoga lake, aerial survey, abundance estimation, population increase

Downloads

Download data is not yet available.
Vestnik of Saint Petersburg University. Series 3. Biology

Downloads

Published

2013-12-30

How to Cite

Verevkin, M., & Vysotsky, V. (2013). Current status of the Ladoga ringed seal <em>Pusa hispida ladogensis</em> (Nordquist, 1899). Biological Communications, (4), 14–25. Retrieved from https://biocomm.spbu.ru/article/view/1321

Issue

No. 4 (2013)

Section

Full communications

License

Articles of Biological Communications are open access distributed under the terms of the License Agreement with Saint Petersburg State University, which permits to the authors unrestricted distribution and self-archiving free of charge.