Open AccessDensity and distribution of the ringed seal in the Bothnian Bay
Author(s) -
Härkönen Tero,
HeideJørgensen MadsPeter
Publication year - 1990
Publication title -
ecography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.973
H-Index - 128
eISSN - 1600-0587
pISSN - 0906-7590
DOI - 10.1111/j.1600-0587.1990.tb00597.x
Subject(s) - bay , transect , environmental science , population density , population , oceanography , geography , physical geography , fishery , ecology , biology , geology , demography , sociology
A modified strip census of basking ringed seals in the Bothnian Bay was carried out during the last week of April and the first week of May 1988. Of the total ice covered area, 23174 km 2 , 3236 km 2 (14%) was covered by the transects. The mean density in the area was 0.101 ringed seals km ‐2 , with substantial regional and local variation. Highest densities were found in the compact drift ice area. The estimated total population of ringed seals on the ice was 2093 in the Bothnian Bay proper and 248 in the North Quark. The 95% confidence limits of the estimates are ±24%.