Abundance and stock composition of narwhals (Monodon monoceros) in lnglefield Bredning (NW Greenland)

Abstract

The abundance of narwhals (Monodon monoceros) was estimated in Inglefield Bredning (NW Greenland) during the open-water season. Land-based observations were made in August 1985 and 1988 and aerial surveys using line-transect methodology were flown during late August 1985 and early August 1986. Group sizes based on both land-based and aerial surveys are given in relation to behavior and the age and sex composition of groups. The aerial surveys in 1986 indicated that adults comprised about 68%, non-adults (including neonates) 32%, and neonates about 15% of the population present in lnglefield Bredning. On 20 August 1985 a direct land-based count of 1548 whales was obtained in the eastern part of Inglefield Bredning. The aerial surveys in August 1985 resulted in estimates of between 847 (95% Cl 344-2085) and 1366 (95% Cl 854–2276), uncorrected to account for those out of sight underwater.

The aerial surveys in 1986 resulted in uncorrected estimates of between 2683 (95% CI 1029- 6998) and 4369 (95% CI 2037-9341). Between late July and mid-August 1988, remarkably fewer narwhals were observed from land in the eastern parts of Inglefield Bredning. The maximum number of narwhals that could be accounted for during this period was 473 narwhals.