Reproduction of Black-Throated Diver Gavia arctica in Relation to Fish Density in Oligotrophic Lakes in Southwestern Sweden
- 1 July 1986
- journal article
- research article
- Published by JSTOR in Ornis Scandinavica
- Vol. 17 (3), 245-248
- https://doi.org/10.2307/3676833
Abstract
A comparison of density of fish (< 20 cm) and production of "large" (halfgrown-fledged) Gavia arctica young in 24 oligotrophic lake in southwestern Sweden revealed a negative relationship between the two variables. High abundance of aquatic insects, suitable as an alternative food to fish for the young, and a low risk of predation by Esox lucius are suggested as two, not mutually exclusive explanations for the higher production of young in lakes with a low density of fish.This publication has 3 references indexed in Scilit:
- Relationships of Food to Spatial and Temporal Breeding Strategies of Mallards in SwedenThe Journal of Wildlife Management, 1984
- Do goldeneye and perch compete for food?Oecologia, 1982
- Competition between freshwater fish and goldeneyes Bucephala clangula (L.) for common preyOecologia, 1979