@article{Ryttman_1993, place={Lund, Sweden}, title={Survival and population development of the Goshawk Accipiter gentilis in Sweden}, volume={3}, url={https://journals.lub.lu.se/os/article/view/23050}, DOI={10.34080/os.v3.23050}, abstractNote={<p>In this study I have used recovery data from 691 Goshawks <em>Accipiter gentilis</em> that were ringed as nestlings between 1971 and 1990. The survival of the Goshawk was 34.4% in the first year, 61.6% in the second year, and 73.5% thereafter. Only 20% of the Goshawks reached an age of 2 years and 2 months, i.e. the age when they make their first breeding attempt. I used data on survival and reproductive success to estimate if the Swedish Goshawks had a stable population size. Provided that all breeding attempts are successful, the population is rather stable (x = +0.8%, 95% confidence limits: -7.6% +9.2%). With a more reasonable estimate of successful breeding attempts (30% of first time breeders, 60% of second time breeders and 100% of thereafter) the population is decreasing with on average 9%. A comparison of mark-recapture data from Swedish Pheasant farms suggests, however, that the Swedish Goshawk population has been rather stable during the 1980s.</p>}, number={1}, journal={Ornis Svecica}, author={Ryttman, Hans}, year={1993}, month={Jan.}, pages={33–42} }