Abstract
As a consequence of habitat loss, breeding in man-made habitats has become increasingly common for many coastal breeding bird species. While artificial sites provide valuable substitutes, they may also be more attractive, and importantly, differ in quality from natural sites. Therefore, information on habitat specific breeding success and their potential for supporting stable populations are needed. We compared little tern (Sternula albifrons) breeding success (nest and hatching success) between natural habitat (sandy beaches) and artificial port habitat at Bothnian Bay, Finland from 2006 to 2011. We further reviewed published estimates on pre-fledging and adult survival for little terns and least terns (Sternula antillarum), and used these ranges to estimate plausible parameter spaces for population growth rates given our estimates of breeding success. Nest success was among the highest reported for little terns in the artificial habitat (82 %) while being lower in the natural habitat (58 %). This difference may have resulted from differences in colony sizes and levels of disturbance. Hatching success did not differ significantly, but the percentage of successful nests containing unhatched eggs was twice as high in the natural habitat. The parameter spaces for population growth rates indicated that the artificial habitat has good potential to sustain stable populations (66 % positive growth rate) while for the natural habitat this potential was lower (37 % positive growth rate). While our results suggest that artificial habitats can be very productive breeding sites for habitat deprived tern populations, management should concentrate on improving both habitats with emphasis on natural sites.
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Acknowledgments
We thank Jorma Pessa from the regional Centre for Economic Development, Transport and the Environment (ELY-center) for co-operation with data collection. The data in Oulu was collected by VMP as part of the endangered species census organised and financed by the ELY-center. We thank also Matti Tynjälä from the environment office of Oulu and the Port of Oulu for cooperation in this study. We thank Robert L. Thomson and two anonymous referees for valuable comments on the manuscript. The study complies with national laws.
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Pakanen, VM., Hongell, H., Aikio, S. et al. Little tern breeding success in artificial and natural habitats: modelling population growth under uncertain vital rates. Popul Ecol 56, 581–591 (2014). https://doi.org/10.1007/s10144-014-0446-1
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DOI: https://doi.org/10.1007/s10144-014-0446-1