Journal
JOURNAL OF ORNITHOLOGY
Volume 162, Issue 1, Pages 119-124Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10336-020-01814-4
Keywords
Baltic dunlin; Capture-recapture; Juvenile survival; Precocial; Shorebird
Categories
Funding
- Formas [21.5/2002-1037, 217-2005-817, 215-2009-463]
- Oscar och Lili Lamms Minne [FO2009-0007, FO2012-0039]
- Carl Tryggers Stiftelse [CTS 09:294]
- Stiftelsen Lars Hiertas Minne
- Stiftelsen Olle Enqvist Byggmastare
- County Administration Board of Halland, Sweden
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Declines in wet-grassland breeding shorebird populations are mainly attributed to changes in reproduction. Research on an isolated population of Southern Dunlin in Sweden showed a strong correlation between brood survival and annual local recruitment, indicating that managing breeding sites can have significant impacts on local recruitment and population growth.
The declines in wet-grassland breeding shorebird populations are considered to mainly result from changes in reproduction. While there is plenty of information on nest survival, little reliable information exists on local recruitment due to confounding effects of permanent emigration. Furthermore, few studies have been able to study the roles of pre- and post-fledging survival on local recruitment. Therefore, it is unclear whether local recruitment of young reflects conditions at the breeding sites or at non-breeding sites. We studied an isolated population of the endangered Southern Dunlin (Calidris alpina schinzii) breeding on the west coast of Sweden to examine (1) brood survival (probability of at least one chick fledging) by following broods fates and (2) local recruitment (survival from hatching to 1 year old) using capture-recapture data. We then examined how much of the annual variation in juvenile survival was explained by variation in brood survival. Brood survival was on average 0.58 (annual range 0.08-1.00) and explained 64% of variation in annual local recruitment. Still local recruitment was rather high for a shorebird (0.17, SE = 0.023), which reflects the isolated nature of the study population. Our results suggest that local recruitment seems to be mainly constrained by chick survival during the pre-fledging period. Therefore, management of breeding sites leading to increased brood survival, e.g., reducing predation on chicks, should have strong impacts on local recruitment and local population growth.
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