Selection against immigrants in wild seabird populations
International audience Immigration is a major demographic parameter shaping population dynamics and is an importantdriver of eco-evolutionary patterns, but the fitness consequences for individuals following theirsettlement to a new population (immigrants) remain poorly tested in wild animal populati...
| Published in: | Ecology Letters |
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| Main Authors: | , |
| Other Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
HAL CCSD
2021
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| Subjects: | |
| Online Access: | https://hal.science/hal-02971023 https://doi.org/10.1111/ele.13624 |
| Summary: | International audience Immigration is a major demographic parameter shaping population dynamics and is an importantdriver of eco-evolutionary patterns, but the fitness consequences for individuals following theirsettlement to a new population (immigrants) remain poorly tested in wild animal populations,particularly among long-lived species. Here we show that immigrants have a lower fitness thanresidents in three wild seabird populations (wandering albatross Diomedea exulans, southern fulmarFulmarus glacialoides, snow petrel Pagodroma nivea). Across all species and during a 32-yearperiod, immigrants made on average 9 to 29% fewer breeding attempts, had 5–31% fewer fledglings,had 2–16% lower breeding success and produced 6–46% fewer recruits. Female immigrationand male residency were also favored through differences in breeding performance. We provideevidence for selection against immigrants in wild populations of long-lived species and our resultsare consistent with female-biased dispersal in birds being driven by asymmetric limiting resourcesand the competitive ability of dispersers vs. non-dispersers. |
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