Grazed wet meadows are sink habitats for the southern dunlin (Calidris alpina schinzii) due to nest trampling by cattle

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Pysyväisosoite

http://hdl.handle.net/10138/169369

Lähdeviite

Pakanen , V-M , Aikio , S , Luukkonen , A & Koivula , K 2016 , ' Grazed wet meadows are sink habitats for the southern dunlin (Calidris alpina schinzii) due to nest trampling by cattle ' , Ecology and Evolution , vol. 6 , no. 20 , pp. 7176-7187 . https://doi.org/10.1002/ece3.2369

Julkaisun nimi: Grazed wet meadows are sink habitats for the southern dunlin (Calidris alpina schinzii) due to nest trampling by cattle
Tekijä: Pakanen, Veli-Matti; Aikio, Sami; Luukkonen, Aappo; Koivula, Kari
Tekijän organisaatio: Finnish Museum of Natural History
Päiväys: 2016-10
Kieli: eng
Sivumäärä: 12
Kuuluu julkaisusarjaan: Ecology and Evolution
ISSN: 2045-7758
DOI-tunniste: https://doi.org/10.1002/ece3.2369
URI: http://hdl.handle.net/10138/169369
Tiivistelmä: The effect of habitat management is commonly evaluated by measuring population growth, which does not distinguish changes in reproductive success from changes in survival or the effects of immigration or emigration. Management has rarely been evaluated considering complete life cycle of the target organisms, including also possible negative impacts from management. We evaluated the effectiveness of cattle grazing in the restoration of coastal meadows as a breeding habitat for small and medium-sized ground-nesting birds by examining the size and demography of a southern dunlin (Calidris alpina schinzii) breeding population. Using a stochastic renesting model that includes within-season variation in breeding parameters, we evaluated the effect of grazing time and stocking rates on reproduction. The census data indicated that the population was stable when nest trampling was prevented, but detailed demographic models showed that the population on managed meadows was a sink that persisted by attracting immigrants. Even small reductions in reproductive success caused by trampling were detrimental to long-term viability. We suggest that the best management strategy is to postpone grazing to after the 19th of June, which is about three weeks later than what is optimal from the farmer's point of view. The differing results from the two evaluation approaches warn against planning and evaluating management only based on census population size and highlight the need to consider target-specific life history characteristics and demography. Even though grazing management is crucial for creating and maintaining suitable habitats, we found that it was insufficient in maintaining a viable population without additional measures that increase nest success. In the presently studied case and in populations with similar breeding cycles, impacts from nest trampling can be avoided by starting grazing when about 70% of the breeding season has past.
Avainsanat: conservation
dispersal
management
nest trampling
recruitment
restoration
shorebird
AGRI-ENVIRONMENT SCHEMES
COASTAL MEADOWS
AGRICULTURAL LANDSCAPES
POPULATION-DYNAMICS
BREEDING DISPERSAL
APPARENT SURVIVAL
ECOLOGICAL TRAPS
MARKED ANIMALS
MANAGEMENT
WADER
1181 Ecology, evolutionary biology
Vertaisarvioitu: Kyllä
Tekijänoikeustiedot: cc_by
Pääsyrajoitteet: openAccess
Rinnakkaistallennettu versio: publishedVersion


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