When and where to count? Implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population

Piironen, Antti; Fox, Anthony D.; Kampe‐Persson, Hakon; Skyllberg, Ulf; Therkildsen, Ole; Laaksonen, Toni

doi:10.1002/1438-390x.12143

Cited by 5 publications

(2 citation statements)

References 32 publications

(48 reference statements)

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“…The birds using WF begin their autumn migration approximately one month earlier than those using CF. Although the majority of the WF birds breed north from those using CF, the fact that other goose species (particularly bean geese Anser fabalis , [47]) have a stopover at the Gulf of Bothnia in September–November indicates that environmental conditions in the area remain suitable for geese until late autumn. In addition, hunting mortality of satellite tracked greylag geese seems to be high among the birds breeding at the far end of the Gulf of Bothnia (A Piironen 2023, unpublished data).…”

Section: Discussionmentioning

confidence: 99%

A gradual migratory divide determines not only the direction of migration but also migration strategy of a social migrant bird

Piironen,

Laaksonen

2023

Proc. R. Soc. B.

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Migratory divides separate populations of migratory animals, facilitating the evolution of intraspecific differences in migration strategies. Migration strategies are expected to be different for birds using different flyways and environments, but the knowledge regarding the impact of the flyway on individual migration strategies is scarce. By using satellite tracking and neckband resightings, we reveal the existence and structure of a gradual migratory divide between two European flyway populations of greylag geese Anser anser . Birds breeding at the far end of the Gulf of Bothnia in the Baltic Sea coast use the Western Flyway, those breeding in the Gulf of Finland the Central Flyway and those breeding between these extremes scatter to the two flyways. By using Gaussian process modelling, we show that migration strategies differed between the flyways. The birds using the Western Flyway migrated earlier in autumn, performed longer annual migration and made a clear stopover during migration, whereas the birds using the Central Flyway flew directly to their wintering sites. The gradual migratory divide that also divides migration strategies provides insights into migratory divides on birds with learned migration. Distinct migration strategies in different flyways provide exciting possibilities to further study the factors driving migration strategies.

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Section: Discussionmentioning

confidence: 99%

A gradual migratory divide determines not only the direction of migration but also migration strategy of a social migrant bird

Piironen,

Laaksonen

2023

Proc. R. Soc. B.

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“…The Western Palearctic population of the species, consisting mainly of individuals belonging to the subspecies taiga bean goose (A. f. fabalis ), has declined in recent decades (Fox et al 2010, CAFF 2018, the conservation status of the subspecies being considered Vulnerable in Finland (Lehikoinen et al 2019). While efforts have been put into increasing the accuracy of methods used to estimate taiga been goose numbers in the nonbreeding season (Piironen et al, 2023), monitoring its numbers in the breeding season remains a challenging obstacle to efficient conservation of the subspecies. During the breeding season taiga bean goose is highly elusive, and any survey method involving disturbance caused by the presence of human observers will further reduce the detectability of the species (Pirkola and Kalinainen 1984).…”

Section: Introductionmentioning

confidence: 99%

Motion detection or time lapse? A comparison of camera trap triggers in the monitoring of elusive ground dwelling birds

Nykänen

Pöysä

Matala

et al. 2023

Preprint

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Wildlife cameras have emerged over the recent years as an effective research tool for collecting various types of data on wild animals, and they are used increasingly also in avian studies. However, choosing the best method to collect data depends on the aim of the research and the characteristics of the target species and its habitat. Here, we compared the performance of game cameras taking images by passive infrared motion sensitive (PIR) and time-lapse triggering in gathering occurrence and relative abundance data of the taiga bean goose (Anser fabalis fabalis) in peatlands across Finland in 2020-2021. We found the time lapse trigger mode to be more efficient in collecting data on goose presence than PIR triggering. However, there was no significant difference in the goose numbers between the two trigger modes. We also found the capture probability and relative abundance to vary between years, but this could be attributed to random inter-annual variation. In general, we find time lapse to be a more suitable method to study elusive ground dwelling birds like the taiga bean goose due to fewer required visits to camera sites compared to motion triggered cameras that may produce a lot of empty images due to false triggering. This reduces the disturbance to the geese and other wildlife during the sensitive breeding period.

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Rapid formation of new migration route and breeding area by Arctic geese

Madsen¹,

Schreven²,

Jensen³

et al. 2023

Current Biology

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When and where to count? Implications of migratory connectivity and nonbreeding distribution to population censuses in a migratory bird population

Cited by 5 publications

References 32 publications

A gradual migratory divide determines not only the direction of migration but also migration strategy of a social migrant bird

A gradual migratory divide determines not only the direction of migration but also migration strategy of a social migrant bird

Motion detection or time lapse? A comparison of camera trap triggers in the monitoring of elusive ground dwelling birds

Rapid formation of new migration route and breeding area by Arctic geese

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