The Raccoon Dog – an important new nest predator of Black-tailed Godwit in northern Germany

Salewski, Volker; Schmidt, Luis

doi:10.18194/ws.00143

Cited by 5 publications

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“…Diurnal birds that rely exclusively on visual cues to find food (e.g. Engel et al 2020), accounted for only 5.1% (corvids 1.7%, raptors 3.4%) of attributable losses (Salewski et al 2019), although they were permanently present throughout the breeding season (unpubl. data).…”

Section: Discussionmentioning

confidence: 99%

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Nest cameras do not affect nest survival in a meadow-nesting shorebird

Salewski¹,

Schmidt²

2020

Bird Conservation International

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Summary Identifying the fate of birds’ nests and the causes of breeding failure is often crucial for the development of conservation strategies for threatened species. However, collecting these data by repeatedly visiting nests might itself contribute to nest failure or bias. To solve this dilemma, automatic cameras have increasingly been used as a time-efficient means for nest monitoring. Here, we consider whether the use of cameras itself may influence hatching success of nests of the Black-tailed Godwit Limosa limosa at two long-term study sites in northern Germany. Annually between 2013 and 2019, cameras were used to monitor godwit nests. In 2014 and 2019, nests were randomly equipped with cameras or not, and nest survival checked independently of the cameras. Nest-survival models indicated that survival probabilities varied between years, sites and with time of the season, but were unaffected by the presence of cameras. Even though predation is the main cause of hatching failure in our study system, we conclude that predators did not learn to associate cameras with food either when the cameras were initially installed or after they had been used for several years. Cameras were thus an effective and non-deleterious tool to collect data for conservation in this case. As other bird species may react differently to cameras at their nests, and as other sets of predators may differ in their ability to associate cameras with food, the effect of cameras on breeding success should be carefully monitored when they are used in a new study system.

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Section: Discussionmentioning

confidence: 99%

“…Cameras are an effective tool for monitoring the fate of Black-tailed Godwit clutches and identifying the cause of failure (Salewski and Schmidt 2019, Salewski et al 2019). In contrast, the information gathered by other methods is limited.…”

Section: Discussionmentioning

confidence: 99%

Nest cameras do not affect nest survival in a meadow-nesting shorebird

Salewski¹,

Schmidt²

2020

Bird Conservation International

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Invasive raccoon dog depredation on nests can have strong negative impact on the Dalmatian pelican’s breeding population in Bulgaria

et al. 2020

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Spatio-temporal movement patterns and habitat choice of red foxes (Vulpes vulpes) and racoon dogs (Nyctereutes procyonoides) along the Wadden Sea coast

Schwemmer¹,

Weiel²,

Garthe³

2021

Eur J Wildl Res

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Wetlands such as the World Heritage Site in the Wadden Sea include important habitats for breeding waterbirds. Its saltmarshes and adjacent conservation polders are used by thousands of breeding birds. However, some alarming population declines have been recorded during recent decades and previous studies found indications that predation pressure from red foxes (Vulpes vulpes) and more recently from invasive racoon dogs (Nyctereutes procyonoides) played an important role. The current study aimed to assess habitat utilisation by foxes and racoon dogs along the coast of the Wadden Sea. We equipped 21 foxes and seven racoon dogs with GPS collars and recorded a total of 37,586 (mean: 2,088) GPS fixes during a total of 2,617 (mean: 145) equipment days for red foxes and 3,440 (mean: 573) GPS fixes during a total of 272 (mean: 45) equipment days for racoon dogs. Foxes showed high individual variability in Kernel 95% home range sizes, with a mean of 172.2 ha (range: 3 to 824 ha) and little overlap among territories. Males had significantly larger home ranges than females, and there were no differences in home range sizes between adults (n = 14) and young (n = 4). Racoon dogs had smaller home ranges than foxes (mean: 52.8 ha). The preferred habitat type of both predators during daytime was the conservation polders along the Wadden Sea, while foxes also selected saltmarshes during the night. In contrast, both species avoided farmland areas. Foxes showed 20% of their activity during daylight hours and spent this time largely in areas with dense vegetation cover. None of the tagged individuals entered areas with particularly high bird densities (i.e. Wadden Sea islands or Halligen). However, our data suggest that foxes and racoon dogs frequently make use of linear structures such as dykes and dams and patrol along the tide line for carcasses. This suggests that at least single individuals of both species are prone to enter islands that are connected by dams to the mainland.

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The Raccoon Dog – an important new nest predator of Black-tailed Godwit in northern Germany

Cited by 5 publications

References 0 publications

Nest cameras do not affect nest survival in a meadow-nesting shorebird

Nest cameras do not affect nest survival in a meadow-nesting shorebird

Invasive raccoon dog depredation on nests can have strong negative impact on the Dalmatian pelican’s breeding population in Bulgaria

Spatio-temporal movement patterns and habitat choice of red foxes (Vulpes vulpes) and racoon dogs (Nyctereutes procyonoides) along the Wadden Sea coast

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