Data from: Predator-prey interactions in the Arctic: DNA-metabarcoding reveals that nestling diet of snow buntings reflects arthropod seasonality

• Main Authors: Stolz, Christian, Varpe, Øystein, Ims, Rolf A., Sandercock, Brett K., Stokke, Bård G., Fossøy, Frode
• Format: Dataset
• Language: unknown
• Published: 2023
• Subjects: arctic food web; Diet Analysis; Insectivore; Passeriformes; pitfall trap; scatology; Spitsbergen; tundra ecology; Invertebrates; Arctic; Svalbard; Plectrophenax nivalis; Snow Bunting; Tundra
• Online Access: https://zenodo.org/record/8012193; https://doi.org/10.5061/dryad.rfj6q57gg

Tundra arthropods are of considerable ecological importance as a seasonal food source for many arctic-breeding birds. Dietary composition and food preferences are rarely known, complicating assessments of ecological interactions in a changing environment. In our field study, we investigated nestling diet of snow buntings (Plectrophenax nivalis (L., 1758)) breeding in Svalbard. We collected faecal samples from 8-day-old nestlings and assessed dietary composition by DNA-metabarcoding. Simultaneously, the availability of potential prey arthropods was measured by pitfall-trapping. Molecular analyses of nestling faeces identified 31 arthropod taxa in the diet, whose proportions changed throughout the brood-rearing period. Changes in nestling diet matched varying abundances and emergence patterns of the tundra arthropod community. Snow buntings provisioned their offspring mainly with Diptera (true flies) based on both presence/absence and relative read abundance of diet items. At the beginning of the season in June, Chironomidae (non-biting midges) and the scathophagid fly Scathophaga furcata (Say, 1823) dominated the diet, whereas the muscid fly Spilogona dorsata (Zetterstedt, 1845) dominated the diet later in July. When accounted for availability, muscid flies were selected positively amongst the most often provisioned food taxa. Our study demonstrates the ecological role of the snow bunting as a generalist arthropod predator and highlights DNA-metabarcoding as a non-invasive technique for diet analyses with high taxonomical precision if sufficient DNA-sequence libraries are available. Funding provided by: Svalbard Science Forum*Crossref Funder Registry ID: Award Number: RiS ID 10909 Please refer to the published paper associated with this dataset, which provides a detailed description of the data collection methods.