Dataset for: Native versus invasive nest predators in Iceland

Common eider (Somateria mollissima) nest counts in Breiðafjörður Bay in West Iceland in the two archipelagos Brokey (95 islands over 123 years) and Purkey (39 islands over 27 years) along with size information on islands and their distance from mainland. Information on presence/absence of invasive American mink (Neogale vison) and native arctic fox (Vulpes lagopus) as well as the Atlantic Multidecadal Oscillation index (AMO) is provided, too., All islands were visited over the span of 1–2 weeks every breeding season each year, depending on weather and the number of people available. For Brokey and Purkey, nests were counted and located by 6–12 and 2–5 people per year, respectively. The only years missing are the years 1946–1950 in the Brokey archipelago., Icelandic character set
All files called strandlina_flakar.xyz have to be put in one folder with the name strandlina_flakar together with wfsrequest.txt
The file S2_jonsson_rickowski_ruland_asgeirsson_jeschke.csv includes all data on island sizes, distance to mainland, nest counts and mink and fox presence/absence.
The file islandNameTable.csv contains the same geographic information on islands and additionally its coordinates for map creation., # Data for: Native versus invasive nest predators in Iceland

***

Common eider *(Somateria mollissima)* nest counts in Breiðafjörður Bay in West Iceland in the two archipelagos Brokey (95 islands over 123 years) and Purkey (39 islands over 27 years) along with size information on islands and several measures of their distance from mainland. Information on presence/absence of invasive American mink *(Neogale vison)* and native arctic fox *(Vulpes lagopus)* as well as the Atlantic Multidecadal Oscillation index (AMO) are provided, too.
All islands were visited over the span of 1–2 weeks every breeding season each year, depending on weather and the number of people available. For Brokey and Purkey, nests were counted and located by 6–12 and 2–5 people per year, respectively. The only years missing are the years 1946–1950 in the Brokey archipelago.

## Description of the Data and file structure

In addition to nest counts, the following information is provided for each island in separate c...