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Please contact authors before publishing the data. Please use the following acknowledgements when using/publishing the data: "We thank the Herschel Island-Qikiqtaruk Territorial Park, Isla Myers-Smith, Cameron Eckert, Richard Gordon, Catherine Kennedy, Dorothy Cooley, and Dr. Jill F. Johnstone for establishing and maintaining the phenology and composition data from Qikiqtaruk. We thank Haydn J.D. Thomas, Meagan M. Grabowski, Sandra Angers-Blondin, Gergana N. Daskalova, Jakob J. Assmann for assisting with the collection and compilation of the data. We thank rangers including Edward McLeod, Samuel McLeod, Ricky Joe, Paden Lennie, Deon Arey, LeeJohn Meyook, Jordan McLeod, Pierre Foisy, Colin Gordon, Jeremy Hansen, Albert Rufus and field assistants including Santeri Lehtonen, William Palmer, Louise Beveridge, Clara Flintrop, John Godlee, Eleanor Walker, Joseph Boyle, Catherine Henry and Anika Trimble. Funding for data collection was provided by Herschel Island-Qikiqtaruk Territorial Park and the UK Natural Environment Research Council ShrubTundra Grant (NE/M016323/1). We thank the Inuvialuit People for the opportunity to collect these data on their traditional lands."

Methodology:

Plots were visited on different dates across the 2016 and 2017 growing seasons. During each visit, the phenological stage of marked plant individuals was recorded. The lengths of the longest flower stalks and the longest leaves were measured during each visit.

There were five monitored species -

Salix arctica - SALARC

Salix pulchra - SALPUL

Eriophorum vaginatum - ERIVAG

Dryas integrifolia - DRYINT

Arctagrostis latifolia - ARCLAT

There were two distinct vegetation communities -

Herschel - HER

Komakuk - KOM

Data collection:

Flower stalk length, leaf length and new growth length were measured using digital callipers. A metal probe was used to measure active layer depth. Soil moisture was measured using an electronic soil moisture meter.

Resolution: 2x2 meter plots

Data quality:

Data collection methods were consistent across 2016 and 2017.