. Further by downloading this data the user acknowledges that they agree with the NERC data policy (), and the following conditions:

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:

Traits were collected as part of field expeditions to the Yukon to examine the effect of climate change on plant communities. Traits were gathered on individuals following standardised protocols set out in (Perez-Harguindeguy et al, 2013). Fresh traits were measured at field sites. Dried plant material (leaves and stems) were transported to the University of Edinburgh (UK) for processing.

Data collection:

Masses were measured using a digital mass balance (Ohaus Scout Pro). Area measurements were made using the software ImageJ.

Data quality:

All mass measured to nearest 0.01g. Field measured (fresh mass) data has greater uncertainty due to measurement in field environment. Dates are missing for some of the trait records and only the month and year are provided.