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Supplemental Information

Plant species list of Mandarte Island recorded between 1896 - 2012

Includes a column for origin of species (native to coast British Columbia or exotic) and the current status on the island in comparison to 1896 (extinct, extant or introduced over the period between 1896 and 2012).

DOI: 10.7287/peerj.preprints.1787v1/supp-1

List of islands on which vegetation surveys used in this study have been conducted

Vegetation surveys have been conducted in 2007 and 2008 (Bennett et al. 2012) and 2012 (this study). Islands are classified as either supporting seabird colonies (‘gull islands’) or not (‘non-gull islands’).

DOI: 10.7287/peerj.preprints.1787v1/supp-2

Dataset of vegetation surveys on all islands (2007 - 2012) and on Mandarte Island (1986 & 2006)

In the first tab (vegetation surveys on all island 2007 - 2012) we included for every plot the data on number of species and cover of species, separated in exotic and native species groups. We give fraction of litter, rock, moss, lichens and bare ground cover. We give mean soil depth in the plot as well as % carbon and nitrogen in the soil sample of the plot. In the second and third tab (vegetation surveys Mandarte Island 1986 and 2006) we included for all plots on Mandarte Island the fraction of grass, rock and shrub cover, species cover specific (several species of plants) and soil depth.

DOI: 10.7287/peerj.preprints.1787v1/supp-3

Additional Information

Competing Interests

The authors declare that they have no conflict of interest.

Author Contributions

Thomas K Lameris conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Joseph R Bennett conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Louise K Blight reviewed drafts of the paper.

Marissa Giesen performed the experiments, analyzed the data.

Michael H Janssen performed the experiments.

Joop JHJ Schaminée conceived and designed the experiments.

Peter Arcese conceived and designed the experiments, performed the experiments, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Field Study Permissions

The following information was supplied relating to field study approvals (i.e., approving body and any reference numbers):

Tswaout and Tseycum bands permitted access to Mandarte,

Arbutus and unnamed Island, Parks Canada and the Gulf Islands National

Park Reserve permitted access to North and South Dock, Middle and

Little Channel, Rum, Reay the Isabella Islands, and BC Ministry of Forests,

Lands and Natural Resource Operations permitted access to Amelia, North

and South Ada, Wallace Point, Yeo and South Winchelsea Islands, US Fish and Wildlife Service permitted access to Alex Rocks, Boulder, Fortress and Sentinel islands and Long and Skull Islets, P Green permitted access to Coonand McConnell Island.

Data Deposition

The following information was supplied regarding data availability:

The raw data has been supplied as a Supplemental Dataset.

Funding

Field research was supported by the Natural Sciences and Engineering Research Council of Canada, University of British Columbia and H and W Hesse. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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