100 Islands Research Program Terrestrial Vegetation Data - BC Central Coast - 2015, 2016, 2017

These data were collected as part of an observational, field-based study of the Hakai Institute 100 Islands Research Program. The purpose of 100 Islands was to study how marine subsidies, island-scale variables, and other drivers affect vegetation communities on islands of the Central Coast. Full methodology description detailed in linked documents section. The theory of island biogeography provides a basis for exploring patterns of diversity on islands. In the decades since the development of the theory, there has been a growing recognition that marine and terrestrial food webs are linked by the flow of subsidies, which may alter the productivity of recipient ecosystems. I tested whether marine subsidies alter the relationship between island area and plant species richness, and if the impact of those subsidies is mediated by landscape-scale habitat characteristics such as island area and shoreline slope. I established a large-scale observational study on 74 small islands (< 3 km 2 ) on the Central Coast of British Columbia. I measured inputs of marine subsidies through sea wrack accumulations on shorelines, and surveyed island plant communities. I found that 1) wrack biomass was positively associated with island-scale plant species richness, and 2) smaller islands had higher levels of marine- derived nitrogen (δ 15 N) in soils, and a less pronounced decline in marine-derived nitrogen in soils away from the marine-terrestrial edge. However, I found no evidence that subsidies alter the relationship between species richness and area. Further, I found little evidence that wrack biomass was associated with marine-derived nitrogen in soils, and little evidence for wrack subsidy effects on plot-scale plant species density or composition. The effects of wrack may be obscured by the long-term and consistent inputs of subsidies on islands on the Central Coast. More generally, I found that subsidies are associated with increased species richness independent of island area, and their effect on the relationship between island area and species richness may be context-dependent.

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Access and Use

Licence: Creative Commons Attribution 4.0
Limitations: Appropriate credit must be given to Hakai Institute and the authors of the dataset.

Data and Resources

Dates

Metadata Reference Date(s) September 23, 2021, 00:00 (UTC) (Publication)
September 23, 2021, 20:22 (UTC) (Revision)
Dataset Reference Date(s) February 09, 2020 (Publication)
Frequency of Update As Needed

Citation

Dataset extent

Map data © OpenStreetMap contributors

Additional Info

Field Value
Ocean Variables Other
Scope Dataset
Status On Going
Topic Category oceans
Maintenance Note Generated from https://cioos-siooc.github.io/metadata-entry-form
Point of Contact
  • Name: Hakai Geospatial Technology Team
    Affiliation: Hakai Institute
    Contact Info Email: data@hakai.org
    Role: Custodian
  • Name: Owen Fitzpatrick
    Affiliation: Hakai Institute
    Role: Point of Contact
  • Name: Owen Fitzpatrick
    Affiliation: Hakai Institute
    Role: Point of Contact
  • Affiliation: Hakai Institute
    Contact Info Email: data@hakai.org
    Role: Custodian
Responsible Party
  • Individual Name: Owen Fitzpatrick
    Organisation Name / Affiliation: Hakai Institute
    Role: Owner
  • Individual Name: Owen Fitzpatrick
    Organisation Name / Affiliation: Hakai Institute
    Role: Principal Investigator
  • Individual Name: Owen Fitzpatrick
    Organisation Name / Affiliation: Hakai Institute
    Role: Originator
  • Organisation Name / Affiliation: Hakai Institute
    Contact Info Email: data@hakai.org
    Role: Resource Provider
  • Organisation Name / Affiliation: Hakai Institute
    Contact Info Email: data@hakai.org
    Role: Owner
Spatial Extent {"type": "Polygon", "coordinates": [[[-128.68650306, 51.39874225], [-127.62082923, 51.39874225], [-127.62082923, 52.13303212], [-128.68650306, 52.13303212], [-128.68650306, 51.39874225]]]}
North Bounding Latitude 52.13303212
South Bounding Latitude 51.39874225
East Bounding Longitude -127.62082923
West Bounding Longitude -128.68650306
Temporal Extent
Vertical Extent Min: 0.0
Max: 1000.0
Default Locale English
Citation identifier
Version
Associated Datasets