Surfgrass Community Structure - Length & Density - BC Central Coast - 2017-2019


The surfgrass length & density dataset is a component of the Hakai Institute’s Nearshore research and monitoring program, designed to capture change in rocky intertidal habitats. ​The overarching objective of Hakai Nearshore research is to investigate the role of habitats and their associated communities, in the face of stress and disturbances from global climate change and local coastal perturbations.​ The structure, health, and coverage of surfgrass beds (Phyllospadix spp.) was surveyed at three sites along the northwestern coast of Calvert Island on the central coast of BC. All three sites were exposed rocky shores with large beds of surfgrass growing in the low intertidal. The beds were surveyed using a point-intercept method with quadrats placed along a single transect. The placement and length of the transect was replicated through time, quadrat placement was not. Various parameters (e.g., average length, shoot density, epiphyte cover) of the surfgrass were assessed at the transect and/or quadrat level. The sites were generally surveyed on a monthly basis from April to September, with winter surveys in November and February. One survey was conducted in 2017, 4 in 2018, and 5 in 2019. This data package is freely available to everyone, following the principles of equitable access and benefit sharing. However, we expect all data users to give attribution to the data providers (read our data license) and the use of these data should happen in the light of fair use, i.e.: 1) respect the data providers, and provide helpful feedback on data quality, and 2) communicate and/or collaborate with the providers if you are considering using this dataset for manuscripts or other forms of reporting.

Access and Use

Licence: Creative Commons Attribution 4.0
Limitations: Creative Commons Attribution 4.0 International (CC BY 4.0)

Data and Resources



Dataset extent

Metadata Reference Date(s) October 20, 2021 (Publication)
March 14, 2024 (Revision)
Data Reference Date(s) October 15, 2020 (Publication)
Frequency of Update As Needed

Responsible Party 1
Froese, Tyrel ORCID logo
Hakai Institute ROR logo
  • Author
  • Custodian
  • Point of Contact
Responsible Party 2
Gehman, Alyssa-Lois ORCID logo
Hakai Institute ROR logo
  • Custodian
  • Point of Contact
  • Principal Investigator
Responsible Party 3
Hakai Institute
  • Distributor
  • Owner
  • Publisher
  • Funder

Field Value
Ocean Variables Other
Scope Dataset
Status Completed
Topic Category oceans
Maintenance Note Generated from
Spatial Extent { "coordinates": [ [ [ -128.16164885, 51.64376791 ], [ -128.12937651, 51.64376791 ], [ -128.12937651, 51.66996532 ], [ -128.16164885, 51.66996532 ], [ -128.16164885, 51.64376791 ] ] ], "type": "Polygon" }
North Bounding Latitude 51.66996532
South Bounding Latitude 51.64376791
East Bounding Longitude -128.12937651
West Bounding Longitude -128.16164885
Vertical Extent
Default Locale English
Citation identifier
Included in Data Catalogue
Included in Data Catalogue 1
Hakai Data Catalogue
Science on the Coastal Margin