Sea wrack wet to dry biomass calibrations for macroalgae of the Central Coast of British Columbia - 2018

This dataset contains species-specific standardized correction factors for wet-dry calibrations for several macroalgae species of the Central Coast of British Columbia.

Macroalgae and macrophytes form the base of productive ecosystems in the Northeastern Pacific Ocean. Often, ecological research on macrophytes, macroalgae, and sea wrack requires the conversion of biomass from wet to dry to create consistency across investigations. This process, however, can be impractical, time consuming, and labour intensive. Samples of 12 common Northeastern Pacific Ocean seaweed species (Alaria marginata, Codium fragile, Egregia menziesii, Fucus distichus, Macrocystis pyrifera, Mazzaella spp., Nereocystis luetkeana, Pterygophora californica, Pyropia spp., Ulva spp., and the seagrasses Zostera marina and Phyllospadix spp.) were collected randomly and opportunistically in two states: wet and fresh, or aged and partially desiccated. Samples were weighed, dried in an oven, and weighed again in a laboratory as quickly as possible after collection. Dried samples were disposed of after dry measurements were taken. Detailed methods are available in the in the linked folder.

We found that all species displayed a strong (R2 > 0.5) and predictable (p < 0.05) linear relationship between wet and dried conditions. Half of the aged samples did not have a significant relationship between partially desiccated and dried conditions. These results offer a reliable set of species-specific standardized correction factors for wet samples that can be used in future macrophyte, macroalgae, and sea wrack research, reducing the need to conduct extensive wet-dry calibrations in future studies.

Contributors: Sara Wickham – University of Victoria, Brian Starzomski – University of Victoria, John Reynolds – Simon Fraser University, Chris Darimont – University of Victoria

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



Dataset extent

Metadata Reference Date(s) March 02, 2022 (Publication)
March 02, 2022 (Revision)
Data Reference Date(s) May 20, 2016 (Creation)
Frequency of Update As Needed

Responsible Party 1
Hakai Geospatial Technology Team
Hakai Institute
  • Custodian
  • Distributor
  • Owner
  • Point of Contact
  • Publisher
  • Resource Provider
  • Contributor
Responsible Party 2
Sara Wickham
University of Victoria
  • Author
  • Custodian
  • Originator
  • Owner
  • Point of Contact

Field Value
Ocean Variables
  • Microbe biomass and diversity
  • Other
Scope Dataset
Status Completed
Topic Category oceans
Maintenance Note Generated from
Spatial Extent [[[-128.16116765, 51.64326925], [-128.11481908, 51.64326925], [-128.11481908, 51.66904109], [-128.16116765, 51.66904109], [-128.16116765, 51.64326925]]]
North Bounding Latitude 51.66904109
South Bounding Latitude 51.64326925
East Bounding Longitude -128.11481908
West Bounding Longitude -128.16116765
Temporal Extent
Vertical Extent
Default Locale English
Included in Data Catalogue
Included in Data Catalogue 1
Hakai Data Catalogue
Science on the Coastal Margin