Crab Team Reports


Technical Publication: Monitoring Site Selection

August 2022 – The Crab Team process for site selection has been key to the many early detection successes in the Salish Sea. This report was the result of a technical working process within Fisheries and Oceans Canada to compare several methods of site selection and how they would perform across inland waters of British Columbia.

Citation: Howard, BR, Gale, KSP, Davis, A, Lyons, DA, DiBacco, C, Grason, E, McDonald, PS, Green, SJ, Therriault, TW (2022) Evaluation of Methods for Identification of Early Detection Monitoring Sites Based on Habitat Suitability for Invasive European Green Crab in the Salish Sea, British Columbia. DFO Can. Sci. Advis. Sec. Res. Doc. 2022/057. vii + 54 p. (link)


Scientific Publication: Environmental DNA

February 2022 –  Abigail Keller, graduate student in the School of Marine and Environmental Affairs at UW validated an environmental DNA detection tool against traditional trapping-based efforts. How do traps compare? Read more in a series of blog posts

Citation: Keller, AG, Grason EW, McDonald PS, A Ramón-Laca, RP Kelly (2021) Tracking an invasion front with environmental DNA. Ecological Applications. Vol 32 (4):e2561. DOI: https://doi.org/10.1002/eap.2561


2021 Summary

December 2021 – A visual summary of monthly monitoring and assessment trapping efforts during the 2021 monitoring season.


2020 Summary

December 2020 – A visual summary of monthly monitoring and assessment trapping efforts during the 2020 monitoring season.


2019 Summary

December 2019 – A visual summary of monthly monitoring efforts and observations during the 2019 monitoring season.


Scientific Publication: Larval Dispersal

June 2019 –  Elizabeth Brasseale, graduate student at UW Oceanography, used computer models of the ocean to help learn how green crab larvae could be moving into and around the Salish Sea. Read more about this project in our newsletter.

Citation: Brasseale E, Grason EW, McDonald PS, Adams J, MacCready P (2019) Larval transport modeling support for identifying population sources of European green crab in the Salish Sea. Estuaries and Coasts. Vol 42:1586-1599. DOI: https://doi.org/10.1007/s12237-019-00586-2


EPA Project Report – Phase 2

December 2018 – The 2018 season of Crab Team was funded by the US Environmental Protection Agency under assistance agreement PC 00J90701 to Washington Department of Fish and Wildlife. This document provides the final report and deliverables of the project, including a summary of findings from 2018.


2018 Summary

December 2018 – A visual summary of monthly monitoring efforts and observations during the 2018 monitoring season.


Scientific Publication: Range Expansion

January 2018 – Crab Team’s first peer-reviewed publication, documenting the first European green crab confirmed on the Salish Sea shorelines of Washington State.

Citation: Grason EW, PS McDonald, J Adams, K Litle, JK Apple, A Pleus (2018) Citizen science program detects range expansion of the globally invasive European green crab in Washington State (USA)Management of Biological Invasions. Vol 9 (1): 39-47. DOI:https://doi.org/10.3391/mbi.2018.9.1.04


2017 Summary

January 2018 – A visual summary of volunteer efforts and observations during the 2017 monitoring season and showing program growth since the 2015 launch.


2016 Data Report

November 2017 – A closer look at Crab Team monitoring data from 2016. While Crab Team protocols search for evidence of European green crabs, the vast majority of data collected relate to native animals and habitats. In this report, we dive a little deeper into the seasonal and spatial patterns of abundance and diversity within the salt marsh and pocket estuary communities monitored across 26 sites along Washington’s inland shorelines. Available in high (5 MB) and low (1 MB) resolution


EPA Project Report – Phase 1

January 2017 – The first two years of Crab Team were funded by the US Environmental Protection Agency under assistance agreement PC 00J29801 to Washington Department of Fish and Wildlife. This document provides the final report and deliverables of the project, including a summary of findings from the first two years of the project, 2015 – 2016.


2016 Summary

A visual summary of volunteer efforts and data gathered during the 2016 monitoring season. This was Crab Team’s first full season of monitoring (April – September), and the first year European green crab was captured in Washington’s inland waters.


2015 Summary

2015 Crab Team Results Thumbnail A visual summary of volunteer efforts and data gathered during Crab Team’s pilot season of monitoring, from August to September 2015.