DOI: 10.5061/dryad.sqv9s4ndp
title: Data from: Tracking two invasions for the cost of one: Opportunistically tracking the range expansion of non-native Palaemon macrodactylus in the Salish Sea through participatory science

description: While conducting early detection monitoring for invasive European green
 crab (Carcinus maenas), Washington Sea Grant Crab Team discovered a
 non-native shrimp Palaemon macrodactylus, hitherto unreported along
 Washington's portion of the Salish Sea. By examining prior data, and
 tracking this species closely over subsequent years, we were able to
 consistently monitor the spread and increase of this species across the
 region. The program and dataset enabled a highly quality-controlled and
 verified record of this species. Originating near the Canadian border, P.
 macrodactylus has spread southward into the main basins of Puget Sound and
 has been observed in Hood Canal as well. At sites where this shrimp has
 been consistently documented, the relative abundance over time has
 increased, indicating that the invasion has become established but not yet
 reached equilibrium. Similar to studies in other regions of the globe
 where it is found, we observed that P. macrodactylus favors estuarine
 habitats and demonstrates seasonal migration within creek systems. The
 Salish Sea population is within demographic values published for other
 invasions, but females achieve a smaller maximum size, and reproductive
 maturity at a smaller size than those reported from the native range. This
 might suggest the potential for an altered life history strategy favored
 by an introduction to a novel evolutionary context. Given the rate of
 spread over the last decade and the density of suitable habitat, we
 anticipate that P. macrodactylus will continue to expand its range within
 the Salish Sea. No ecological impacts of this species have been documented
 elsewhere. Nevertheless, this approach demonstrates the benefit of
 participatory science monitoring in tracking cryptic or otherwise
 unnoticed species invasions.
description: # Tracking two invasions for the cost of one: Opportunistically tracking
 the range expansion of non-native Palaemon macrodactylus in the Salish Sea
 through participatory science
 [https://doi.org/10.5061/dryad.sqv9s4ndp](https://doi.org/10.5061/dryad.sqv9s4ndp) ## Description of the data and file structure This dataset was compiled in November 2024 to research the spread of the non-native shrimp, *Palaemon macrodactylus*, in the Washington portion of the Salish Sea. Two data sources were utilized: * The Washington Sea Grant Crab Team monitoring network: wsg.uw.edu/crabteam * A European green crab trapping dataset compiled by the Washington Department of Fish and Wildlife and staff at the Northwest Straits Commission for Drayton Harbor and Samish Bay, WA. Full study descriptions are available in the manuscript: Grason et al. 2025 Frontiers in Marine Science. ### Files and variables For all records the value NULL reflects no relevant information or data available. **Data Files**: * Network PAMA CPUE.Map.csv: Total shrimp (*P. macrodactylus *abbreviated as PAMA) captured by year across all Crab Team monitoring sites active for that year * PAMA Specimen Measurements.csv: Individual specimen measurements for 753 PAMA photographed and measured by Jessica Pineda for Carapace Length (CL), Total Length (TL), and Vazquez total length (GVTL). Measurements in mm. Also sex, ovigery and egg condition. * WDFW.PAMA 2021-2022: Trap effort data from WDFW-led removal trapping for Drayton Harbor and Samish Bay in 2021 and 2022. * PAMA.Month.CPUE.csv: For all sites within the Crab Team network, monthly sample effort (number of traps) and PAMA from start to 202 #### File: WDFW\.PAMA\_2021\_-2022.csv **Description:** Trapping data from Drayton Harbor and Samish Bay 2020 and 2021 collected by collaborative Washington Department of Fish and Wildlife and Northwest Straits Commission Staff effort. Each row is a single trap set, though some fields/attributes are at the effort level (e.g. dates, time, Effort_Type, Weather, Trap_Effort) ##### Variables * Effort_Type: Type of green crab trapping effort * Date_Deployed: Date trap was placed in water * Date_Retrieved: Date trap was retrieved  * StartTime_Deployed: Start Time for trap deployments for multiple traps in string * EndTime_Deployed: End Time for trap deployments for multiple traps in string * StartTime_Retrieved: Start Time for trap retrieval for multiple traps in string * EndTime_Retrieved: End Time for trap retrieval for multiple traps in string * Weather: General weather condition * Personnel: Individuals in field reporting data * Management_Area: WDFW delineated management area related to green crab * Waterbody: Name of water body in which trap was located * Site_ID: Site number (if known and assigned by Washington Sea Grant) * Site_Name: Name of Site * Index: Location relative to stream flow for index sites * DistanceMouth: Linear distance (m to creek mouth) * Site_Info: Details of effort purpose * County: County of trapping effort * Trap_Effort: Total number of traps deployed of effort * Trap_Type: Individual type of trap used * Trap_Number: ID number for trap * Trap_Info: Secondary site location * Bait: Type of bait used * Latitude: Latitude Decimal degree WGS 84 * Longitude: Longitude Decimal degree WGS 84 * Date_Checked: Date of trap check * Year: Year of deployment * PAMA Present: Logical, Were PAMA (*Palaemon macrodactylus*) present in this trap? * PAMA: *Palaemon macrodactylus*, Number  * Other_Bycatch: Other species not listed as fields * Mortalities: Number of dead animals in trap * Notes: Notes * Data_Source: * TrackedChanges: #### File: PAMA.Month.CPUE.csv **Description:** Monthly site total number of *Palaemon macrodactylus* trapped as part of Washington Sea Grant Crab Team monitoring network monthly monitoring. Each row is a site by month sample. ##### Variables * SiteID: Site number within WSG Crab Team monitoring network * month: Month number of sampling * Year: Year number of sampling * trap.sets: total number of traps set as part of effort, default is 3 minnow and 3 fukui, though occasionally less if a trap is compromised and removed. * total.pama: total number of *Palaemon macrodactylus* in trap * CPUE: Catch per unit effort of *Palaemon macrodactylus* for monthly sample as shrimp per 100 trap sets. Calculated as total.pama*100/trap.sets #### File: Network\_PAMA\_CPUE.Map.csv **Description:** Annual total of *Palaemon macrodactylus* captured in Washington Sea Grant Crab Team monitoring network sampling by site. Each row/record is an aggregate of site data for the sampling year. ##### Variables * SiteID: Site number within WSG Crab Team monitoring network * Year: Year number of sampling * trap.sets: total number of traps set as part of effort, default is 3 minnow and 3 fukui, though occasionally less if a trap is compromised and removed. * total.pama: total number of *Palaemon macrodactylus* in trap * CPUE: Catch per unit effort of *Palaemon macrodactylus* for monthly sample as shrimp per 100 trap sets. Calculated as total.pama*100/trap.sets * LatitudeDD: Latitude Decimal degree WGS 84 * LongitudeDD: Longitude Decimal degree WGS 84 #### File: PAMA\_Specimen\_Measurements.csv **Description:** Biometric and sample data for individual *Palaemon macrodactylus* specimens. Each row/record is data associated  with an individual shrimp specimen ##### Variables * PAMAID: Unique specimen identifier * WaterBody : Name of water body where shrimp originated * Site: Number or general name of site where shrimp originated * SiteName: Secondary Site Name * CollectionDate: Date shrimp was captured * Month: Month shrimp was captured * Year: Year shrimp was captured * Gear: Type of gear used to collect shrimp * EffortType: Type of search effort under which shrimp was captured * Species: Confirmation of species identity (PAMA= *Palaemon macrodactylus* ) * Sex: Sex of shrimp * Gravid: For female shrimp, was shrimp carrying eggs (ovigerous), should be NA for males * EggsEyes: Egg stage estimate for gravid shrimp, did shrimp eggs have visible eyes * Curvy: Methological note, was shrimp difficult to pin for photographing/measurement * CL: Carapace length (mm) as defined in Grason et al. 2025 * GVTL: Guadelupe Vazquez Carapace length (mm) as defined in Grason et al. 2025 * TL: Total length (mm) as defined in Grason et al. 2025 * Disposed: Was shrimp disposed * Date Dissected: Date of shrimp evaluation and photography * Notes: Additional condition notes ## Access information Other publicly accessible locations of the data: * wsg.uw.edu/crabteam * [https://public.tableau.com/app/profile/matt.chadsey/viz/CrabTeamV2_5/Summary_Program?publish=yes](https://public.tableau.com/app/profile/matt.chadsey/viz/CrabTeamV2_5/Summary_Program?publish=yes)