Dataset: In situ temperature measurements from eelgrass meadow field sites along the west coast of North America recorded from July 2019 to July 2021

In-situ temperature measurements
As part of field surveys to measure effects of eelgrass wasting disease, HOBO temperature loggers were deployed to provide a continuous record of in situ temperatures.

Temperature loggers (HOBO MX 2201 and UA-001-64, Onset, Bourne, MA) were deployed at each eelgrass meadow site.  Loggers were secured to metal stakes in the sediment, resting approximately 2 cm above the sediment surface. To provide a continuous record of in situ temperature, loggers were swapped out during surveys as needed. 

Field surveys
Field surveys of eelgrass meadow sites were conducted at mid-summer low tides at field sites along the west coast of North America in the U.S. and Canada. Samples and data were collected within the intertidal area of 32 eelgrass meadows distributed in six regions (Alaska, British Columbia, Washington, Oregon, California -Bodega Bay, and California -San Diego). Surveys were conducted between late June and early August in 2019, 2020, and 2021 by teams from six institutions.

For each site, three 20 meter transects were laid parallel to the shore at the shoreward/upper edge of continuous eelgrass, and three lower/ intertidal 20 meter transects were laid at least 4 meters closer to the water.  To assess disease impacts, eelgrass blades and shoots were collected for analysis at each meter along the transect. Shoot density and canopy cover were measured at the same 4 meter intervals. See Related datasets section for 'Shoot Metrics', 'Shoot Density', and 'Eelgrass Disease Metrics'.  

Salinity was measured at the time of sampling using a refractometer. Transect locations were recorded using a hand-held GPS (exact model varied between field locations).