DOI: 10.5061/dryad.79cnp5hwg
title: Data from: Weather and topography regulate the benefit of a conditionally helpful parasite

description: Heat-induced mass mortalities involving ecosystem engineers may have
 long-lasting detrimental effects at the community level, eliminating the
 ecosystem services they provide. Intertidal mussels are ecologically and
 economically valuable with some populations facing unprecedented
 heat-induced mass mortalities. Critically, mussels are also frequently
 infested by endolithic parasites that modify shell albedo, hence reducing
 overheating and mortality rates under heat stress. Using a biophysical
 model, we explored the topographical and meteorological conditions under
 which endolithically-driven thermal buffering becomes critical to
 survival. Based on meteorological data from a global climate analysis, we
 modelled body temperatures of infested and non-infested mussels over the
 last decade (2010-2020) at nine sites spread across ca. 20° of latitude.
 We show that thermal buffering is enhanced where and when heat stress is
 greatest, that is, on sun-exposed surfaces under high solar radiation and
 high air temperature. These results suggest that new co-evolutionary
 pathways are likely to open for these symbiotic organisms as climate
 continues to change, potentially tipping the balance of the relationship
 from a parasitic to a more mutualistic one. However, endolithically-driven
 reductions in body temperatures can also occur at or below optimal
 temperatures, thereby reducing the host’s metabolic rates and making the
 interplay of positive and negative effects complex. In parallel, we
 hindcasted body temperatures using empirical data from nearby weather
 stations and found that predictions were very similar with those obtained
 from two global climate reanalyses (i.e., NCEP-DOE Reanalysis 2 and ECMWF
 Reanalysis v5). This result holds great promise for modelling the
 distribution of terrestrial ectotherms at ecologically relevant
 spatiotemporal scales, as it suggests we can reasonably bypass the
 practical issues associated with weather stations. For intertidal
 ectotherms, however, the challenge will be incorporating body temperatures
 over the full tidal cycle.
description: The term “robomussel”
 refers to a biomimetic sensor which contains a temperature logger glued
 between shells of the mussel <i>Mytilus galloprovincialis</i>.
 Robomussels were deployed within the mid mussel zone on a relatively flat
 surface (&lt; 20°). For each pair of robomussel, both types (i.e.,
 built with either infested or non-infested shells) were placed close to
 each other (ca. 10 cm). Raw temperature data for each logger are placed
 end to end in this table. Pairs of robomussels were deployed in Portugal,
 France, and the United Kingdom: Viana do Castelo (VIA, n = 3 pairs), Monte
 Clerigo (MON, n = 3 pairs), Vilamoura (VIL, n = 3 pairs), Wimereux (WIM, n
 = 6 pairs), Locquémeau (LOC, n = 3 pairs), Pointe Saint-Gildas (GIL, n = 4
 pairs), Nebogeo (NEB, n = 3 pairs), Bay of Skaill (SKA, n = 3 pairs),
 Aberffraw (ABE, n = 3 pairs). Details on locations and deployment periods
 are given below (each row: site|latitude, longitude|deployment
 period). NEB|59.066536,
 -3.349536|2017-08-01 to 2017-09-13 SKA|59.057077,
 -3.342629|2017-08-01 to 2017-09-13 ABE|53.182441,
 -4.489719|2018-07-27 to 2018-09-08 WIM|50.752994,
 1.595021|2017-08-01 to 2017-09-13 LOC|48.724919,
 -3.589641|2017-08-01 to 2017-09-13 GIL|47.134162,
 -2.250199|2017-08-01 to 2017-09-13 VIA|41.699471,
 -8.857048|2017-08-01 to 2017-09-13 MON|37.341377,
 -8.854512|2017-08-01 to 2017-09-13 VIL|37.070756,
 -8.122935|2017-08-01 to 2017-09-13
description: <b>File</b>
 RobomusselData.csv
 <b>Description</b> RobomusselData.csv - This file contains a table with seven columns: "<b>site</b>" contains the full name of each study site. "<b>site_code</b>" contains the short name of each study site. "<b>robomussel_pair</b>" contains the identification number of each pair of robomussels. "<b>robomussel_type</b>" contains the type of robomussel (either non-infested when using clean shells or infested if using shells already degraded by endoliths). "<b>datetime_GMT0</b>" contains the dates and times at which temperatures were recorded (format: yyyy-mm-dd hh:mm:ss and time zone: UTC±00:00). "<b>temperature_DegC</b>" contains temperatures recorded in degrees Celsius every 30 minutes by loggers inserted into robomussels.