Thermal affinities for European marine species | Emodnet Biology

Thermal affinities for European marine species

Introduction

This data product shows how to derive, summarise and visualise thermal affinities for European marine species. This work is supported by EMODnet biology with additional support to TJW during development of these methods provided by the UK Marine Ecosystems Research Programme.

The aim is to derive thermal affinities for all European marine species, by matching occurrence records from OBIS to gridded temperature products. These species-level thermal affinities are then used to produce assemblage-level averages on a 0.5º grid covering European seas, separately for major functional groups (e.g. benthos, zooplankton, fish). Finally these gridded assemblage-level averages are compared to current and projected future sea temperatures to identify areas of high climate vulnerability for each functional group.

This webpage gives only a summary of the data, workflow and products. A complete overview is given at the EMODnet Biology github page of this product

Data series

The European species list was derived on the basis of occurrence records in OBIS. This data comes from EurOBIS and the EMODnet Biology portal.

The obtained functional groups functional groups for these species using attributes from WoRMS using the worrms package.

Thermal affinities were derived from all European marine species using a suite of functions described and justified in full here: https://github.com/tomjwebb/marine_thermal_traits. Briefly, for each species, all global occurrences were extracted from OBIS, these were then matched in space (latitude, longitude) to a global temperature climatology (SST and SBT from Bio-ORACLE SST and SBT, obtained using the sdmpredictors package), and in space, time (month, year), and sample depth to a global gridded temperature product (Institute of Atmospheric Physics, IAP gridded temperature). Temperatures were then summarised to provide a range of thermal affinity measures for each species (including mean, min, max, 5th and 95% quantiles, for each temperature measure).

Data  product

The product is a table with the thermal affinities of each species, which can be grouped by functional group to obtain 'community level thermal affinities'.

With this information, we can compare the functional group-level temperature affinities to current and projected future temperature and create maps.

For example, the map below shows the temperature affinity of benthos, derived using mean sea bottom temperature:

Map of the temperature affinity of benthos, derived using mean sea bottom temperature

map of the temperature affinity of benthos, derived using mean sea bottom temperature

The map below shows the difference between mean zooplankton thermal affinity based on mean sea surface temperature (SST) and expected maximum SST in 2050:

Map showing the difference between mean zooplankton thermal affinity based on mean sea surface temperature (SST) and expected maximum SST in 2050

Map showing the difference between mean zooplankton thermal affinity based on mean sea surface temperature (SST) and expected maximum SST in 2050

 

More information

Code and workflow

A complete overview of the data, workflow and products is available at the EMODnet Biology github page of this product:

https://github.com/EMODnet/EMODnet-Biology-thermal-traits

Author

Product created by Tom J. Webb

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