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Thermal performance curves for Lessonia corrugata

Created 13/03/2025

Updated 13/03/2025

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Kelps are in global decline due to climate change, including ocean warming. To identify vulnerable species, we need to identify their tolerances to increasing temperatures and whether tolerances are altered by co-occurring drivers such as inorganic nutrient levels. This is particularly important for those with restricted distributions, which may already be experiencing thermal stress. To identify thermal tolerance of the range restricted kelp Lessonia corrugata, we conducted a laboratory experiment on juvenile sporophytes to measure performance (growth, photosynthesis) across its thermal range (4 – 22 °C). We found the upper thermal limit for growth and photosynthesis to be ~ 22 – 23 °C, with an optimum of ~ 16 °C. To determine if elevated inorganic nitrogen availability could enhance thermal tolerance, we compared performance of juveniles under low (4.5 µmol/day) and high (90 µmol/day) nitrate conditions at and above the thermal optimum (16 – 23.5 °C). Nitrate enrichment did not enhance thermal performance at temperatures above the optimum but did lead to elevated growth rates at the thermal optimum 16 °C. Our findings indicate L. corrugata is likely to be extremely susceptible to moderate ocean warming and marine heatwaves. Peak sea surface temperatures during summer in eastern and northeastern Tasmania can reach up to 20 – 21 °C and climate projections suggest that L. corrugata’s thermal limit will be regularly exceeded by 2050 as south-eastern Australia is a global ocean-warming hotspot. By identifying the upper thermal limit of L. corrugata we have taken a critical step in predicting the future of the species in a warming climate.

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Title Thermal performance curves for Lessonia corrugata
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/68af5af9-ba24-4130-bbc6-09a85e702807
Contact Point
CSIRO Oceans & Atmosphere
cody.james@utas.edu.au
Reference Period 01/01/2022 - 01/12/2022
Geospatial Coverage {"type": "Polygon", "coordinates": [[[147.32496, -43.33466000000001], [147.32497, -43.33466000000001], [147.32497, -43.33465], [147.32496, -43.33465], [147.32496, -43.33466000000001]]]}
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "Thermal performance curves for Lessonia corrugata". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/thermal-performance-curves-for-lessonia-corrugata

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