Ecophysiological measurements from thermal tolerance testing of giant kelp (NESP MaC 1.28)
This record described kelp growth and ecophysiological data relevant to the thermal tolerance of specific warm-tolerant and 'normal' family-lines of giant kelp (Macrocystis pyrifera) from Tasmania, Australia.
For habitat restoration to be effective, the cause of habitat decline must be understood and overcome. But this is problematic when climate change is driving habitat loss, since it cannot be reversed or ameliorated prior to restoration.
A previous NESP project, led by this team, identified warmwater-tolerant strains of giant kelp (Macrocystis pyrifera) from remnant patches in eastern Tasmania, where the species has experienced severe declines over the past half-century due to climate change and ocean-warming. While these strains have high potential to assist with ‘future-proofing’ of kelp forest restoration activities, it is still unclear what the physiological mechanisms are that provide their improved thermal tolerance.
Here we cultivated the warm-tolerant giant kelp strains, along with giant kelp strains of normal tolerance, at both cool (16 °C) and warm temperatures (20 °C). We then harvested the juvenile kelp, and examined a suite of physiological traits that may be responsible for their differences in thermal tolerance, including nutrient usage (carbon and nitrogen content), cellular membrane processes (fatty acid contents), and photosynthesis (PAM fluorometry and photosynthetic pigments).
The cultivation trials again illustrated the improved ability of the warm-tolerant strains to develop at stressful warm temperatures relative to normal giant kelp. For the first time, we also demonstrate that their improved thermal performance may extend to the development and fertilisation of the earlier kelp ‘gametophyte’ life-stage. Despite the clear differences in growth between the two test groups, the physiological assessments illustrated a complex pattern of responses, some of which are contrary to expected based on prior knowledge of thermal performance in kelps. Nonetheless, our results indicate that the warm-tolerant strains of giant kelp have a greater capacity to alter the composition of their fatty acids and may be more efficient users of nitrogen (a key nutrient for growth and development).
This new information will help inform ongoing kelp breeding and selection programs for future-proofing kelp restoration in Australia and globally. This improved understanding of the physiology of kelp thermal tolerance might also help with identifying individuals and populations of Macrocystis, and other kelps, that may be resilient to (or especially threatened by) ocean warming and climate change.
Simple
Identification info
- Date (Creation)
- 2022-10-24
Identifier
- Title
- Information and documentation - Digital object identifier system
- Citation identifier
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ISO 26324:2012
- Code
- 10.25959/61A2-A148
- Codespace
- doi.org
- Description
- Digital Object Identifier (DOI)
Principal investigator
- Status
- complete
Point of contact
- Topic category
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- Biota
Extent
Temporal extent
- Time period
- 2021-07-31 2022-07-31
- Maintenance and update frequency
- none-planned
Resource format
- Date
- Keywords (Theme)
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- ecophysiology
- future-proof
- National Environmental Science Program (NESP) Marine and Coastal Hub
- Keywords (Taxon)
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- Macrocystis pyrifera
- giant kelp
- NASA/GCMD Keywords, Version 8.5
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- EARTH SCIENCE | BIOSPHERE | ECOSYSTEMS | MARINE ECOSYSTEMS | COASTAL | KELP FOREST
- EARTH SCIENCE | HUMAN DIMENSIONS | HABITAT CONVERSION/FRAGMENTATION | RECLAMATION/REVEGETATION/RESTORATION
- EARTH SCIENCE | BIOSPHERE | ECOSYSTEMS | MARINE ECOSYSTEMS
- EARTH SCIENCE | BIOSPHERE | ECOLOGICAL DYNAMICS | SPECIES/POPULATION INTERACTIONS | ENDANGERED SPECIES
- EARTH SCIENCE | BIOLOGICAL CLASSIFICATION | PLANTS | MACROALGAE (SEAWEEDS)
Resource constraints
- Other constraints
- This dataset is hosted by the Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, on behalf of NESP Marine and Coastal Hub Project 1.28.
Resource constraints
- Classification
- Unclassified
Resource constraints
- Use limitation
- Data was sourced from the NESP Marine and Coastal Hub – the Marine and Coastal Hub is supported through funding from the Australian Government’s National Environmental Science Program (NESP), administered by the Department of Agriculture, Water and the Environment (DAWE).
Resource constraints
- Linkage
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http://i.creativecommons.org/l/by/4.0/88x31.png
License Graphic
- Title
- Creative Commons Attribution 4.0 International License
- Website
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http://creativecommons.org/licenses/by/4.0/
License Text
- Other constraints
- Cite data as: Layton, C., Eva, S., & Johnson, C. (2022). Ecophysiological measurements from thermal tolerance testing of giant kelp [Data set]. Institute for Marine and Antarctic Studies. https://doi.org/10.25959/61A2-A148
- Language
- English
- Character encoding
- UTF8
- Supplemental Information
- Layton C, Smid E, Johnson CR (2022) A physiological assessment of giant kelp (Macrocystis pyrifera) strains that exhibit warm tolerance. Report to the National Environmental Science Program. University of Tasmania. Layton C & Johnson CR (2021). Assessing the feasibility of restoring giant kelp forests in Tasmania. Report to the National Environmental Science Program, Marine Biodiversity Hub. Institute for Marine and Antarctic Studies, University of Tasmania.
Distribution Information
- Distribution format
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excel
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excel
Resource lineage
- Statement
- Building on a prior successful NESP Marine Biodiversity Hub Project E7 and leveraging pre-existing kelp cultures (Layton & Johnson 2021), this project explored potential mechanism(s) underpinning the thermal tolerance of previously identified warm-tolerant giant kelp strains, including their nutrient usage (carbon and nitrogen content), cellular membrane processes (fatty acid contents), and photosynthesis (PAM fluorometry and photosynthetic pigments).
- Hierarchy level
- Dataset
Metadata
- Metadata identifier
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urn:uuid/18979422-134c-4a18-a2f1-2c4cde0ed0f8
- Language
- English
- Character encoding
- UTF8
Point of contact
Type of resource
- Resource scope
- Dataset
- Metadata linkage
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https://metadata.imas.utas.edu.au/geonetwork/srv/eng/catalog.search#/metadata/18979422-134c-4a18-a2f1-2c4cde0ed0f8
Point of truth URL of this metadata record
- Date info (Creation)
- 2015-05-06T11:44:25
- Date info (Revision)
- 2025-01-15T00:24:36
Metadata standard
- Title
- ISO 19115-3:2018