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Light respiration by subtropical seaweeds.

Matheus C Carvalho1, Bradley D Eyre1

  • 1Centre for Coastal Biogeochemistry Research, School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW, 2480, Australia.

Journal of Phycology
|March 22, 2017
PubMed
Summary

This study presents the first measurements of light carbon dioxide respiration rate (CRR) in seaweeds. Temperature significantly impacts CRR, while light has minimal effect, suggesting existing methods accurately estimate seaweed photosynthesis.

Keywords:
13Ccarbonphotosynthesisrespirationshort-term incubation

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Area of Science:

  • Marine Botany
  • Algal Physiology
  • Photosynthesis Research

Background:

  • Seaweeds play a crucial role in marine carbon cycles.
  • Understanding carbon dioxide respiration rate (CRR) in seaweeds is vital for accurate ecosystem modeling.
  • Previous research has primarily focused on oxygen-based measurements.

Purpose of the Study:

  • To report the first measurements of light carbon dioxide respiration rate (CRR) in seaweeds.
  • To investigate the influence of temperature and light intensity on seaweed CRR.
  • To compare light CRR with dark oxygen consumption rate (OCR) across multiple species.

Main Methods:

  • Measured light carbon dioxide respiration rate (CRR) in two subtropical seaweed species across a temperature range of 15-25°C and light irradiances (60-670 μmol·m⁻²·s⁻¹).
  • Assessed CRR in seven seaweed species under standardized conditions (150 μmol·m⁻²·s⁻¹ light, 25°C).
  • Compared light CRR with dark oxygen consumption rate (OCR) for different species.

Main Results:

  • Light CRR showed minimal sensitivity to changes in light irradiance.
  • Temperature had a noticeable effect on light CRR.
  • Light CRR generally mirrored dark oxygen consumption rates (OCR) across species, with a notable exception in a calcifying coralline alga.
  • The elevated CRR in the coralline alga was attributed to its calcification process.

Conclusions:

  • Light CRR in seaweeds is primarily influenced by temperature rather than light intensity.
  • Light CRR can be reliably estimated from dark oxygen consumption rates (OCR) in most seaweed species.
  • Previous studies likely provided accurate estimations of gross photosynthesis by using oxygen-based measurements.