Effects of Nutrient Availability on the Thermal Optima and Sensitivities of Galápagos Seaweeds

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  • October 17, 2023
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  • Capone, Haley Elizabeth
    • Affiliation: College of Arts and Sciences, Department of Biology
Abstract
  • Thermal sensitivity in ectothermic organisms is highly context-dependent and may explain the varied responses to climate change among species and with ambient environmental conditions. As such, there is renewed interest to examine the potential combined effects of local factors (i.e., nutrients) and global temperature on thermal biology. This study was conducted to determine whether nutrients influence the thermal optima and sensitivities (estimated as the Topt, and slope values E and Eh, respectively) of four genera of Galápagos seaweeds (Padina, Caulerpa, Ulva, and Ochtodes) through estimating thermal performance curves for respiration (R) and net photosynthesis (NP). The thermal optimum varied substantially across taxa (27.6-36 °C) and was enhanced ~2 °C under nutrient additions in Padina and Caulerpa genera. Ulva spp. displayed reduced sensitivity to higher temperatures under enrichment. Lastly, NP across taxa showed lower optimal temperatures than R, suggesting further warming could reduce primary productivity, with potentially far-reaching implications for marine food webs.
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  • Bruno, John F.
  • Brandt, Margarita
  • McCoy, Sophie J.
Degree
  • Master of Science
Degree granting institution
  • University of North Carolina at Chapel Hill Graduate School
Graduation year
  • 2023
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