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<p>The kelps <i>Eisenia arborea</i>, <i>Macrocystis pyrifera</i>, and <i>Pterygophora californica</i> are foundation species in the Eastern North Pacific, with their latitudinal limits extending to the Baja California peninsula (Mexico). In comparison to the other species, <i>E. arborea</i> exhibits a higher level of thermo-tolerance. This is attributable to the fact that its southernmost populations are located in warmer waters, and are able to persist thermal anomalies associated with marine heatwaves (MHWs) and ENSO. The objective of this study was to ascertain whether the physiological responses of gametophytes mirror this apparent difference in thermo-tolerances among these species. A laboratory experiment was conducted, by which the photobiology and respiration of gametophytes of the three species were compared when exposed to warm conditions simulating a MHW (20 ⁰C for six days), followed by a post-MHW phase (14 ⁰C for six days). The increase in temperature had no impact on the photosynthetic capacities of the three species; however, it did result in an elevated respiratory activity, which consequently led to an increase in the compensation irradiance. Subsequent to the termination of the warming period, <i>E. arborea</i> did not exhibit signs of physiological stress, while the photosynthetic capacities of <i>M. pyrifera</i> underwent a decline. The respiration rates and compensation irradiance of <i>E. arborea</i> and <i>M. pyrifera</i> recovered, but not in P. <i>californica</i>. The apparent absence of metabolic stress in <i>E. arborea</i> following the cessation of warming suggests a higher degree of resistance to MHWs. This enhanced physiological resilience in gametophytes can contribute to the observed elevated thermal resistance in <i>E. arborea</i>, and underscore its acclimation capacity in the face of warming events.</p>

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Comparative photophysiology and respiration of Kelp gametophytes reveals species-specific thermo-tolerance to marine heatwaves

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Antonella C. Almeida-Saá,
  • Schery Umanzor,
  • Jose Antonio Zertuche-González,
  • Ricardo Cruz-López,
  • Alejandra Ferreira-Arrieta,
  • Laura K. Rangel-Mendoza,
  • Jose Miguel Sandoval-Gil

摘要

The kelps Eisenia arborea, Macrocystis pyrifera, and Pterygophora californica are foundation species in the Eastern North Pacific, with their latitudinal limits extending to the Baja California peninsula (Mexico). In comparison to the other species, E. arborea exhibits a higher level of thermo-tolerance. This is attributable to the fact that its southernmost populations are located in warmer waters, and are able to persist thermal anomalies associated with marine heatwaves (MHWs) and ENSO. The objective of this study was to ascertain whether the physiological responses of gametophytes mirror this apparent difference in thermo-tolerances among these species. A laboratory experiment was conducted, by which the photobiology and respiration of gametophytes of the three species were compared when exposed to warm conditions simulating a MHW (20 ⁰C for six days), followed by a post-MHW phase (14 ⁰C for six days). The increase in temperature had no impact on the photosynthetic capacities of the three species; however, it did result in an elevated respiratory activity, which consequently led to an increase in the compensation irradiance. Subsequent to the termination of the warming period, E. arborea did not exhibit signs of physiological stress, while the photosynthetic capacities of M. pyrifera underwent a decline. The respiration rates and compensation irradiance of E. arborea and M. pyrifera recovered, but not in P. californica. The apparent absence of metabolic stress in E. arborea following the cessation of warming suggests a higher degree of resistance to MHWs. This enhanced physiological resilience in gametophytes can contribute to the observed elevated thermal resistance in E. arborea, and underscore its acclimation capacity in the face of warming events.