Combined effects of marine heatwaves and reduced light on the physiology and growth of the surfgrass Phyllospadix torreyi from Baja California, Mexico

Bercovich, Manuel Vivanco; Belando-Torrentes, María Dolores; Figueroa-Burgos, María Fernanda; Ferreira-Arrieta, Alejandra; Macías-Carranza, Víctor; García-Pantoja, Jessica Anayansi; Cabello‐Pasini, Alejandro; Samperio-Ramos, Guillermo; Cruz-López, Ricardo; Sandoval‐Gil, Jose Miguel

doi:10.1016/j.aquabot.2021.103488

Cited by 3 publications

(2 citation statements)

References 69 publications

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“…This outcome presents an opportunity for future restoration strategies, such as transplanting deep‐water sporophytes to revitalize damaged shallow Pterygophora californica beds or exploring their potential as a source of reproductive propagules for natural repopulation, as seen in other kelp species (e.g., Ecklonia radiata ; Giraldo‐Ospina et al., 2023). Notably, most effects and responses were observed after MHW cessation, aligning with studies on other macrophytes (Marín‐Guirao et al., 2016; Umanzor et al., 2021; Vivanco‐Bercovich et al., 2022) and indicating a delayed response to heat stress. Our results emphasize the need for extended experimental periods to comprehend seaweed's physiological tolerance and resilience capacities within the context of MHWs.…”

Section: Discussionsupporting

confidence: 82%

“…However, in the post‐MHW phase, these sporophytes displayed enhanced photosynthetic capability and daily productivity due to increased values of gross‐P max , α, and E c . This stimulation of photosynthesis may result from positive warming effects that are delayed and impact various related processes, including the activity of enzymes involved in carbon assimilation and the mobility of proteins in the thylakoid membranes (Andersen et al., 2013; Shindo et al., 2022; Vivanco‐Bercovich et al., 2022; Wernberg et al., 2016). The unaltered values of F v / F m , ETR, and NPQ recorded during both the experimental periods (MHW and post‐MHW) point toward the functional and structural integrity of the photosynthetic apparatus (Murchie & Lawson, 2013; Sánchez‐Barredo et al., 2020; Umanzor et al., 2021), thereby sustaining the positive photosynthetic response of deep‐water sporophytes.…”

Section: Discussionmentioning

confidence: 99%

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Bathymetric origin shapes the physiological responses of Pterygophora californica (Laminariales, Phaeophyceae) to deep marine heatwaves

Almeida‐Saá,

Umanzor,

Zertuche‐González

et al. 2024

Journal of Phycology

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Kelp communities are experiencing exacerbated heat‐related impacts from more intense, frequent, and deeper marine heatwaves (MHWs), imperiling the long‐term survival of kelp forests in the climate change scenario. The occurrence of deep thermal anomalies is of critical importance, as elevated temperatures can impact kelp populations across their entire bathymetric range. This study evaluates the impact of MHWs on mature sporophytes of Pterygophora californica (walking kelp) from the bathymetric extremes (8–10 vs. 25–27 m) of a population situated in Baja California (Mexico). The location is near the southernmost point of the species's broad distribution (from Alaska to Mexico). The study investigated the ecophysiological responses (e.g., photobiology, nitrate uptake, oxidative stress) and growth of adult sporophytes through a two‐phase experiment: warming simulating a MHW and a post‐MHW phase without warming. Generally, the effects of warming differed depending on the bathymetric origin of the sporophytes. The MHW facilitated essential metabolic functions of deep‐water sporophytes, including photosynthesis, and promoted their growth. In contrast, shallow‐water sporophytes displayed metabolic stress, reduced growth, and oxidative damage. Upon the cessation of warming, certain responses, such as a decline in nitrate uptake and net productivity, became evident in shallow‐water sporophytes, implying a delay in heat‐stress response. This indicates that variation in temperatures can result in more prominent effects than warming alone. The greater heat tolerance of sporophytes in deeper waters shows convincing evidence that deep portions of P. californica populations have the potential to serve as refuges from the harmful impacts of MHWs on shallow reefs.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Bathymetric origin shapes the physiological responses of Pterygophora californica (Laminariales, Phaeophyceae) to deep marine heatwaves

Almeida‐Saá,

Umanzor,

Zertuche‐González

et al. 2024

Journal of Phycology

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Combined effects of high irradiance and temperature on the photosynthetic and antioxidant responses of Thalassia hemprichii and Halophila ovalis

2022

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During midday low tides, tropical intertidal seagrasses are challenged by high irradiance and high temperature. This study assessed photosynthetic and oxidative stress responses of Thalassia hemprichii and Halophila ovalis exposed to 150 and 1000 μmol photons m−2 s−1 and 30 and 40 °C for 3 h. High temperature (40 °C) significantly decreased the maximum quantum yield of both seagrasses and this heat-induced photoinhibition was exacerbated by high irradiance (1000 μmol photons m−2 s−1). High irradiance also aggravated the effects of high temperature on the effective quantum yield of T. hemprichii. Non-photochemical quenching (NPQ) of T. hemprichii was induced by both stressors with no additive effects. In contrast, NPQ of H. ovalis was induced under high irradiance at 30 °C but was inhibited at 40 °C. Nevertheless, antioxidant enzyme activity and reactive oxygen species content did not differ among treatments in either seagrass. Monitoring chloroplast distribution in H. ovalis revealed a partial inhibitory effect of high temperature on chloroplast avoidance movement under high irradiance. Our results suggest that warming events may cause detrimental impacts on shallow water seagrasses. Halophila ovalis may be more vulnerable than T. hemprichii as its photoprotection, i.e. NPQ and chloroplast avoidance movement, was hindered at high temperature.

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Sulfated Flavonoids in Surfgrasses (Genus Phyllospadix) from Baja California, Mexico

Rodríguez-Hernández,

Sandoval-Gil,

Enerstvedt

et al. 2024

Preprint

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Combined effects of marine heatwaves and reduced light on the physiology and growth of the surfgrass Phyllospadix torreyi from Baja California, Mexico

Cited by 3 publications

References 69 publications

Bathymetric origin shapes the physiological responses of Pterygophora californica (Laminariales, Phaeophyceae) to deep marine heatwaves

Bathymetric origin shapes the physiological responses of Pterygophora californica (Laminariales, Phaeophyceae) to deep marine heatwaves

Combined effects of high irradiance and temperature on the photosynthetic and antioxidant responses of Thalassia hemprichii and Halophila ovalis

Sulfated Flavonoids in Surfgrasses (Genus Phyllospadix) from Baja California, Mexico

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