Photosynthesis and daily metabolic carbon balance of the invasive &lt;i&gt;Caulerpa racemosa&lt;/i&gt; var. &lt;i&gt;cylindracea&lt;/i&gt; (Chlorophyta: Caulerpales) along a depth gradient

Bernardeau-Esteller, Jaime; Marín-Guirao, Lázaro; Sandoval‐Gil, Jose Miguel; Ruiz, Juan Manuel García

doi:10.3989/scimar.2011.75n4803

Cited by 8 publications

(2 citation statements)

References 43 publications

(65 reference statements)

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“…For its part, juvenile sporophytes of Macrocystis pyrifera can show lower respiratory activity when growing deeper during short‐term (days) culture (Umanzor et al, 2000). Umanzor et al interpreted this lowered R as a compensatory mechanism that reduced carbon losses and contributed to maintaining carbon balance under low light availability for photosynthesis, similar to that indicated for seaweeds growing deeper (e.g., Caulerpa racemosa , Bernardeau‐Esteller et al, 2011). In our study, the soluble carbohydrates concentration measured in M .…”

Section: Discussionmentioning

confidence: 69%

Shading by giant kelp canopy can restrict the invasiveness of Undaria pinnatifida (Laminariales, Phaeophyceae)

Sandoval‐Gil

Sánchez-Barredo

Cruz-López

et al. 2023

Journal of Phycology

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The spread of non-indigenous and invasive seaweeds has increased worldwide, and their potential effects on native seaweeds have raised concern. Undaria pinnatifida is considered among the most prolific non-indigenous species. This species has expanded rapidly in the Northeast Pacific, overlapping with native communities such as the iconic giant kelp forests (Macrocystis pyrifera). Canopy shading by giant kelp has been argued to be a limiting factor for the presence of U. pinnatifida in the understory, thus its invasiveness capacity. However, its physiological plasticity under light limitation remains unclear. In this work, we compared the physiology and growth of juvenile U. pinnatifida and M. pyrifera sporophytes transplanted to the understory of a giant kelp forest, to juveniles growing outside of the forest. Extreme low light availability compared to that outside (~0.2 and ~4.4 mol photon ⋅ m −2 ⋅ d −1 , respectively) likely caused a "metabolic energy crisis" in U. pinnatifida, thus restricting its photoacclimation plasticity and nitrogen acquisition, ultimately reducing its growth. Despite M. pyrifera juveniles showing photoacclimatory responses (e.g., increases in photosynthetic efficiency and lower compensation irradiance, E c ), their physiological/vegetative status deteriorated similarly to U. pinnatifida, which explains the low recruitment inside the forest. Generally, our results revealed the ecophysiological basis behind the limited growth and survival of juvenile U. pinnatifida sporophytes in the understory.

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Section: Discussionmentioning

confidence: 69%

Shading by giant kelp canopy can restrict the invasiveness of Undaria pinnatifida (Laminariales, Phaeophyceae)

Sandoval‐Gil

Sánchez-Barredo

Cruz-López

et al. 2023

Journal of Phycology

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“…As a result of a higher α, the compensation irradiance (E c ) is reduced, requiring less light for photosynthesis to balance respiration and achieve positive net metabolic productivity. The sporophytes' low respiratory activity optimizes carbon balance under light limitation (Bernardeau‐Esteller et al., 2011, 2015; Sandoval‐Gil et al., 2014; Umanzor et al., 2020).…”

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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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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Effects of Seven Antifouling Compounds on Photosynthesis and Inorganic Carbon Use in Sugar Kelp Saccharina latissima (Linnaeus)

Johansson

Eriksson

Axelsson

et al. 2012

Arch Environ Contam Toxicol

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Macroalgae depend on carbon-concentrating mechanisms (CCMs) to maintain a high photosynthetic activity under conditions of low carbon dioxide (CO(2)) availability. Because such conditions are prevalent in marine environments, CCMs are important for upholding the macroalgal primary productivity in coastal zones. This study evaluated the effects of seven antifouling compounds-chlorothalonil, DCOIT, dichlofluanid, diuron, irgarol, tolylfluanid, and zinc pyrithione (ZnTP)-on the photosynthesis and CCM of sugar kelp (Saccharina latissima (L.)). Concentration-response curves of these toxicants were established using inhibition of carbon incorporation, whereas their effects over time and their inhibition of the CCM were studied using inhibition of O(2) evolution. We demonstrate that exposure to all compounds except ZnTP (< 1000 nM) resulted in toxicity to photosynthesis of S. latissima. However, carbon incorporation and O(2) evolution differed in their ability to detect toxicity from some of the compounds. Diuron, irgarol, DCOIT, tolylfluanid, and, to some extent, dichlofluanid inhibited carbon incorporation. Chlorothalonil did not inhibit carbon incorporation but clearly inhibited oxygen (O(2)) evolution. Photosynthesis showed only little recovery during the 2-h postexposure period. Inhibition of photosynthesis even increased after the end of exposure to chlorothalonil and tolylfluanid. Through changes in pH of the medium, toxic effects on the CCM could be studied isolated from photosynthesis effects. The CCM of S. latissima was inhibited by chlorothalonil, DCOIT, dichlofluanid, and tolylfluanid. Such inhibition of the CCM, or the absence thereof, deepens the understanding the mechanism of action of the studied compounds.

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Photosynthesis and daily metabolic carbon balance of the invasive <i>Caulerpa racemosa</i> var. <i>cylindracea</i> (Chlorophyta: Caulerpales) along a depth gradient

Cited by 8 publications

References 43 publications

Shading by giant kelp canopy can restrict the invasiveness of Undaria pinnatifida (Laminariales, Phaeophyceae)

Shading by giant kelp canopy can restrict the invasiveness of Undaria pinnatifida (Laminariales, Phaeophyceae)

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

Effects of Seven Antifouling Compounds on Photosynthesis and Inorganic Carbon Use in Sugar Kelp Saccharina latissima (Linnaeus)

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