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4 results for “canopy-forming seaweeds”
Season-specific impacts of climate change on canopy-forming seaweed communities
<p><span>Understory assemblages associated with canopy-forming species such as trees, kelps, and rockweeds should respond strongly to climate stressors due to strong interaction strengths. Climate change can directly and indirectly modify these assemblages, particularly during more stressful seasons and climate scenarios. </span><span>However, fully understanding the seasonal impacts of different climate conditions on canopy-reliant assemblages is difficult due to a continued emphasis on studying single species responses to a single future climate scenario during a single season. To examine these more complex interactions, we used mesocosm experiments to expose intertidal assemblages associated with the canopy-forming golden rockweed, <em>Silvetia compressa</em>, to elevated temperature and pCO<sub>2 </sub>conditions reflecting two projected greenhouse emission scenarios [RCP 2.6 (low) & RCP 4.5 (moderate)]. Assemblages were grown in the presence and absence of <em>Silvetia</em>, and in two seasons. Relative to ambient conditions, predicted climate scenarios generally suppressed <em>Silvetia</em> biomass and photosynthetic efficiency. However, these effects varied seasonally - both future scenarios reduced <em>Silvetia</em> biomass in summer, but only the moderate scenario did so in winter. These reductions shifted the assemblage, with more extreme shifts occurring in summer. Contrarily, future scenarios did not shift assemblages within <em>Silvetia </em>Absent treatments, suggesting that climate primarily affected assemblages indirectly through changes in <em>Silvetia</em>. Mesocosm experiments were coupled with a field <em>Silvetia</em>-removal experiment to simulate the effects of climate-mediated <em>Silvetia</em> loss on natural assemblages. Consistent with the mesocosm experiment, <em>Silvetia</em> loss resulted in season-specific assemblage shifts, with weaker effects observed in winter. Together,</span><span> our study supports the hypotheses that climate-mediated changes to canopy-forming species can indirectly affect the associated assemblage, and that these effects vary seasonally. Such seasonality is important to consider as it may provide periods of recovery when conditions are less stressful, especially if we can reduce the severity of future climate scenarios. </span></p>
Season-specific impacts of climate change on canopy-forming seaweed communities
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Data from: Sensitivity and acclimation of three canopy-forming seaweeds to UVB radiation and warming
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Data from: Latitudinal variation in the constitutive and inducible defenses of a canopy-forming rocky intertidal seaweed
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