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Sci Rep ; 9(1): 14657, 2019 10 10.
Artículo en Inglés | MEDLINE | ID: mdl-31601973

RESUMEN

Analyses of the integrated seagrass response to depth support the previously documented low plasticity and consistent shade-adapted leaf physiology of a habitat-builder that dominates well-illuminated reef environments. Two structural responses, "canopy-opening" and "below-ground-mass-depletion", govern the photoacclimatory response and facilitate, respectively, light penetration within the canopy and functional adjustments in whole-plant carbon balances. Conversely, "canopy-closing" may also explain dense canopies formed close to the waterline, as they provide shade and photoprotection to a susceptible leaf physiology under high-light. Canopy light attenuation is primarily regulated by the leaf area index (LAI), which is governed by changes in shoot size and density. Shoot density diminishes non-linearly with depth, while shoot size increases to a maximum followed by a decline. The initial increase in shoot size, which resembles a self-thinning response, increases LAI and meadow production in shallow depths. These seagrass structural adjustments have relevant ecological implications. Canopy-thinning allows macrophyte diversity to increase with depth, while seagrass production and carbon storage diminish exponentially, and are maximal only in a shallow coastal fringe. The results support the universality of plant self-thinning, from phytoplankton to complex canopies, likely the consequence of simple physical laws related to light limitation and pigment self-shading within photosynthetic structures and communities.


Asunto(s)
Aclimatación , Organismos Acuáticos/fisiología , Ciclo del Carbono/fisiología , Poaceae/fisiología , Agua de Mar/química , Carbono/metabolismo , Ciclo del Carbono/efectos de la radiación , Ecosistema , Luz , Hojas de la Planta/crecimiento & desarrollo , Hojas de la Planta/metabolismo , Brotes de la Planta/crecimiento & desarrollo , Brotes de la Planta/metabolismo
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