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- W2126410367 abstract "We explored the role of light-saturated (carbon-limited) photosynthesis on δ13C of turtlegrass (Thalassia testudinum Banks ex Kö;nig) populations from the clear, blue waters of the Great Bahama Bank and the turbid, green waters of Florida Bay using field observations and radiative transfer models. Consistent with numerous previous observations, leaf δ13C decreased significantly with water depth in both regions. However the δ13C for Bahamas turtlegrass was 3‰ heavier than that for Florida Bay turtlegrass at equivalent depths, and broadband irradiance explained even less of the δ13C variations than depth. Instead, leaf δ13C showed a stronger relationship to the fraction of the day that photosynthesis of the intact plant canopy was carbon-limited. When the Bahamas and Florida Bay δ13C values were related to the fraction of the day that photosynthesis was carbon-limited, the variations in leaf δ13C observed for Florida and Bahamas populations collapsed into a single relationship that explained 65% of the variation in leaf δ13C. Consequently, turtlegrass from the Bahamas was isotopically heavier than Florida Bay populations growing at equivalent depths because they were more carbon-limited ( = light-saturated) for a larger fraction of the day. The ability to predict turtlegrass δ13C from the daily period of carbon-limited photosynthesis provides a mechanistic link to fundamental relationships between light and photosynthesis that can transcend geographic differences in depth and water-column optical properties, and may permit leaf δ13C to provide a robust indicator of recent photosynthetic performance and plant survival in response to changing environmental conditions." @default.
- W2126410367 created "2016-06-24" @default.
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- W2126410367 date "2012-03-01" @default.
- W2126410367 modified "2023-10-16" @default.
- W2126410367 title "<i>δ</i> <sup>13</sup> C is a signature of light availability and photosynthesis in seagrass" @default.
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- W2126410367 doi "https://doi.org/10.4319/lo.2012.57.2.0441" @default.
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