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Title

Seasonal and age-dependent variability of Posidonia oceanica (L.) Delile photosynthetic parameters

AuthorsAlcoverro, Teresa ; Manzanera, Marta; Romero, Javier
KeywordsIc
Seagrass
Pmax
Irradiance
Ik
Issue Date1998
PublisherElsevier
CitationJournal of Experimental Marine Biology and Ecology 230 : 1-13 (1998)
AbstractThe photosynthesis versus irradiance behavior and the dark respiration of the dominant Mediterranean seagrass Posidonia oceanica were investigated to assess the influence of tissue age (in the range 0–150 days), and seasonality on the seagrass photosynthetic performances. Parameters of the P–I curves were, yearly averaged and for the whole shoot, 7.7 mgO2 g−1DW h−1 (net oxygen release at saturating irradiance, Pmax), 257 μmol quanta m−2 s−1 (saturating irradiance, Ik), 37 μmol quanta m−2 s−1 (compensating irradiance, Ic) and 1.2 mgO2 g−1DW h−1 (dark respiration, R). Ik and Ic showed distinct seasonality, being in general higher in summer than in winter, and showed modest to null dependence on tissue age. In contrast, Pmax and R did not show significant seasonal changes, but were dependent on tissue age, as was also the Pmax:R ratio. Pmax was substantially lower for the oldest age classes than for the youngest ones, and this decline with age can be a result of nitrogen retranslocation, as indicated by the within-months (and across ages) positive correlation between nitrogen concentration in leaves and Pmax. The high within-shoot heterogeneity in photosynthetic performances has serious methodological implications, and should be taken into account when assessing photosynthesis from small leaf sections.
DescriptionEste artículo contiene 13 páginas, 4 tablas, 4 figuras.
URIhttp://hdl.handle.net/10261/150041
ISSN0022-0981
Appears in Collections:(CEAB) Artículos
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