Specific Leaf Areas and Zonation of Freshwater Macrophytes

Spence, D. H. N.; Campbell, Rob; Chrystal, Jean

doi:10.2307/2259028

Cited by 46 publications

(20 citation statements)

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“…As was pointed out in the introduction, foliar polymorphism has been observed in aquatic angiosperms such as Halodule (den Hartog, 1970) Potamogeton (Spence et al, 1973), Halophila (Lipkin, 1979) Zostera noltii (Nienhuis, personal communication), Zostera muelleri (Strother, personal communication) as well as in seaweeds (Duncan & Foreman, 1980;Lapointe et al, 1981;. Duncan & Foreman (1980) found that stipe elongation in Nevocystis could be controlled by the phytochrome system.…”

Section: Discussionmentioning

confidence: 91%

Temperature and emergence effects on the net photosynthesis of two Zostera noltii Hornem. morphotypes

Pérez‐Lloréns

Niell

1993

Hydrobiologia

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Apparent photosynthetic rates (APS) of two Zostera noltii Hornem. morphotypes were measured in air and in water at different temperatures with a closed infra-red gas analysis system (IRGA).Hyperbolic functions accurately described the photosynthesis-CO, relationships when the leaves were exposed to air. The photosynthetic behaviour in water, on the contrary, could not be described by Michaelis type kinetics, due to the existence of a rapid transition from the initial slope to the saturation phase. Both morphotypes (narrow-leaved, NLM and large-leaved, LLM) showed higher APS rates in water than in air, although the highest APS rates, in air as well in water, were recorded for the NLM.Temperature had a significant influence on the photosynthetic parameters: APS,,, (maximum photosynthetic rate) decreased (in air and in water) with increased temperature in both morphotypes; compensation points (CP) in air increased at high temperature, especially in the LLM. NLM specimens showed enhanced affinity (lower Km) with increasing temperature in air. On the contrary, Km values in water were not significantly affected by temperature.The results suggest that NLM specimens are better adapted than the LLM to occur exposed to air. The distributional pattern of the two morphotypes in the Palmones Estuary is discussed on the basis of their photosynthetic behaviour.

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Section: Discussionmentioning

confidence: 91%

Temperature and emergence effects on the net photosynthesis of two Zostera noltii Hornem. morphotypes

Pérez‐Lloréns

Niell

1993

Hydrobiologia

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“…The relatively high water attenuation coefficient (2-6.5 m -1 , Vergara et al 1997) causes a strong decrease in the irradiance reaching the plants in the lower intertidal and subtidal sites. An increase in leaf length (or width) has been pointed out as a morphological adaptation to low irradiances, allowing a position higher up in the canopy (Spence et al 1973). Another common adaptation to increasing depth is the enhancement of photosynthetic pigments (Falkowski and Raven 1997).…”

Section: Discussionmentioning

confidence: 99%

Morphological and physiological differences between two morphotypes of Zostera noltii Hornem. from the south-western Iberian Peninsula

Peralta¹,

Pérez‐Lloréns²,

Hernández³

et al. 2000

Helgoland Marine Research

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The morphological and physiological differences between two morphotypes of Z. noltii Hornem. were studied in the intertidal meadows on the southwestern Iberian Peninsula (Palmones river estuary and Ria Formosa). A small-leaved morphotype (SM) grows mainly at high intertidal sites, meadow edges or in recently deposited sandbanks, whereas a large-leaved morphotype (LM) generally thrives in well-structured beds or in deeper places. This study deals with the morphological, biochemical and physiological differences between these morphotypes as well as the ecological implications of the occurrence of different morphotypes in the same meadow. Shoot length, leaf width, rhizome internode length, roots per node, root length, leaf nutrient and pigment contents, and photosynthetic rates of both morphotypes were compared. The below-ground architecture (root and rhizome complex) of both morphotypes was more developed in sites characterized by higher hydrodynamics and/or a lower nitrogen content in sediments. Both morphotypes showed similar values for photosynthetic efficiency, dark respiration rate and compensation irradiance. On the other hand, the net photosynthetic capacity was much greater (5-fold) for the SM. This difference could explain the greater growth rate and faster leaf turnover rate of the SM compared with the LM. The occurrence of the SM in newly settled areas (and in the meadow edges) could be explained on the basis of its higher growth rate, which would allow a faster spreading of the meadow and/or better recovery after burial resulting from stormy weathers.

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“…Moreover, light absorptance was always high (> 90%) leading to similar light absorption per unit leaf biomass and accordingly, photosynthetic light use efficiency was almost the same for the 2 species. More prominent changes in photosynthetic rates with depth have, however, been found in fast-growing freshwater macrophytes (Spence et al 1973, Goldsborough & Kemp 1988, Maberly 1993, which may be more metabolically plastic due to thinner leaves and more flexible leaf morphology.…”

Section: Morphological and Physiological Flexibilitymentioning

confidence: 99%

Depth-acclimation of photosynthesis, morphology and demography of Posidonia oceanica and Cymodocea nodosa in the Spanish Mediterranean Sea

Olesen¹,

Enríquez²,

Duarte³

et al. 2002

Mar. Ecol. Prog. Ser.

156

131

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Depth-related changes in population structure, biomass partitioning and photosynthesis were studied in populations of Cymodocea nodosa and Posidonia oceanica on the NE Spanish coast. The population structure of both species changed much more with depth than leaf morphology and physiology. Leaf biomass declined 5-to 7-fold along the depth gradient reducing self-shading within the canopy, whereas the leaf area per unit leaf biomass and the photosynthesis-light response varied less than 1.5-fold among depths. Moreover, C. nodosa developed a greater proportion of leaves relative to rhizomes and roots at greater depths, thereby promoting the balance between photosynthesis and respiration in the shoots. C. nodosa, being a potentially fast-growing species compared to P. oceanica, had higher maximum photosynthetic and respiration rates as well as light compensation points for photosynthesis. Photosynthetic efficiency at low light, however, was almost the same for the 2 species as suggested by the relatively small differences in mass-specific light absorption. Only C. nodosa acclimated physiologically to depth as light-use efficiency increased, and light compensation point declined significantly from shallow to deep water. P. oceanica, however, possessed low respiration rates and slightly lower light compensation points values than C. nodosa throughout the depth range. Shoot mortality and recruitment rates were unaffected by rooting depth. C. nodosa stand experienced fast shoot turnover compared to P. oceanica, and shoot longevity of the former species decreased significantly with depth, suggesting higher risk of patch mortality at the depth limit. In contrast, P. oceanica shoot longevity was highest at great depths. Overall, these species differences in leaf metabolism and shoot dynamics suggest that C. nodosa responds faster to changing light conditions, whereas P. oceanica is able to survive longer at low irradiance due to low growth and respiratory maintenance rates.

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Specific Leaf Areas and Zonation of Freshwater Macrophytes

Cited by 46 publications

References 10 publications

Temperature and emergence effects on the net photosynthesis of two Zostera noltii Hornem. morphotypes

Temperature and emergence effects on the net photosynthesis of two Zostera noltii Hornem. morphotypes

Morphological and physiological differences between two morphotypes of Zostera noltii Hornem. from the south-western Iberian Peninsula

Depth-acclimation of photosynthesis, morphology and demography of Posidonia oceanica and Cymodocea nodosa in the Spanish Mediterranean Sea

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