Proximate composition, photosynthetic and respiratory responses of the seagrass Halophila engelmannii from Florida

Dawes, Clinton J.; Chan, M.; Chinn, Rachel M.; Koch, Evamaría W.; Lazǎr, A.; Tomasko, David A.

doi:10.1016/0304-3770(87)90067-2

Cited by 36 publications

(14 citation statements)

References 3 publications

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“…Experimental studies on seagrass tolerance to salinity changes have shown that most species have optimum productivity at around oceanic salinity (Ogata and Matsui 1965;McMillan and Moseley 1967;Biebl and McRoy 1971;Drysdale and Barbour 1975;Hillman et al 1995;Doering and Chamberlain 1998), though some species have optima at lower salinities (Kamermans et al 1999;van Katwijk et al 1999). These investigations have demonstrated that extreme or suboptimal salinities can produce negative alterations of their photosynthetic rate (Biebl and McRoy 1971;Kerr and Strother 1985;Dawes et al 1987Dawes et al , 1989, metabolism (van Katwijk et al 1999), reproduction (Ramage andSchiel 1998), growth (McMillan andMoseley 1967;Walker 1985;Walker and McComb 1990), and survival (Vermaat et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Effects of salinity and possible interactions with temperature and pH on growth and photosynthesis of Halophila johnsonii Eiseman

2005

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The effects of salinity, temperature, and pH variations on growth, survival, and photosynthetic rates of the seagrass Halophila johnsonii Eiseman were examined. Growth and survival responses to salinity were characterized by aquarium experiments in which plants were exposed to seven different salinity treatments (0, 10, 20, 30, 40, 50, and 60 psu) during 15 days. Photosynthetic behavior was assessed for short-term salinity exposures (1 or 20 h) by incubation experiments in biological oxygen demand (BOD) bottles and by measuring photosynthesis versus irradiance (PI) responses in an oxygen electrode chamber. In the bottle experiments the possible effects of interactions between salinity and temperature (15, 25, and 35°C) or pH (5, 6, 7, and 8.2) were also examined. Growth and survival of H. johnsonii were significantly affected by salinity, with maximum rates obtained at 30 psu. Salinity also altered the parameters of the PI curves. Light-saturated photosynthesis (P max ) and the photosynthetic efficiency at subsaturating light (a) increased significantly up to an optimum of 40 psu, decreasing again at the highest salinities. Dark respiration rates and compensating irradiance (I c ) showed minimum values at 40 and 50 psu, while light-saturation point (I k ) was maximum at 30-50 psu. An interaction between salinity and temperature was not found although an increase of temperature alone produced an increase in a, P max , respiration rates, and I k . An interaction between salinity and pH was only found in the P max response: P max increased with pH=5 at 30 psu. In addition, reducing the pH increased a significantly. In the BOD bottles experiment a significant reduction in the dark respiration with decreasing pH was observed, but the opposite trend was observed in the photosynthetic rate. These results suggest that the endemic seagrass H. johnsonii could be negatively affected by hypo-or hypersalinity conditions, although salinity changes did not seem to alter the tolerance of this species to other environmental factors, such as temperature or pH.

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Section: Introductionmentioning

confidence: 99%

Effects of salinity and possible interactions with temperature and pH on growth and photosynthesis of Halophila johnsonii Eiseman

2005

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“…The high C content of aquatic angiosperms probably results from their relatively high contents of lignin and cellulose (e.g. Hutchinson 1975;Dawes et al 1987) and the high C content of dinoflagellates may be attributable, in turn, to the external cellulose plates present in many of them (Taylor 1987 Nitrogen content (% dry wt ) concentrations of N below the critical concentration for maximum macroalgal growth (N 1.5% dry wt; Fujita et al 1989), although nutrient concentrations in macrophyte tissues may reach values comparable to those observed for phytoplankton (Fig. 2).…”

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confidence: 99%

Nutrient concentration of aquatic plants: Patterns across species

1992

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An extensive compilation of data for 96 phytoplankton species, 46 macroalgal species, 27 seagrass species, 11 species of freshwater angiosperms, and several mixed phytoplankton and macroalgal communities revealed a tendency toward higher concentrations of N and P in phytoplankton compared to those of macrophytes. The depletion of P, and to a lesser extent N, in macrophytes, particularly macroalgae, appears to reflect a greater degree of P and N limitation of growth of natural macrophyte populations, rather than an intrinsic difference in their chemical composition relative to that of phytoplankton. Close associations between nutrients, particularly a strong linear relationship between concentrations of N and P, reflect the similar biochemical basis of the different aquatic plant groups and appear to represent a fundamental characteristic of the plant kingdom. The results obtained indicate, therefore, that aquatic plants form a continuum across a unique pattern of change in nutrient concentrations, despite considerable differences in their architectural, evolutionary, and life histories, and the growth conditions encountered in their habitats.

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“…Variation in sea grass proximate constituents with season results from changes in water quality (light penetration, turbidity, salinity, temperature) that invoke changes in nutrient availability for adding biomass or to counter stresses. 6,7 Therefore, nutrient uptake rates and assimilation by SAV vary, depending on photosynthetic abilities. 6 Shallow-water, subtropical sea grasses undergo a period of winter regression (above-sediment biomass losses) but regain rapid continuous growth during late spring and summer, tapering off in autumn months.…”

Section: Discussionmentioning

confidence: 99%

“…6,7 Therefore, nutrient uptake rates and assimilation by SAV vary, depending on photosynthetic abilities. 6 Shallow-water, subtropical sea grasses undergo a period of winter regression (above-sediment biomass losses) but regain rapid continuous growth during late spring and summer, tapering off in autumn months. 61012 This pattern promotes lower protein in the leaf portions during rapid summer growth, relative to increasing carbohydrate contents.…”

Section: Discussionmentioning

confidence: 99%

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Proximate Nutrient Analyses of Four Species of Submerged Aquatic Vegetation Consumed by Florida Manatee (Trichechus manatus latirostris) Compared to Romaine Lettuce (Lactuca sativa var. longifolia)

Siegal-Willott

Harr²,

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et al. 2010

Journal of Zoo and Wildlife Medicine

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Proximate composition, photosynthetic and respiratory responses of the seagrass Halophila engelmannii from Florida

Cited by 36 publications

References 3 publications

Effects of salinity and possible interactions with temperature and pH on growth and photosynthesis of Halophila johnsonii Eiseman

Effects of salinity and possible interactions with temperature and pH on growth and photosynthesis of Halophila johnsonii Eiseman

Nutrient concentration of aquatic plants: Patterns across species

Proximate Nutrient Analyses of Four Species of Submerged Aquatic Vegetation Consumed by Florida Manatee (Trichechus manatus latirostris) Compared to Romaine Lettuce (Lactuca sativa var. longifolia)

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