Pigment composition during a peridinium bloom in Lake Kinneret (Israel)

Dubinsky, Zvy; Polna, Miriam

doi:10.1007/bf00005750

Cited by 23 publications

(2 citation statements)

References 15 publications

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“…This change in color results from the accumulation of b-carotene and astaxanthin respectively (Zlotnik et al, 1993;Hershkowits et al, 1997). In the case of the dinoflagellate Peridinium gatunense, towards the collapse of its annual bloom in L. Kinneret (Israel), as the nitrogen and phosphorus in the water become depleted, the cells turn increasingly orange, as they accumula- te peridinin (Dubinsky and Polna, 1976;Dubinsky and Berman, 1976), as is seen in Fig. 2.…”

Section: Free Living Phytoplanktonmentioning

confidence: 95%

Uncoupling primary production from population growth in photosynthesizing organisms in aquatic ecosystems

2001

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Whenever actively photosynthesizing cells are exposed to conditions where carbon fluxes exceed intakes of other essential-nutrients required for formation of new biomass, cell division is arrested, and the excess carbon is stored, excreted or directed to secondary functions. The extent of this uncoupling and its' implications in aquatic systems are discussed. We focus on three examples: the cellular level of free living phytoplankton, the ecosystem level in the microbial food web, and the highly specialized level of species interactions in the symbiotic association between zooxanthellae and corals. These examples highlight the adaptive significance of uncoupling between photosynthesis and growth in aquatic systems. Moreover, we underscore the fact that in many real-world situations, net primary productivity cannot be equated to population growth.Roles of the "excess" carbon include photoprotective pigments and buoyancy regulating ballast. The excreted carbon compounds may protect cells or cell masses from desiccation, and fuel the microbial loop. The microbial loop increases overall nutrient extraction efficiency compared to that of which phytoplankton alone are capable.The zooxanthellae-coelenterate symbiosis drives the nutrient and energy fluxes supporting coral reef life in the nutrient-poor tropical seas. In those mutualistic associations, since photosynthesis is normally uncoupled from cell growth, the algae excrete most of their photosynthate and that supports the metabolic activities of the host.

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Section: Free Living Phytoplanktonmentioning

confidence: 95%

Uncoupling primary production from population growth in photosynthesizing organisms in aquatic ecosystems

2001

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“…Absorption by carotenoids is apparently the reason for this spectral feature. During the Peridinium bloom period, peridinin and diadinoxanthin are the most abundant carotenoids (Dubinsky and Polna, 1976). Peridinin absorbs in vivo up to 570 nm (Bidigare et al, 1990) and therefore it reduces reflectance in the green range.…”

Section: Optical Propertiesmentioning

confidence: 99%

Remote sensing of chlorophyll in Lake Kinneret using highspectral-resolution radiometer and Landsat TM: spectral features of reflectance and algorithm development

1995

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Abstract. High-resolution reflectance spectra in the range of 400-850 nm were obtained from Lake Kinneret during a period when dense populations of the dinoflagellate Peridinium gatunense dominated the phytoplankton. Chlorophyll (ChI) concentrations ranged from 5.1 to 185 mg m-3 and from 2.4 to 187.5 mg m-3 in the samples of two independent experiments. The most prominent features of the reflectance spectra were: (i) a wide minimum from 400 to 500 nm; (ii) a maximum at 550-570 nm, which did not surpass 3% in samples with high ChI concentration (>20 mg m-3 ), indicating a strong absorption by pigments in the green range of the spectrum; (iii) a minimum at 676 nm; this was ~ 1 % and was almost insensitive to variation in ChI concentration >10 mg m-3 ; (iv) a maximum reflectance showed near 700 nm; its magnitude and position were highly dependent on chlorophyll concentration. Highspectral-resolution data were used as a guideline for selection of the most suitable spectral bands for chlorophyll remote sensing. Models were devised, based on the calculation of the integrated area above the baseline from 670 to 850 nm and the reflectance maximal height within this range. Some algorithms already used in previous studies were tested and showed a plausible degree of accuracy when applied to the current data base. However, novel models devised in this study improved substantially the accuracy of ChI estimation by remotely sensed data, by reducing the estimation error from >11 to 6.5 mg m-3 • Those models were validated by an independent data set where ChI concentration ranged over two orders of magnitude. The use of three relatively narrow spectral bands was sufficient for ChI mapping in Lake Kinneret. Therefore, a relatively simple sensor, measuring only a few bands will be employed in future applications for ChI monitoring in inland waters. Radiometric data were also used to simulate radiances in the channels of TM Landsat and to find the algorithm for ChI assessment. The ratio of channel 4 to channel 3 was used and enabled ChI estimation with an error of <15 mg m-3 • This algorithm was employed to map ChI in the entire area of Lake Kinneret with 10 gradations.

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Light Utilization Efficiency in Natural Phytoplankton Communities

Dubinsky

1980

Primary Productivity in the Sea

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Pigment composition during a peridinium bloom in Lake Kinneret (Israel)

Cited by 23 publications

References 15 publications

Uncoupling primary production from population growth in photosynthesizing organisms in aquatic ecosystems

Uncoupling primary production from population growth in photosynthesizing organisms in aquatic ecosystems

Remote sensing of chlorophyll in Lake Kinneret using highspectral-resolution radiometer and Landsat TM: spectral features of reflectance and algorithm development

Light Utilization Efficiency in Natural Phytoplankton Communities

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