Data/hora: 08/06/2024 09:36:10

Provedor de dados: | 13
País: | Ukraine

Título:

Light absorbtion and maximum yield of photosynthesis during autumn phytoplankton bloom in the western Black Sea.

Поглощение света и максимальный квантовый выход фотосинтеза в период осеннего цветения фитопланктона в Чёрном  море.

Поглинання світла і максимальний квантовий вихід фотосинтезу в період осіннього цвітіння фiтопланктону в Чорному морі.

Autores: | Churilova, T. Ya.; Finenko, Z. Z.; Turgul, S.
Data: | 2009-03-30
Ano: | 2008
Palavras-chave: | Chlorophyll a; Phytoplankton; Light absorption; Maximum quantum yield; Nutrients; Хлорофилл a; Фитопланктон; Поглощение света; Максимальный квантовый выход; Биогенные элементы; Хлорофіл а; Фітопланктон; Поглинання світла; Максимальний квантовий вихід; Біогенні елементи.
Resumo: | In the frame of GEF/UNDP Black Sea Ecosystem Recovery Project the effect of nutrient availability on phytoplankton light absorption and maximum quantum yield of carbon fixation (фmax) has been investigated. It has been found out that chlorophyll a concentration (Chl a) varied from 0.3 to 10 mg m-3 increasing from deep-water region to shelf waters. At the shallow stations, where upper mixed layer spread deeper the bottom of euphotic zone, the homogenous pigment distribution was observed. In the deep-water region the Chl a profiles showed the presence of a deep Chl a maximum (DCM) below a seasonal density cline. The functional characteristics of phytoplankton showed depth-dependent variation. The phytoplankton from DCM was characterized 20 % lower values of spectral averaged Chl-a – specific light absorption  ᾱph (0.016±0.0025 m2 (mgChl)-1) and more than in two times higher values of фmax (0.070±0.012 molC (mol quanta)-1) compared with the surface phytoplankton  ᾱph(0.021±0.0035 m2 (mgChl)-1) and фmax  (0.030±0.0078 molC (mol quanta)-1). From offshore to shallow stations the increasing of surface Chl a concentration was accompanied with slight decrease of  ᾱph(on ~20 %) and significant increase of фmax up to its theoretical limit - 0.1 molC (mol quanta)-1, which were caused by an increase in nutrient supply across the shelf.
Tipo: | Journal Contribution
Idioma: | Inglês

Identificador:

Morskyji ekhologichnyji zhurnal/Marine ecological journal/Morskoj ekhologicheskij zhurnal, 7(3). p. 75-86

1684-1557

http://repository.ibss.org.ua/dspace/handle/99011/823

Formato:

195072 bytes

application/msword