每年出版 4 期
ISSN 打印: 1521-9429
ISSN 在线: 1940-4328
Indexed in
Spatial and temporal response of scytonemin and photosynthetic pigments in calcareous algal mats from Southern Florida (USA)
摘要
This study examines the spatial and temporal variability of 6 pigments (scytonemin, β-carotene, chl. a, phycoerythrin, phyocyanin, and allophycocyanin) within calcareous cyanobacterial mats from South Florida, USA. The total pigment concentrations within the cyanobacterial mats varied spatially with deth through the mat. β-carotene, chl. a, and allophycocyanin concentrations increased significantly with mat depth. The cyanobacterial mats upper layer (0.3 cm) had a 5.57-fold increase and the middle layer (0.6 cm) had a 4.24-fold increase from 0700 to 1200 hrs, while the largest increase was in the lower layer (1 cm) a 7.23-fold increase from 1000 to 1300 hrs. The community total pigment concentration from 0800 hrs and peaked at 1300 hrs varying from 7.61 mg·cm−3 to 21.06 mg·cm−3, a 2.77-fold increase, then decreasing at 1345 hrs. Scytonemin, which shields algae from UV-radiation, was abundant throughout the mats. β-carotene, scytonemin, and chl. a contributed over 97% of the total pigment concentration. All pigment concentrations increased with time of sampling, some as much as 3-fold, from 0800 to 1300 hrs and then declined. This may represent a diurnal cycle of resource allocation to optimize light harvesting and cell growth, which has implications for timing of sampling and estimating biomass with pigment concentration.
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Hagerthey Scot E., Bellinger Brent J., Wheeler Kristin, Gantar Miroslav, Gaiser Evelyn, Everglades Periphyton: A Biogeochemical Perspective, Critical Reviews in Environmental Science and Technology, 41, sup1, 2011. Crossref