Algal responses to dissolved organic carbon loss and pH decline during whole-lake acidification: evidence from paleolimnology

Article Abstract:

Paleolimnology has provided evidence related to algal responses to pH decline and dissolved organic carbon loss in whole-lake acidification. Fossil pigment analyses and 19 year-long historical records were used for quantification of the response to optical and chemical changes after experimental acidification with three different acids. Pigments from green algae went up by a factor of 2 during acidification with sulfuric acid. Those from cryptophytes were not affected and diatoxanthin from diatoms went down. Complex interactions of pH, dissolved organic carbon (DOC) and light may help to explain the high variability found in the responses to acidification.

United States, Canada, Research, Usage, Algae, Environmental aspects, Light, Hydrogen-ion concentration, Marine ecology, Lake ecology, Carbon cycle (Biogeochemistry), Carbon cycle, Water acidification, Acid water pollution, Paleolimnology

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Genetic diversity in Prochlorococcus populations flow cytometrically sorted from the Sargasso Sea and Gulf Stream

Article Abstract:

The genetic diversity of the picophytoplankton Prochlorococcus has been investigated in depth profiles from the Gulf Stream and the Sargasso Sea. Topics include genetic heterogeneity of field populations, a single diverse gene pool shared by populations from the Sargasso Sea and Gulf Stream, alleles shared by subpopulations of flow cytometric multiple populations, and clade members that are high light-adapted and predominate in surface clone libraries.

Atlantic Ocean, Statistical Data Included, Genetic aspects, Natural history, Phytoplankton, Sargasso Sea, Gulf Stream

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