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Cawley KM, Koerfer V, McKnight DM. The role of dissolved organic matter (DOM) quality in the growth enhancement of Alexandrium fundyense (Dinophyceae) in laboratory culture(1). J Phycol. 2013;49(3):546-54doi: 10.1111/jpy.12063.
Cawley, K. M., Koerfer, V., & McKnight, D. M. (2013). The role of dissolved organic matter (DOM) quality in the growth enhancement of Alexandrium fundyense (Dinophyceae) in laboratory culture(1). Journal of phycology, 49(3), 546-54. https://doi.org/10.1111/jpy.12063
Cawley, Kaelin M, et al. "The role of dissolved organic matter (DOM) quality in the growth enhancement of Alexandrium fundyense (Dinophyceae) in laboratory culture(1)." Journal of phycology vol. 49,3 (2013): 546-54. doi: https://doi.org/10.1111/jpy.12063
Cawley KM, Koerfer V, McKnight DM. The role of dissolved organic matter (DOM) quality in the growth enhancement of Alexandrium fundyense (Dinophyceae) in laboratory culture(1). J Phycol. 2013 Jun;49(3):546-54. doi: 10.1111/jpy.12063. Epub 2013 Apr 08. PMID: 27007043.
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J Phycol. 2013 Jun;49(3):546-54. doi: 10.1111/jpy.12063. Epub 2013 Apr 08.

The role of dissolved organic matter (DOM) quality in the growth enhancement of Alexandrium fundyense (Dinophyceae) in laboratory culture(1).

Journal of phycology

Kaelin M Cawley, Verena Koerfer, Diane M McKnight

Affiliations

  1. Institute for Arctic and Alpine Research (INSTAAR), University of Colorado at Boulder, Boulder, Colorado, 80303, USA.

PMID: 27007043 DOI: 10.1111/jpy.12063

Abstract

Several algal species responsible for harmful algal blooms (HABs), such as Alexandrium fundyense, are mixotrophic under certain environmental conditions. The ability to switch between photosynthetic and heterotrophic modes of growth may play a role in the development of HABs in coastal regions. We examined the influence of humic dissolved organic matter (HDOM) derived from terrestrial (plant/soil) and microbial sources on the growth of A. fundyense. We found that a terrestrially derived HDOM, Suwannee River humic acid (SRHA), did enhance A. fundyense growth; however, a microbially derived HDOM, Pony Lake fulvic acid (PLFA) did not enhance growth. A. fundyense grows in association with bacteria in culture and we observed that bacterial cell densities were much lower in A. fundyense cultures than in bacteria-only cultures, consistent with bacterial grazing by A. fundyense in culture. In bacteria-only cultures with added algal exudates (EX), the addition of PLFA and SRHA resulted in a slight increase in bacterial cell density compared to cultures without HDOM added. Changes over time in the chemical quality of the HDOM in the A. fundyense cultures reflected contributions of microbially derived material with similar characteristics as the PLFA. Overall, these results suggest that the chemical differences between SRHA and PLFA are responsible for the greater effect of SRHA on A. fundyense growth, and that the differential effect is not a result of an effect on the growth of associated bacteria.

© 2013 Phycological Society of America.

Keywords: Alexandrium; Humic, fluorescence; PARAFAC; Red tide; dissolved organic matter

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