Bacterial response to blooms dominated by diatoms and Emiliania huxleyi in nutrient-enriched mesocosms

Abstract The bacterial response to two algal blooms dominated by the marine coccolithophorid Emiliania huxleyi and the marine diatoms Skeletonema costatum and Leptocylindricus danicus in nutrient-enriched mesocosms was observed. Bacterial abundance was determined using epifluorescent microscopy and bacterial activity using 3 H-thymidine and 3 H-leucine incorporation. There were significant differences in the bacterial response to the two blooms with the maxima in bacterial activity associated with the E. huxleyi bloom occurring almost synchronously with the maxima in E. huxleyi abundance and the maxima in bacterial activity associated with the diatom bloom occurring about 1 week after the maxima in diatom abundance. It is suggested that this results from the greater tendency of E. huxleyi to release simple monomeric organic compounds compared to S. costatum . Levels of bacterial 3 H-leucine incorporation relative to bacterial 3 H-thymidine incorporation were significantly higher in the diatom dominated bloom compared to the E. huxleyi dominated bloom. It is suggested that this is associated with the large scale exudation of complex polypeptides by S. costatum . In both enclosures bacterial 3 H-thymidine incorporation peaked rapidly relative to bacterial 3 H-leucine incorporation implying a bacterial demand for inorganic nitrogen at the peak of bacterial activity. Consequently, at the peak of the E. huxleyi bloom algae may have been competing with bacteria for inorganic nitrogen, whereas during the diatom dominated bloom this competition probably did not occur until the diatom bloom had begun to subside. Following the collapse of both blooms the bacterial community regained its pre-bloom status as a small source of ammonium.

• Publication year

  1998

• Venue

  Oceanographic Literature Review

• Publication date

  1998-02-01

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.1006/ECSS.1998.0329
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

• No references are available for this paper.

• Nano- and microphytoplankton community characteristics in brown tide bloom-prone waters of the Qinhuangdao coast, Bohai Sea, China

  2017cites this paper
• Ocean acidification and marine biogenic trace gas production

  2010cites this paper
• Microbial dynamics in autotrophic and heterotrophic seawater mesocosms. II. Bacterioplankton community structure and hydrolytic enzyme activities

  2007cites this paper
• A review of the causes, effects, and potential management of harmful brown tide blooms caused byAureococcus anophagefferens (Hargraves et sieburth)

  2005cites this paper
• The Effect of Depth on the Accrual of Marine Biofilms on Glass Substrata Deployed in the Clyde Sea, Scotland

  2004cites this paper
• In situ feeding physiology and grazing impact of the appendicularian community in temperate waters

  2003cites this paper
• Stability of bacterial and viral community compositions in Danish coastal waters as depicted by DNA fingerprinting techniques

  2002cites this paper
• Scales and processes in the aggregation of diatom blooms: high time resolution and wide size range records in a mesocosm study

  2002cites this paper
• Seasonal variation of dissolved organic carbon (DOC) and nitrogen (DON) in relation to primary production and yellow substrates (g440). in the Menai Strait, North Wales

  2002cites this paper
• A stoichiometric model relating growth substrate quality (C:N:P ratios) to N:P ratios in the products of heterotrophic release and excretion

  2001cites this paper
• Size-fractionated primary production and nitrogen uptake during a North Atlantic phytoplankton bloom : implications for carbon export estimates

  2001cites this paper
• Effects of organic carbon, organic nitrogen, inorganic nutrients, and iron additions on the growth of phytoplankton and bacteria during a brown tide bloom

  2001cites this paper