BACTERIAL LYSIS OF AUREOCOCCUS ANOPHAGEFFERENS CCMP 1784 (PELAGOPHYCEAE)¹

Abstract

Water samples from Great South Bay, New York, contained biological agents capable of causing the lysis of the brown‐tide alga Aureococcus anophagefferens Hargraves et Sieburth. From these water samples, 32 bacterial isolates were tested for algicidal effects against the algae. Six of the isolates were shown to have algicidal effects against A. anophagefferens. Sequencing of the gene 16S rRNA revealed that the isolates were relatively diverse. Based on their similarity to sequences in repositories, the isolates seem to be closely related to Bacillus, Halomonas, Croceibacter atlanticus, Marinobacter, and an Arctic deep‐sea bacterium.

Ubiquitous marine bacterium inhibits diatom cell division

“…RCC 80; moderate inhibition was observed with two distantly related diatoms T. pseudonana and T. oceanica and no inhibition was observed with T. weissflogii (Table 1). Frazier et al (2007) found that the pelagophyte Aureococcus anophagefferens was also inhibited by an isolate of C. atlanticus from Figure 1 Effect of three different C. atlanticus isolates on the growth rates of P. multiseries IOES-1. The growth rates of P. multiseries are indistinguishable from each other when 0.05% v/v of either fresh MB media (n = 2) or an overnight grown culture of Marinobacter sp.…”

Hydrology and Biota Interactions as Driving Forces for Ecosystem Functioning

“…HABs constitute a serious environmental threat to estuarine and coastal ecosystems, and several physical-chemical methods have been proposed to control and mitigate these events (e.g., clay flocculation, Sengco and Anderson, 2004). However, the repercussions of these control strategies still remain a concern (Frazier et al, 2007). Bivalve mollusks, namely native species, have also been…”

“…Both experimental approaches and field studies have shown that phagotrophic protists may be responsible, to some extent, for the dissipation or absence of harmful phytoplankton blooms in inland, estuarine, and coastal areas (Jeong and Shim, 1996;Calbet et al, 2003;Rosetta and McManus, 2003;Gobler et al, 2007;Jeong et al, 2008;Stoecker et al, 2008). Other biologic processes, namely viral-, bacterial-and eukaryotic-induced lyses may also contri bute to the demise of HABs (Hare et al, 2005;Frazier et al, 2007;Montagnes et al, 2008b;Smayda, 2008).…”

“…Benthic grazing may potentially affect phytoplankton and harm ful algae indirectly, by changing the abundance of their predators (e.g., phagotrophic protists, micrometazoans, and mesozoo plankton) or direct competitors (Dupuy et al, 2000;Wong et al, 2003;Cerrato et al, 2004;Maar et al, 2008;Trottet et al, 2008). Other potential biological tools to circumvent and/or remediate HABs involve the use of macrophytes to reduce the concentration of inorganic nutrients (Wolanski, 2007), algicidal bacteria (Frazier et al, 2007), phagotrophic ciliates (Jeong et al, 2008), and specific viruses (Nagasaki et al, 2009).…”

Complete Genome Sequence of Croceibacter Bacteriophage P2559S

“…The highest 16S rRNA gene sequence similarity to other validly published species was only 90.6%, which was recorded for Leeuwenhoekiella palythoae (8). Based on the results of polyphasic taxonomy, this bacterium was established as the type species of the genus Croceibacter in the family Flavobacteriaceae, an abundant marine bacterial group well-known for interaction with phytoplankton (2,4,6). The genome sequence of C. atlanticus HTCC2559 T (10) was shown to encode a protease showing algicidal activity as well as many proteins related to degradation of macromolecules such as alginate (12).…”