Dense Mat-forming Bacterium Thioploca ingrica (Beggiatoaceae) in Eastern Lake Ontario: Implications to the Benthic Food Web

Dermott, R.; Legner, M.

doi:10.1016/s0380-1330(02)70614-x

Cited by 17 publications

(25 citation statements)

References 42 publications

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“…Morphologically, T. ingrica was defined as a Thioploca species having a trichome 2.0-4.5 mm in diameter (Wislouch, 1912;Maier, 1984). Organisms that fit this description have been found in freshwater and brackish sediments of various localities, and the placement of these organisms in the same species has been generally supported by their 16S rRNA gene sequences (Maier and Murray, 1965;Nishino et al, 1998;Zemskaya et al, 2001Zemskaya et al, , 2009Dermott and Legner, 2002;Kojima et al, 2003Kojima et al, , 2006Høgslund et al, 2010;Nemoto et al, 2011Nemoto et al, , 2012Salman et al, 2011). Nitrate accumulation by T. ingrica was reported in previous studies, although the intracellular concentrations were much lower than in relatives with large vacuoles (Zemskaya et al, 2001;Kojima et al, 2007;Høgslund et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Ecophysiology of Thioploca ingrica as revealed by the complete genome sequence supplemented with proteomic evidence

et al. 2014

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Large sulfur-oxidizing bacteria, which accumulate a high concentration of nitrate, are important constituents of aquatic sediment ecosystems. No representative of this group has been isolated in pure culture, and only fragmented draft genome sequences are available for these microorganisms. In this study, we successfully reconstituted the genome of Thioploca ingrica from metagenomic sequences, thereby generating the first complete genome sequence from this group. The Thioploca samples for the metagenomic analysis were obtained from a freshwater lake in Japan. A PCR-free paired-end library was constructed from the DNA extracted from the samples and was sequenced on the Illumina MiSeq platform. By closing gaps within and between the scaffolds, we obtained a circular chromosome and a plasmid-like element. The reconstituted chromosome was 4.8 Mbp in length with a 41.2% GC content. A sulfur oxidation pathway identical to that suggested for the closest relatives of Thioploca was deduced from the reconstituted genome. A full set of genes required for respiratory nitrate reduction to dinitrogen gas was also identified. We further performed a proteomic analysis of the Thioploca sample and detected many enzymes/proteins involved in sulfur oxidation, nitrate respiration and inorganic carbon fixation as major components of the protein extracts from the sample, suggesting that these metabolic activities are strongly associated with the physiology of T. ingrica in lake sediment.

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Section: Introductionmentioning

confidence: 99%

Ecophysiology of Thioploca ingrica as revealed by the complete genome sequence supplemented with proteomic evidence

et al. 2014

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“…of the amount that occurred naturally in these sediments (Table 3; Dermott and Legner, 2002). The amount of Thioploca decreased in jars with added Diporeia over 60 d (Figure 3), indicating the filamentous bacteria was consumed or destroyed by the amphipods.…”

Section: Bacterial Assaysmentioning

confidence: 95%

“…The toxicant microcystin present could be transferred offshore to Diporeia via deposited pseudofaeces. In addition, mats of the filamentous sulphur bacteria Thioploca ingrica (Beggiatoaceae) became common in parts of eastern Lake Ontario after Diporeia disappeared (Dermott and Legner, 2002). Thioploca form Downloaded by [University of Connecticut] at 08:05 10 October 2014 droplets of sulphur by reacting H 2 S in the sediment with NO 3 from the water; thus, the presence of Thioploca could make the sediments a less favourable medium for Diporeia.…”

Section: Introductionmentioning

confidence: 99%

Is sediment or pseudofaeces toxicity responsible for the decline of the amphipod Diporeia hoyi in Lakes Erie and Ontario?

Dermott

Munawar

Carou

et al. 2005

Aquatic Ecosystem Health &Amp; Management

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The deepwater amphipod Diporeia hoyi has disappeared from Lake Erie and much of Lake Ontario at depths <80 m. This amphipod had supplied 20 percent of the fisheries energy budget in the Great Lakes. The exotic mussel Dreissena bugensis now forms most of the benthic biomass above 60 m depth, but Diporeia is absent over large areas where Dreissena are rare. The filamentous bacterium Thioploca ingrica is now common at many sites between 30 and 40 m where Diporeia has disappeared. Fisheries and Oceans, Canada, investigated the causes of the decline by examining the sediment chemistry, bacterial production and conducted sediment bioassays using Diporeia, Hyalella and Microtox R . Microtox R showed no evidence of toxicity in sediments now devoid of Diporeia. Amphipod survival and growth was greatest in sediment that rapidly lost its Diporeia population in 1993. Presence of Thioploca had no effect on Diporeia survival. Hyalella was more sensitive than Diporeia to test sediments and to filtered water from mussel cultures. Sediment from sites with dense Dreissena populations had lower Diporeia survival. A diet of mussel pseudofaeces caused significantly lower survival in both Hyalella and Diporeia. The exact mechanism causing lower survival is currently unknown and may be related to a nutritional problem or associated waste metabolites.

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“…Dreissena may have been responsible for the extirpation of the dominant Diporeia from eastern Lake Ontario. These changes that were related directly or indirectly to Dreissena had cascading effects on the plankton (Nicholls, 2001), fish community (Hoyle at al., 2008), and sediment bacteria (Dermott and Legner, 2002). After 2001, the benthic community biomass adjusted to the progressive oligotrophication of the lower bay and another shift in fish community as Round Goby increased.…”

Section: Post-gobymentioning

confidence: 99%

Changes in the benthic community of the Bay of Quinte, Lake Ontario, over a 40 year period

Dermott

Martchenko

Johnson

2012

Aquatic Ecosystem Health &Amp; Management

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The benthic community structure in the Bay of Quinte, eastern Lake Ontario, was examined over a 40 year period (1967-2006). Changes in species composition were examined using clustering and ordination analysis at a shallow upper bay site (6 m) and in the deeper lower bay site (32 m). Tubificidae and Chironomidae, which dominated the upper bay, responded to phosphorus reductions between 1978 and 1991 with increased diversity, and a return of pollution sensitive species. This response accelerated in 1993, after the arrival of Dreissena. Epibenthic Amphipoda, Gastropoda and Sphaeriidae increased in the upper bay between 1986-1999, but decreased following the arrival of the Round Goby (Apollonia melanostomus). The lower bay underwent a major change after 1994, when Quagga Mussel replaced the amphipod Diporeia as the dominant organism. Since 1990, non-dreissenid biomass decreased in the lower bay but has not significantly changed in the upper bay. Ordination showed that the community in the upper bay changed over time, and remained different from the lower bay community. In the lower bay and Lake Ontario, the benthic community greatly changed to one very different from the historical community of the Great Lakes.

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Dense Mat-forming Bacterium Thioploca ingrica (Beggiatoaceae) in Eastern Lake Ontario: Implications to the Benthic Food Web

Cited by 17 publications

References 42 publications

Ecophysiology of Thioploca ingrica as revealed by the complete genome sequence supplemented with proteomic evidence

Ecophysiology of Thioploca ingrica as revealed by the complete genome sequence supplemented with proteomic evidence

Is sediment or pseudofaeces toxicity responsible for the decline of the amphipod Diporeia hoyi in Lakes Erie and Ontario?

Changes in the benthic community of the Bay of Quinte, Lake Ontario, over a 40 year period

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