Ultrastructure and Molecular Phylogeny of two Heterolobosean Amoebae, Euplaesiobystra hypersalinica gen. et sp. nov. and Tulamoeba peronaphora gen. et sp. nov., Isolated from an Extremely Hypersaline Habitat

Park, Jong Soo; Simpson, Alastair G. B.; Brown, S.; Cho, Byung Cheol

doi:10.1016/j.protis.2008.10.002

Cited by 59 publications

(136 citation statements)

References 40 publications

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“…A diversity of other heterotrophic protists were isolated from nearly saturated brines (X30% salinity) that could not grow at salinities of o7.5% (Cho et al, 2008;Park et al, 2006;Park et al, 2007Park et al, , 2009). Based on SSU rRNA gene transcripts recovered within our metatranscriptome libraries, the eukaryotic community appears to be dominated by ciliates and dinoflagellates in the UI, and by ciliates and fungi in the LI (Figure 2).…”

Section: Eukaryotic Signaturesmentioning

confidence: 99%

Unveiling microbial activities along the halocline of Thetis, a deep-sea hypersaline anoxic basin

et al. 2014

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Deep-sea hypersaline anoxic basins (DHABs) in the Eastern Mediterranean Sea are considered some of the most hostile environments on Earth. Little is known about the biochemical adaptations of microorganisms living in these habitats. This first metatranscriptome analysis of DHAB samples provides significant insights into shifts in metabolic activities of microorganisms as physicochemical conditions change from deep Mediterranean sea water to brine. The analysis of Thetis DHAB interface indicates that sulfate reduction occurs in both the upper (7.0-16.3% salinity) and lower (21.4-27.6%) halocline, but that expression of dissimilatory sulfate reductase is reduced in the more hypersaline lower halocline. High dark-carbon assimilation rates in the upper interface coincided with high abundance of transcripts for ribulose 1,5-bisphosphate carboxylase affiliated to sulfuroxidizing bacteria. In the lower interface, increased expression of genes associated with methane metabolism and osmoregulation is noted. In addition, in this layer, nitrogenase transcripts affiliated to uncultivated putative methanotrophic archaea were detected, implying nitrogen fixation in this anoxic habitat, and providing evidence of linked carbon, nitrogen and sulfur cycles.

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Section: Eukaryotic Signaturesmentioning

confidence: 99%

Unveiling microbial activities along the halocline of Thetis, a deep-sea hypersaline anoxic basin

et al. 2014

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“…Most heterolobosean cysts have no pores and presumably excyst by a wall rupture as in representatives of Paravahlkampfia (Visvesvara et al, 2009). The cyst of genera Tulamoeba and Monopylocystis has a single pore that penetrates the wall and is sealed with a mucoid plug (Park et al, 2009). Members of genera Willaertia, Naegleria, Marinamoeba, Pernina, and Euplaesiobystra have pores in the cyst wall.…”

Section: Pseudovahlkampfia Emersoni Fumarolamoeba Ceborucoi Willaermentioning

confidence: 99%

“…The cyst pores of Naegleria, Willaertia and Pernina are similar to each other in that the pores penetrate both the endocyst and ectocyst. In contrast, the pores of Euplaesiobystra hypersalinica do not penetrate the endocyst wall (Park et al, 2009). The cyst morphology of the genus Tetramitus, including the presence and number of pores, is highly variable.…”

Section: Pseudovahlkampfia Emersoni Fumarolamoeba Ceborucoi Willaermentioning

confidence: 99%

“…Tulamoeba peronaphora grows in the culture at 75‰ -250‰ salinity, Pharyngomonas kirbyi up to 250‰, Euplaesiobystra hypersalinica and Pleurostomum flabellatum flourish in more than 300‰ salinity. The latter two species are true extremophiles, because they live in nearly salt-saturated solutions (Park et al 2007(Park et al , 2009Park & Simpson, 2011). Some other heteroloboseans have adapted to extremely acidic habitats with pH < 3.…”

Section: Ecology Of Heteroloboseamentioning

confidence: 99%

“…For example, T. thermacidophilus and Oramoeba fumarolia grow in temperature up to 54 o C De Jonckheere et al, 2011a). Marinamoeba thermophila, Fumarolamoeba ceborucoi and Euplaesiobystra hypersalinica grow up to 50 o C , 2011bPark et al, 2009). Several heteroloboseans, importantly including pathogenic Naegleria strains, survive and divide in temperatures around 40 -45 o C (De Jonckheere 2007;Guzmán-Fierros et al, 2008;Park et al, 2007Park et al, , 2009.…”

Section: Ecology Of Heteroloboseamentioning

confidence: 99%

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Diversity of Heterolobosea

Pánek¹,

Čepička²

2012

Genetic Diversity in Microorganisms

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Protozoan Ecology

Anderson

2010

Encyclopedia of Life Sciences

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Protozoan ecology is the interaction in space and time of protozoa (flagellates, amoeboid organisms and ciliates) with other living organisms and the physical environment. It encompasses, among other factors, sources of food and energy used to sustain life, food web dynamics, the role of protozoa in maintaining fertility of ecosystems and adaptive strategies for survival in varying habitats. Among the physical environmental (abiotic) factors, temperature, salinity, nutrients and levels of pollutants, when present, are major sources of influence. A complex set of interactions exists among microbial biota, including the role of nutrient regeneration during protozoan predation on bacteria resulting in release of nutrients due to digestion and disruption of the bacteria during feeding. These nutrients in turn are reutilised by algae during photosynthesis. This process of cyclical nutrient uptake by algae and subsequent release by protozoan predation is known as ‘the microbial loop’. Key Concepts: Characteristics of the physical environment (including temperature, available nutrients and salinity) set the boundary conditions for the abundance and diversity of protozoa within a given habitat. Algae and other photosynthetic organisms are primary producers that fix carbon into organic compounds through photosynthesis and thus provide food sources for all other organisms, including protozoa, within a food web. Heterotrophic (nonphotosynthetic) microorganisms, particularly the protozoa, prey on algae and other microbes, including bacteria, and are consumers within food webs. A complex set of interactions exist in microbial communities, including predator–prey relationships, that determine the flow of matter and energy through the food webs. Competition within and among species partially accounts for the abundance and diversity of species in a microbial community. The stability of microbial communities depends in part on the diversity of species and available resources needed to support life. Protozoa, as predators and also as prey for larger organisms, are often key members of microbial communities and sustain the flow of energy and matter through food webs, including the regeneration of nutrients through their significant role in the microbial loop.

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Ultrastructure and Molecular Phylogeny of two Heterolobosean Amoebae, Euplaesiobystra hypersalinica gen. et sp. nov. and Tulamoeba peronaphora gen. et sp. nov., Isolated from an Extremely Hypersaline Habitat

Cited by 59 publications

References 40 publications

Unveiling microbial activities along the halocline of Thetis, a deep-sea hypersaline anoxic basin

Unveiling microbial activities along the halocline of Thetis, a deep-sea hypersaline anoxic basin

Diversity of Heterolobosea

Protozoan Ecology

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