A unique thermal aquatic environment: A microbial characterization

Greenwood, John; Steenbergen, James F.

doi:10.1007/bf00005753

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…One strain of N . muscorum may survive at 60 k 5" C in hot springs (Greenwood and Steenbergen 1976) (survival of Nostoc at such high temperatures has not been confirmed by any other researchers; R. W. Castenholz, pers. commun.…”

Section: Physiological Ecologymentioning

confidence: 93%

“…It is likely that distribution maps of other species also would show a correlation between collection sites and research universities. Nostoc muscorum may occur in hot springs (Greenwood and Steenbergen 1976), and N. prunijiome grows in water that is constantly 4" C (Dodds and Castenholz 1987). Nostoc has been reported in many lentic habitats including (but not limited to) the benthos of ultra-oligotrophic lakes (Reuter et al 1983), swimming pools (Adamson and Sommerfeld 1978), high-altitude Kenyan lakes (e.g.…”

Section: Distributionmentioning

confidence: 99%

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THE ECOLOGY OFNOSTOC

Dodds

Gudder

Mollenhauer³

1995

Journal of Phycology

311

242

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Nostoc is a genus of filamentous cyanobacteria that can form macroscopic or microscopic colonies and is common in both terrestrial and aquatic habitats. Much of the success of Nostoc in terrestrial habitats is related to its ability to remain desiccated for months or years and fully recover metabolic activity within hours to days after re‐hydration with liquid water. Nostoc can also withstand repeated cycles of freezing and thawing and, thus, is an important component of extreme terrestrial habitats in the Arctic and Antarctic. The ability to fix atmospheric N2can provide an advantage in nitrogen‐poor environments. Nostoc also has the ability to screen damaging ultraviolet light in terrestrial and shallow benthic habitats. The genus potentially could be important in paddy rice culture because it fixes nitrogen that may later be released and used by plants; it also may play a role in soil formation and may increase nitrogen input to natural aquatic and terrestrial ecosystems. The abilities to survive in terrestrial habitats and fix N2are important in symbiotic interactions with fungi (lichens), liverworts, hornworts, mosses, ferns, cycads, and the angiosperm Gunnera. Nostoc is somewhat resistant to predation; this probably is related to production of large amounts of sheath material, synthesis of microcystin‐like toxins by some strains, and formation of colonies that are too large for many algivores to consume. Some organisms can subsist on Nostoc, although it may not be a preferred food source. Lytic cyanophages also infect Nostoc, but little is known about population control of Nostoc in its natural environment, Late Precambrian fossils resembling Nostoc have been described, and Nostoc possibly has been an important component of many terrestrial and aquatic communities since that time.

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Section: Physiological Ecologymentioning

confidence: 93%

Section: Distributionmentioning

confidence: 99%

THE ECOLOGY OFNOSTOC

Dodds

Gudder

Mollenhauer³

1995

Journal of Phycology

311

242

View full text Add to dashboard Cite

show abstract

“…Some species of Nostoc are able to endure extreme environmental temperatures (Dodds et al, 1995). One strain of N. muscorum can survive at 60 + 58C in hot springs (Greenwood & Steenbergen, 1976). Many species of Nostoc are the predominant biota in cold polar environments such as ice shelves, glaciers and ice-capped lakes (Vicent, 2000).…”

mentioning

confidence: 99%

Photosynthetic physiology and growth as a function of colony size in the cyanobacteriumNostoc sphaeroides

Gao

2004

European Journal of Phycology

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Algal size can affect the rate of metabolism and of growth. Different sized colonies of Nostoc sphaeroides were used with the aim of determining the effects of colony size on photosynthetic physiology and growth. Small colonies showed higher maximum photosynthetic rates per unit chlorophyll, higher light saturation point, and higher photosynthetic efficiency (a) than large colonies. Furthermore, small colonies had a higher affinity for DIC and higher DIC-saturated photosynthetic rates. In addition, small colonies showed higher photosynthetic rates from 5 -458C than large colonies. There was a greater decrease in Fv/Fm after exposure to high irradiance and less recovery in darkness for large colonies than for small colonies. Relative growth rate decreased with increasing colony size. Small colonies had less chl a and mass per unit surface area. The results indicate that small colonies can harvest light and acquire DIC more efficiently and have higher maximum photosynthetic rates and growth rates than large colonies.

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Survival and reproduction in some algae under stress conditions

Gupta

Agrawal

2007

Folia Microbiol

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Pithophora oedogonia and Cladophora glomerata survived lowest 60 and 58%, respectively, in June when the pond diurnal water temperature (PDWT) increased to a maximum of 28 degrees C. The lowering of PDWT only by 1 degrees C in July improved survivability of both algae to their almost maximum level of 100 and 96%, respectively. Further lowering of PDWT to 17-22 degrees C in November initiated akinete formation in P. oedogonia. The process of akinete initiation, maturation and germination continued till April when PDWT increased to 20-24 degrees C, but not beyond that in May when PDWT was 21-26 degrees C. By this time, probably all akinetes have germinated in situ, and the alga was entirely vegetative. P. oedogonia population is not synchronous in nature, since during the 5-6-month reproductive season, some filaments were in active vegetative stage, some had akinete initiation, some had completed akinete formation, and some had akinetes germinating. C. glomerata grew dense vegetative in November and initiated (zoo)sporangial primordia formation (to some extent) in February (when PDWT was lowest, viz. 10-14 degrees C) till April. Meanwhile, no (zoo)-sporangial primordia either produced any zoospore or germinated into a germ tube; and all released their cytoplasmic content and died (along with some vegetative cells) with an increase in PDWT to 21-26 degrees C in May. Vaucheria geminata vegetative patches appeared on the soil surface, 2nd week of January by lowering of atmospheric diurnal temperature (ADT) to 9-16 degrees C in the 1st week. The alga started sexual reproduction by the 2nd week of March (when ADT increased to 20-23 degrees C) and completed the process of reproduction by the 1st week of April (when ADT increased to 24-26 degrees C) and died thereafter. P. oedogonia, C. glomerata and V. geminata survived better and longer in submerged conditions than air-exposed (which was true for P. oedogonia and C. glomerata aquatic habitat and also indicated that the soil alga V. geminata could survive to some extent if submerged in rain water). P. oedogonia formed akinetes and C. glomerata (zoo)sporangial primordia only in submerged condition and not when air-exposed on moist soil surface. V. geminata did not complete the life cycle both under submerged and air-exposed conditions. Vegetative survival in P. oedogonia, C. glomerata, V. geminata, Aphanothece pallida, Gloeocapsa atrata, Scytonema millei, Myxosarcina burmensis, Phormidium bohneri, Oscillatoria animalis, O. subbrevis, Lyngbya birgei, L. major, Microcoleus chthonoplastes and Rhizoclonium crassipellitum, reproduction in P. oedogonia, C. glomerata and V. geminata, cell division in A. pallida and G. atrata, heterocyst and false branch formation in S. millei, all, were adversely affected at approximately 28.5 degrees C for t12 h at light intensity of approximately 160 micromol m(-2) s(-1); high intensity does not ameliorate high temperature damage to any algae. The presence of liquid water, than its absence, outside the different algae moderated the severity of...

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A unique thermal aquatic environment: A microbial characterization

Cited by 4 publications

References 20 publications

THE ECOLOGY OFNOSTOC

THE ECOLOGY OFNOSTOC

Photosynthetic physiology and growth as a function of colony size in the cyanobacteriumNostoc sphaeroides

Survival and reproduction in some algae under stress conditions

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