| Mare's eggs | |
|---|---|
 | |
Scientific classification | |
| Domain: | Bacteria |
| Kingdom: | Bacillati |
| Phylum: | Cyanobacteriota |
| Class: | Cyanophyceae |
| Order: | Nostocales |
| Family: | Nostocaceae |
| Genus: | Nostoc |
| Species: | N. pruniforme |
| Binomial name | |
| Nostoc pruniforme C.Agardh ex Bornet & Flahault | |
Nostoc pruniforme (Mare's eggs) are a species ofcyanobacterium. These freshwaterbacteria grow incolonies which take the form of dark green, gelatinous spheres with a smooth surface like a plum. It is common and widely distributed both geographically and ecologically in oligotrophic and mesotrophic freshwaters in temperate and sub-Arctic regions.[1]
In temperate lakes,N. pruniforme appears to grow in diameter from ~0·2 cm in late spring to 2–3 cm in midsummer and it can rapidly die off, supposedly because of attacks by viruses or bacteria at high summer temperatures (K. Sand-Jensen, unpubl. data). In contrast, in a cold (4 °C), nutrient-poor spring in Oregon, USA,N. pruniforme reached a handball size of 15–17 cm in diameter and weighed 2.6 kg after sustained slow growth for 9–14 years.[2] Very large colonies are also found in cold transparent lakes in Greenland (K. Sand-Jensen, unpubl. data). In addition to their larger size and persistence, they differ from Danish temperate specimens by having a more solid surface and a denser gel.
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