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Nodularia is a genus of filamentous nitrogen-fixing cyanobacteria, or blue-green algae. They occur mainly in brackish or salinic waters, such as the hypersaline Makgadikgadi Pans, the Peel-Harvey Estuary in Western Australia or the Baltic Sea. Nodularia cells occasionally form heavy algal blooms. Some strains produce a cyanotoxin called nodularin R, which is harmful to humans.
An akinete is an enveloped, thick-walled, non-motile, dormant cell formed by filamentous, heterocyst-forming cyanobacteria under the order Nostocales and Stigonematales. Akinetes are resistant to cold and desiccation. They also accumulate and store various essential material, both of which allows the akinete to serve as a survival structure for up to many years. However, akinetes are not resistant to heat. Akinetes usually develop in strings with each cell differentiating after another and this occurs next to heterocysts if they are present. Development usually occurs during stationary phase and is triggered by unfavorable conditions such as insufficient light or nutrients, temperature, and saline levels in the environment. Once conditions become more favorable for growth, the akinete can then germinate back into a vegetative cell. Increased light intensity, nutrients availability, oxygen availability, and changes in salinity are important triggers for germination. In comparison to vegetative cells, akinetes are generally larger. This is associated with the accumulation of nucleic acids which is important for both dormancy and germination of the akinete. Despite being a resting cell, it is still capable of some metabolic activities such as photosynthesis, protein synthesis, and carbon fixation, albeit at significantly lower levels.
Rodeo Lagoon is a coastal lagoon located in the Marin Headlands division of the Golden Gate National Recreation Area, which is in southern Marin County, California. This brackish water body is separated from the Pacific Ocean by a sand bar that forms Rodeo Beach. Rodeo Lagoon stretches approximately 900 metres (3,000 ft) by 250 metres (820 ft), and is about 2 metres (6.6 ft) deep at its maximum depth. It covers a surface area of about 15 hectares.
Parmenini is a tribe of longhorn beetles of the subfamily Lamiinae.
Somatidia is a genus of longhorn beetles of the subfamily Lamiinae, containing the following species:
Somatidia spinicollis is a species of beetle in the family Cerambycidae. It was described by Broun in 1893.
Somatidia latula is a species of beetle in the family Cerambycidae. It was described by Broun in 1893. It contains the varietas Somatidia latula var. obesula.
Somatidia maculata is a species of beetle in the family Cerambycidae. It was described by Broun in 1921.
Somatidia angusta is a species of beetle in the family Cerambycidae. It was described by Broun in 1880. It is known from New Zealand.
Somatidia pennulata is a species of beetle in the family Cerambycidae. It was described by Broun in 1921.
Somatidia nitida is a species of beetle in the family Cerambycidae. It was described by Broun in 1880. It contains the varietas Somatidia nitida var. variegata.
Somatidia terrestris is a species of beetle in the family Cerambycidae. It was described by Broun in 1880. It contains the varietas Somatidia terrestris var. fuscata.
Somatidia parvula is a species of beetle in the family Cerambycidae. It was described by Broun in 1917.
Somatidia rufescens is a species of beetle in the family Cerambycidae. It was described by Stephan von Breuning in 1940.
Somatidia ampliata is a species of beetle in the family Cerambycidae. It was described by Stephan von Breuning in 1940. It is known from New Zealand.
Somatidia fauveli is a species of beetle in the family Cerambycidae. It was described by Stephan von Breuning in 1961. It is known from New Caledonia.
Somatidia kaszabi is a species of beetle in the family Cerambycidae. It was described by Stephan von Breuning in 1975.
Somatidia ptinoides is a species of beetle in the family Cerambycidae. It was described by Henry Walter Bates in 1874.
Somatidia helmsi is a species of beetle in the family Cerambycidae. It was described by David Sharp in 1882.
Somatidia australiae is a species of beetle in the family Cerambycidae. It was described by Carter in 1926. It is known from Australia.
References
- ↑ BioLib.cz - Somatidia nodularia. Retrieved on 8 September 2014.