Velma (plural velme) is a Venetian dialect term derived from "melma" (mud). It is also used by Italian scientists to refer to lagunar mudflats (also called tidal flats), such as those found in the Lagoon of Venice. They are areas of shallow lagunar bottoms which are normally submerged, but emerge at low tides. They are generally without vegetation. Only associations of Zostera noltii (dwarf eelgrass) can be found. They originate from sediments carried by sea and stronger currents which are deposited on the lagoon bottom. They often surround the edges of the lagoon's barene (a venetian term for saltmarshes).
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| - Velma (geografia) (it)
- Velma (mudflat) (en)
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| - Velma (plural velme) is a Venetian dialect term derived from "melma" (mud). It is also used by Italian scientists to refer to lagunar mudflats (also called tidal flats), such as those found in the Lagoon of Venice. They are areas of shallow lagunar bottoms which are normally submerged, but emerge at low tides. They are generally without vegetation. Only associations of Zostera noltii (dwarf eelgrass) can be found. They originate from sediments carried by sea and stronger currents which are deposited on the lagoon bottom. They often surround the edges of the lagoon's barene (a venetian term for saltmarshes). (en)
- Velma è un termine che deriva del dialetto veneziano (alterazione di "melma") che indica una porzione di fondale lagunare poco profondo ma comunque normalmente sommerso che, tuttavia, emerge in particolari condizioni di bassa marea. Sono per questo generalmente prive di vegetazione (si possono constatare associazioni di Zostera noltii), a differenza delle barene che sono sommerse solo durante le alte maree. Traggono origine dai sedimenti trasportati da correnti marine e fluviali che poi si depositano sui fondali bassi. (it)
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| - Velma (plural velme) is a Venetian dialect term derived from "melma" (mud). It is also used by Italian scientists to refer to lagunar mudflats (also called tidal flats), such as those found in the Lagoon of Venice. They are areas of shallow lagunar bottoms which are normally submerged, but emerge at low tides. They are generally without vegetation. Only associations of Zostera noltii (dwarf eelgrass) can be found. They originate from sediments carried by sea and stronger currents which are deposited on the lagoon bottom. They often surround the edges of the lagoon's barene (a venetian term for saltmarshes). The velme, together with the barene (saltmarshes) and the shallow bottoms, constitute one of the most characteristic but also most fragile environments of the ecosystem of the Lagoon of Venice. They are subject to variations in their extent depending on the amount of materials (silt, sand and other sediments) they lose or acquire. Sediment acquisition leads to the consolidation of the velma's sediment soil and sediment loss leads to erosion of this soil. If the balance between consolidation and erosion fails, the velme and saltmarshes risk disappearing. (en)
- Velma è un termine che deriva del dialetto veneziano (alterazione di "melma") che indica una porzione di fondale lagunare poco profondo ma comunque normalmente sommerso che, tuttavia, emerge in particolari condizioni di bassa marea. Sono per questo generalmente prive di vegetazione (si possono constatare associazioni di Zostera noltii), a differenza delle barene che sono sommerse solo durante le alte maree. Traggono origine dai sedimenti trasportati da correnti marine e fluviali che poi si depositano sui fondali bassi. Dal punto di vista ecologico, anche le velme sono particolarmente interessanti, in quanto le forti variazioni di salinità e ossigenazione a cui sono soggette durante le emersioni e le successive sommersioni le rendono un ambiente ancor più selettivo di quello barenicolo. Ad esempio, il substrato (costituito soprattutto da fango e sabbia) offre riparo a policheti e molluschi durante la bassa marea. (it)
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