Potamogeton


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Related to Potamogeton: pondweed

Potamogeton

 

(pondweed), a genus of perennial aquatic herbs of the family Potamogetonaceae. The alternate leaves are petiolate or sessile and submerged or floating; they range in shape from almost round to threadlike. The inconspicuous and bisexual flowers are in spikes that are usually above the water. The perianth consists of four round valvate lobes; there are four stamens, with no filaments. The fruit consists of four drupaceous lobes. The plants are usually anemophilous.

There are approximately 100 species of pondweed, distributed throughout the world in standing or slow-flowing fresh or, less often, slightly salty waters. The USSR has more than 40 species, which include the broad-leaved pondweed (P. natans), the perfoliate pondweed (P. perfoliatus), the curled pondweed (P. crispus), and the shining pondweed (P. lucens). Small animals that are eaten by fish live on the underwater parts of the plants; fish spawn in pondweed thickets. Some species are eaten by waterfowl. Pondweed thickets often hamper the movement of small boats.

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This zone may support submerged aquatic plants such as Eel Grass Vallisneria americana and Pondweeds Potamogeton species.
and Potamogeton nodosus) are common species of many aquatic habitats in Illinois (Vogel and Ebinger 1979, Dolbeare and Ebinger 1974).
Potamogeton pusillus can be easly recognized among Neotropical species with submersed leaves, free basal sheats and linear blades by the absence of keels in its fruits (Haynes and Holm-Nielsen, 2003).
Typha domogensis, Phragmites vollatoria are the emergent plants, Nelumbo nucifera are attached floating plant and Potamogeton pectinatus are submerged forming beads and become food for fishes and migratory birds.
Ejemplos de las que registran una distribucion altitudinal amplia son Lemna aequinoctialis y Potamogeton pusillus, pues sus poblaciones se conocen desde el nivel del mar hasta mas de 3000 m.
These observations are in agreement with the work of Kadano (1984), who observed that Potamogeton distinctus overcomes the long lasting drought in irrigation reservoirs under warm temperature conditions by the formation of seeds.
En cuanto a la vegetacion acuatica se encontraron concordancias entre las comunidades de Isoetes palmeri (C-13), Crassula venezuelensis (C-14), Callitriche nubigena (C-16) y Potamogeton illinoensis (C-18) con aquellas descritas por Cleef (1981) y Cleef et al.
X POTAMOGETONACEAE (Pondweed Family) Potamogeton diversifolius Raf.
La mayoria de los registros previos al trabajo de Ross (1) provienen de rios, arroyos y lagunas, sobre Phragmites, Paspalidium, Potamogeton, Lagarosiphon, Ceratophyllum y sustratos duros (naturales o artificiales) en aguas someras y ocasionalmente en el plancton.
Siete especies fueron nuevos reportes para el area de estudio; cinco fueron encontradas en los canales, sumergidas o en los bordes: Plantago major, Rumex obtusifolius, Limnobium laevigatum, Elodea potamogeton, Colocasia esculenta, Alternanthera haliimifolia, Alternanthera pubiflora.