Ruppia


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Ruppia

 

a genus of aquatic perennial herbs of the family Ruppiaceae (formerly included in the family Potamogetonaceae). Except for the inflorescence, the plant is completely submerged in the water. The threadlike leaves are alternate or opposite. The small, bisexual flowers are in a two-flowered terminal spike. A perianth is absent. The fruit generally consists of four to six drupaceous lobes borne by long, thin pedicels. There are three or four species, distributed in the temperate and subtropical zones. The plants grow in saltwater and brackish shallows along the shores of seas and inland waters. There are two species in the USSR—R. maritima and tassel pondweed (R. spiralis). The plants serve as food for swimming birds.

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As we hypothesized, the SAV community in Grand Bay NERR displayed significant short-term temporal changes in overall abundance and species dominance between Ruppia maritima and Halodule wrightii (Table 2; Figs.
Spatial coverages of eelgrass (Zostera marina) and widgeon grass (Ruppia maritima) were determined using randomized transect lines (N=14) adjacent to Ham Island.
The lower parts of the streams possess brackish marsh vegetation including Cattail (Typha dorningensis), Ditch Grass (Ruppia maritima), Spiny Rush (Juncus acutus), Annual Pickleweed (Salicornia bigelovii), Saltgrass (Distichlis spicata) and Bulrushes (Scirpus californicus (Delgadillo-Rodriguez et al.
On exposure to solutions of phenyl mercuric hydroxide and phenyl mercuric nitrate, shoot apexes of the monocotyledons Zea mays, Anacharis canadensis, and Ruppia maritima and of the dicotyledons Colcus blumei and Raphanus sativus showed different types of somatic mutations (MacFarlane, 1956; MacFarlane & Messing, 1953), in addition to c-mitosis, inhibition of spindle formation, and other chromosomal alterations in Allium cepa roots (see De Flora et al., 1994).
Spatial variation in the [delta][sup.13C] signature of Ruppia megacarpa (Mason) in coastal lagoons of southwestern Australia and its implication for isotopic studies.
Agardh) Ouriques & Bouzon, 2000 as Ectocarpus breviarticulatus Magnoliophyta: Liliopsida: Ruppia maritima Linnaeus, 1753 Najadales: Ruppiaceae Magnoliophyta: Liliopsida: Halophila baillonis Ascherson, Alismatales: Hydrocharitaceae 1874 Magnoliophyta: Magnoliopsida: Avicennia sp.
La transformacion, destruccion y desaparicion de los ecosistemas acuaticos de la region han propiciado la reduccion del area de distribucion natural de las acuaticas antes mencionadas y de otras como Ceratophyllum demersum, Lilaea scilloides, Myriophyllum heterophyllum, Sagittaria latifolia, Ruppia maritima, Potamogeton nodosus y Wolffiella oblonga, que si bien muchas de ellas son abundantes en otras partes de Mexico (Lot et al., 1999), en la zona de estudio son consideradas como especies raras y potencialmente amenazadas, dado que sus poblaciones tienen una distribucion muy restringida (Ramos, 2000).
Strong flood tidal currents along the north channel have opened a 50-in-wide breach in the beach and tidal marshes protecting Little Bay destroying valuable tidal marsh (Spartina alterniflora) and submerged aquatic vegetation (Ruppia maritima and Zostera marina) and drastically affecting invertebrate, shorebird, and wildilife populations that once utilized these habitats.
Various transplanting methods and materials were used to determine whether Halodule wrightii and Ruppia maritima could be restored to the area since environmental conditions have improved.
Nekton use of Ruppia maritima and nonvegetated bottom habitat types within brackish marsh ponds.
Playa Iguanita, MZUCR-1977-01, 2 individuos, 11 setiembre 1994, 3 m profundidad, asociados al pasto marino Ruppia maritima, 11 setiembre 1994 (col.