Canadian waterweed

Dichtblättrige Wasserpest (Egeria densa) (mit Neonfischen im Aquarium)

Dichtblaettrige Canadian waterweed (Egeria densa)
(also Neon fish in the aquarium)

:	(Liliopsida)
:	Frog spoon something similar (Alismatidae)
:	Frog-spoon-shaped (Alismatales)
:	Frog bite plants (Hydrocharitaceae)
:	Canadian waterweed

Elodea

Michx.

Those Aquatic plants- Canadian waterweed (Elodea) (Syn.: Anacharis) belongs to that Frog bite plants (Hydrocharitaceae) and covers twelve . Their green, flexible Staengel, those in the distance from few millimeters quirlig with mostly three to four oblong are occupied, can depending upon up to three meters become long and roots in the waters reason. Kinds of Canadian waterweed are are u. A. those Cancer shears (Stratiotes of aloides L.) and that Frog bite (Hydrocharis morsus ranae L.).

1 Kinds in Central Europe
2 Characteristics
- 2.1 Elodea canadensis
- 2.2 Elodea nuttallii
3 Occurrence
4 "ghost" becomes green
5 Canadian waterweed in the aquarium
6 Literature
7 Web on the left of

Kinds in Central Europe

Canadian Canadian waterweed – Elodea canadensis Michx.
Nuttalls Canadian waterweed (Schmalblaettr. W.) – Elodea nuttallii (plan CH) H. St. John
Argentine Canadian waterweed – Elodea of callitrichoides (Rich.) Casp.

All these kinds are Neophyten in Europe; they originally originate from North America (E. canadensis, E. nuttallii) and/or. from South America (E. callitrichoides). Their settlement and propagation in Europe became by purposeful suspensions (z.B. by aquarium owners) and u favours. A. by kidnapping promoted by means of the navigation and by water birds further. At least the two North American kinds, which find comparable climatic conditions in Europe as in their homeland, have themselves here in the last century (E. canadensis) and/or. the last decades (E. nuttalii) rapidly spread and rank in the meantime among the usual kind inventory of many ponds, lakes and water ditches.

Apart from the kinds of the kind Elodea still further kinds from the family, neophytische in Central Europe (Germany), are that Frog bite plants to mention, which occur only rarely and sporadically however:

Canadian waterweed, sea-roses and Laichkraut

Dichtblaettrige Canadian waterweed – Egeria densa Planchon; Syn. Elodea densa (plan CH) Casp.
(see Picture in the Taxobox)
Grundnessel – Hydrilla verticillata (L f.) Royle
Usual water screw – Vallisneria spiralis L.
Large change sheet Canadian waterweed – Lagarosiphon major (Ridl.) Moss

In the following one only the two frequent kinds become Elodea canadensis and Elodea nuttallii continues to treat.

Characteristics

Elodea canadensis

The submerged rung reach a length from 30 to 100 centimeters. At the flooding Staengeln the small, dark-green sheets sit closely quirlig usually too third (two to four). They are up to three centimeters long, softly or rigidly, zungenfoermig and in front rounded off. The length of the sheets constitutes the two to fivefold their width (1.5 to 3.5 millimeters). Compared with E. nuttallii the kind works more compactly and evenly beblaettert. The inconspicuous, three to 5.5 millimeters small, whitish-lightviolet blooms sit on long whitish handles, those over the water surface rise up and/or. there rest upon. E. canadensis is zweihaeusig; into Central Europe however only copies with female blooms come forwards (bloom time: May until August), so that no generative vermehrung takes place. The propagation takes place particularly over broken off sprouting hurry, which are drifted or for example to water birds to adhere. The Canadian Canadian waterweed originally originates from the moderate widths and became by ships first after brought in, where it the first time for Europe was documented. it became in suspended. From there it spread then in only 20 years over completely to Central Europe.

Elodea nuttallii

The submerged rung become likewise 30 to 100 centimeters long. At the flooding Staengeln the small, dark-green sheets sit quirlig usually too third. They are up to three centimeters long, often rigidly, narrowly triangular to linealisch, back-curved and strongly spiral turned. The length of the sheets constitutes the 3,5 to tenfold their width (up to three millimeters). Compared with E. canadensis the kind works more ripple-industrial union-unevenly and more narrowly beblaettert. The inconspicuous, three to five millimeters small, whitish-lightviolet blooms sit on long whitish handles, those over the water surface rise up and/or. there rest upon. Also E. nuttallii is zweihaeusig, however only copies with male blooms step on into Central Europe (bloom time: June until Septembers). The vermehrung takes place therefore also here purely . Nuttalls Canadian waterweed becomes for instance since end that already wrote 9. October 1910 in day sheet over the Canadian Canadian waterweed:

Canadian Canadian waterweed and Pond rose

„It erhub everywhere terrible howling and tooth rattling, because the day did not seem itself far any longer, since all inland waters of Europe up to the edge were filled with the Kraute, so that drive no more ship, no more humans bathe, no more duck gruendeln and no more fish could swim (...)."

Strong and fast, the propagation ability and growth nearly like an explosion of the Canadian waterweed are thus already for a long time well-known in Europe. In the meantime is Elodea canadensis but again decreased/gone back and forms hardly still mass existence. On the other hand causes Elodea nutallii since that years increasingly problems. The occurrences are exemplary along that in , and . There it obstructs by its mass occurrence (clog from run hydro-electric power plants and air-locks), , and . The responsible person reduces there the existence meanwhile regularly with an own Maehboot.

That accommodates large existence

As an ecological reciprocal effect it is to be mentioned that the propagation of the Canadian waterweed debited to other, fewer competitive underwater plants that Laichkraut- and Arm light ral geneCompanies happened knows. In the meantime the kinds of Canadian waterweed seem to compete however already among themselves in Central Europe, whereby already longer the established E. canadensis of the "younger" E. nuttallii obviously partly again one displaces. Problematic herbstliche dying of the plants is, their over quantity on to of waters to lead can. Meanwhile many existence settled down however on a more moderate measure, because u. A. domestic Thread worms their buds eat and it thereby in growth limit. After the people faith the plant is to further-pull "every seven years".

As positive characteristic is the strong activity, which is well visible during sun exposure on the basis Perl cord-like ascending air vesicles. Their comparatively high and other water animals Unterschlupf and oviposition places. The plant has a high naehrwert - which contains trockensubstanz 18 % protein, 42 % strength and 2.5 % fat -, why it was recommended in former times even as viehfutter.