Rubus, Arundo and Algae

פורסם: March 15th, 2008 | עודכן: 16/01/15

[Rubus sanguineus]

[“Rubus sanguineus” R. sanguineus] is a plant that grows near fresh water springs and river banks in the rainy part of the country. Two springs may be seen (Fig. 4.4.1) on a mountain slope of the former village Sataf. The main component of the green triangles in the above figure is [“Rubus sanguineus” R. sanguineus] (Figs. 4.4.2 and 4.4.3). Its presence testifies to the presence of fresh water.

Fig. 4.4.1: The springs of Sataf may be seen from afar due to the green triangles, mainly of Rubus sanguineus.

Fig. 4.4.2: Rubus sanguineus has light to dark pink petals, and fruits that become dark red when ripe.

Fig. 4.4.3: Rubus sanguineus in a place where the soil is wet and not saline, all year round.

Layer springs between Kfar Haruv and En Gev

Fig. 4.4.4: A few springs may be seen on the limestone cliffs east of the Sea of Galilee as patches of green plants.

Looking from the beaches of the Sea of Galilee eastwards, permanently green patches may be seen on the white cliffs east of En Gev and HaOn (Fig. 4.4.4). It is hard to determine from afar which plants are the main contributors. Since they are in an area where land-mines may be hidden in the ground, it is better to observe these places with field binoculars. Along the Golan cliffs, in a few places, not far from asphalt roads, plenty of reeds may be seen – mainly of [Arundo donax] and [Phragmites australis].

Algae assist in discovering hidden water

On the right hand side of Fig. 4.4.5a a white line may be seen in the wadi center. This line is clearer in Fig. 4.4.5b. However, much of the secret is revealed in Fig. 4.4.6. As in [usefulplantsd3 Fig. 4.3.3], so in Fig. 4.4.6, green algae develop in sites where fresh water flows. The algae absorb the CO2 they need from the water; each molecule of CO2 taken from the water participates in the formation of organic matter. This leads to deposits of white colored CaCO3 (calcium carbonate), which is clearly seen when developing on dark stones.

Fig. 4.4.5: Former seepage line revealed by calcium carbonate sediment – the result of algal activity (as in Fig. 4.3.3) on the dark stones.

Fig. 4.4.6: A seepage point in the wadi with calcium carbonate sediment around the green algae.