Scientific workrelated to water , May 2012 Augusta
How we did the work We studied two rivers (Belelle and Mandeo) and two intertidal zones (Ortigueira’s ria and Cobas beach). Dates: November and March Students involved: 1st ESO (12-13 year-olds), 2nd ESO (12-13 year-olds), 3rd ESO (14-15 year-olds), 4th ESO (15-16 year-olds) and 1st Bach (16-17 year-olds) Subjects: Biology, Chemistry and Science for the Contemporary World We worked on the field, in the lab and in class. We organised some conferences about these subjects.
RiversAspects observed: Parts of the course Flora and fauna Chemical data Anthropogenic action Pollution Uses: energy, agriculture, recreation
Parts of the rivers’ course The course of the rivers is divided in three parts: High course - The river has more inclination and carries little water. - Due to the inclination the water is very oxygenated. Middle course - Higher flow; affluents; riparian forest. Low course - Forms part of the estuary.
Parts of the rivers studied We only observed and collected data in the middle course and the low course of the rivers. In the middle course the water is more dynamic and has more disolved oxygen, so it is cleaner. This is the part where the water for human supply (consumption) comes from.
The low course of the river• The low course is less dynamic and the quantity of disolved oxygen is lower.• The low course may be under the influence of tides.
Flora: the riparian forestThe riparian forest is one of the most outstanding features of the river bank.It follows the river course.It’s important for the conservation of the river course.Common trees: European alder, sycamore plane, hazelnut tree, bay laurel and oak.
FAUNACalopterix virgo Salamander Gerris lacustris Erithacus rubecula Lutra lutra European robin European otter
Chemical dataWe measured temperature, pH, conductivity and dissolved oxygen in the middle course and the low course of the river.
Chemical data Part of the Temperature pH Conductivity Dissolved river oxygenBelelle river Middle 9.6 ºC 6.64 190 S/cm 8.5 ppm course Low course 10.1 ºC 7.15 251 s /cm 8.3 ppm Conclusions: The highest pH and conductivity are found in the low course due to the influence of tides.
Anthropogenic actionIt’s noticeable all along the course ofthe riverIt has been present for a long timebecause water is very useful andnecessary, as some constructions wefound on the way bear witness to.Nowadays, there is still pressure dueto the same reasons Some constructions in the river bank
Dolphin family - Calderon Intertidal zone: occasional fauna Purple sandpiper Larus argentatusCormoran Anas platyrhynchos
In the lab: seawater studyA sample of seawater and seaweed was taken to the lab. The aim of the study was: To separate the seaweed’s pigments by paper chromatography. To extract iodine from seaweed. To measure the density of seawater.