Respected, before several days I have taken the samples from one artificial hidro ecosystem. I did not analyze the samples, just left the glasses because I was so tired. Yesterday I have seen something strange. Into the water, I saw several individuals that look like Turbellaria, but they were green. I never seen that species before. In the key for determination of Invertebrates I found that the species can be matched with Dalyellia viridis, Turbellaria species that lives in simbiosys with Plant species from the genus Chlorella. Now I wonder what can indicate Dalyellia viridis, maybe some kind of pollution, or could be indicatore of clean environment?
I must say that I did not understand almost nothing from your answer exept that I need to study in depth :)
Maybe you did not undesrtand what I try to find. For example, simple thing, Planaria alpina (Turbellaria) can be good bioindicator of clean water and that species lives only in water that are not polluted. Bacteria for colon origin could be good indicator of water pollution, or for example species Tubifex tubifex. What I want to find out, does the species Dalyellia viridis can be used for assessment of enviromental condition.
Thanks for the answer, you are kind.
Dear Amr, my record of Dalyellia viridis was accidental, but one fact is very important, one prof. from Sarajevo told me that he could not find any data about metioned species in Bosnia and Herzegovina. I will try to collect more samples.
On my knowledge and experience the record of Dalyellia viridis wouldn't indicate the condition of a water reservoir. This species prefer temporary reservoirs located in the floodplain. However sometime I've found it in permanent lakes and ponds. So if this species appears in a sample it indicates that the temperature of water, pH, level of oxygen, salinity, dissolved organic compounds and a food base are suitable for this species (as long as it is within the area of distribution of the species) and doesn't directly indicate how clear the water reservoir is. By the way "Planaria alpina" (as a matter of fact - Crenobia alpina) doesn't indicate the environmental condition as well. Crenobia just lives in relatively cold mountain water springs that usually are away from big cities and therefor much cleaner than water pools on urban territory. It wouldn't live in plain springs and rivers because of higher temperature of water plus some other chemical factors that doesn't belong directly to human influence.
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