Dear Researchers
I found this organisms on Roadside stagnant waters. which was forming a floating bloom. they are motile, colonial green algae with eyespot. there i could find two sized colonies weather both sized colonies are same genus or different.or the stage of life cycle. i also want to know about their reproduction method (gametes).
How to differentiate Pandorina and Eudorina?
In each genus what are key characters are there?
does these organisms are used in pollution indicator index?
i guess these are indicator of organic pollution, is it right?
please help me in identifying the species of these..
Dear colleague!
You have both genera in your sample. i.e. Eudorina spp. and Pandorina spp.
Eudorina spp. - colonies always motile, spherical or slightly elongate, of 16-32-64 cells lying some distance from one another and arranged to form a hollow sphere near the periphery of the homogeneous, hyaline, gelatinous envelope. Cells spherical, with or without a beak at the point of origin of the two cilia.
Pandorina spp. - colonies composed of 8, 16, or sometimes 32 cells, held together at their bases to form a sack globular colony surrounded by mucilage. The cells are ovoid or slightly narrowed at one end to appear keystone- or pear-shaped. Each cell has two flagella with two contractile vacuoles at their base, an eyespot, and a large cup-shaped chloroplast with at least one pyrenoid.
Best wishes
Bohuslav
Dear Elaya,
I supposed that Eudorina only with different stages of development (it is very complicated cycle) that produce changes in coenobiums of cells. But you have their other being (Photos 1 & 2) it looks like Halteria grandinella oligotrich ciliate from Classis Polyhymenophora – widespread and good indicator of saprobiological state.
Andrey
I agree with Bohuslav. An in detail description for Eudorina you can find here: http://www.algaebase.org/search/genus/detail/?genus_id=J646bb1440c319cc7&-session=abv4:AC1F12DB1395818963ks85741FBA and for Pandorina here: http://www.algaebase.org/search/genus/detail/?genus_id=w60d6ed00ddf7b04a&-session=abv4:AC1F12DB1395818963ks85741FBA.
Dear Elaya:
I agree with previous comments, you have Eudorina and Pandorina in your figure 4, but consider also Volvulina. Eudorina is characterized by cells arranged in alternating rings to form 16- to 32-celled coenobia, see in your fig. 4.
I include a transcription of the key presented by Bold & Wynne (1985). This text could help you to determine the generic limits, for determination of the species you will need more specific literature.
Kind regards.
Eugenia
1. Coenobia curved or flat, sometimes twisted 2
1. Coenobia spheroids or ellipsoids 3
2. Coenobia with posterior mammillate protuberances Platydorina (p. 105)
2. Coenobia without such protuberances Gonium (p. 101)
3. Cells of the coenobia uniform in size 4
3. Four or up to one-half of the cells at the anterior pole smaller in size than the
remainder 7
4. Cells pyriform, anteriorly truncate, or hemispherical 5
4. Cells spherical or elongate with processes 6
5. Cells contiguous at the center of the coenobium, not hemispherical Pandorina (p. 103)
5. Cells not contiguous, hemispherical Volvulina (p. 103)
6. Cells spherical, arranged in alternating tiers Eudorina (p. 104)
6. Cells elongate with irregular processes Stephanosphera(p. 114)
7. Coenobia with a few to 50% small, nonreproductive anterior cells Pleodorina (p. 106)
7. Coenobia composed mostly of small, nonreproductive cells; relatively few,
large, reproductive cells present in the posterior hemisphere Volvox (p. 109)
Dear Eugenia mam,
Thank you so much for your detailed answer, and thank you for introducing me genera Volvulina to me its quit interesting mam,
thank you all others too for your suggestions and view on my algae. thank you very much...
Elaya
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