Visibility III / V
For these, the season started as early as early June, but nothing really shocking has really happened yet. A few times brighter perimeter, but overall compared to last year, spending has been quite moderate so far. However, the water volumes in the pools have been much higher than last year. For example, last year's three separate pools are still one unified entity, although with the heat the surface has dropped at a tremendous rate. If the same pace continues, they may have differentiated into their own sluts as early as next week.
The best perimeters have hit the mornings, when the membrane on the surface of the observation pools is suitably thick after night to produce a perimeter. On the afternoon side of hot days, the composition of the films is already so thick that the perimeter barely stands out at all or not at all.
Last year, there was some debate about the cause of these, and strong suspicions even of a perimeter created by bacterial membranes were in the air. There was so much to dig into that I finally had to get the microscope done a little to help with the investigation. Yesterday, the first microscopies and results seemed more algae to bacteria than bacterial stuff to my own eyes, and of course Marko Riikonen confirmed the observation with his view. Thanks also to Marko for providing introductory material earlier, it made it easier for Scope to find the cause.
Yesterday's sampling took place in three different ponds where the perimeter has been visible (although only one of these stood out yesterday). All samples were strongly algal-weighted, of course e.g. a wide variety of small squirrels also swam in the field of vision among algae. Exercises are likely to continue for these, as conditions permit, to see if anything other than algae is released from it.
The first and second images show the surface of the same pool, first yesterday morning and then late afternoon. In the third and fourth views through the eyepiece, algal counts varied slightly depending on the basin. In the vitos and weaving pictures, the most spectacular morning circles of the season so far 15.6.