June 30-July 2, 2012
This was from around a short pier surrounded by pondweed, where the water was about one metre deep. Some of the floating strands were taken along with other debris like hornwort, small leaves, and brown catkins. There was also a second sample scooped up from the bottom, which was mostly sand, home to many visible amphipods.
Diatoms were found throughout, especially Cocconeis, which was common both on films at the top and among settled debris. It also occurred alongside Rhoicosphenia on a ball of floating algae, apparently Cladophora though with sparse branching. Vorticellids were found on both this algae and larger plants, particularly the hornwort.
Free-swimming ciliates, rotifers, and some Cryptomonas were also found in both samples, but most often around the surface. The most common of these were oval and narrow types of spirotrichs, smaller Phyllopharyngea, and green Paramecium. Besides the types pictured here there was also a fast Synchaeta.
Spirotrichea - about 45 µm
Spirotrichea, dividing - about 260 µm
Spirotrichea - about 85 µm
Spirotrichea - body about 80 µm
Spirotrichea - body about 100 µm
Spirotrichea - body about 120 µm
Spirotrichea, dividing - body about 120 µm
Same 8½ min. later - halves about 65 µm
Phyllopharyngea - about 45 µm
Vorticellidae - body about 50 µm
Vorticellidae - bodies about 80-90 µm
Vorticellidae - body about 85 µm