Microlife: Chestermere Lake - Plants and sediment

June 30-July 2, 2012
Previous sample

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.

Pondweed

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.

Kingdom Bacteria
…Phylum Cyanobacteria – blue-green algae

Merismopedia
Merismopedia - 8×8 blocks up to 60 µm

Kingdom Plantae
…Phylum Chlorophyta – green algae

Cladophora
Cladophora - up to 60 µm wide
Scenedesmaceae
Scenedesmaceae - about 16 µm
Hydrodictyaceae
Hydrodictyaceae - about 30 µm
Chlorophyte
Chlorophyta - about 8 µm
Spirogyra
Spirogyra - about 30 µm wide

Kingdom Chromista
…Phylum Cryptista

Cryptomonas
Cryptomonas - about 27 µm
Cryptomonas
Cryptomonas - about 45 µm

…Phylum Ciliophora – ciliates

Ciliate
Spirotrichea - about 45 µm
Euplotes
Euplotes, Cocconeis - about 40, 20-30 µm
Euplotes
Euplotes - about 55 µm
Strobilidium
Strobilidium - about 50 µm
Holosticha
Holosticha - about 95 µm
Spirotrich, dividing
Spirotrichea, dividing - about 260 µm
Spirotrich
Spirotrichea - about 85 µm
Spirotrich
Spirotrichea - body about 80 µm
Spirotrich
Spirotrichea - body about 100 µm
Spirotrich
Spirotrichea - body about 120 µm
Spirotrich, dividing
Spirotrichea, dividing - body about 120 µm
Spirotrich dividing
Same 8½ min. later - halves about 65 µm
Phyllopharyngea
Phyllopharyngea - about 45 µm
Paramecium
Paramecium - about 115 µm
Vorticellid
Vorticellidae - body about 50 µm
Vorticellids
Vorticellidae - bodies about 80-90 µm
Vorticellid
Vorticellidae - body about 85 µm

…Phylum Ochrophyta – heterokont algae

Asterionella
Asterionella - cells about 85 µm
Diatom
Diatomeae - about 35 µm
Diatom
Diatomeae - about 85 µm
Diatom
Diatomeae - about 175 µm
Nitzschia
Nitzschia - about 160 µm
Nitzschia
Nitzschia - about 205 µm
Diatom
Diatomeae - about 185 µm
Gyrosigma
Gyrosigma - about 135 µm
Diatom
Diatomeae - about 50 µm
Diatoms
Diatomeae - about 15-40 µm
Cocconeis
Cocconeis - about 35 µm
Rhoicosphenia
Rhoicosphenia - about 25 µm
Encyonema
Encyonema - about 25 µm
Diatom
Diatomeae - about 35 µm

Kingdom Protozoa
…Phylum Euglenozoa

Euglenid
Euglenida - about 35 µm

…Phylum Amoebozoa

Arcella
Arcella - shell about 75 µm

Kingdom Animalia
…Phylum Cnidaria

Hydra
Hydra - body about 4.5 mm

…Phylum Gnathifera – rotifers & allies

Bdelloid
Bdelloida - about 100 µm wide
Rotifer
Gnathifera - about 120 µm
Colurella
Colurella - body about 95 µm
Ploima
Ploima - body about 95 µm
Ploima
Ploima - body about 70 µm
Ploima
Ploima - body about 95 µm
Ploima
Ploima - about 260 µm
Euchlanis
Euchlanis - about 315 µm
Notholca
Notholca - about 150 µm

…Phylum Gastrotricha

Chaetonotus
Chaetonotus - about 80 µm

…Phylum Mollusca

Tadpole snail
Physidae - shell about 1.9 mm

…Phylum Nematoda – roundworms

Roundworm
Nematoda - about 270 µm

…Phylum Arthropoda – insects, crustaceans & allies

Amphipod
Amphipoda - body about 1.5 mm
Amphipod
Amphipoda - body about 5.4 mm

Uncertain objects

Unknown
Egg-like object - about 85 µm
Unknown
Case with three moving creatures - about 5.5 mm