Microlife: Chestermere Lake - Debris from shore

Sep 20-26, 2008
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This was from Chestermere Lake, where leaves and weeds had begun washing against a sandy bank. Among the debris there were some cloud-shaped Ophrydium colonies, with many more floating or on submerged plants further out, as well as some amphipods and insects. Both plant material and sand were taken, with two small leeches and a ramshorn snail emerging once these had settled.

Debris from shore
Ophrydium colony

Many cyclopoids were active around the top of the sample. The debris and sand contained a variety of pennate diatoms, including some Fragilaria and Asterionella, along with frequent Merismopedia sheets. There were also clumps of Zygnema and other filaments including Spirogyra, Mougeotia, and some thicker green algae.

Here and there vorticellids were attached to the debris, sometimes accompanied by Stentor and bdelloids. Many other types of ciliates were also found, notably long Spirostomum and colepids. There were also red flagellates scattered among the plant material, sometimes with small euglenoids and colourless kinds.

A portion of an Ophrydium colony was also taken but after a few days it lost cohesion; the cells died while needle-like diatoms inside it increased. With this the water changed in smell and innumerable colourless Cryptomonas appeared, along with more colepids. Other animals and ciliates seemed less affected.

Kingdom Bacteria
…Phylum Cyanobacteria – blue-green algae

Merismopedia
Merismopedia - 8×8 blocks up to 45 µm

Kingdom Plantae
…Phylum Chlorophyta – green algae

Chlorophyte
Chlorophyta - about 75 µm wide
Pandorina
Pandorina - colony about 35 µm
Chlorophyte dividing?
Chlorophyceae, dividing? - clusters about 12 µm
Chlorophyte
Chlorophyta - about 20 µm wide
Chlorophyte
Chlorophyta - about 35 µm wide
Mougeotia
Mougeotia - about 25 µm wide
Zygnema
Zygnema - cells about 40 µm wide
Spirogyra, Cothurnia
Spirogyra, Cothurnia - about 20 µm wide, case 40 µm
Closterium
Closterium - about 270 µm
Closterium
Closterium - about 290 µm

Kingdom Chromista
…Phylum Cryptista

Cryptomonas
Cryptomonas - up to 20 µm

…Phylum Ciliophora – ciliates

Loxodes
Loxodes - about 165 µm
Ciliate
Ciliophora - about 110 µm
Ciliophora
Ciliophora - about 285 µm
Spirostomum
Spirostomum - about 1.3 mm [composite]
Stentor
Stentor - front about 105 µm wide
Spirotrich
Spirotrichea - about 50 µm
Spirotrich
Spirotrichea - about 135 µm
Spirotrich
Spirotrichea - about 75 µm
Stylonychia
Stylonychia - body about 160 µm
Amphileptus, Colepid
Amphileptus, Colepidae - about 255, 40 µm
Colepid dividing
Colepidae, dividing - halves about 25 µm
Paramecium
Paramecium - about 145 µm
Ophrydium
Ophrydium - about 200 µm
Ophrydium telotroch
Ophrydium, telotroch - about 45 µm
Vorticellid
Vorticellidae - body about 65 µm
Vorticellid
Vorticellidae - body about 100 µm

…Phylum Ochrophyta – heterokont algae

Asterionella
Asterionella - cells about 75 µm
Fragilaria
Fragilaria - about 85 µm wide
Diatom
Diatomeae - about 165 µm
Gyrosigma
Gyrosigma - about 110 µm
Diatom
Diatomeae - about 55 µm
Diatom
Diatomeae - about 100 µm
Cocconeis
Cocconeis - about 25, 20 µm
Diatom
Diatomeae - about 85 µm

Kingdom Protozoa
…Phylum Euglenozoa

Peranema
Peranema - body about 55 µm
Euglenid
Euglenida - about 65 µm

Kingdom Animalia
…Phylum Gnathifera – rotifers & allies

Bdelloid
Bdelloida - body about 40 µm wide
Colurella
Colurella - body about 95 µm
Lepadella
Lepadella - about 110 µm
Ploima
Ploima - about 100 µm
Euchlanis
Euchlanis - about 330 µm
Notholca
Notholca - about 140 µm

…Phylum Annelida – segmented worms

Oligochaete
Clitellata - about 910 µm

…Phylum Arthropoda – insects, crustaceans & allies

Cyclopoid
Cyclopoida - body about 340 µm
Copepod larva
Copepoda, larva - body about 120 µm
Copepod larva
Copepoda, larva - body about 300 µm
Fly egg?
Diptera, egg? - about 225 µm

Uncertain objects

Unknown
Red flagellate - about 25 µm
Unknown
Small heliozoan - body about 25 µm