Microlife: Fish Creek Park - Hole in ice over creek

Jan 9-10, 2010

This was during a long Chinook, where west winds raised daytime temperatures to about 10 ºC. Fish Creek was covered by snow and thick ice, but near the middle of the stream there was a small hole, about one metre across and only partly frozen over. Some of the water, which was fast but very shallow, was taken along with a rock. To keep it cold, the container was kept in snow and refrigerated overnight.

There was some brownish material on the rock, and more settled out on the bottom. This was dominated by large numbers of diatoms. The most common were attached and free Cymbella, Encyonema, and especially needle-like araphids, often with smaller Cocconeis upon them. There were also several other colonial types and centric diatoms.

Along with these, there were several Actinophrys found in nearly every drop, with some feeding on the diatoms. Green algae were also fairly common, including Pseudopediastrum, a few different sorts of filaments, and some Closterium. On the second day small flagellates were becoming increasingly frequent as well.

Here and there were also small to large litostomes and other ciliates, including a few found near the surface of the water, where there was little else. Midge larvae were the most common animals but there were also various kinds of ploimid rotifer. Finally, there were two amoebae in debris from the bottom, one Cyphoderia and one Polychaos.

↬ Thanks to ciliatologist Dr. Peter Vďačný for the identification of what is likely Chaenea.

Kingdom Plantae
…Phylum Chlorophyta – green algae

Chlorophyte
Chlorophyta - about 12 µm wide
Chlorophyte
Chlorophyta - about 40 µm wide
Scenedesmaceae
Scenedesmaceae - about 25 µm
Pseudopediastrum
Pseudopediastrum - colony about 60 µm
Pseudopediastrum
Pseudopediastrum - colony about 60 µm
Chlorophyte dividing?
Chlorophyceae, dividing? - group about 75 µm
Zygnema
Zygnema - about 24 µm wide
Spirogyra
Spirogyra - about 22 µm wide
Closterium
Closterium - about 160 µm

Kingdom Chromista
…Phylum Cercozoa

Cyphoderia
Cyphoderia - about 105 µm

…Phylum Ciliophora – ciliates

Euplotes
Euplotes - about 115 µm
Spirotrich
Spirotrichea - about 130 µm
Spirotrich
Spirotrichea - about 240 µm
Litostome
Litostomatea - about 420 µm
Litonotus
Litonotus - about 105 µm
Litostomes, conjugating
Litostomatea, conjugating - about 140, 120 µm
Chaenea
Chaenea - about 175 µm
Ciliate
Ciliophora - about 75 µm
Ciliate
Ciliophora - about 115 µm

…Phylum Ochrophyta – heterokont algae

Actinophrys
Actinophrys - body about 60 µm
Actinophrys
Actinophrys - body about 45 µm
Diatoms
Diatomeae - about 12-14 µm
Diatoms
Diatomeae - about 145, 25 µm
Diatoma
Diatoma - cells about 50-55 µm
Diatoms
Diatomeae - cells about 30 µm
Diatoms
Diatomeae - cells about 70 µm
Diatoms
Diatomeae - about 30 µm wide
Diatoms
Diatomeae - about 45 µm wide
Diatoms
Diatomeae - extending about 135-155 µm
Nitzschia
Nitzschia - about 310 µm
Diatoms
Diatomeae - about 15-30 µm
Cocconeis
Cocconeis - about 23 µm
Diatoms
Diatomeae - cells up to 13 µm
Gomphonema
Gomphonema - cells about 45 µm
Encyonema
Encyonema - cells about 30 µm
Diatoms
Diatomeae - about 15-40 µm
Cymbella
Cymbella - cells about 105 µm
Cymatopleura
Cymatopleura - about 115 µm

Kingdom Protozoa
…Phylum Amoebozoa

Polychaos
Polychaos - about 120 µm wide

Kingdom Animalia
…Phylum Gnathifera – rotifers & allies

Colurella
Colurella - body about 100 µm
Ploima
Ploima - about 215 µm
Ploima
Ploima - body about 280 µm

…Phylum Annelida – segmented worms

Oligochaete
Clitellata - about 75-115 µm wide

…Phylum Nematoda – roundworms

Roundworm
Nematoda - about 200 µm

…Phylum Arthropoda – insects, crustaceans & allies

Midge larva
Chironomidae, larva - about 610 µm

Uncertain objects

Unknown
Non-moving in oval sheath - about 60 µm
Unknown
Non-moving cloud-like colony - cells about 10-20 µm