Microlife: Fish Creek Park - Spring run-off

Apr 4-10, 2009

These were two samples from Fish Creek. The first was taken while it was still partly covered in ice, but had melted on the sunnier side, where a boatsman was noticed. The second was a few days later, when the whole stream had become higher, swifter, and brownish. It was taken from a small dip where leaves were caught.

Both samples were sparse in some parts and richer in others, with a variety of creatures swept downstream. The most common were Strobilidium, with some vorticellids, flat spirotrichs, and scattered centric and pennate diatoms. The first also had some flagellates like Synura and small dinoflagellates, and a cluster of Carchesium.

A mayfly larva was found in the second sample, and its droppings may have promoted the appearance of films along the bottom, carrying vorticellids and round suctorians, with some clumps of Anthophysa nearby. Settled debris also had a few roundworms, Actinophrys, and extremely fast Askenasia, along with smaller protozoa.

Kingdom Plantae
…Phylum Chlorophyta – green algae

Chlorophyte
Chlorophyta - about 10 µm wide
Chlorophyte
Chlorophyta - about 20 µm wide
Spirogyra
Spirogyra - about 20 µm wide
Cosmarium
Cosmarium - about 30 µm

Kingdom Chromista
…Phylum Cryptista

Cryptomonas
Cryptomonas - about 40 µm

…Phylum Cercozoa

Euglyphid
Euglyphida - about 60 µm

…Phylum Ciliophora – ciliates

Aspidisca
Aspidisca - about 30 µm
Strobilidium
Strobilidium - about 65 µm
Spirotrich
Spirotrichea - about 110 µm
Spirotrich
Spirotrichea - about 150 µm
Spirotrich
Spirotrichea - about 170 µm
Ciliate
Ciliophora - about 105 µm
Phyllopharyngea
Phyllopharyngea - about 60 µm
Suctorian
Phyllopharyngea - body about 55 µm
Suctorian
Phyllopharyngea - body about 65 µm
Sessilida
Carchesium - bodies about 60-65 µm
Vorticella
Vorticella - body about 40 µm
Vorticellid
Vorticellidae - body about 55 µm

…Phylum Miozoa

Dinoflagellate
Peridinea - about 20 µm
Dinoflagellate
Peridinea - about 35 µm

…Phylum Ochrophyta – heterokont algae

Synura
Synura - colony about 60 µm
Anthophysa
Anthophysa - clusters about 20-25 µm
Actinophrys
Actinophrys - bodies about 50 µm
Diatoms
Diatomeae - about 25 µm
Diatoms
Diatomeae - about 55, 30 µm wide
Diatom
Diatomeae - extending about 205 µm
Diatoms
Diatomeae - about 80, 35 µm
Gomphonema
Gomphonema - body about 35 µm
Cymbella
Cymbella - body about 65 µm
Cymbella
Cymbella - about 110 µm
Diatom
Diatomeae - about 90 µm
Cymatopleura
Cymatopleura - about 115 µm

Kingdom Protozoa
…Phylum Amoebozoa

Tubulinea
Tubulinea - about 60 µm

Kingdom Animalia
…Phylum Gnathifera – rotifers & allies

Ploima
Ploima - about 95 µm
Brachionid
Brachionidae - about 150 µm

…Phylum Nematoda – roundworms

Roundworm
Nematoda - about 480 µm

…Phylum Tardigrada

Tardigrade
Tardigrada - about 190 µm

…Phylum Arthropoda – insects, crustaceans & allies

Mayfly larva
Ephemeroptera, larva - body about 7.2 mm

Uncertain objects

Unknown
Rolling flagellate colony - about 35 µm