Microlife: Stormwater ponds - Water from marsh

Apr 26-27, 2011
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Around this time most of the winter snow had disappeared, and though the deeper stormwater ponds were still frozen over, this shallower marshy area was completely melted. New plants had not come up yet, and there were only stands of brown cattails from last year, with long grass running down to them from the shore. However, there were already ducks, coots, and other birds, with water bugs and striders in the shallows.

Marsh
Red-winged blackbird

The sample was especially rich the first day, with many ciliates, rotifers, and countless minute flagellates. The main ciliates were flat spirotrichs, Strobilidium, and the round litostomes Askenasia and Monodinium, especially near the surface. Some vorticellids and bdelloids also occurred throughout.

On the other hand two sizes of Synchaeta were plentiful near the bottom, as well some Synura colonies. Other animals such as roundworms, cyclopoids, and especially ostracods were also more common here. Soon Daphnia began hatching from ephippia among the grass, and by the second day these arthropods dominated the sample.

↬ Thanks to protistologist Dr. Ferry Siemensma, author of Microworld, for the identification of Trinema enchelys shells.

Kingdom Bacteria
…Phylum Cyanobacteria – blue-green algae

Oscillatoriales
Oscillatoriales - about 17 µm wide
Oscillatoriales
Oscillatoriales - about 17 µm wide

Kingdom Plantae
…Phylum Chlorophyta – green algae

Spirogyra?
Spirogyra? - about 25 µm wide
Closterium
Closterium - about 145 µm wide

…Phylum Tracheophyta – vascular plants

Duckweed, Daphnia ephippium
Lemnoideae, Daphnia ephippium - about 2.6 mm, 1.2 mm
Dissected leaf
Tracheophyta, dissected leaf - about 4.8 mm

Kingdom Chromista
…Phylum Cercozoa

Trinema enchelys shells
Trinema enchelys shells - about 45-50 µm
Euglyphid shell
Euglyphida shell - about 50 µm

…Phylum Ciliophora – ciliates

Spirostomum
Spirostomum - about 370 µm
Euplotes dividing
Euplotes, dividing - halves about 50 µm
Strobilidium
Strobilidium - about 40 µm
Spirotrich
Spirotrichea - about 110 µm
Spirotrich
Spirotrichea - about 80 µm
Spirotrich
Spirotrichea - about 70 µm
Spirotrich
Spirotrichea - about 80 µm
Spirotrich, Phyllopharyngea
Spirotrichea, Phyllopharyngea - about 80, 90 µm
Ciliate
Ciliophora - about 30 µm
Metopus
Metopus - about 75 µm
Askenasia
Askenasia - about 35 µm
Askenasia
Askenasia - about 40 µm
Monodinium
Monodinium - about 90 µm
Ciliate
Ciliophora - about 105 µm
Vorticella
Vorticella - body about 35 µm
Vorticellid
Vorticellidae - body about 90 µm

…Phylum Ochrophyta – heterokont algae

Synura
Synura - colony about 65 µm
Anthophysa
Anthophysa - clusters about 20 µm
Vaucheria
Vaucheria - up to 140 µm wide
Diatoms
Diatomeae - about 75-80 µm
Diatoms
Diatomeae - about 105 µm
Diatoms
Diatomeae - about 50 µm
Diatoms
Diatomeae - about 40 µm
Diatoms
Diatomeae - about 110 µm
Diatoms
Diatomeae - about 110 µm

Kingdom Protozoa
…Phylum Euglenozoa

Euglenid
Euglenida - about 50 µm

…Phylum Amoebozoa

Arcella
Arcella - about 45 µm

Kingdom Animalia
…Phylum Gnathifera – rotifers & allies

Rotaria
Rotaria - about 400 µm
Bdelloid
Bdelloida - about 200 µm
Squatinella
Squatinella - about 150 µm
Squatinella
Squatinella - about 200 µm
Ploima
Ploima - about 240 µm
Ploima
Ploima - about 85 µm
Lecane
Lecane - body about 135 µm
Synchaeta
Synchaeta - about 175 µm
Synchaeta
Synchaeta - about 240 µm

…Phylum Nematoda – roundworms

Roundworm
Nematoda - about 360 µm
Roundworm
Nematoda - about 1.5 mm

…Phylum Arthropoda – insects, crustaceans & allies

Water mite
Acariformes - body about 700 µm
Podocopid
Podocopida - about 410 µm
Podocopid
Podocopida - about 540 µm
Cyclopoid
Cyclopoida - about 1.1 mm [composite]
Daphnia
Daphnia - about 1.8 mm [composite]
Daphnia ephippium
Daphnia, ephippium - about 1.2 mm

Uncertain objects

Unknown
Grooved flagellates - about 15-17 µm
Unknown
Tumbling flagellates - colony about 25 µm
Unknown
Spore-like objects - about 16-35 µm