Microlife: Duck pond - Muddy water

May 12-13, 2012
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This duck pond was largely surrounded by mud at this point. For the most part there were only dried remains of last year’s vegetations though here and there some small cattails were coming up. The water was relatively high but must have receded, since just a little higher up there were patches of empty pond snail shells.

Duck pond
Water beetle, pond snail
Springtails, cyclopoid

There were few ducks but lots of audible frogs, and many water striders, beetles, and pond snails in the shallows. The surface of the sample was covered in ephippia, at least partly from Daphnia, with a number of velvet springtails resting and hopping on top.

Below the water was teeming with crustaceans: ostracods, copepods, and various water fleas, particularly larger Simocephalus with visible young. Besides these and their tag-alongs the most obvious life was vorticellid colonies. There were also several types of rotifers and a few flatworms hiding among the ephippia or bottom dirt.

↬ Thanks to zoologist Dr. Alexander Kostenko for the identification of Phaenocora and to ciliatologist Dr. Ivan Dovgal for the identification of a cyst as likely Podophrya fixa.

Kingdom Plantae
…Phylum Chlorophyta – green algae

Pandorina, Ploima
Pandorina, Ploima - bodies about 35, 95 µm
Cosmarium
Cosmarium - about 30 µm
Cosmarium
Cosmarium - about 40 µm

Kingdom Chromista
…Phylum Ciliophora – ciliates

Spirotrich
Spirotrichea - about 60 µm
Spirotrich
Spirotrichea - body about 125 µm
Stylonychia
Stylonychia - about 140 µm
Phyllopharyngea
Phyllopharyngea - about 80 µm
Podophrya cyst
Podophrya, cyst - about 45 µm
Rhabdostyla
Rhabdostyla - bodies about 40 µm
Vorticellids
Vorticellidae - bodies about 60-70 µm

…Phylum Ochrophyta – heterokont algae

Diatoms
Diatomeae - about 95 µm
Diatom
Diatomeae - about 130 µm
Diatoms
Diatomeae - about 30-45 µm
Diatom
Diatomeae - about 90 µm
Diatom
Diatomeae - about 90 µm

Kingdom Protozoa
…Phylum Euglenozoa

Euglenid
Euglenida - about 50 µm
Euglenid
Euglenida - about 90 µm
Colacium
Colacium - bodies about 20-25 µm

Kingdom Animalia
…Phylum Gnathifera – rotifers & allies

Rotaria
Rotaria - about 420 µm
Lepadella
Lepadella - body about 90 µm
Lepadella
Lepadella - about 125 µm
Lepadella
Lepadella - about 155 µm
Ploima, Pandorina
Ploima, Pandorina - bodies about 95, 35 µm
Lecane
Lecane - body about 170 µm
Mytilina
Mytilina - body about 200 µm

…Phylum Platyhelminthes – flatworms

Phaenocora
Phaenocora - about 900 µm

…Phylum Mollusca

Pond snail
Lymnaeidae - shell about 1 cm

…Phylum Arthropoda – insects, crustaceans & allies

Podocopid
Podocopida - body about 370 µm
Podocopid
Podocopida - about 700 µm
Podocopid
Podocopida - about 950 µm
Podocopid
Podocopida - about 1.3 mm
Cyclopoid
Cyclopoida - body about 800 µm [composite]
Copepod larvae
Copepoda, larva - body about 90 µm
Water flea
Cladocera - body about 500 µm
Daphnia
Daphnia - body with spine about 1.8 mm [composite]
Daphnia ephippium
Daphnia, ephippium - main case about 1.2 mm
Simocephalus
Simocephalus - body about 860 µm
Simocephalus with young
Simocephalus with young - body about 2.7 mm
Springtail
Collembola - body about 1.1 mm
Water beetle
Coleoptera - body about 5.5 mm