Microlife: Stormwater ponds - Loose debris

Oct 6-7, 2012
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At this point temperatures had started freezing at night, and there were only dried fragments of cattails left around this marsh. In the shallows these were surrounded by clumps of loose brownish debris, held together by some stringy algae. Here and there were some duckweeds with roots and a few insects, snails, and amphipods.

Stormwater pond
Loose debris

The water was visibly teeming with small crustaceans, mainly larger Simocephalus and smaller ostracods and cyclopoids. There were also a number of naidid worms around the duckweed, and some midge larvae, many more of which emerged from the muck during the night as it warmed and lost oxygen.

The filaments proved to be a mix of branched green algae and greenish cyanobacteria, along with some Vaucheria and others. There was also a wide variety of diatoms and ciliates. The most common of the latter were Loxodes and armophoreans typical of anoxic water, plus Urocentrum, vorticellids, and smaller oval kinds.

↬ Thanks to zoologist Dr. Alexander Kostenko for the identification of Strongylostoma and to protistologist Dr. Ferry Siemensma for the identification of Difflugia corona = Mediolus corona.

Kingdom Bacteria
…Phylum Cyanobacteria – blue-green algae

Oscillatoriales
Oscillatoriales - about 18 µm wide
Cyanobacteria
Cyanobacteria - about 10 µm wide
Nostocaceae, diatoms
Nostocaceae, Diatomeae - about 4 µm wide, 24-50 µm

…Phylum Proteobacteria – purple bacteria & allies

Spirillum
Proteobacteria - axis about 22 µm

Kingdom Plantae
…Phylum Chlorophyta – green algae

Chlorophyte
Chlorophyta - about 20 µm wide
Scenedesmaceae
Scenedesmaceae - about 20, 16 µm
Stauridium
Stauridium - colony about 18 µm
Hydrodictyaceae
Hydrodictyaceae - colony about 28 µm
Hydrodictyaceae
Hydrodictyaceae - colony about 40 µm
Hydrodictyaceae
Hydrodictyaceae - colony about 75 µm
Chlorophyte
Chlorophyta - about 13 µm
Mougeotia
Mougeotia - about 22 µm wide
Spirogyra
Spirogyra - about 22 µm wide
Spirogyra
Spirogyra - about 90 µm wide
Closterium, diatom
Closterium, Diatomeae - about 115, 50 µm
Closterium
Closterium - about 250 µm
Closterium
Closterium - about 300 µm
Cosmarium, diatom
Cosmarium - about 25 µm
Cosmarium, diatom
Cosmarium, Diatomeae - about 35, 18 µm

Kingdom Chromista
…Phylum Ciliophora – ciliates

Loxodes
Loxodes - about 135 µm
Loxodes
Loxodes - about 205 µm
Stentor
Stentor - about 240 µm
Euplotes
Euplotes - about 110 µm
Spirotrich
Spirotrichea - about 115 µm
Ciliate
Ciliophora - about 50 µm
Ciliate
Ciliophora - about 100 µm
Caenomorpha
Caenomorpha - body about 45 µm
Brachonella
Brachonella - about 85 µm
Metopus
Metopus - about 130 µm
Pleurostome
Pleurostomatida - about 65 µm
Ciliate
Ciliophora - about 120 µm
Ciliate
Ciliophora - about 50 µm
Urocentrum
Urocentrum - body about 60 µm
Frontonia
Frontonia - about 245 µm
Ciliate
Ciliophora - about 28 µm
Rhabdostyla
Rhabdostyla - about 35 µm
Lagenophrys
Lagenophrys - about 60 µm
Sessilida
Sessilida - bodies up to 100 µm
Vorticellids, Lepadella
Vorticellidae, Lepadella - bodies about 60-85, 95 µm
Vorticellids
Vorticellidae - body about 65-85 µm
Vorticellid
Vorticellidae - body about 90 µm

…Phylum Ochrophyta – heterokont algae

Vaucheria
Vaucheria - about 65-75 µm wide
Diatoms
Diatomeae - cells about 10 µm wide, 60 µm
Diatoms
Diatomeae - cells about 35 µm
Diatoms
Diatomeae - about 15, 29 µm wide
Fragilaria
Fragilaria - about 60 µm wide
Diatoms
Diatomeae - about 120 µm
Diatoms
Diatomeae - projecting about 250 µm
Diatom
Diatomeae - about 85 µm
Nostocaceae, diatoms
Diatomeae, Nostocaceae - about 24-50 µm, 4 µm wide
Diatom
Diatomeae - about 115 µm
Nitzschia
Nitzschia - about 265 µm
Nitzschia
Nitzschia - about 375 µm
Diatom
Diatomeae - about 70 µm
Diatoms
Diatomeae - about 100, 20-24 µm
Diatoms
Diatomeae - about 85, 100 µm
Diatoms
Diatomeae - about 30, 50, 65 µm
Diatoms
Diatomeae - about 24-26 µm
Cymbella
Cymbella - about 65 µm
Diatoms
Diatomeae - about 45 µm
Diatom
Diatomeae - about 105 µm

Kingdom Protozoa
…Phylum Euglenozoa

Euglenozoa
Euglenozoa - body about 35 µm
Euglenozoa
Euglenozoa - body about 40 µm
Phacus
Phacus - about 40 µm
Possibly dead Phacus
Possibly dead Phacus - about 90 µm
Euglenid
Euglenida - about 40 µm
Euglena
Euglena - about 120 µm

…Phylum Amoebozoa

Mayorella
Mayorella - about 55 µm
Mediolus corona
Mediolus - about 135 µm wide
Mediolus corona shell
Mediolus shell - about 125 µm

Kingdom Animalia
…Phylum Gnathifera – rotifers & allies

Testudinella
Testudinella - body about 175 µm
Lepadella
Lepadella - body about 95 µm
Ploima
Ploima - about 170 µm
Lecane
Lecane - body about 130 µm
Lecane
Lecane - body about 215 µm
Keratella shell
Keratella shell - body about 150 µm
Lophocharis
Lophocharis - body about 155 µm
Mytilina
Mytilina - body about 175 µm

…Phylum Gatrotricha

Chaetonotus
Chaetonotus - about 110 µm

…Phylum Platyhelminthes – flatworms

Strongylostoma
Strongylostoma - about 1.1 mm

…Phylum Annelida – segmented worms

Aeolosoma
Aeolosoma - about 1.2 mm
Aeolosoma
Aeolosoma - about 45-65 µm wide
Naidid
Naididae - about 5.2 mm
Naidid
Naididae - about 120 µm wide

…Phylum Mollusca

Tadpole snail
Physidae - shell about 3.1 mm
Ramshorn snail
Planorbidae - shell about 1.8 mm

…Phylum Nematoda – roundworms

Roundworm
Nematoda - about 530 µm

…Phylum Arthropoda – insects, crustaceans & allies

Mite
Acariformes - body about 470 µm
Podocopid
Podocopida - body about 580 µm
Podocopid
Podocopida - body about 675 µm
Cyclopoid
Cyclopoida - body about 500 µm
Cyclopoid
Cyclopoida - body about 760 µm
Cyclopoid
Cyclopoida - body about 1.1 mm
Copepod larva
Copepoda, larva - body about 200 µm
Amphipod
Amphipoda - body about 5.6 mm
Simocephalus
Simocephalus - body about 400 µm
Simocephalus
Simocephalus - body about 920 µm
Simocephalus
Simocephalus - body about 1.8 mm
Chydorid
Chydoridae - about 260, 300 µm
Midge larva
Chironomidae, larva - body about 120 µm wide
Midge larva
Chironomidae, larva - about 3.8 mm

Uncertain objects

Unknown
Turning flagellate - about 30 µm
Unknown
Non-moving - about 70 µm
Unknown
Non-moving shell-like - about 45 µm