3-3 Deposit Feeding

3-3 Deposit Feeding - Fe ding S s of MarineAnim e tyle als...

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Feeding Styles of Marine Animals Suspension/deposit feeding: Topic 16; Pages 283-291 in Levinton’s benthic chapter
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FEEDING STYLES : Suspension feeding collection of food particles from the water column Phytoplankton, POM and bacteria Clears water column by removing phytoplankton and suspended sediment Easy to measure
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Types of Suspension Feeders: 1. mucus sheet or bag water directed to a sticky mucus structure usually not selective 2. ciliary-mucus cilia direct water or particles to a mucus structure; mollusk gills selection possible and rejected particles called pseudofeces
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Figure 13.12 Mucus sheet
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Types of Suspension Feeding 3. setose setae act as sieves; crustaceans distance between setae important to particle selection
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Deposit feeding Deposit feeding is the ingestion of sediment particles Diverse sources of organic matter Difficult to measure
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Types of deposit feeding 1. Bulk feeders ingest particles with little or no selection Polychaetes and other taxa 2. Tentacles have ciliated tracks or grooves that deliver particles to mouth 3. Surface siphon vacuum cleaner approach used by some bivalves
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Figure 13.7
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Some animals do both: Streblospio benedicti, a polychaete Tentacles suspension feed in currents Tentacles placed on the sediment to deposit feed without currents
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Herbivores Graze microalgae, macroalgae or grasses Common on hard substrates sea urchins Some scrape, some chomp, some tear and rasp
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Figure 13.18
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Predator/Scavengers Variable styles Common in many, if not all, habitats Figure 13.17
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Animals may have symbiotic algae or bacteria: Coral Hydrothermal vent animals Others are being discovered Symbionts use light (photosynthesis) or chemicals including DOM and H 2 S (by chemosynthesis)
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Deposit feeding is odd: Sediment is a low-quality food source
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3-3 Deposit Feeding - Fe ding S s of MarineAnim e tyle als...

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