Feeding Flashcards
Smal particle feeding
Filter OM suspended in water.
Deposit, living and non-living OM. Mucociliary process
Suspension feeding
V efficient, feed on plankton
Choanocytes, direct cellular ingestion.
Mucociliary.
Setae/cirri, collect food, appendages.
Baleen.
Basking sharks, gill rakes
herbivore feeding tactics
Radula
Aristotles lantern
Predators
Hunting
Specialised radula
nematocysts
Fluid feeding
Suck juices, direct uptake of DOM
Sugars from symbionts
Intracellular digestion
Cavity, has openings at both ends. Mouth and anus
Enzymes in cavity break down food, absorbed into cells lining the cavity
Extracellular digestion
alimentary canal
Ingested through mouth, through oesophagus and stored in the crop.
Gut structure
Fore gut, ectodermal, ingestion and mechanical breakdown of food.
Mid, endodermal, diverticula, nutrient absorption.
Hind, Ectodermal, anus waste
Fore gut structure
Buccal cavity, salvia lubricates food and enzymes start digestive process.
Pharynx pumps food to gut, aid breakdown and mixing.
Oesophagus moves food from stomach to crop. Crop seen in organisms which have large infrequent meals.
mid gut structure
Muscular stomach.
Secretory/absorptive caeca, digestive enzymes, absorb food.
Intestine, intracellular digestion in low vertebrates.
Extra digestion in processing large masses of food
hind gut structure
Selective reabsorption of water and salt.
Elasmobranchs are ion regulating organs.
Faecal pellet formation
Meal processing
Batch, one meal after another.
Continuous without mixing, line up
Continuous with mixing
Loss of through gut
Lost gene for proton pump and pepsinogens.
Suspension feeders znd molluscs food to gut by cord of mucus.
Acids release food, alkaline to form faecal pellets.
Chordates, mucus to gut by cilia
Bivalves digestion
2 phase, rapid intake and slow glandular.
Avoid excess build up of metals.
Decrease ingestion under Cr.
Decrease proportion by glandular under increased Cr.
Modify processing to reduce Cr exposure
Role of microbes in fish
Microbes can breakdown algae.
When fish is feeding microbes produce enzymes.
partitions of microbial communities by anatomy in bowhead whales