IMG_NEW - HsC L I 6ct, / Lecture 2: Digstion Nutrition,...

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/ HsC L I 6ct, Lecture 2: Nutrition, digestion and bioenergetics l.Why do animals need to eat? $ -food provides chemicalglggy in the form of carbohydrates, lipids and protein for cellular respiration and energy storage @ -food provides raw ryEialr for biosynthesis of complex molecules (e.g. proteins) needed for growth, maintenance and reproduction Q -the diet must provide essential nutrients that animals cannot synthesise themselves Four main feedingrhechanisms have evolved among animals (Fig. 41.6) ) Substrate feeders - live in or on their food source, e.g. this leaf miner caterpillar is eating through an oak leaf ) nuiO feeders - suck nutrient-rich fluid from a living host, e.g. this mosquito consuming a blood meal or plant-sucking insects (aphids) )) Suspension feeders - sift small food particles from water, e.g. humpback whale or barnacles Bulk feeders (most animals) - ingest relatively large pieces of food, e.g. rock python ingesting whole gazelle or giant petrels 2. Food processing occurs in 4 stages.
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This note was uploaded on 12/29/2011 for the course HSCI 160 taught by Professor Kreis during the Fall '10 term at Simon Fraser.

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