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Slide 1: A closer look at ecosystems Slide 2: Different types of ecosystems A variety of ecosystems exist. These can range from desert types where the temperature during the day exceeds 100ºC and the nighttime temperature falls below XºC. In deserts, the amount of rain is Slide 3: What is an ecosystem? Slide 4 and 5: Where does energy flow and chemical cycling occur? Slide 6: Ecosystems continued Discusses the components of the talk. Slide 7: Primary producers Primary producers get their name from the role they serve in the ecosystem. Namely, they make food or glucose from the conversion of light energy given off by the sun. These producers include plants like the one in the picture (Allium spp.) which is a relative to the wild leek (Allium tricoccum) found in Mississippi as well as many algae and bacteria. Producers contribute to the largest amount of energy and biomass to the ecosystem, and form the foundation of the food chain. In short, without producers or other autotrophic organisms we would starve! Slide 8: Consumers Consumers must rely on the energy generated by primary producers for their food. Herbivorous consumers are plant and fruit eaters. Carnivores eat other consumers while omnivores eat both plant (producers) and meat (other consumers). Because consumers use most of the energy they gain for cellular respiration, the amount of energy available for transfer between trophic levels decreases at each successive level of the food chain. Slide 9: Decomposers Decomposers, such as bacteria and fungi, are involved in the cycling of nutrients through the breakdown organic matter.
Approximate Word count = 1008
Approximate Pages = 4
(250 words per page double spaced)
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