Biology 1001A Lecture Notes - Biocoenosis, Sound Energy, Chemical Energy

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azurehornet978

18 Oct 2012

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Always more energy available at lower trophic levels: larger population sizes at lower levels, biomass is also larger at lower levels. Community: all of the organisms living in some defined space. Ecosystem: a biotic community and it"s abiotic environment functioning as a system. Ecosystems are open, not closed systems: energy inputs and outputs. Heat, chemical, sound energy outputs: nutrient inputs and outputs. Streams coming into the lake is a source of input nutrients. Down flow stream is a way for nutrients to leave a system. 2 major activities in ecosystems: production & consumption. Production: new biomass is being created from inorganic substances. Consumption: current biomass is being converted into new forms of biomass (diagram) 99% of it comes from light energy (i. e. photosynthesis), harvest by photoautotroph. Chemical energy, harvested by chemoautotroph: rely on chemical energy, area"s where sun doesn"t shine. Chemical elements or compounds needed for growth or reproduction: organic or inorganic. Organic contains carbon: micronutrients & macronutrients.

Related Questions

why do nutrients cycle within an ecosystem while energy flows

scarletporpoise715

Energy pyramids, which display graphically the relative amounts of energy in each trophic level of an ecosystem, are very similar across a wide range of different ecosystems, but biomass and organism abundance at different trophic levels are more variable between different ecosystems.

yes or no

Which of the following is NOT one of the uses of fungi?

Select one:

a. As a source of antibiotics.

b. To make drinks, like beer.

c. To produce fabrics like cotton and linen.

d. To make food, like bread.

e. As a direct food source: mushrooms, for example.

How do fungi get nutrients?

Select one:

a. They ingest organic material, break it down internally, and absorb the released nutrients through their digestive system.

b. Fungi use each of these methods to get nutrients.

c. They secrete enzymes that break down dead matter or living organisms and absorb the released nutrients.

d. They receive nutrients from other organisms that trade the nutrients for protection from pathogens.

e. They produce their own by photosynthesis.

Why is fungi's role as biodegraders so important to ecosystems?

Select one:

a. It transfers the energy from sunlight into sugars.

b. It provides nutrients and oxygen to the ecosystem.

c. It protects plants from harmful viruses and bacteria.

d. It keeps the level of prey animals down so they do not overwhelm the ecosystem.

e. It recycles and reuses organic molecules so they are not wasted.

Biology 1001A Lecture Notes - Biocoenosis, Sound Energy, Chemical Energy

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