Ch 2 - 1. What is the difference between the biotic...

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1. What is the difference between the biotic community and the abiotic environmental factors of an ecosystem? The biotic community is the living portion of the ecosystem—plants, animals and microbes—while the abiotic community is the non-living portion— chemical and physical factors. The abiotic factors support and limit that biotic community. The biotic community members influence each other and will contribute to the abiotic community (minerals, etc.) during decomposition. 2. Define and compare the terms species, population, association, and ecosystem. A species is all the organisms that “have a strong similarity in appearance to one another and which are distinct in appearance from other such groups.” “(T)he biological definition of a species is the entirety of a population that can interbreed and produce fertile offspring. . . .” A population is the “individuals that make up the interbreeding reproducing group” within a species. “(T)he distinction between population and species is that population refers only to those individuals of a certain species that live within a given area, whereas species is all inclusive, referring to all the individuals of a certain kind, even though they may exist in different populations in widely separated areas.” An association is the “plant community with a definite composition, uniform habitat characteristics, and uniform plant growth.” “(A)n ecosystem is a grouping of plants, animals, and microbes occupying an explicit unit of space and interacting with each other and their environment.” Individuals within a species make up a population; there can be more than one population of a species. An association is the plants found within an ecosystem. There can be more than one plant association within an ecosystem. 3. Compared with an ecosystem, what are an ecosystem, landscape, biome, and biosphere? An ecosystem is area between two (or more ecosystems) where many of the species and characteristics of the adjacent ecosystems are found plus some “unique conditions that support distinctive plant and animals species.” A landscape is a group of interacting ecosystems. Landscapes acknowledge that ecosystems impact each other. Biomes are “similar or related ecosystems or landscapes . . . often grouped together to form major kinds of ecosystems.” The biosphere is all the ecosystems of the Earth combined. 4. Identify and describe the biotic and the abiotic components of the biome of the region in which you live.
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The answers to this question will vary. The description should include the ecosystem type, (e.g., desert, prairie grassland, temperate deciduous forest, coniferous forest, etc.) and a description of the kinds of plants and animals found, the climatic conditions and seasons, (e.g. semi-arid, rainy/dry
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This note was uploaded on 10/08/2008 for the course EMERITUS O 101 taught by Professor Richardtwright during the Spring '08 term at Gordon MA.

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Ch 2 - 1. What is the difference between the biotic...

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