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Biotic and Abiotic Factors: Biofilm Illustration

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Olivia Pelletier

on 14 December 2012

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Transcript of Biotic and Abiotic Factors: Biofilm Illustration

Illustration of Biofilms and How They Connect to Biotic and Abiotic Factors Biofilms The affect of population, ecosystem, and community levels by biotic and abiotic factors:-ex. Water availability, availability of nesting materials and sites, species diversity, can all contribute to the stability of these groups. Water pollution has a huge impact on biotic and abiotic factors of the ecosystem. There are thousands of living organisms in the ocean. Some biotic factors that are affected by water pollution are aquatic food such as phyto- and zoo- plankton. If there is no aquatic food then there will be a decrease in whales, small fish, sea stars, and shrimp. If there is a decrease in aquatic food, then the population of the fish that eat that aquatic food will decrease. One other biotic factor that is affected by water pollution is the mortality of sea plants; which provides shelter for fish. These factors could be very dangerous for the ecosystem. Water Pollution and Abiotic Factors of the Ecosystem There are some nonliving factors that are affected by water pollution. One factor that is greatly affected by water pollution is the oxygen content. The oxygen content of the water can be reduced greatly if it is being polluted by an organic source, such as sewage. The amount of dissolved oxygen determines the number and types of organisms living in the body of water. Decay of organic material in water such as untreated sewage or dead vegetation can reduce dissolved oxygen concentration. Temperature is another abiotic factor that is affected by water pollution. If there was cooling water that entered some body of water, that water would act as a thermal pollutant and have an adverse effect on the numbers of that specific ecosystem. What is Biotic and Abiotic? Biotic factors are living and include plants, animals, fungi, protist, and bacteria.

Abiotic factors are non-living but affect living organisms; it includes habitats, weather, wind, season and water flow. Biotic and Abiotic factors combine and create a system from a whole population or ecosystem to systems in a human’s body. The system is affected by how well the living and non-living factors interact with each other and the organism. If a single factor is changed, the whole system will be altered. Abiotic and Biotic Factors in an Ecosystem Biotic and abiotic factors determine both where an organism can live and how much a population can grow. A limiting factor restricts the elements that biotic and abiotic factors determine.Abiotic factors, such as temperature, soil and light, can also influence an organisms’ success in an area. The tolerance of an organism is the abiotic conditions in which an organism can survive. At both ends of the tolerance range an organism is stressed. For example, plants have low tolerance when it comes to temperature. Water Pollution and Biotic Factors of the Ecosystem A biofilm is a complex aggregation of microorganisms on a solid substrate. Biofilms are characterized by structural heterogeneity, genetic diversity, complex community interactions, and extracellular matrix of polymeric substances. Biofilms begin with the attachment of free-floating microorganisms to a surface. It initially adheres to the surface through weak, reversible, Van Der Waals forces. If the microorganisms are not removed immediately from the surface, they anchor themselves more permanently using cell adhesion molecules such as pili. Bacteria living in a biofilm can have different properties from free-floating bacteria, as the dense and predicted environment of the film allows them to cooperate and interact in various ways. One benefit is the increased resistance to detergents and antibiotics, as the dense extracellular matrix and the outer layer of cells protect the interior community. Abiotic Resistance Biofilms on Teeth Abiotic resistance of bacteria in the biofilm mode of growth contributes to the chronicity if infections such as those associated with medical devices. Resistance seems to depend on multicellular strategies when it comes to biofilms. Bacteria living in a biofilm is much different than that of free-floating bacteria. One benefit of this environment is increased resistance to detergents and antibiotics, as the dense extracellular matrix and the outer layer of the cells protect the interior of the community. Periodontitis and caries are infectious diseases of the oral cavity in which biofilms play a role. Oral biofilms are model systems for bacterial adhesion, biofilm development, and biofilm resistance to antibiotics.
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