کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2024745 1542615 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
How the chemotactic characteristics of bacteria can determine their population patterns
ترجمه فارسی عنوان
چگونگی ویژگی های شیمیایی باکتری ها می تواند الگوهای جمعیت آنها را تعیین کند
کلمات کلیدی
مدل شبکه پور تنوع فضایی، ناهمگونی در مقیاس پوسته، ساختار جامعه میکروبی، آمار زمین شناسی شیمی درمانی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش خاک شناسی
چکیده انگلیسی


• An individual-based model was developed and coupled to a pore-network model.
• The bacterial distribution patterns were geostatistically analyzed.
• The effects from bacterial chemotactic properties on bacterial distribution patterns were examined.
• The additional influences from structural heterogeneities were examined.

Spatial distribution of soil microorganisms is relevant for the functioning and performance of many ecosystem processes such as nutrient cycling or biodegradation of organic matters and contaminants. Beside the multitude of abiotic environmental factors controlling the distribution of microorganisms in soil systems, many microbial species exhibit chemotactic behavior by directing their movement along concentration gradients of nutrients or of chemoattractants produced by cells of their own kind. This chemotactic ability has been shown to promote the formation of complex distribution patterns even in the absence of environmental heterogeneities. Microbial population patterns in heterogeneous soil systems might be, hence, the result of the interplay between the heterogeneous environmental conditions and the microorganisms' intrinsic pattern formation capabilities.In this modeling study, we combined an individual-based modeling approach with a reactive pore-network model to investigate the formation of bacterial patterns in homogeneous and heterogeneous porous media. We investigated the influence of different bacterial chemotactic sensitivities (toward both substrate and bacteria) on bacterial distribution patterns. The emerging population patterns were classified with the support of a geostatistical approach, and the required conditions for the formation of any specific pattern were analyzed.Results showed that the chemotactic behavior of the bacteria leads to non-trivial population patterns even in the absence of environmental heterogeneities. The presence of structural pore scale heterogeneities had also an impact on bacterial distributions. For a range of chemotactic sensitivities, microorganisms tend to migrate preferably from larger pores toward smaller pores and the resulting distribution patterns thus resembled the heterogeneity of the pore space. The results clearly indicated that in a porous medium like soil the distribution of bacteria may not only be related to the external constraints but also to the chemotactic behavior of the bacterial cells.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil Biology and Biochemistry - Volume 69, February 2014, Pages 346–358
نویسندگان
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