Behavior persistence in defining threshold switch in stepwise response of aquatic organisms exposed to toxic chemicals. (December 2016)

• Record Type: Journal Article
• Authors: Ren, Zongming; Li, Shangge; Zhang, Tingting; Qi, Luhuizi; Xing, Na; Yu, Huimin; Jian, Jinfeng; Chon, Tae-Soo; Tang, Bo
• Is Part Of: Chemosphere. Volume 165(2016)
• Page Start: 409
• Page End: 417
• Publication Date: 2016-12
• Subjects: Homeostasis -- Persistence model -- Stepwise behavior response -- Environmental stress -- Behavior strength; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2016.09.065
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: As a characteristic in bacterial colony, persistence model described the dynamics of two subpopulations (normal ( n ) and persister ( p )). In order to illustrate the switch of "Threshold" in the stepwise behavior responses of organisms, it is hypothesized that total behavior ( B t ) of organisms consists of two types in behavior tendency, intoxication ( B p ) and normal/recovery behavior ( B n ). Both B p and B n could be concurrently affected by environmental stress E, and behavior response modes ( M ) are decided by the relationship between E and toxicity threshold of test organisms ( T i ). The results suggested stress constant λ was decided by the constant rates g nE, g pE, a n and a p . Due to different stress constant λ, the behavior responses of indicators showed great difference in different M, which included 'safe mode' ( M s ), 'acclimation mode' ( M ac ), 'adjustment mode' ( M aj ) and 'toxic effect' ( M te ). Usually, B t during M s could maintain around 0.8, and M te would happen once it is lower than 0.2. According to the relationship between B t values and E changes in 7 M aj s, behavior persistence relying on adjustment could reflect the behavior homeostasis of organisms under environmental stress and be regarded as a threshold switch for the stepwise behavior responses. The mathematical analysis of behavior persistence allows making a quantitative prediction on environment assessment that would promote the emergence of persistence, as well as evaluating its ecological implications. Graphical abstract: Highlights: Mathematical behavior persistence construction inspired by bacteria persistence model. Defining threshold switch according to behavior modes. Homeostatic mechanics in explaining the mathematical behavior persistence model.