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Behavior persistence in defining threshold switch in stepwise response of aquatic organisms exposed to toxic chemicals
- Source :
- Chemosphere. 165
- Publication Year :
- 2016
-
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 (Bt) of organisms consists of two types in behavior tendency, intoxication (Bp) and normal/recovery behavior (Bn). Both Bp and Bn 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 (Ti). The results suggested stress constant λ was decided by the constant rates gnE,gpE, an and ap. Due to different stress constant λ, the behavior responses of indicators showed great difference in different M, which included 'safe mode' (Ms), 'acclimation mode' (Mac), 'adjustment mode' (Maj) and 'toxic effect' (Mte). Usually, Bt during Ms could maintain around 0.8, and Mte would happen once it is lower than 0.2. According to the relationship between Bt values and E changes in 7 Majs, 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.
- Subjects :
- 0301 basic medicine
Aquatic Organisms
Environmental Engineering
Health, Toxicology and Mutagenesis
010501 environmental sciences
Biology
01 natural sciences
Environmental stress
Acclimatization
Aquatic organisms
Persistence (computer science)
03 medical and health sciences
Toxicity Tests
Environmental Chemistry
Animals
0105 earth and related environmental sciences
Genetics
Bacteria
Ecology
Public Health, Environmental and Occupational Health
General Medicine
General Chemistry
Models, Theoretical
Pollution
030104 developmental biology
Constant (mathematics)
Algorithms
Water Pollutants, Chemical
Bacterial colony
Subjects
Details
- ISSN :
- 18791298
- Volume :
- 165
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....13f8bb2c03fdb835db7f9b40a4360cc9