Methylation of inorganic mercury can occur via biotic and abiotic pathways. In traditional agricultural systems, tilling disturbs the soil ecosystem, affecting biotic and abiotic factors. This species dietary nutritional intake can vary depending on both abiotic and biotic factors. Nutrient cycling is the movement of nutrients through an ecosystem by biotic and abiotic processes. These biotic and abiotic components are linked together through nutrient cycles and energy flows. Wallace believed species were dynamic by responding to biotic and abiotic factors. These disasters could be biotic or abiotic. Competition is one of many interacting biotic and abiotic factors that affect community structure. Competition is only one of many interacting biotic and abiotic factors that affect community structure. Phytosensors are genetically modified plants that can report the presence of biotic or abiotic contaminants. Plants are continuously exposed to a range of biotic and abiotic stresses. One can differentiate abiotic from biotic substance (biodegradation). From one year to another, ecosystems experience variation in their biotic and abiotic environments. Resources are classified as either biotic or abiotic on the basis of their origin. Diapause in the tropics is often initiated in response to biotic rather than abiotic components.