Abiotic Factors – Water Conditions
Disturbance on a still water
Evidently, the light and heat from the sun play an important role in providing suitable conditions. However, the water conditions also inevitably have an effect on life in the ecosystem.
A still body of water will inevitably be disturbed by various factors, which will affect the distribution of organisms in the water. Wind is considered to be the prime factor responsible for disturbing water, though changes in temperature can create convection currents where temperature is evened out across the body of water via this movement.
Naturally, a river will have water movement as water succumbs to gravity and moves downstream. These are relatively constant factors that affect water movement though, for example, human intervention can also cause water movement. The surface tension of the water will also affect the organisms that occupy the area, depending on the cohesion of water at the surface, it can affect the amount of oxygen that reaches organisms living below the water surface.
These factors all affect the way of life for organisms occupying such a freshwater ecosystem. On a more molecular level, the chemical compositions of the water, soil and surrounding air also play a part in determining the face of the ecosystem.
The oxygen concentration of the water and the surrounding air will have great bearing on which organisms can survive in a particular environment. Oxygen is required for aerobic respiration in animals, and the concentration of oxygen in an area is determined by many factors, including temperature and abundance of organisms for example.
Many chemical reactions and cellular processes rely on the availability of oxygen, therefore the concentration of oxygen in the ecosystem will inevitably alter the ecosystem itself. The same applies to carbon dioxide concentration. CO2 is required for photosynthesis, and can also affect the pH of the water for example.
As you can see, many factors will affect the overall existence of organisms in an ecosystem. The chemical and physical characteristics, to begin with, will determine which organisms are most likely to survive in the freshwater ecosystem. In turn, these pioneers entering the environment will actively manipulate these factors and change the schematics of the ecosystem as a whole, meaning that they also play a part in determining which organisms will succeed in a particular environment.
The study of ecology in freshwater is usually divided into 2 categories, lentic (still) and lotic (running) water. These two bodies of water also have a bearing on which organisms are likely to occupy the area. The succeeding tutorials will separate these two categories of freshwater and investigate how they affect the life which lives in them.
You will also like...
Pollution in Freshwater Ecosystems
There are many environmental factors that arise due to the usage of water in one way or another and for every action tha..
Darwin and Natural Selection
This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..
Vascular Plants: Ferns and Relatives
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Still Water Community Plants
This tutorial looks at the adaptations of freshwater plants for them to thrive in still water habitats. Familiarize your..
Genetic Information and Protein Synthesis
Genes are expressed through the process of protein synthesis. This elaborate tutorial provides an in-depth review of the..
Ecological Research: Measuring & Analysis
This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..