Tenebrosa Abiotic Factor

longer periods of time compared to those living further down the shore as they risk longer periods of exposure time. Salinity is the salt concentration of the intertidal zone of the rocky shore. The A.Tenebrosa needs to keep its body salts at a constant level or else issues in the metabolism and other bodily functions can occur. The organism has to be able to adapt to low levels of salinity during times of high water flow after flooding or storm. And even during hot days causing water evaporation in the low tide zone leading to high levels of salinity. Another abiotic factor key to the A.tenebrosa is wave action. Wave action is the regularity and strength of the waves on the rocky shore. The A. tenebrosa must be able to withstand the force

If the A.tenebrosa was not able to withstand the strength of the ocean’s waves as they crash into the intertidal zone then the organism would be swept away with the tide off the rocks. The final abiotic factor that I wish to discuss effecting the actinia tenebrosa is light intensity. Light intensity caused from the sun has a large effect on this species. The A.tenebrosa, if exposed to high levels of light intensity, would dry out rather quickly due to the intensity of heat and light from the sun. To avoid this the A.tenebrosa lives under crevices, gullies or other rocks which are damp and usually shaded to avoid desiccation caused by the sunlight.

The A. tenebrosa is also impacted greatly by biotic factors. Biotic factors are environmental factors caused by living things in the rocky shore. Biotic factors tend to be responsible for the lower distribution of a species (how low in the intertidal zone it is able to live). There are a range of biotic factors that impact the organism A.tenebrosa however, competition, food supply and predators are a few very vital examples. Firstly competition, competition tends to occur at the rocky shore

Tenebrosa, factors caused by living things, known as biotic factors, also play a role in the distribution of P.Maculata. The first important biotic factor key in a P.maculata’s life is predators. As mentioned prior this organism is unable to move quickly in the water and like all organisms in the ocean is hunted as a means of food. As it cannot ‘outrun’ predators the organism, to deter predators, releases a unique toxin identified as tetrodotoxin. This toxin is extremely harmful and successfully enhances the survival of P.Maculata. Food supply is also a key biotic factor in the rocky shore. The P.Maculata are carnivores, feeding on sea anemones, bryzoanes and sponges. When there is a low concentration of food source in the zone the organism is washed up to the P.maculata will struggle for food. However, if there is a high concentration of P.Maculata in the surfaced zone,then the P.Maculata will compete against its own for food resulting in aggressive competition. The P.Maculata if presented with lack of food can also adapt to the situation and feast on other sea organisms or even others of its own species to survive if need