Waves can hit the intertidal ..
The mid-shore zone is also a particularly harsh place for organisms to survive. High wave action can dislodge marine organisms in this zone and transport them either lower down or higher up the shore, which could in effect place the organism in a less adaptable habitat for that particular creature and therefore cause reproductive/feeding or migratory problems. However species living on the mid shore have an added benefit of not being dried out too severely even in high temperatures, compared to species situated on the high shore, due to the incoming tides submerging them again ever few hours . This is a huge advantage for mid shore species and is a possible reason as to why the mid shore is such a highly diverse area of any shore for algal species, when compared with other zones. This investigation looked to assess the relationship between rock pool area and species diversity, on the mid-intertidal zone of a rocky shore, taking all these factors in to account to finalise whether rock pool area is the only relevant factor of total species diversity on rocky shores around the coast of the British Isles.
Different organisms able to withstand different degrees of ..
Addressing the study’s main hypothesis, the comparison of species diversity with rock pool area on the mid-intertidal zone of a rocky shore, showed a weak yet positive correlation. This being said the analysis of data showed that there was no significant difference between the two variables, as the P value was higher than 0.05, resulting in the null hypothesis being accepted. The data shows that, at first, the slight increase of pool area did appear to make an impact on the amount of algal species found in the pools. However as Figure 1 shows, the trend then declines and species diversity does not exceed 9 different species within any one pool. The presence of 9 species in one rock pool is likely to suggest increased competition for food, light and space which could in turn be the reason why there is no greater species diversity than 9 species in any one pool. However it would not be unfathomable for future hypotheses’ to predict the opposite of the study’s findings, suggesting smaller rock pools, with high diversity of algae, would provide increased competition for light, food and space (due to the reduced pool area and increased population).
In contrast, from the point of view of organisms using photosynthesis, such as and , detritus reduces the transparency of the water and gets in the way of their photosynthesis. However, given that they also require a supply of nutrient salts, in other words for photosynthesis, their relationship with detritus is a complex one.
Temperature affects the organisms in the photic zone
Rock pools are a well known feature of many rocky shores although theirecology is less well understood than that of bedrock (see Chapter VII). Pools provide anintertidal habitat for obligate water dwellers including many species of fishes. They alsosupport low-shore organisms, such as seaweeds and anemones, at higher levels than theywould otherwise be found. However, those pools at higher shore levels are subject tophysical and chemical fluctuations which would not be experienced in the sea (Morris andTaylor, 1982). Pools at about the level of neap tide high water will be separated from thesea for continual periods of about 11 hours. Higher up the shore, pools experience severaldays without inundation (Naylor and Slinn, 1958). Temperatures in these small bodies ofwater change in response to air temperatures more rapidly than those in the sea. Waterevaporates from pools and rainwater and freshwater runoff collects in them, causingsalinity fluctuations. Fluctuations in oxygen content and pH also occur with a diurnalcycle. During the daytime, plants photosynthesise, saturating the water with oxygen andsupersaturation is not uncommon. During the night, a net uptake of oxygen and productionof carbon dioxide occurs. Oxygen concentration drops and pH falls as a result.
However they are able to adjust to a certain extent.
Dead plants or animals, material derived from animal tissues (such as skin cast off during moulting and excreta) gradually lose their form, due to both physical processes and the action of , including grazers, and . , the process through which organic matter is decomposed, takes place in many stages. Materials like , and with low are rapidly consumed and absorbed by micro-organisms and organisms that feed on dead matter. Other compounds, such as are broken down more slowly. In addition, the purpose of the various micro-organisms involved is not to break down these materials but to use them to gain the resources they require for their own survival and proliferation, and they are merely breaking them down as part of that process. Accordingly, at the same time that the materials of plants and animals are being broken down, the materials () making up the bodies of the micro-organisms are built up by a process of . When micro-organisms die, fine organic particles are produced, and if these are eaten by small animals which feed on micro-organisms, they will collect inside the , and change shape into large pellets of dung. As a result of this process, most of the materials from dead organisms disappears from view and is not obviously present in any recognisable form, but is in fact present in the form of a combination of fine organic particles and the organisms using them as . This combination is detritus.
What Are Rocky Shores? Essay - 644 Words - StudyMode
FI and other parts of the intertidal wetland area of Moreton Bay/Quandamooka have been significant habitat sites for many bird species, local and migratory. However, in recent years there has been significant loss of roosting habitat as a result of foreshore residential development and that associated with the seaport and airport. Disturbance has been considerable. Large, important roosting sites have either been fragmented (Driscoll 1992) or lost altogether. In response, artificial roosts are being constructed to replace some that have been lost to developments such as Raby Bay ( 1998, p. 12).