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Find out the relationship between the districution of bladders and the degree of exposure on the shore of bladder wrack seaweed

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Find out the relationship between the distribution of bladders and the degree of exposure on the shore of bladderwrack seaweed Aim To find out the relationship between the distribution of bladders and the degree of exposure on the shore of bladderwrack seaweed. Background Knowledge A rocky shore consists of small ledges, pools of water and plentiful amounts of pebbles and rocks. Along the seashore we have these different zones: ? The Upper shore ? The Middle shore ? The Lower shore ? The Sub lateral Sea Fringe Each of these parts of the shore have different miniature habitats, different species growth, within these habitats we have what we call a community of hardy plants and animals, these react with the area around them thus making the Seashore Ecosystem. The sheltered shore would typically have more habitats and species growing and living within it, rocky shore species are needed to be able to survive the continual changes and cycles of the tides. Seashore life occurs in zones on the shore as mentioned before, according to how tolerant different species are of exposure to air and sunlight. ...read more.


The absorption of water and nutrients as needed is done by osmosis within the fronds; this is the lower pressure of water potential acting on the salt and nutrient intake. Competition of the bladderwrack occurs mainly under more sheltered conditions because the main competitor is knotted Wrack (Ascophyllum nodosum), this is unable to survive in wave action, both the knotted Wrack and the bladderwrack habitat on the middle shore. Because bladderwrack only lives for about three years the knotted Wrack then takes over when the bladderwrack dies, and the knotted Wrack can live for about twenty years. The knotted Wrack is very familiar to the bladder wrack, despite some visual differences, such as the fronds on the knotted Wrack are much longer, but thinner, the gas filled vesicles on the knotted Wrack are not particularly in pairs they are at regular intervals and the knotted Wrack grows much slower than bladder wrack. The knotted wrack is found mostly on sheltered sites on shores in the mid-littoral where it can become dominant species in the littoral Hypothesis There will be more bladders on the seaweed that is more exposed because the seaweed will need to sustain positioning and staying afloat more, if in these conditions, because the seaweed needs to photosynthesise. ...read more.


6. I will repeat steps 4 and 5 until I have obtained all 30 samples. 7. I will then repeat this in a less exposed area of the island. I will repeat steps 1-6 in the less exposed area. Fair Testing Because I cannot control some of the variables, I will have to analyse the effects of them, and discuss this within my analysis, some such as the amount of times I throw the quadrat I can control, this being 30 times on the exposed side and 30 times on the less exposed side. I am doing this as it is plentiful to prevent problems that could arise when using a smaller number of samples; also this would come in extremely useful when I am doing the statistical work, as the statistical system I am using would be easier with this high number of samples. In my method I am accounting such things as the pH, periwinkles and the air and soil temperature because these could have direct effects on the growth and survival of the bladderwrack seaweed, this also means that I can analyse the results further using the measurements from this and draw more acute conclusions and perhaps solve some problematic results. ...read more.

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Here's what a teacher thought of this essay

4 star(s)

This is a good start to a report.
1. The report has a good structure and uses subheadings well.
2. The variables section should be expanded.
3. There needs to be a system in place to indicate which information has come from which source.

Marked by teacher Luke Smithen 23/07/2013

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