Rocky Shore Investigation
Null Hypothesis:
There is no pattern to the distribution of organisms over a rocky
shore.
Variables:
Factors that affect the distribution of organisms over an area of
shoreline are:
· The depth of water which may cover an organism at high tide.
· How resistant an organism in the littoral zone is to dessication.
· How efficiently an organism can conserve water.
· The proximity and availability of nutrition.
Stations
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I think that stations 1 – 4 are in the sub-littoral zone of the rocky
shore.
Stations 5 – 12 are in the mid-littoral zone.
Stations 13 – 15 are in the splash zone.
I know this through observation on the day, the amount of rock pools
and their depth etc. Consequently the splash zone had no rock pools,
the mid-littoral zone had some, but these were not very deep, the
sub-littoral zone was very close to the sea and was almost all rock
pools with lots of slippery seaweed. My results show that this was
mainly Fucus vesiculosus (Bladdder Wrack).
Analysis of Results:
====================
Animals
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There are several clear trends in my results, the clearest of these
being the limpet (Patella vulgata). The majority of limpets were
situated mainly in the mid-littoral zone and splash zone. They had a
peak at station 12 of 31 limpets. Their number slowly built up to this
peak from 1 limpet at station 4 to 33 limpets at station 12. The
limpets also petered out in numbers after station 12, to go 13 to 6 to
0. This tells me that they do not want to be exposed for that long
between tides. However, station 12 still has a ...
... middle of paper ...
...rocky shore. We could have done this by placing two
measuring poles at the required points on the beach and then using a
field level device, such as an Abney level, which consists of a
sighting device and a spirit level. This would have produced two
heights which when subtracted from eachother would have produced
height increase.
We could also have improved the investigation by checking more
thoroughly in the quadrats and by spending more time learning what the
species subtle differences were.
We could have ensured that the groups we took data from for the
averages had spent a decent amount of time on the investigation and
had not rushed it.
There were many aspects of the investigation that could have flawed
the results however overall I think that the practical still reliably
rejected my null hypothesis.
Marshak, S. (2009) Essentials of Geology, 3rd ed. New York: W.W. Norton & Company, ch. 11, p. 298-320.
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