Essay about Ecobeaker1

714 Words Feb 25th, 2014 3 Pages
Exercise 1:
3.1 – Which barnacle species ranges into the warmest water? Chthamalus montagui
4.1 – On average, how many high and low tides will a given spot on the coast experience in a day, and why? A given spot on the coast will experience two high and two low tides each day. High tide occurs when the Moon and Earth are facing towards each other and away from each other. Low tide occurs when the Moon is facing the Earth at 90˚ and 270˚.
4.2 – What is spring tide and when does it occur? Spring tide is when the Earth, Moon and Sun are directly aligned. This occurs at new moon and full moon. The gravitational forces caused by the Sun are parallel to those of the moon. This creates a very high tide and a very low tide. This
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7.4 – During approximately which days in the 14-day tide cycle do organisms living on the upper part of the rock face their greatest potential exposure to air? Explain. At day 11 the organisms that are at the highest part of the rock experience the greatest exposure to air because the tide does not get as high during neap tides.
8.1 – Briefly describe what you notice about the distribution patterns for each species on the following days. Do both species settle on the same parts of the rock face? Do their distribution patterns of the rock face change over time?
Days 1-7:
The species randomly settle throughout the rock. Both species are settled at the bottom and top. They settle on same parts of the rocks as the other species did. There is more of an abundance of the Chthamalus than the Semibalanus. On day 28: On day 28 there is a large abundance of both species however, they have established the area in which they will settle. The Semibalanus have a large abundance between 0-2 m and scattered abundance above that height. The Chthamalus have a large but more scattered abundance between 2-5 m.
General Observations: Between day 8 and day 14 the Semibalanus start settle lower on the rock and there are none above 4 m. The Semibalanus start to settle mostly between 0-2 m and few Chthamalus are settling in that range. This occurs during neap tides. After day 14 the spring tide occurs and some

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