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Biology field trip - A study of rocky shore ecosystem

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Introduction

Title A study of rocky shore ecosystem Aims 1. To understand the structure and functioning of a rocky shore ecosystem. Objectives 1. To measure climatic factors by means of an environmental comparator with a light probe, a whirling hygrometer, a hand-held wind meter, and a thermometer; 2. To measure pH of sea water on the spot; 3. To sample shore animals by means of a transect line and a quadrant; Introduction In this field trip report, Shek O, located in the north-east part of Hong Kong, is chosen as the place for our ecological study because rocky shores there are quite easy to access to and have a wide range of marine organisms. The best time to explore a rocky shore is at low tide, when there is a fairly calm sea, so as to avoid those sudden big waves. ...read more.

Middle

The reservoir of the hydrometer was fully filled with water and was stoppered. 2. The relative humidity was determined by finding the difference of temperature of the two bulbs and then read off from a special scale provided To determine the wind speed. 1. The wind speed was taken where the plastic ball reached maximum height. pH of sea water. 1. The colour change was compared with a standard scale to find out the pH value. Results A table showing the abiotic factors of the rocky shore at Shek O factors Details Temperature 20 ? Wind speed 14:50 < 2mph 15:10 =5mph Weather Rainy and cloudy PHI of the sea water About 5-7 Discussion Principles of the methods used in the procedures. The whirling hydrowind meter As the wet bulb is always filled with water, when water evaporates during the whirling action, the temperature on the bulb is lowered and it is lower than the dry-bulbed one. ...read more.

Conclusion

Chitons Chitons cling to rocks by using suction. Their calcareous shell is so hard and strong that are hard to be removed from the rocks. This not only prevents them from being washed away by strong tidal actions but also makes them harder to be a prey of predators. They are mostly herbivores and eat tiny plants (algae) which they scrape off rocks with their rasping tongue or radula Crab A crab shell is called a carapace and it protects its soft body from predators. Its large claws are used for catching and killing prey. Conclusion The most noticeable thing about rocky shores is the zonation of organisms. This is common to rocky shores all over the world. The particular species of organism in each zone may vary with different climates and levels of wave and air exposure, but all show special adaptations to living in this area, and the basic structure is recognisable on most rocky shore environments. ?? ?? ?? ?? ...read more.

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