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Field trip report Mangrove ecosystem

Extracts from this document...


Contents I. Aims and objective of study. Page 1 II. Introduction Page 3 III. General information of the field trip..........................Page 4 IV. Method of study......................................................... Page 5 V. Abiotic factors in Sai Keng........................................Page 9 VI. Analysis of the results obtained................................Page 12 VII. Problems of life in mangrove Page 20 VIII. Adaptations of plants to mangrove ........................... Page 22 IX. Adaptations of animals to mangrove ......................Page 25 X. Biotic factors in Sai Keng........................................Page 27 XI. Food web and dichotomous key of mangrove.........Page 29 XII. Man's impact on mangrove habitat ..........................Page 30 XIII. Conservation of Mangroves in Hong Kong...............Page 31 XIV. Safety precaution......................................................Page 32 XV. Comment & conclusion.............................................Page 33 XIV. Title A study of the mangrove ecosystem (Sai Keng) I. Aims 1. To understand the structure and functioning of a mangrove ecosystem. 2. To learn and practice basic ecological techniques. 3. To manipulate simple field equipment so as to measure environmental factors. 4. To identify the common mangrove organisms. 5. To identify and interpret adaptive features pertain to the mangrove plants and animals. Objectives 1. To identify animals and plants with the aid of keys and field guides. 2. 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. 3. To find out the aspect of the habit by means of a compass. 4. To determine the slope of the beach by means of the levelling technique making use of two ranging poles, a piece of cotton thread and a spirit level. 5. To collect soil and soil water samples. 6. To measure pH of the soil water on the spot. 7. To capture burrowing animals in the mud. 8. To sample the mangrove animals and plants by means of a transect line and a quadrat. 9. To carry ort routine soil analysis in the laboratory. 10. To construct a profile chart of the habitat along the transect line showing changes in altitude and slope on the beach, soil composition, soil water content and pH, and distribution of plant and animal species. ...read more.


v. Fulvia sp.: It is common on muddy bottom and in low or shallow waters. Its calcareous shell prevents it from desiccation and provides protection. Fulvia sp. ? Phylum: Mollusca Class: Bivalvia Order: Veneroida Family: Cardiidae vi. Mictyris longicarpus (monk crab / soldier crab): It is very common on mud flat and sandy shore. Its carapace is spherical and powder blue at the back. Its legs are white and capable of digging down the sand. Mictyris longicarpus ?? Phylum: Arthropoda Class: Crusacea Order: Decapoda Family: Mictyridae vii. Uca vocans vocans Linnaeus (tidal crab): It is found on protected soft mud flats beyond the mangroves. Its large claw granulose is one of the main characteristics for distinction and its legs are dull yellow. Just like another Uca species, male adult has one enlarged chela on one side. Uca vocans vocans Linnaeus ?? Phylum: Arthropoda Class: Crusacea Order: Decapoda Family: Ocypodidae viii. Periophthalmus cantonensis (mudskipper): It is very common on mudflat of mangrove swamps and on branches or twigs of mangrove trees. Its body is grey-brown with irregular markings. Its strong pectoral fins are well muscled to enable them to hop along the mud surface. Their eyes are large and elevated well above the head to have a greater field of vision for predation and escape. Their buccal cavity can traps water and gills can absorb oxygen from it. That is why it appears on the wet muddy soil although it belongs to Osteichthyes. Periophthalmus cantonensis ? Phylum: Chordata Class: Osteichthyes Order: Perciformes Family: Periophthalmidae VII. Problems of life in mangrove One of the major differences between mangrove habitats and the others is mangroves are covered with seawater periodically. The drastic physical factors make it a special habitat for plants and animals. Here are some of the problems they have to face with. 1. Anaerobic condition: Anaerobic condition is one of the common physical factors with the descending of slope gradient. ...read more.


That's why we grasped every second to do our research! Environment changes, as it always does. We cannot control the changes that occur naturally, but we can minimize the detrimental effects of human impact by living in a more environmentally friendly way. Conservation proves to be a difficult task in Hong Kong since the density of population is so high and the awareness of local residents is yet to be raised. It is high time for not only the government, but we also protect the valuable habitat and resources for a better place for human to live. We, our whole biology group, are looking forward to another visit... XVI. Conclusion The most noticeable thing about mangroves is the zonation of organisms. The particular species of organism in each zone may vary with different physical factors such as levels of tide and air exposure at different time intervals, but all show special adaptations to living in this area, and the basic structure is recognizable on most mangrove environments. Biology Field Trip Report--The Mangrove Habitat 2000 / 01 Page 2 I. Aims and Objective of Study Page 3 II. Introduction Page 4 III. General Information of the Field Trip Biology Field Trip Report--The Mangrove Habitat 2000 / 01 8 Page IV. Method of Study Page 9 V. Abiotic Factors in Sai Keng 11 Page V. Abiotic Factors in Sai Keng 19 Page VI. Analysis of the Results Obtained Biology Field Trip Report--The Mangrove Habitat 2000 / 01 21 Page VII. Problems of life in mangrove Biology Field Trip Report--The Mangrove 2000 / 01 24 Page VIII. Adaptations of Plants to Mangrove Biology Field Trip Report--The Mangrove 2000 / 01 26 Page IX. Adaptations of Animals to Mangrove Biology Field Trip Report--The Mangrove Habitat 2000 / 01 28 Page X. Biotic Factors in Sai Keng 29 Page XI. Food Web and Dichotomous Key of Mangrove 30 Page XII. Man's Impact on Mangrove Habitat 31 Page XIII. Conservation of Mangroves in Hong Kong 32 Page XIV. Safety Precautions -The End- XV; XVI. Comment & Conclusion ...read more.

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