2. Practical : Demonstration and applicability of basic equipment needed for wildlife studies (Compass).
A. Compass
Aim:
To study the structure, working principle, and applications of a compass used in wildlife field studies for determining direction and navigation.
Principle
A compass is a simple navigational instrument used to determine directions such as north, south, east, and west. It is one of the most basic and reliable tools used in wildlife surveys, forest exploration, and ecological fieldwork.
In wildlife research, accurate knowledge of direction is essential for mapping study areas, conducting transect surveys, and navigating through forests. A compass helps researchers orient themselves and maintain the correct direction while collecting field data.
Working Principle
A compass works based on the Earth’s magnetic field. The instrument contains a magnetized needle that is free to rotate on a pivot. Since the Earth behaves like a large magnet, the magnetized needle aligns itself with the magnetic north–south direction.
a. The north-seeking end of the needle points toward the Earth's magnetic north pole.
b. The compass dial is marked with directions and degrees (0°–360°).
c. By observing the needle position relative to these markings, the user can determine the direction of travel.
This allows researchers to identify directions and maintain a consistent path during field surveys.
Parts of a Compass
A typical field compass consists of the following parts:
Magnetic Needle – A magnetized needle that aligns with the Earth's magnetic field.
Compass Dial – Circular scale marked with directions and degrees.
Pivot Point – Allows the needle to rotate freely.
Base Plate – Transparent base used for map reading.
Direction-of-Travel Arrow – Indicates the direction in which the user should move.
Materials / Equipment Required
1. Compass
2. Field notebook
3. Map of the study area (optional)
4. Marker or flag for marking transects
Procedure for Using a Compass
1. Hold the compass flat and steady in the palm of your hand.
2. Allow the magnetic needle to move freely and settle.
3. Identify the direction of magnetic north indicated by the needle.
4. Rotate the compass dial until the north mark aligns with the needle.
Determine the desired direction of movement.
1. Follow the direction indicated by the direction-of-travel arrow.
2. Record the direction and location in the field notebook.
Observation / Data Recording Format
Sl. No | Location | Direction Observed | Remarks |
1 | Forest edge | North-East |
|
2 | River bank | South |
|
3 | Grassland | West |
|
Result
The compass was successfully used to determine directions and navigate through the study area during field observations.
Uses in Wildlife Studies
1. Navigation in Forest Areas
A compass helps researchers navigate through forests, grasslands, and other wildlife habitats where landmarks may not be clearly visible.
During wildlife surveys, scientists establish transect lines to observe animals or vegetation. A compass ensures that transects are laid out in accurate and consistent directions, which improves the reliability of ecological data.
Compasses are also used with maps to determine location, orientation, and landscape features in wildlife habitats.
Advantages
1. Simple and easy to use
2. Lightweight and portable
3. Does not require batteries or electricity
4. Reliable under most field conditions
Limitations
1. Magnetic materials such as metal objects, vehicles, or electronic devices can interfere with the magnetic needle.
2. Provides magnetic north, which may differ slightly from true north.
3. Accuracy may decrease if the compass is not held steady.
Precautions
1. Hold the compass away from metal objects or electronic devices.
2. Keep the compass horizontal while reading directions.
3. Ensure the needle moves freely before taking a reading.
4. Handle the instrument carefully to avoid damage.
Applications in Wildlife Conservation
1. Compasses are widely used in: Wildlife population surveys, Forest mapping, Habitat monitoring, Ecological field studies, Conservation research.
They help researchers navigate efficiently and collect accurate spatial data in wildlife habitats.
Viva Voce Questions
1. What is a compass?
2. On which principle does a compass work?
3. Why is a compass important in wildlife field studies?
4. What is the difference between magnetic north and true north?
5. What factors can affect the accuracy of a compass?
References
1. Bookhout, T. A. (1996). Research and Management Techniques for Wildlife and Habitats (5th Edition). The Wildlife Society, Bethesda, Maryland.
2. Sutherland, W. J. (2006). Ecological Census Techniques: A Handbook (2nd Edition). Cambridge University Press, Cambridge.
3. Bibby, C. J., Burgess, N. D., Hill, D. A., & Mustoe, S. H. (2000). Bird Census Techniques (2nd Edition). Academic Press, London.
4. Krebs, C. J. (2014). Ecology: The Experimental Analysis of Distribution and Abundance (6th Edition). Pearson Education, New York.
5. Primack, R. B. (2014). Essentials of Conservation Biology (6th Edition). Sinauer Associates, Sunderland, Massachusetts.
6. Sutherland, W. J., Newton, I., & Green, R. E. (2004). Bird Ecology and Conservation: A Handbook of Techniques. Oxford University Press, Oxford.
Odum, E. P., & Barrett, G. W. (2005). Fundamentals of Ecology (5th Edition). Brooks/Cole, USA.
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