Study Area in DATR

The boundary area marked in Google map is shown below (Figure 1). Once you know the study area, mark them with grids and look out for different land-use classes as mentioned in Figure 2. Randomly pick up grids and also land-use based on the study objectives.

Figure 1. Dandeli Anshi Tiger Reserve boundary on Google map.

Figure 2. Grid marking and land-use in DATR.

Measuring Habitat Variables

1. Global Positioning System (GPS): This handheld device is used to determine the location of sampling - longitude, latitude and altitude, which can be marked on a map or satellite image.

2. Canopy cover: It is measured to know the amount of shade a place gets. Canopy cover is measured with densiometer. In densiometers, there are 24 grids on a circular convex disc, which are divided again visually into 4 each in each grid. One has to calculate how many of these grids are covered by canopy and multiply by 1.08. This provides the percent canopy cover.

   Densiometer
   Image source: http://www.state.sc.us/forest/densiometer.jpg

3. Temperature and relative humidity: Temperature and relative humidity are measured at 1m above the ground. If shade is not present, provide artificial shade. Measurements should not be taken in direct sunlight.
   
   

   Digital thermohygrometer
   Image source: http://www.jnrelectronics.net/images/products/thermohygrometer103cth.jpg

Handling Amphibians

Amphibians have to be handled with at most care and gentleness. There is no single method to catch and handle frogs. With experience in field and interest, one will master handling of frogs. Generally, catch the frogs from behind and hold them at their arm pits. Do not squeeze or over press the individuals. In abundance related studies, carry a wet zipped cloth bag or net bag, and place the caught individuals for later analysis. It is always a good practice to release the frogs back at the same place of collection, after the study.