Question

which method to determine population size is the least invasive?
a. mark/recapture
b. direct observation
c. sampling
d. indirect observation

please select the best answer from the choices provided

a
b
c
d

Explanation:

🆕 New Concept Discovered: Methods of Estimating Population Size
Measuring populations without disrupting wildlife.

Step 1: Understand the concept of invasiveness

In ecology, "invasive" refers to how much a method disrupts, handles, or stresses the organisms being studied. A non-invasive or least invasive method avoids physical contact, capture, or direct disturbance of the animals in their natural habitat.

Step 2: Evaluate the given options

• a. mark/recapture: Highly invasive. It requires physically capturing animals, marking them (with tags, paint, or bands), releasing them, and capturing them again.
• b. direct observation: Moderately invasive. Researchers must look directly at the animals, which can alter their natural behavior or cause stress due to human presence.
• c. sampling: Can vary, but often involves capturing, collecting, or closely interacting with organisms within a specific quadrant or plot.
• d. indirect observation: Least invasive. This method estimates population size by looking for signs left behind by the organisms (such as nests, tracks, burrows, or droppings) rather than interacting with or observing the animals themselves. This causes zero direct disturbance to the animals.

Step 3: Select the best option

Since indirect observation does not require seeing, disturbing, or handling the organisms, it is the least invasive method.

Answer:

D