What is a non-selective sampling method for immature mosquitoes?

What is a non-selective sampling method for immature mosquitoes?

• A. One pint dipper
• B. Ovibucket
• C. Ovitrap
• D. Gravid trap

Answer: (A)

Sampling immature mosquitoes means collecting the aquatic larval and pupal stages present in standing water. A non-selective method in this context is one that doesn’t target a specific species or life stage, but rather picks up whatever larvae and pupae are in the habitat. The one pint dipper does exactly that: you dip into the water and retrieve a sample containing any larvae or pupae present, across species and sizes, without relying on a particular behavioral cue or trap. Other devices are more selective for eggs or adults. Ovitraps and ovibuckets are used to collect eggs laid by container breeders, or the sites where mosquitoes lay eggs, not the immatures in the water. Gravid traps target gravid, egg-laying females to capture adults. So they don’t sample immature stages directly as the dipper does.

Sampling immature mosquitoes means collecting the aquatic larval and pupal stages present in standing water. A non-selective method in this context is one that doesn’t target a specific species or life stage, but rather picks up whatever larvae and pupae are in the habitat. The one pint dipper does exactly that: you dip into the water and retrieve a sample containing any larvae or pupae present, across species and sizes, without relying on a particular behavioral cue or trap.

Other devices are more selective for eggs or adults. Ovitraps and ovibuckets are used to collect eggs laid by container breeders, or the sites where mosquitoes lay eggs, not the immatures in the water. Gravid traps target gravid, egg-laying females to capture adults. So they don’t sample immature stages directly as the dipper does.