Ent 104 Johnson Lecture Outline: Predation and Parasitism in Insects

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Which order consists of insects that are exclusively predatory?

Mantodea

Phasmatodea

Odonates (correct)

Neuropterans

What is a common characteristic of sit and wait predators?

They engage in active searches for prey.

They use traps to catch prey.

They are often fast-moving.

They are camouflaged. (correct)

How do parasitoids typically lay their eggs on or in their hosts?

By injecting them with venom

By sitting on top of the host until the egg hatches

By secreting chemicals to immobilize the host

By using specialized ovipositors (correct)

What is the main difference between traditional predators and parasitoids?

Parasitoids develop into larvae inside or on the host. Signup and view all the answers

Which development stage of a parasitoid kills the host?

Larva Signup and view all the answers

What is one way insects can prevent parasitoid encapsulation?

Melanizing immune cells to thicken them Signup and view all the answers

What is an exclusive or mostly parasitic species found in many orders?

Strepsiptera Signup and view all the answers

How do Strepsiptera females signal to flying males?

By releasing pheromones Signup and view all the answers

What is the unique behavior of Strepsiptera males during pupation?

They leave the host Signup and view all the answers

Why do females of Strepsiptera never pupate?

They remain as larva-like insects Signup and view all the answers

What is the main factor that drives army ants to move often?

Depletion of food supply Signup and view all the answers

What is the primary mode of communication among blind driver ants?

Pheromones Signup and view all the answers

Which type of ant has queens that are the largest of all ants?

Driver ants Signup and view all the answers

How do army ants forage for food when they dissolve their bivouac?

Foraging columns Signup and view all the answers

What is the predominant strategy employed by army ants while attacking social insect nests?

Swarming Signup and view all the answers

In what way do new queen ants contribute to colony growth?

By laying eggs Signup and view all the answers

What role do hyperparasitoids play in the ecosystem?

They help control pests by feeding on primary parasitoids. Signup and view all the answers

How do dipteran parasitoids differ from hymenopteran parasitoids in host finding?

Dipteran larvae sometimes have morphological modifications for host finding. Signup and view all the answers

What is the main method used by hymenopteran parasitoids to immobilize their hosts?

Using a stinger Signup and view all the answers

In what way do avoidance and suppression differ in relation to parasite-host interactions?

Avoidance hangout triggers encapsulation while suppression interferes with it. Signup and view all the answers

What distinguishes subversion from destruction in terms of host-parasitoid interactions?

Subversion is when the parasitoid is encapsulated but tolerates it, whereas destruction weakens the host. Signup and view all the answers

Why are hymenopteran and dipteran parasitoids considered important selective agents?

They are involved in evolutionary arms races with their hosts. Signup and view all the answers