Parasitoids and parasites

Parasitoids and parasites - Parasites and parasitoids How...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
Parasites and parasitoids How do parasites or parasitoids influence the behavior of their hosts in ways that are beneficial to the parasites? Parasitoids are insects (usually wasps) whose larvae infect another insect.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Ampulex compressa , the jeweled wasp: a parasitoid, cockroach-hunting wasp. http://www.dkimages.com/discover/previews/744/35001386.JPG
Background image of page 2
Ampulex compressa , the jeweled wasp: a parasitoid, cockroach-hunting wasp. http://www.dkimages.com/discover/previews/744/35001386.JPG
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Ampulex seeks out cockroaches, lays eggs in them…… http://www.dkimages.com/discover/previews/936/90001666.JPG
Background image of page 4
Finally, the young wasps emerge from the roach’s body. http://3quarksdaily.blogs.com/3quarksdaily/images/ampulex20emerging.jpg
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
http://tw.youtube.com/watch?v=9fO0zHiAIG8&feature=related
Background image of page 6
The first sting is to the thorax: this causes transient paralysis of the front legs. Haspel & Libersat., 2003b
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Wasp injecting venom into a roach’s brain http://scienceblogs.com/loom/uploads/Ampulex%20stinging.jpg
Background image of page 8
The parasitic wasp stings its prey (a cockroach) in the head, placing its stinger in its brain Haspel et al., 2003a
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Wasps were injected with radioactive amino acids which were incorporated in their venom. Wasps stung roaches and the roaches’ heads were dissected. Radioactivity was localized to the brain and the SEG. When radioactive venom was injected into the cockroach’s head with a syringe (a control), it was found in the non-neuronal tissue, not the brain. Wasps inject venom directly in the roach’s brain SEG = subesophageal ganglion
Background image of page 10
Wasps were injected with radioactive amino acids which were incorporated in their venom. Wasps stung roaches and the roaches’ heads were dissected. Radioactivity was localized to the brain and the SEG. When radioactive venom was injected into the cockroach’s head with a syringe (a control), it was found in the non-neuronal tissue, not the brain. Wasps inject venom directly into neural tissue SEG = subesophageal ganglion
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Venom transiently blocks all electrical activity in the thoracic ganglion Injection of venom into the second thoracic ganglion blocks all spontaneous or evoked firing for a few minutes. Haspel & Libersat., 2003b
Background image of page 12
Transient paralysis is due to the block of a cholinergic synapse onto leg motor neurons Venom blocks action potentials induced by stimulation of cholinergic inputs onto motor neurons, but not antidromically- activated (backwards propagated) action potentials.
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/28/2012 for the course BIO 49593 taught by Professor Wanser during the Spring '10 term at University of Texas.

Page1 / 50

Parasitoids and parasites - Parasites and parasitoids How...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online