21ParSocInsects

21ParSocInsects - A n n o u n c e m e n ts • Exam 3- last...

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Unformatted text preview: A n n o u n c e m e n ts • Exam 3- last chance • Deadlines – Lab Quiz Monday May 12 – Insect collection May 14 (morning) – Field Journal May 14 (morning) – Lab notebook due at Final Exam D e f e n s e s a g a in s t p a r a s it is m • Behavior – Twitching- try to throw parasitoid off – Guarding- e.g. leaf cutter ants – Use chemical defense • Encapsulation – Host immune response • Recognizes foreign material as non-self • Hematocytes form and enclose parasite in capsule – Selection on parasite to avoid encapsulation E n c a p s u la tio n o f p a r a s ito id S te m b o r e r p a r a s ito id T o p : E n c a p s u la tio n c lu s te r a s v ie w e d f r o m o u ts id e o f h o s t. M id d le : H e a v ily e n c a p s u la te d p a r a s ito id e g g s a n d n o r m a l la r v a e d is s e c te d f r o m th e s a m e h o s t. B o tto m : E n c a p s u la te d p a r a s ito id la r v a e a n d n o r m a l la r v a d is s e c te d f r o m th e s a m e h o s t. http://www.inhs.uiuc. edu/cee/wiedenlab/stemborer.html 1 S o c ia l In s e c ts • Sociality evolved multiple times in insects • Much of Earth’s fauna consists of social insects • They play major roles in entire ecosystems • Proliferation of ants and termites associated with change from solitary to social lifestyle http://www.biology.uc.edu/faculty/uetz/fly.htm Subsocial • More widespread – 13 orders of insects • no reproductive division of labor E u s o c ia l • Three traits – Some individuals in colony reproduce, others sacrifice reproduction – Cooperation in tending young – Overlap of generations within colonies • Ants, termites, some bees and wasps 2 ...
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