notes11 - Insect Parasitism Objectives 1. Differentiate the...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 1 Insect Parasitism 2 Objectives 1. Differentiate the three types of symbiosis 2. Describe the different ways to classify parasites 3. Discuss the costs and benefits of endo and ecto parasitism 4. Differentiate between parasite and parasitoid 6. Explain why small is good Chicken body louse Chicken feather louse UF JFB UF JFB 3 Introduction In this unit we will discuss insects that parasitize humans, mammals, and other arthropods. You will first learn the difference in three symbiotic relationships, and between parasite/parasitoid, parasitoid/predator, and you will learn about various endo- and ectoparasites. Be prepared for some repugnant pictures that illustrate some of the damage insect parasites can do to other animals. UF Sucking louse Read textbook pages 328-348. 4 Symbiotic Relationships Symbiotic relationships refer to interactions between two different species. In fact, when broken into its Greek roots, the word symbiotic means "life together." Sym means "together," and bio means "life." In this unit you will first learn about three different types of symbiotic relationships, mutualism , commensalism , and parasitism . The balance of the unit will then focus on different aspects of parasitism. These terms are generally used to describe the relationship between species but can also be used for interactions within a species, particularly humans. Mutualistic relationships are those in which both species involved benefit. For example, most friendships are a mutualistic relationship. As you can see in this picture ants and aphids have a special mutualistic relationship. The aphids feed the ants by secreting a sugary solution called honeydew through the tip of their abdomen. The ants in return protect the aphid by attacking predators such as ladybugs. NCSU 5 Symbiotic Relationships Continued In commensal relationships, one species benefits but the other neither profits nor is harmed. In this picture, orchids are growing on the side of a tree. The orchid needs the tree for support and protection, but the tree does not benefit nor is it harmed by the orchid's presence. UF Relationships in which one species benefits at the expense of another is a parasitic relationship. A good example of this is a mosquito and human relationship. As pictured here, this mosquito has inserted her mouthpart into a human to draw out blood. The human will have a nice itchy lump where the mosquito has injected its poison, but the mosquito will use the protein it got from the blood to make her eggs. UF 6 Parasitism Insects, more than any other arthropod class, practice parasitism. We humans are mostly aware of the insect parasites that affect us. Mosquitoes seem to be everywhere we go. Your household pets are commonly ailed by fleas, and schools often have to check for outbreaks of lice among the students. Not only do insects harm us, but they also harm other mammals, vertebrates, invertebrates and even members within their own class as depicted in the table
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

notes11 - Insect Parasitism Objectives 1. Differentiate the...

This preview shows document pages 1 - 2. Sign up to view the full document.

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