University:
Sam Houston State University
Course:
BIOL 1406 | General Biology I
Academic year:

2023
Views:

83

Pages:

11
Author:

larbiwxcvbn

Parasite/Host Relationships What is a HOST? What is a PARASITE?  Before we even begin, I want each student to write down on a piece of paper what they think a HOST is and what they think a PARASITE is. 1-2 minutes, GO! After you have written down your thoughts, fold your paper and trade it with someone else who is done in the class. 30 seconds, GO!  NEXT:  Read your piece of paper, if you think your paper has a correct answer raise your hand and read it out loud. If it is correct, you and the person who wrote the answer will receive *___ pts on your next quiz.  Final Answer (Should go something like this)   A HOST is any organism that another organism or bacteria live in or on. The PARASITE is the organism living inside (endoparasite) or on (ectoparasite) the HOST.   This means the parasite benefits at the expense of the host. The host-parasite relationship is typically species specific. *Lets think about and discuss some examples of a parasite/host relationship Some Examples: Common Types of Parasites:  Think fast! You have one minute to list as many parasites as you can. Remember to include what species they affect. Parasite Life Cycle:   The life cycle is a never-ending chain of events that lead to the parasite constantly reproducing and re-infesting another animal. There are two types of lifecycles:   Indirect - require different types of hosts or a vector (intermediate host) for various stages of their life cycle. Direct - a life cycle in which a parasite is transmitted directly from one host to the next without an intermediate host or vector of another species. The Intermediate Host    Required by some parasites to complete their life cycle, Advantages of an intermediate hosts include: increasing the spread of the parasite & protecting the parasite from spending too much time in the environment. What is the intermediate host in the life cycle of the Heartworm? Why do I need to know this?  Take a moment to explain to a neighbor the importance of understanding life cycles of common parasites.  Hint: think about controlling and preventing disease. Importance of Life Cycles  Understanding the life cycle of a parasite provides valuable information concerning:      The individual infested How the particular stage in the life cycle affects the host The most common time of year for the parasite to be in the environment Types of infestation/sickness caused by the organism Vulnerable points in the life cycle for the best treatment and prevention Think It Through   The next two slides show diagrams and descriptions of two different parasite lifecycles. Determine whether the depicted lifecycle is direct or indirect and give justification for your answer.