webob.info: Scientific Studies: Relationships
There's a special type of predator-prey relationship called parasitism. Now you should think about all the creepy crawlies like fleas, viruses, and mosquitoes. Some parasites cause disease. Others cause pain. Others are almost never noticed by their hosts. However, the basic relationship is always the same—good for. Parasitism: Parasitism, relationship between two species of plants or animals in which one benefits at the expense of the other.
If the beginning of this lesson already has you wanting to take an extra-long shower or washing your hands more carefully, I get it. But don't bother because there is no escaping parasites, no matter how clean or stinky you are. Parasitism is a relationship between two living things. In this kind of relationship, one member benefits the parasite and the other member is usually harmed the host.
But just because a parasite is living off a host doesn't automatically mean the host is going to be hurt badly. In fact, parasites NEED the host to stay alive so that they can, too! There are some parasites that can do good things for their host. In the old days, people used to put leeches on injuries like skin diseases or infections because the leech would suck out the bad blood! Let's look at some different kinds of parasites that may be found on humans.
Parasitic plants and fungi can attack animals.
parasitism | Definition & Examples | webob.info
A fungus causes lumpy jaw, a disease that injures the jaws of cattle and hogs. There are also parasitic plants and fungi that attack other plants and fungi.
A parasitic fungus causes wheat rust and the downy mildew fungus attacks fruit and vegetables. Some scientists say that one-celled bacteria and viruses that live in animals and harm them, such as those that cause the common cold, are parasites as well.
However, they are still considered different from other parasites. Many types of parasites carry and transmit disease.
Parasitism Lesson for Kids: Definition & Examples
Lyme disease is trasmitted by deer ticks. There are twelve Superfamilies of wasps which are entirely or mainly parasitoid, such as the ichneumonoid wasps, whose species number over 80, The interaction between the parasitoid and the host is fundamentally different from true parasites and their host, and shares some characteristics with predation.
A vector is a third party that carries the parasite to the host. Thus, with malariathe mosquito is the vector, the Plasmodium protozoan is the parasite, and the mammal is the host. The mosquito is an ectoparasite as well as a vector. An epiparasite is one that feeds on another parasite. Kleptoparasites steal food from other species. Brood parasites such as the Cuckoo induce other species to raise their young. The Cowbird is another brood parasite.
Social parasites take advantage of interactions between members of social organisms such as ants or termites. Ecology Dispersal and reproduction Parasites are adapted to small, separated habitats. For a parasite, each host is an island surrounded by a hostile environment. For a small organism, the distances between hosts, or groups of hosts, is a hazard. Adaptations to bridge this hazard are: Mass production of spores or eggs.
Dispersal of fertile females.10 Mind Controlling Parasites
Dispersal by attaching to a larger organism many ectoparasites. Extreme longevity of resting stages spores or cysts. For example, plant parasitic nematodes may remain quiescent for 23 years. Parthenogenesisand inbreeding among offspring of a single female, are common in parasites. So parasites exist in small, genetically similar groups with little flow of genes between them. In consequence, they have adaptations to solve their problems of dispersal and reproduction.
Parasites are highly specialised Parasites face an environment which varies in time and space. Consequently, both local geographic races and polymorphism occur.
Both may occur in the same species.
Parasites are very specialised feeders: A few use more than two host species. Complex life cycles Many parasites have complex life-cycles.
Tremadodes, the flukesare a parasitic class of flatworms Platyhelminthswith over 20, species. Most of them infect molluscs in the first part of the life-cycle, and vertebrates in the second part. The biology of scrub typhus is even more complex.
- It’s here: the NEW Britannica Kids website!
- Keep Exploring Britannica
- ADDITIONAL MEDIA
It involves these factors: