Questions tagged [parasitism]

Where one organism takes advantages from living alongside another organism to the detriment of the host.

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What is the difference between ‘classical’ and ‘non-classical’ pathogen resistance genes in plants?

I have stumbled across a mention of classical resistance genes against pests in plants, however the classification seems a bit vague. What would be classified as classical resistance genes and what as ...
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What could be a refuge in host-parasitoid models

I was reading about refuge effect in host-parasitoid models and I found somewhere that refuge does not have to be only a place in habitat where hosts can hide, but also some "situation" ...
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Refuge impact on growth rate

I have a question related to the refuge effect in ecological models. The assumption is that the population of hosts/prey is divided into two groups. One group consists of individuals that are safe ...
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Difference between "biotroph" and "parasitic"

In the studying process for my exam I learned about ways of life of pathogenes in plants. There, it was mentioned, they can live nekrotrophic, hemibiotrophic or biotrophic. As far as I understand, a ...
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How do tapeworms aid weightloss?

The 5 second answer people come up with is, "well they consume calories you otherwise would have". This logic works great if we're discussing the impact of my brother consuming part of my ...
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2 votes
1 answer
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Are there complexity requirements on potential hosts to be susceptible to parasites?

Are there lower bounds to complexity for hosts and how are these described or modeled? In other words, one would expect an organism to have a certain amount of "surplus tissue" in order for ...
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Ticks hitching a ride on a fly?

Recently, my brother has been bothered by some particularly aggressive houseflies. According to him, when these flies are squished, there is often a clacking noise, and then small arachnids come ...
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If a "parasite" is growing on a dead part of the host or on a completely dead host, does it still count as a parasite?

What I mean is the case where the parasite does not contribute to the death of the host (tissue). Instead, the parasite may start growing after the host (tissue) is already dead. I came up with this ...
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How do *Polistes sulcifer* (cuckoo paper wasp) eggs hatch so quickly?

The Polistes sulcifer wasp is a brood parasitic species, which parasitizes colonies of the paper wasp Polistes dominulus. During an extremely brief time window in the spring, just before the P. ...
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6 votes
1 answer
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Do any known viruses contain "junk" or parasitic genomic information?

After reading about so-called "mystery proteins" in this excellent summary of the coronavirus genome (and acknowledging that the "mystery" simply reflects our lack of knowledge about a very new virus),...
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The emergence of Phengaris butterflies from ant nests

The butterflies of the Phengaris genus (also known as Maculinea) are known to be brood parasitic. During the fourth instar, the caterpillars leave their food plant and mimic ant larvae, causing the ...
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Is it possible to kill parasitic worms by intoxicating oneself?

I've heard of parasites that can live in the human body and do a lot of damage to the host. There are even safer forms of worm-like parasites inside the intestine, but some parasites can live in the ...
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What parasites would be easiest to examine using a compound microscope?

I want to find some parasites that are easy to examine under the microscope. I'm a beginner but I have an olympus microscope with total magnification up to 400x (also 200x, 100x and 10x). I would ...
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2 votes
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What does it mean for Caenorhabditis species to be "pseudoparasitic"?

In this Wormbook chapter, Kiontke says that some Caenorhabditis species live "pseudoparasitically" on warm-blooded animals. What does it mean? What is a pseudoparasite? I understand a parasite to be ...
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Are there parasitoids of mosquitoes ? (other than nematodes)

Outside of nematodes, are there any examples of organisms that are parasitoids of mosquitoes ? I could not find any example in literature so far. I'm notably interested to know if the most known ...
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What are these bladder snail parasites?

I collected some bladder snails several months ago. While checking them out one day, I noticed that they were now infested with worm-like ectoparasites. Appearance and behavior Here's a picture of a ...
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Are there any plants that parasitize on animals?

It seems, fungi often infect animals, while plants it seems, never. Is it because the cellulose cell walls make them incompatible with animal tissue?
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Brood Parasitism - Parasitism/Ammensalism/Commensalism?

Parasitism has the parasite benefitting while the host is harmed. In brood parasitism, the cuckoo lays its eggs in a crow's nest for incubation. How does this harm the host? Why is it not considered ...
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Why are there no endoparasitic mammals or reptiles or birds? [closed]

I am curious why there aren’t any endoparasitic mammals, reptiles or birds Endoparasite being a parasite that live In the host whereas ectoparasite lives On the host I hope this clears up confusion
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2 votes
0 answers
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Why do parasitic amoeba lack a contractile vacuole?

Compared to the other amoeba, most parasitic amoeba lack contractile vacuole. I could not get the correct answer as to why these parasitic amoeba lack contractile vacuole.
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What is happening to this spider?

I was trailing through a local bird sanctuary yesterday (central Kentucky, USA) and came across this spider.. it's definitely dead, but what is hanging from the back part of its abdomen? Has some ...
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3 votes
1 answer
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Debug Fresno; why are the released mosquitos said to be sterile?

I saw in the news that Verily Life Sciences will participate in an experimental release of sterile male aedes aegypti mosquitos in Fresno, California. Aedes aegypti is considered an invasive species ...
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Are human disease-causing organisms living in other creatures helpful to them? [closed]

There are many examples of this. How is rabies helpful to a dog? How are Zika virus & Malaria helpful to a Mosquito?
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1 answer
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Will meat rot in alcohol below freezing?

I understand that freezing slows decay but I'm wondering what will happen if meat is kept in below freezing temperatures while submerged in a liquid that has a lower freezing rate, like alchohol?
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8 votes
5 answers
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What is the difference between a predator and a parasite?

A human encountering a tiger or a malaria plasmodium is likely to suffer, and the tiger/plasmodium is likely to gain from the transaction. Not necessarily a good example, and I am aware that a ...
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Would a vial of anticoagulated, warm blood attract mosquitoes?

Would mosquitoes feed on free blood as an easy source of nutrients? They home in on veins by means of infrared light (heat detection). Also, blood needs to be in liquid form. So would they feed on ...
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6 votes
2 answers
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How can a tongue-biting parasitic arthropod become a fully functional tongue?

From wikipedia: The parasite Cymothoa exigua [consumes a fish's tongue and] then replaces [it] by attaching its own body to the muscles of the tongue stub. The fish is able to use the parasite just ...
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3 votes
3 answers
368 views

Can galls be formed from mutualistic relationships?

According to Wikipedia, galls (cecidia) are formed by parasitic insects and mites like gall wasps (Neuroterus albipes). At some metamorphic stage, these organisms alter cell division processes in ...
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8 votes
1 answer
221 views

Recent classification for parasitoid (ecological relationships)

I'm about to present an exam about ecological interactions in biological control. Although the position of some groups is clear, in the case of parasitoids they are included sometimes as predators, ...
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4 votes
0 answers
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How to calculate the number of sterile insects that must be released in SIT?

The sterile insect technique (SIT) is used to control insect pests through overwhelming the population in sterile males. The increase in sterile males released into an environment causes the increase ...
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1 vote
1 answer
373 views

Can you find malaria parasites in saliva?

Can you find plasmodium parasites (malaria) in saliva under microscope from someone who's infected? Or it's only in the blood?
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Question about *Cryptosporidium hominis*

Cryptosporidium muris infects mostly rodents and it is usually found in gastric gladns. Cryptosporidium parvum infects humans and certain animals and it is found in the terminal ileum and colon. ...
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Question about microaerophilic parasite tolerance for oxygen

Does anyone know what is the maximal concentration of oxygen that can be tolerated by the parasite Giardia intestinalis?
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2 answers
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Why is the mosquito a definitive host in malaria?

I thought that the definition of a definitive host was that the parasite had to sexually reproduce in that particular host. I've been told that mosquitoes are the definitive host for the plasmodium ...
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3 votes
1 answer
157 views

What's the use of RNA editing in kinetoplast?

The genes of the mitochondrion (kinetoplast) of some Kinetoplastida - e.g. Trypanosoma brucei, the parasite which causes African sleeping sickness - are "encoded" in a way that the pre mRNA requiries ...
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1 answer
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What kind of mushroom(?) is this?

I found groups of these growing in the Lassen National Forest (Susanville, CA, USA). It looks like some sort of mushroom. I have Googled extensively, but can't seem to find a match.
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Can Naegleria fowleri enter through the eyes ( example rinsing/splashing eyes with water)

I understand that it primarily enters the body through the nose by by "feeding on the olfactory neurons in the nose" as answered here in a different question. Would the nerve cells in the eyes present ...
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4 votes
1 answer
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How do susceptible organisms prevent parasites from overcoming resistance?

Bt corn is genetically modified to kill borers, but "regulations require farmers to plant conventional varieties as well, which is intended to stop the borers becoming resistant." -Source How do ...
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10 votes
1 answer
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Can Naegleria fowleri enter through wounds into the bloodstream?

All the sources I've read said that Naegleria fowleri enters the brain through the nose. But lets say that someone had cuts on their arm or leg and they are swimming in water that is conducive to ...
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12 votes
1 answer
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Is Batesian Mimicry a form a parasitism? To what extent is the species with real defenses harmed by the defenceless species?

It seems like Müllerian mimicry would be an example of mutualism because both species would end up being eaten less by predators that only have to learn one pattern of warning symbols. But to what ...
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