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Ecology

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Steffi Varghese
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BIOL212-13A (HAM)
ECOLOGY

PARASITISM AND ITS INTERACTION
TO THE SPECIES POPULATION

Introduction

“Parasitism is a type of co-operative relationship between organisms of different species where one species, the parasite, benefits from an extended, close association with the other species, the host, which is harmed” (Smith & Smith 2012, pg no 299).
A parasite usually depends on host species for food, habitat and dispersal in order to increase their fitness. Though parasites obtain benefits from the host species, it does not kill the host as predators do. But due to diminutive growth, boniness, change in behaviour and infertility can cause death for the host organisms. Generally, parasites are much smaller than their hosts, which had a specialized mode of life and reproduce more rapidly and in bigger numbers than their hosts (Smith & Smith, 2012). The main objective of this essay is to describe how the interaction of parasite-host relationship affect the population size and dynamics of both parasite and host species.

Discussion

Host are considered as the habitats for parasites because it lives on or in the body of the host. The parasites enter into the body of the host by various pathways such as mouth, nasal passages, skin, rectum, urogenital systems and digestive systems. Although parasites harm the host, it is in the parasites best interest not to kill the host, because it relies on the host’s body functions for their survival and reproduction (Smith & Smith, 2012). Some examples of host–parasite relationship and its interaction on the populations are described below:

1. Interaction of hemiparasitic plants to their host

The hemi parasitic plants extract resources from the vascular system of their hosts through a particular transfer organ called haustorium. Hemi parasites benefits water and minerals by attacking the host’s xylem vessel, but they can only obtain very little carbon from it. The hemi parasitic plants have a condensed and non-existing root networks, thus its help them to acquire all mineral nutrients and water from the host, whereas organic carbon can only be obtainable by their own photosynthetic activity.

Hemi parasitic plants have an indistinct association with their hosts which on the one hand, signify exclusive sources of inorganic nutrients but on the other hand, competition for light due to the co-existence of these host plants in the hemi parasite vicinity. Meanwhile, hemi parasites that are capable of efficient organic carbon abstraction should be slightly affected by shading from their host. Mostly, the hemi parasitic plants obtain low-cost nutrients and minerals from an environment where plant performances are limited by certain amount of nutrients and a low primary productivity. Due to these conditions, the hemiparasitic plants can effectively decrease the growth rate of their host and therefore reduce its competitive ability. For example, Mistletoes which are hemiparasitic plants, capable of obtain photosynthesis by their own but they enter the host tree to extract water and nutrients (Tesital et.al, 2010).

2. Parasitic interaction between Leucochloridium paradoxum and Succinea

Some parasites are capable of altering the actual behaviour of their animal hosts. The parasitic worm Leucochloridium paradoxum and its influence on the host, adsorbate land snails of the genus Succinea is a good example of this type of change in the animal host behaviour. Like many other land snail species, Succinea generally prefers low levels of light. However, once parasitized by the worm Leucochloridium, the snails become attracted to higher levels of light. The parasitic worms makes this happen by growing inside the snail’s body and then occupies its eyestalks in large numbers and make them brightly coloured. Therefore the change in the eyestalks of the snails caused by the parasitic interaction makes the host to search for higher light intensities, for example, on plants tops where the snails get feed. As soon as these noticeable eyestalks reach the top of the plants they are snooped by birds that peck them off. Because of this, the population density of the genus Succinea gets reduced by the parasitic interaction of the worm Leucochloridium whereas the worm find the bird as its next host for its life cycle to continue (Mcmenamin & Mcmenamin, 1994).

3. Parasitic effect of the isopod Cymothoa exigua to its host the snapper fish, Lutjanus peru.

The parasitic isopod Cymothoa exigua is a fish parasite mainly found in the snapper fish Lutjanus peru. The study about this parasitic isopod and its effects to the snapper fish population was carried out by Ruiz and Madrid in 1991. According to their study, they found that Cymothoa exigua is a parasitic isopod normally recognised as a fish parasite. These parasites were mainly found in the mouth and gill chamber of the snapper fish. The main difference in the parasitic attachment to the host was that all female isopods were found inside the buccal cavity, attached to the host’s tongue whereas all males were found in the gill chamber as well as in the mouth, clinging to a female (Ruiz & Madrid, 1992).
According to their study, Ruiz and Madrid suggest that with respect to the host parasite association the isopod seems harmless or only slightly harmful. The females of C.exigua are capable of destroying the hosts tongue and eventually take the role of tongue in the host, thus cause degeneration of tongue. On the other hand, the damages caused by the male parasite include hematophagy, mucus secretion on gill chamber which gradually affect the respiratory system of the host. As per the study, C. exigua is not a serious damage causing parasite to the host but its impact could transform the behaviour of heavily parasitized fishes affecting their dietary habits, reproductive capacity and their escape response towards predators (Ruiz & Madrid, 1992).

Conclusion

Parasitism is considered as a symbiotic association between organisms, where one species benefits from the other without making any harm. The parasite mainly depends on the host’s body for their survival and reproduction; therefore it does not kill the host though the host dies soon or later by infection caused by parasitic interaction. Some examples of parasite-host interaction include hemiparasitic plant interaction, interaction of Leucochloridium paradoxum to Succinea and fish tounge parasite interaction.

Mistletoes are an example for hemi parasitic plants which obtain water and minerals from the host tree through xylem vessel. These parasitic interactions decrease the growth of the host tree and its competitive ability. The parasitic worm Leucochloridium interacts by changing the actual behaviour of the land snail Succinea. This makes the snail more accessible to the bird predators. The parasitic isopod Cymothoa exigua is a fish parasite mainly found in the snapper fish Lutjanus peru. This parasitic isopod affects the host by removing its tongue and eventually takes the role of tongue in the host.

Reference

McMenamin, M.A.S & McMenamin,D.L.S. (1994). Hypersea: Life on land. Columbia University press, New York.

Ruiz, L.A & Madrid, V.J. (1992). Studies on the biology of the parasitic isopod Cymothoa exigua Schioedte and Meinert, 1884 and its relationship with the snapper Lutjanus peru Nichols and Murphy, 1992, from commercial in Michoacan. Journal of Ciencias Merinas, 18(1):19-34.

Smith, M.T & Smith, L.S. (2012). Elements of Ecology (8th ed.). United States of America: Pearson.

Tesital, J., Plavocova, L & Cameron, D.D. (2010). Interactions between hemiparasitic plants and their hosts: The importance of organic carbon transfer. Journal of plant Signaling and Behavior, 5(9):1072-1076. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3115071/

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