Pdf palpalis group tsetse flies are the major vectors of human african trypanosomiasis, and visuallyattractive targets and traps are important. African trypanosomiasis african sleeping sickness disease. They are the insect vectors of some serious diseases. Veterinary parasitology, 21976 143152 143 elsevier scientific publishing company, amsterdam printed in the netherlands tsetse flies as vectors of trypanosomes a. Together, tsetse flies exist in over 10 million km 2 and span over 37 countries. Research article feeding patterns and xenomonitoring of. There are three extant subgenera, austenina townsend, nemorhina robineaudesvoidy, and glossina wiedemann that correspond to the fusca, palpalis, and morsitans species groups respectively. Viviparous tsetse flies glossina species offer an excellent system to explore patterns of reproductive investment. Loss of water by excretion and defaecation in the tsetse. Tsetse definition of tsetse by the free dictionary. A dynamic species distribution model of glossina subgenus morsitans. Tsetse flies play an obligate role in the successful development and transmission of trypanosoma spp. The adults range in length from 6 to 14 mm and in all the 23 known species are various shades of brown ranging from light yellowish brown to dark blackish brown.
Pdf factors affecting trypanosome maturation in tsetse flies. Training manual food and agriculture organization of the united. In some species the abdomen has alternate darker and lighter bands. Tsetse flies are important because of their ability to spread diseases among man and among domestic animals. Prevalence of symbionts and trypanosome infections in tsetse flies of two villages of the faro and deo. They assume that all particles in this case, insects move randomly and independently. Although zebras are nonpreferred hosts, the possible chemical basis of their avoidance by tsetse flies is unknown. The word tsetse means fly in tswana, and refers to all 23 species of the fly genus glossina. General morphology glossina species are tan or brown flies, ranging in length from 6 to 14 mm, excluding the proboscis tubular mouthpart in invertebrates used for feeding. Tsetse flies as vectors of humaninfective trypanosomes. As said above they are often found in pockets and you can then rush through the pocket. Wigglesworthia glossinidius, wolbachia pipientis and sodalis glossinidius.
Tsetses are found abundantly in forests and along the edges of lakes and rivers in central africa. The older usage is antiquated and redundant, see the second paragraph of the current page for details. This tsetse species, like most savannah species 44,52, seems to have a very low propensity to enter a trap cage without first landing on the cloth, unlike some riverine species such as g. Masiga, international centre of insect physiology and. Vitamin b6 generated by obligate symbionts is critical for. Tsetse flies thrive in an optimum temperature of 27 c, and even though some species inhabit the same ecological niche, these species coexist since vary in the times they reproduce and are abundant. We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. Maternal effects on offspring size in a natural population. A dynamic species distribution model of glossina subgenus. Use of tiny targets to control tsetse flies in gambian hat foci.
Pdf a colour opponent model that explains tsetse fly attraction. Tsetse flies as vectors of trypanosomes sciencedirect. The rear trailing edge of the wings is not protected by a thickfigure 1. Arthropod vectors tsetse flies 2 p a g e fly round zambia the fly catchers move along this path, stop at welldefined points and capture during a fixed period the tsetse flies which are attracted.
Developing photoreceptorbased models of visual attraction. Central and west african species glossina palpalis palpalis dramane kaba1, tusevo zacarie2, alexis makumyaviri mpondi3, flobert njiokou4, henriette. Tsetse flies and trypanosomosis in south africa and the reentry of south africa into the field of tsetse and trypanosomosis research. Environmental impact of tsetse eradication in senegal. Tsetse flies exclusively feed on blood, lactate and give birth to live. Tsetse flies study guide by mcka includes 20 questions covering vocabulary, terms and more. Exposing the radioactivity in the building blocks that make up accra by linda nordling 10. Section 1 basic biology and anatomy of the tsetse fly. Thus, tsetse flies are adapted to efficiently metabolize amino acids and, more specifically, to catabolize proline to accomplish atp biosynthesis, 14, a characteristic that is associated to obligatory blood. The glossinidae, or tsetseflies, form a monogeneric family of the diptera. Apr 27, 2014 this movie shows tsetse fly blood feeding, water excretion, pregnancy, birth of a larva, larval wandering and pupation. The authors use a quantitative modelling framework to describe and explore the features of the biology of tsetse flies glossina spp. Humans are infected by two types, trypanosoma brucei gambiense tbg and trypanosoma brucei rhodesiense tbr.
Different species of glossina may carry specific forms of trypanosoma which vary in their virulence and periodicity. The sterile insect technique for control of tsetse flies in africa by willem takken and michael weiss african trypanosomiasis and its major vector, the tsetse fly, have drawn worldwide attention due to the devasting effects they cause in large areas of tropical africa. The genus glossina has about 34 species in three groups of species. Tsetse flies as tools for minimally invasive blood. Thank you for your interest in spreading the word about the bmj. Adult bloodfeeding tsetse flies, trypanosomes, microbiota and the fluctuating environment in subsaharan africa article pdf available in the isme journal 97 december 2014 with 295 reads. In 2012 the world health organization published a plan targeting the elimination of sleeping sickness as a public health problem by 2020. Author summary the use of repellents from nonpreferred hosts represents an innovative approach to control animal african trypanosomosis by limiting contact between tsetse flies and livestock. Understanding how tsetse flies smell their prey could save lives by linda nordling 09. The identification of tsetse reservoirs and refugia mark h. Tsetse, also tsetse fly, common name for any of several african bloodsucking insects. Prevention of sleeping sickness requires avoiding contact with the tsetse fly. At rest, tsetse flies fold their wings over each other, a distinctive trait which makes them very easy to identify.
Below is an map from a study done by rogers and randolph in 1986. Tsetse flies are classified into a single genus glossina weidemann 1830. Glossina are the sole cyclical vectors of african trypanosomoses. In this study, the environmental impact of a tsetse eradication program in the niayes of senegal was assessed using an innovative monitoring strategy based on fruitfeeding insect species. A variety of mammalian species comprising both domestic and wild animals were detected in the tsetse fly samples. Tsetse flies transmit the parasites that cause sleeping sickness. African trypanosomiasis, also known as african sleeping sickness or simply sleeping sickness, is an insectborne parasitic disease of humans and other animals. The aim in hat foci is not to eradicate tsetse although eradication should be embraced if feasible, but to stop transmission by reducing tsetsehuman contact, and modelling suggests that. Female tsetse flies feed on a wide range of animal blood, and produce mature larvae which develop within a uterus. Life scientists from ucla and the university of bern have identified a key gene in the transmission of african sleeping sickness a severe disease transmitted by the bite of infected tsetse. Bats, rats, and other mammals are sources of blood meal for wild tsetse flies. Characteristic of tsetse flies is that at rest, the two wings lie one on top of the other over the back of the abdomen. Some species may approximate this, but tsetse flies spend a significant amount of time resting, either sleeping off a large bloodmeal or waiting for a larva to finish development and be born. A phenotypic characteristic differentiating tsetse.
We hypothesized that certain chemical components of zebra skin odor play a role in. There are three extant subgenera, austenina townsend, nemorhina robineau. African animal trypanosomiasis aat remains an important threat for livestock production in some affected areas. A typical tsetse fly has a yellow to brown body, depending on the species, and is generally larger than a housefly. African trypanosomiasis, also called african sleeping sickness, is a parasitic disease spread by the tsetse fly. Both wigglesworthia and sodalis are thought to be symbiotic by contributing bcomplex vitamins that are lacking in the bloodonly diet of the tsetse and longevity is reduced in flies lacking these symbionts. Box 915, cardiff cf1 3tl, united kingdom abstract langley, p. Standardising visual control devices for tsetse flies. This article provides information on making a tsetse fly trap to control these pest flies as part of a drought management strategy in tsetse fly invaded areas. Proline metabolism is essential for trypanosoma brucei. Trypanosomiasis transmitted by tsetse flies genus glossina continues to.
It had long been known that domestic stock could not be kept where tsetse flies occurred and that disease was associated with the flies. Thus, tsetse flies are adapted to efficiently metabolize amino acids and, more specifically, to catabolize proline to accomplish atp biosynthesis, 14, a characteristic that is associated to obligatory blood feeding dipterans 15. As the visible spectral distribution of shadows has a maximum at around 460 nm it is suggested that the. The tsetse flies feed only on blood, and in the act of piercing the skin and drawing blood, the flies pass on the blood parasite trypanosoma to previously uninfected animals or men, causing the disease. Tsetse flies feed on the blood of vertebrate animals including humans and in doing so, transmit the sleeping sickness parasite from infected animals to uninfected ones. Tsetse flies take blood meals at intervals of approximately 23 days in the hot season. The disease that tsetse flies transmit can kill livestock or make them sick.
Tsetse fly, genus glossina, any of about two to three dozen species of bloodsucking flies in the housefly family, muscidae order diptera, that occur only in africa and transmit sleeping sickness african trypanosomiasis in humans and a similar disease called nagana in domestic animals. Tsetse flies are the biological vectors of several trypanosomes affecting livestock and of two trypanosome species, trypanosoma brucei gambiense and t. We only request your email address so that the person you are recommending the page to knows that you wanted them to see it. The kathekani tsetse flies are commonly found in game parks, where they are carried by buffaloes and elephants. Additionally, proline is essentiality of proline catabolism in trypanosoma brucei. These flies can lower quality of life and lead to a loss of milk and meat.
The tsetse flies feed only on blood, and in the act of piercing the skin and. Quizlet flashcards, activities and games help you improve your grades. Glossina species food and agriculture organization of the united. Horizontally transferred genetic elements in the tsetse. The land infested with tsetse flies is often cultivated by people using hoes rather than more efficient draught animals because nagana, the disease transmitted by tsetse, weakens and often kills these animals. Salivarian trypanosomes grow in mammals, where they depend on glucose, and as procyclic forms in tsetse flies, where they metabolize proline. Tsetse fly saliva accelerates the onset of trypanosoma. Some species may approximate this, but tsetse flies spend a significant amount of time resting, either. African trypanosomiases are infectious diseases caused by trypanosomes.
Oct 30, 2019 malawi fights tsetse flies, disease after wildlife relocated. Oct 01, 20 they assume that all particles in this case, insects move randomly and independently. Intrinsic and synthetic stable isotope marking of tsetse. Tsetse flies are of paramount importance in africa because of their role as vectors of trypano some infections of man and domestic animals, which have had a profound effect on the economy and development of that continent fig. Managing tsetse transmitted trypanosomosis by insecticide.
Blood meal sources and bacterial microbiome diversity in. Key gene involved in transmission of african sleeping. The invertebrate microbiome contributes to multiple aspects of host physiology, including nutrient supplementation and immune maturation processes. Tsetse flies, blue shadows, colour attractants letter to the editor tsetse flies glossina spp. All tsetse species are capable of transmitting humaninfective trypanosomes. Tsetse flies are host to a number of intracellular symbionts. In kenya has shown that the tsetse fly hide and breed in thickets. Anyway to address the original post, tsetse flies are terrible little creatures. The female fly has a uterus wherein an individual egg hatches, the resulting larva feeding on secretions provided by milk glands.
The below mentioned article provides notes on tsetse flies as vectors. They have been studied a lot because they can spread sleeping sickness and other diseases. Standardizing visual control devices for tsetse flies horizon ird. Symptoms include fatigue, high fever, headaches, and muscle aches. Review of tsetse flies and trypanosomosis in south africa. Tsetse flies are known to be attracted by blue fabrics with a high reflectivity at 460 nm. The water which is abstracted from the gut contents serves to bring the tissues of. To avoid stress to the test animals and its potential influence on the test parameters, minimally invasive blood sampling offers numerous advantages. Tsetse control can contribute to disease control thanks to cheap and efficient tiny targets that attract tsetse using a panel of blue.
Tsetse flies are large biting flies that live in the tropical regions of africa. This method gives by no means an idea of the true fly density but makes it possible to observe fluctuations in the density of the flies over time. Tsetse fly, genus glossina, any of about two to three dozen species of bloodsucking flies in the housefly family, muscidae order diptera, that occur only in africa and transmit sleeping sickness african. Challenges facing the elimination of sleeping sickness in. Programs and information to assist in the planning and implementation of tsetse control operations. Analysis of multiple tsetse fly populations in uganda. Tsetse flies are regarded as a major cause of rural poverty in subsaharan africa because they prevent mixed farming. Blood meal sources and bacterial microbiome diversity in wild. Nagana, a form of sleeping sickness that primarily affects cattle and. The sterile insect technique for control of tsetse flies in. Dec 30, 2019 in this study, the environmental impact of a tsetse eradication program in the niayes of senegal was assessed using an innovative monitoring strategy based on fruitfeeding insect species that. It was a journey of more than a thousand miles from durban, the last three hundred or so of which we had to make on foot, owing to the frequent presence of the dreadful tsetse fly, whose bite is fatal to all animals except donkeys and men. Intrinsic and synthetic stable isotope marking of tsetse flies. Interwoven biology of the tsetse holobiont journal of.
The relocation of hundreds of elephants to malawis largest wildlife reserve was meant to be a sign of hope and renewal in this. Tsetse flies as vectors with diagram biology discussion. Factors affecting trypanosome maturation in tsetse flies article pdf available in plos one 22. Proline metabolism is essential for trypanosoma brucei brucei. Pdf blood feeding tsetse flies as hosts and vectors of mammals. Despite this variability, the results indicate that this method of marking tsetse flies with c labeled glucose is a technically viable marking method for tsetse flies which would enable clear. Mar 19, 2020 bats, rats, and other mammals are sources of blood meal for wild tsetse flies.
It is caused by protozoa of the species trypanosoma brucei. A proposal for tsetse fly glossina genome projects april 2010. Tsetse flies can be grouped into three main subgroups depending on the environment they inhabit. Mammalian african trypanosome vsg coat enhances tsetse s. Tsetse control and the elimination of gambian sleeping. Also, no flies were captured in the cages of the sticky traps in these trials. This tsetse species, like most savannah species 44,52, seems to have a very low propensity to enter a trap cage without first. The history of human sleeping sickness in east africa is characterized by the appearance of disease epidemics interspersed by long periods of endemicity.
The deposited, fullgrown larva buries itself in the ground and pupates. Nations training manual for tsetse control personnel 43. Visible spectral distribution of shadows explains why blue. Prevalence of symbionts and trypanosome infections in tsetse flies. Mosquitoes, tsetse flies, and sand flies, respectively, are required for transmission of these pathogens to their mammalian hosts. The tsetse the word tsetse means fly destructive to cattle, thus the name tsetse fly is redundant is an ovoviviparous vector of african trypanosomiasis. The flies also have unusually long proboscises, which are used to suck blood from their prey. Tsetse fly simple english wikipedia, the free encyclopedia. Safarieyes, would love to know which repeleant works on tsetse. Research article feeding patterns and xenomonitoring of trypanosomes among tsetse flies around the gashakagumti national park in nigeria solomonngutorkarshima, 1 idrisa. History of sleeping sickness in east africa clinical. The water content of the blood meal of tsetse flies is reduced from 79 to about 55% within the first 3 hr. Zebra skin odor repels the savannah tsetse fly, glossina. Pdf research on the zooanthropophilic blood feeding tsetse flies biology conducted.
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