CN105265248A - Mechanism for ecologically eliminating oncomelania snail population - Google Patents

Mechanism for ecologically eliminating oncomelania snail population Download PDF

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Publication number
CN105265248A
CN105265248A CN201510725432.3A CN201510725432A CN105265248A CN 105265248 A CN105265248 A CN 105265248A CN 201510725432 A CN201510725432 A CN 201510725432A CN 105265248 A CN105265248 A CN 105265248A
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CN
China
Prior art keywords
oncomelania
spiral shell
population
snail
eggs
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Pending
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CN201510725432.3A
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Chinese (zh)
Inventor
魏凯林
魏望远
陈祥麟
卜开明
易健民
唐课文
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Hunan Institute of Science and Technology
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Hunan Institute of Science and Technology
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Priority to CN201510725432.3A priority Critical patent/CN105265248A/en
Publication of CN105265248A publication Critical patent/CN105265248A/en
Pending legal-status Critical Current

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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00Protecting plants

Abstract

The invention relates to a mechanism for ecologically eliminating oncomelania snail population. Elimination of the oncomelania snail population is one of the major measures for eliminating schistosomiasis japonica. According to the invention, eggs laid by female oncomelania snails cannot form an oncomelania snail egg mud cover or are incompletely wrapped after the average water content in soil of oncomelania snail contained environment in a dry season is controlled, so that the oncomelania snail eggs cannot continuous to grow, the number of the laid oncomelania snail eggs and the oncomelania snail egg hatching rate are reduced by 90% per year and 85% per year respectively than a contrast area, the density of oncomelania snails is reduced year by year, and the oncomelania snail population disappears naturally in 3-4 years after intervention. Through molecular biological detection, died oncomelania snail eggs and normal eggs are identical in DNA site. Therefore, the mechanism has the advantages that 1, the mechanism for ecologically eliminating the oncomelania snail population is proved by using oncomelania snail egg morphological and molecular biological technologies; 2, morphological and biological features of died oncomelania snail eggs and normal oncomelania snail eggs are discovered for the first time in the intervention environment; 3, a scientific theoretical basis is provided for a foreign oncomelania snail eliminating method; and 4, the mechanism significantly reduces the cost of oncomelania snail eliminating and has no environment pollution.

Description

The ecological mechanism eliminating Oncomelania hupensis Population
Technical field
The present invention relates to Schistosoma japonicum intermediate host--the control of Oncomelania hupensis Population or elimination principle, techniques and methods, be applicable to lake type area and eliminate Japanese schistosomiasis.
Background technology
Japanese schistosomiasis is a kind of infectious disease through talent for swimming dye, and oncomelania is intermediate host, and eliminating Oncomelania hupensis Population is cut off route of transmission, one of measure of elimination schistosoma disease.
Oncomelania is amphibious mollusk, and become spiral shell mainly in land life, be 1 year in natural mean lifetime, oncomelania lays eggs quantity to maintain population with breeding.Marshland endemic area oncomelania is distributed in certain elevation in " two lines three are with ", characteristic distributions and water level and soil moisture content closely related, May annual October to next year is dry season, and oncomelania is looked for food on land, mating and egg reproduction, is also the breeding period of oncomelania; Oncomelania is adapted at laying eggs in the earth environment of soil moisture content 35% ± 5 semi-humid, wraps up in spiral shell ovum with secretion mixed soil suitcase simultaneously, forms shell, could continue to grow; Do not wrap up mud skin or wrap up incomplete spiral shell ovum and can not grow in environment in vitro, oncomelania is not laid eggs under water.The annual 6-9 month is flood period, and hatch young spiral shell immediately after completing the spiral shell ovum water logging of growth, young spiral shell seeks aquatic work, and growing the 7-8 month for becoming spiral shell and substituting old spiral shell, is also the puberty of oncomelania.
Summary of the invention
The present invention is according to oncomelania egg reproduction in the earth environment of soil moisture content 35% ± 5 semi-humid in dry season, the spiral shell ovum of output must wrap up Biological characteristics and environmental characteristic that mud skin could continue growth in vitro, adopt the technology reducing and have volution border soil moisture content dry season, be reduced to spiral shell spawning rate and affect when oncomelania is laid eggs and wrap up in spiral shell ovum with mud drum, blocking-up spiral shell ovum in vitro environment relaying supervention is educated alternative traditional chemical medicine and is controlled to spiral shell population.After intervention, oncomelania eggs on average number ratio check plot decline 90%, spiral shell ovum average percentage hatch rate decline 85% than check plot, and 3-4 after intervening, Oncomelania hupensis Population is withered away naturally.
Technical scheme of the present invention comprises the following steps:
1) before intervening, in dry season, measuring check plot and intervening district's (hereinafter referred to as two groups) different elevation soil moisture content, investigation oncomelania distribution density, spiral shell ovum counting and young spiral shell incubation rate is Baseline Data, proves that the primary condition such as spiral shell feelings, environment of two groups is identical.Intervene utility model patent of invention (ZL201320120073.5) that district adopts excavator to look in the distance Wei etc. according to team of the present invention there being volution border and ditch.
2) latter 1 year is intervened, dry season difference have spiral shell elevation soil average moisture content to drop to 26.5%, spiral shell ovum par declines 90% than check plot, spiral shell ovum average percentage hatch rate declines 85% than check plot, oncomelania distribution density declines year by year, and after intervening 3-4, Oncomelania hupensis Population is all withered away naturally.
3) principle:
The present invention has volution border soil moisture content by reducing dry season, suppresses oncomelania to be looked for food and the activity such as mating, reduce oncomelania and to lay eggs quantity and reduce the quality of spiral shell oophyte outer wrapping mud skin, thus the developmental rate reducing Oncomelania Eggs year by year reaches the target eliminating Oncomelania hupensis Population.In the environment of soil average moisture content 26.5%, oncomelania quantity of laying eggs declines 90%, and wherein the spiral shell ovum 85% of output does not wrap up mud skin or parcel not exclusively, makes spiral shell ovum in vitro can not heat and moisture preserving in environment, stop continuing grow and become dead ovum or few egg, Oncomelania hupensis Population quantity is reduced year by year; Dead ovum or few egg and normal spiral shell ovum are through molecular Biological Detection, and DNA site is identical, and both confirmations are spiral shell ovum, are great discovery first of the present invention and the theoretical foundation eliminating Oncomelania hupensis Population.And traditional chemical snail control with drugs method is for one-tenth spiral shell, oncomelania density then can only be reduced.
4) cost benefit and effectiveness comparison:
1. cost effectiveness and benefit: go out spiral shell usage mining machine construction cost 30 yuan/mu in outer continent, is disposable input.Traditional chemical snail control with drugs method drops into 300 yuan/mu (weeding and dispenser labour cost 250 yuan, medicine machineries etc. 50 yuan/mu) every year.The inventive method reduces costs expense 90%/mu/more than year.
Due to outer continent, to have spiral surface to amass huge, and the traditional chemical snail control with drugs method spiral surface that goes out every year amasss less than 15%, can only control higher risk area oncomelania density then, can not block Transmission of Schistosomiasis Japonica approach.After intervening according to the present invention, soil average moisture content 26.5% is significantly lower than check plot about 35%, and average oncomelania spawning rate declines 85% than check plot decline 90%, spiral shell ovum average percentage hatch rate than check plot, 3-4 after intervening, Oncomelania hupensis Population is withered away naturally, has blocked Transmission of Schistosomiasis Japonica approach; Lake region 5 province avoids crowd's new infeetioa schistosomiasis 500,000 patient and domestic animal 800,000/year every year, direct economic benefit 8,000,000,000 yuan/year, can reduce the spiral shell funds 10,000,000,000 yuan that go out every year.
2. social benefit:
1) the present invention to be applicable to outside lake areas continent and to eliminate Oncomelania hupensis Population, Be very effective and stable, to environment and rivers and lakes water resource pollution-free, there is international most advanced level;
2) Marshland of Yangtze River is the environment of good wetland and rich in pasture; eliminate Oncomelania hupensis Population; block schistosomiasis propagation approach to developing wetlands legislation industry, utilizing grass resource Developing Animal and fishery resources to provide security context; be in particular protection epidemic-stricken area population health and excellent environment is provided, there is great social benefit.
3) this patent can have spiral shell outer continent wide popularization and application at marshland endemic area rivers and lakes, and provide the method for science improvement for eliminating Oncomelania hupensis Population, wide market, has distinct economic and social benefit.
Accompanying drawing illustrates:
Accompanying drawing 1 be the present invention from the avette state of normal spiral shell naturally having volution border to gather, Fig. 2 is the cross-sectional configuration of Fig. 1;
Accompanying drawing 3 has spiral shell to intervene the few egg of environment collection or the form of dead spiral shell ovum, and Fig. 4 is the cross-sectional configuration of Fig. 3;
Below by embodiment, and by reference to the accompanying drawings, the present invention is further described.
Embodiment: Fig. 1 is normal spiral shell ovum, and black is opaque, the complete mud skin of chorion outer wrapping, like cellular; Fig. 2: 1 is the outer mud skin of spiral shell chorion; 2 is chorions; 3 is grow complete young spiral shell; Fig. 3 is dead spiral shell ovum or few egg, faint yellow, translucent, and shell is outer smooth, without mud skin or a little mud skin; Fig. 4: 1 is a little mud skin; 2 is chorions; 3 is colloidal carrier metallic substance.

Claims (3)

1. the ecological mechanism eliminating Oncomelania hupensis Population, in natural environment, the life-span of 95% oncomelania only has 1 year, it is characterized in that oncomelania dry season soil moisture content 35% ± 5 breeds lay eggs, oncomelania must wrap up spiral shell ovum with secretion and semi-humid earth after laying eggs, forming shell is normal spiral shell ovum (Fig. 1), and mud suitcase is wrapped up in complete, could grow by natural environment in vitro, puncture chorion, visible young spiral shell (Fig. 3), female spiral shell 80-100 of laying eggs every year on average herds, final become spiral shell rate 12.5%; Intervening, the spiral shell ovum (Fig. 2) that environment gathers is faint yellow, translucent, and shell does not have mud skin or wraps up imperfect, can not grow in vitro and dead in environment, after puncturing chorion, only has block-shape protein material, does not have young spiral shell, be called few egg or dead spiral shell ovum (Fig. 4); Described few egg or dead spiral shell ovum (Fig. 2) compare with normal spiral shell ovum (Fig. 1) under anatomical lens, form is slightly little, shell without or few mud skin, visible translucent spiral shell ovum colloid chorion, (Fig. 1) and (Fig. 3) form spiral shell ovum through molecular Biological Detection, its DNA site is identical, and both confirmations are the spiral shell ovum of oncomelania.
2. ecology as claimed in claim eliminates the mechanism of Oncomelania hupensis Population, it is characterized in that having in volution border described, have employed the intervention that this team has obtained utility model patent of invention (ZL201320120073.5), dry season different elevation is made to have spiral shell ambient soil average moisture content to maintain 26.5%, oncomelania is inhibit to look for food and the mobility of mating, quantity of laying eggs reduces 90% than contrast district, wherein spiral shell ovum average percentage hatch rate declines 85% than check plot, oncomelania density reduces year by year, 3-4 after intervening, Oncomelania hupensis Population is withered away naturally.
3. ecology as claimed in claim eliminates the mechanism of Oncomelania hupensis Population, what its character of innovation was applicable to lake type area of schisomiasis japonica rivers and lakes has the outer continent of spiral shell, science administering method is provided for eliminating outer continent Oncomelania hupensis Population, traditional chemical snail control with drugs can be replaced, non-environmental-pollution, for initiating, there is international most advanced level both at home and abroad.
CN201510725432.3A 2015-11-02 2015-11-02 Mechanism for ecologically eliminating oncomelania snail population Pending CN105265248A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007095842A1 (en) * 2006-02-21 2007-08-30 Fudan University Use of ginkgolic acids in preparing biotic pesticide for killing snails and preventing schistomiasis
CN101233842A (en) * 2007-01-30 2008-08-06 康强胜 Method and facility for killing oncomelania
CN101965827A (en) * 2010-06-18 2011-02-09 赵林斌 Method for killing oncomelania and lymnaeidae in pond
CN203160213U (en) * 2013-03-18 2013-08-28 湖南省血吸虫病防治所 Ditch structure for ditching, draining and snail-controlling on outer bottomland

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007095842A1 (en) * 2006-02-21 2007-08-30 Fudan University Use of ginkgolic acids in preparing biotic pesticide for killing snails and preventing schistomiasis
CN101233842A (en) * 2007-01-30 2008-08-06 康强胜 Method and facility for killing oncomelania
CN101965827A (en) * 2010-06-18 2011-02-09 赵林斌 Method for killing oncomelania and lymnaeidae in pond
CN203160213U (en) * 2013-03-18 2013-08-28 湖南省血吸虫病防治所 Ditch structure for ditching, draining and snail-controlling on outer bottomland

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
魏望远等: "洞庭湖洲滩开沟沥水控制钉螺繁殖的研究", 《中国血吸虫病防治杂志》 *
黄士龙: "国内钉螺生态及残存钉螺综述", 《广东卫生防疫资料》 *

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