Nesting & Social Behavior of Wasps and Honey Bees in Mansehra | InformativeBD

Nesting biology and Social behaviour of Paper wasp (Polistes flavus) and Honey bee (Apis mellifera) in District Mansehra, Pakistan

Muzafar Shah,  Mian Sayed Khan,  Muhammad Ather Rafi,  Sardar Azhar Mehmood, and Muhammad Farooq,  from the institute of Pakistan. wrote a Research article about, Nesting & Social Behavior of Wasps and Honey Bees in Mansehra. Entitled, Nesting biology and Social behaviour of Paper wasp (Polistes flavus) and Honey bee (Apis mellifera) in District Mansehra, Pakistan. This research paper published by the International Journal of Biosciences | IJB. an open access scholarly research journal Biosciences. under the affiliation of the International Network For Natural Sciences| INNSpub. an open access multidisciplinary research journal publisher.

Abstract

In the present study, nesting and social behaviour were carried out of Polistes flavus (Cresson) and Apis mellifera (Smith) from district Mansehra. Nest of paper wasps were found among bunches of leaves in the tree with 1-5 flat steps layers containing hundreds of hexagonal cells in one sided hanging to downward. Hive of the honey bee were pouched like containing double sided hexagonal cells one for eggs while in other stored food materials. X-ray diffraction was used for elemental analysis of P. flavus nests showed Ca with the highest amount of element while K with the lowest amount in descending order a: P. flavus: Ca>Al>Si; A. mellifera: Ca>Si>Mg. Social behaviour of A. mellifera showed strong defensive behaviours, pseudoattack, subsequent erratic flight, wing buzzing, mandibular pecking, abdominal pumping and abdominal twisting while P. flavus showed week defensive behaviour as compared to A. mellifera. Parental care was highly developed in A. mellifera. By disturbing, they try to protect their larvae in their nest by high defensive behaviour.

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Introduction

The name wasp applied to many winged insects of the order Hymenoptera, which also includes ants and bees (Bertram et al., 2003). Most of the wasps are carnivorous, feeding on insects, grubs, or spiders. They have biting mouthparts, and have stings through which they paralyze their prey for eating. The sting can be used repeatedly. The thorax of a wasp is attached to the abdomen by a narrow stalk. Some wasps are solid black or dark blue, but most have red, orange, or yellow wings or markings while Stripes are common. The great majority of the waps are solitary, but one family (Vespidae) includes both social forms (paper wasps, hornets and yellow jackets) and solitary forms, e.g., the potter wasps (Bertram et al., 2003).

In social wasp colonies there are usually three castes, the egg-laying queens (one or more per colony), the workers, or sexually undeveloped females and the drones or males. Social wasps build nests of a coarse, papery material, prepared by masticating wood fiber. The eggs are deposited in the compartments or cells of the nest where they develop into larvae and then pupae, emerging as adults. Adult social wasps feed chiefly on nectar and plant sap but feed the larvae with masticated animal food. In temperate regions a colony lasts a single season, the drones and workers dying in the fall. The mated queens take shelter during the winter and in spring lay eggs and start new colonies. In the tropics colonies continue indefinitely, dividing when they grow very large (Oldroyd, 2004).

Nests are typically built in hollow trees, but they are often found in barns, sheds, attics, and hollow areas of house walls. They rarely build the nests that are free hanging or in unprotected areas, such as tree and houses. They use decaying wood fiber to build a shell around their nest as protection. As winter approaches, the worker bees die off and the queen will leave the existing nest and find an empty log or other sheltered spot to spend the winter. They also use the bark fiber of trees to build their nests. They have smooth stingers, so they can sting over and over again. Their stings also carry venom that makes the stings hurt, itch or swell for about 24 hours. A European hornet sting has the same risk of allergic reactions from as with other wasp stings (Jones et al., 2004).

The paper wasp, Polistes flavus is the most common type of wasp which is cosmopolitan throughout the world and mostly built their nest in human houses and trees. It is also the single largest genus within the family Vespidae, with over 300 recognized species and subspecies. Their innate preferences for nestbuilding sites leads them to commonly build nests on human habitation, where they can be very unwelcome; although generally non-aggressive, they can be provoked into defending their nests (Espelie et al., 1996). All species are predatory and they may consume large numbers of caterpillars, in which respect they are generally considered beneficial. Polistes wasps can be identified by their characteristic flight, their long legs and dangle below their body (Turillazzi et al., 1992). Polistes wasp complete their life cycle in four stages, pre-emergence phase, worker phase, reproductive phase and intermediate phase (Figure 2b; Karsai et al., 1995).

The honey bee, Apis mellifera queens are polyandrous. When they are about five days old they mate with a large number (625) of males (Estoup et al., 1994; Palmer et al., 2000) of diverse genetic backgrounds (Baudry et al., 1998). Honey bee colonies, therefore, comprise multiple patrilines of workers, each sired by a different male (Crozier et al., 1996). Because the males are haploid, their daughters share 75 % of their alleles by descent. Conversely, workers that are daughters of different males share only 25 % of their alleles; those derived from their common queen mother. Task specialization has now been demonstrated for an extraordinary array of honey bee behaviour including nectar and pollen foraging (Calderone et al., 1988), caring for brood and removing dead larvae (Page et al., 1989b), grooming nest mates (Frumhoff et al., 1988), removing corpses and guarding the nest entrance (Robinson et al., 1988), collecting water (Kryger et al., 2000), and thermoregulating the nest (Jones et al., 2004; Oldroyd et al., 1994). It has long been speculated that task specialization provides colony level benefits, and that genetically mediated diversity in task response thresholds is important to the task allocation system in honey bees and by inference, other polyandrous haplodiploid social insects (Bertram et al., 2003; Calderone et al., 1989; Crozier et al., 1985; Fuchs et al., 1994; Myerscough et al., 2004).

Honey bee colonies, are able to regulate the internal temperature of their nests with great precision (Jones et al., 2004; Moritz et al., 1992; Southwick, 1991; Heldmaier et al., 1987). The workers regulate brood nest temperature depends on whether heating or cooling is required (Seeley, 1985). Waxes are used for building brood and storage cells and cuticular waxes minimize the loss of water across the integument and protect from attack by microorganisms, parasitic insects, and predators (Buckner, 1993). The queen substance is reportedly transmitted within the hive attached to the body surfaces of worker bees as a result of grooming behaviour (Seeley, 1979; Naumann, 1991). Drones deposit a long lasting inhibitory pheromone on the combs to decrease the drone brood production where it is perceived by the workers and the queen (Omholt, 1988). Tautz (1997) suggests that the dance sites of the bees on the wax comb may be chemically marked in some way because dancers keep to the same site during a foraging day. Objectives of the present paper include, to study the nesting and social behaviour between P. flavus and A. mellifera with parental care of their offspring.

Reference

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Article source : Nesting biology and Social behaviour of Paper wasp (Polistes flavus) and Honey bee (Apis mellifera) in District Mansehra, Pakistan 

Acrotylini Grasshoppers of Pakistan: A Taxonomic Study | InformativeBD

Studies on the tribe Acrotylini (Acrididae: Orthoptera) from Pakistan

Barkat Ali Bughio, Riffat Sultana, M. Saeed Wagan, Farman Ullah, and Muhammad Ather Rafi, from the institute of Pakistan. wrote a Research article about, Acrotylini Grasshoppers of Pakistan: A Taxonomic Study. Entitled, Studies on the tribe Acrotylini (Acrididae: Orthoptera) from Pakistan. This research paper published by the International Journal of Biosciences | IJB. an open access scholarly research journal Biosciences. under the affiliation of the International Network For Natural Sciences| INNSpub. an open access multidisciplinary research journal publisher.

Abstract

The tribe Acrotylini are considered as pest of cereal crops, vegetables, orchards and pastures in Pakistan. During present study 5 species and subspecies of the tribe Acrotylini i-e Acrotylus humbertianus (Saussure), A. insubricus insubricus (Scopoli) A. patruelis (Herrich-Schaffer) A. longipes longipes (Charpentier) and A. longipes subfasciatus were examined. In this manuscript general morphological characteristic along with detail study of phallic complex of each species has carried out. Overall finding showed that there is significant difference in the epiphallus, ancorae, lophi and spermatheca of these siblings’ species of Acrotylini.

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Introduction

Grasshopper insects’ fauna belonging to sub family Oedipodinae are of great economic importance in Pakistan. The representatives of tribe Acrotylini are considered as pest, because they pose a constant threat to cereal crops, vegetables, orchards, Pastures and rain-feed areas. These grasshoppers are commonly known as band-winged insects and are characterized by different colors. They are widely distributed throughout the world. The grasshoppers of the tribe Acrotylini are entirely vegetarian and voracious feeders . They cause sever damage to various valued crops i.e. rice, wheat, sugarcane and their surrounding grasses. Majority of them (both adults and nymphs) are active during sun shine and cause heavy damage in cultivated crops. Their population mostly increases during the hottest days of the years. The grasshoppers of tribe Acrotylini are entirely vegetarian and voracious feeders, majority of them are active during sun shine can cause heavy damage in cultivated crops when their population may be increased at high densities. Mostly they are known as geophiles (living in open grounds) and Phytophyles (found at vegetation, grasses, herbs and shrubs). Earlier, genus Acrotylus was studied by (Kirby, 1914, Mischehnko 1936, Bei-Bienko and Mischehnko 1951, Uvarov 1966, Dirsh, 1975) and from Pakistan (Ahmed, 1980, Ritchie, 1981-82, Wagan 1990, Baloch, 1997, and Tokhai 1996). Further, on the basis of different features. Moeed (1966) reported the damaging status of A. insubricus insubricus at agricultural fields of Larkana district. (Ahmed, 1980) surveyed the grasshoppers fauna of Pakistan and reported that some of the Oedipodinae grasshoppers are the pest of orchards. (Wagan and Solangi , 1990) reported heavy damage of some Oedipodinae species on cultivated crops in different areas of Sindh Province. In order to bring the knowledge of Acrotylus of the Pakistan update the present studies highlight the diagnostic characters of phallic complex and epiphallus that have useful value for the purpose of accurate identification. An attempt has been made to classify species belonging to sub-family Oedipodinae on the basis of easily recognizable characters of external morphology and genitalia components. The study of these two parameters would led to the correct identification of this tribe, which will be very useful to control the pest at appropriate time.

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Article source : Studies on the tribe Acrotylini (Acrididae: Orthoptera) from Pakistan 

Allelopathic Impact of Redroot Pigweed on Summer Savory | InformativeBD

Allelopathic effects of aqueous extracts of different organs of redroot pigweed (Amaranthus retrofelexus L.) on summer savory (Satureja hortensis L.)

Ebrahim Benyas, Mohsen Aghaz, Ozra Sadat Khatamian Oskooei, Saied Zehtab Salmasi and Yaghub Raii, from the institute of Iran. wrote a Research article about, Allelopathic Impact of Redroot Pigweed on Summer Savory. Entitled, Allelopathic effects of aqueous extracts of different organs of redroot pigweed (Amaranthus retrofelexus L.) on summer savory (Satureja hortensis L.). This research paper published by the International Journal of Biosciences | IJB. an open access scholarly research journal Biosciences. under the affiliation of the International Network For Natural Sciences| INNSpub. an open access multidisciplinary research journal publisher.

Abstract

In order to demonstrate the allelopathic effects of different organs (root, shoot and whole plant) of redroot pigweed (Amaranthus retrofelexus L.) on germination, emergence, growth and development of summer savory (Satureja hortensis L.) under laboratory and greenhouse conditionan experiment was carried out as CRD design with nine and five replications at laboratory and greenhouse of the Faculty of Agriculture, University of Tabriz, Iran, respectively. Results showed the significant effects of different organs aqueous extracts (AEs) of redroot pigweed on germination percentage, germination rate and normal seedlings percentage. Germination rate decreased by shoot, root and whole plant AEs compare with control. Shoot and whole plant AEs of redroot pigweed were able to reduce summer savory biomass more than the root aqueous extract.

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Read more : Morphological & Genetic Adaptation in Amaranthus spinosus | InformativeBD 

Introduction

Weeds are the most severe and widespread biological constraint to crop production and cause invisible damage till the crop is harvested. Weeds are undesirable plants which compete with main crops in the growth media for nutrients, moisture, space, light and hamper the healthy growth ultimately reducing the growth and yield both qualitatively and quantitatively. Allelopathy is defined as inhibitory/stimulatory the effect(s) of one plant on other plants through the release of chemical compounds in the environment (Rice, 1984). Allelopathy interactions are primarily based on the ability of certain species to produce secondary chemical compounds that exert some sort of biological effects on other organisms, many of which are unknown. The chemical causing the allelophatic effects are called allelochemicals. Allelopathy is characterized by a reduction in plant emergence or growth, reducing their performance in the association (Florentine et al., 2006).

Allelopathy provides a relatively cheaper and environmental friendly weed control alternative. This can be considered as a possible alternative weed management strategies (Cheema et al., 2000). The world consumption of medicinal plants as pharmaceuticals, cosmetics and as a food supplement for the improvement of human welfare is increasing day by day. One of the possible solutions is allelopathy, the utilization of the chemical interaction between plants by introducing modern biological and ecological methods. The various methods such as race, frequency control, chemical, mechanical and on chemical as properties of plants allelopathic weed control are applied in weed control management systems.

Allelochemicals emancipated as residues, exudates and leachates by many plants from leaves, stem, roots, fruit and seeds reported to interfere with growth of other plants (Asgharipour and Armin, 2010). These chemicals products mainly affect plants at seed emergence and seedling levels (Alam and Islam, 2002; Hussain et al., 2007; Naseem et al., 2009). The allelopathic potential of several weeds have been studied in the laboratory (Bhowmik and Doll, 1984). Batish et al., (2007) conducted experiment using residue of Chenopodium murale on the growth of chickpea and pea and found that their root and shoot length significantly decreased.

The present study was conducted to examine the allelopathic effects of aqueous extracts of different organs of redroot pigweed (A. retrofelexus L.) on germination, emergence, growth and development of summer savory (S. hortensis L.) in the University of Tabriz.

Reference

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Batish DR, Lavanya K, Singh HP, Kohli RK. 2007. Root-mediated allelopathic interference of nettle-leaved  goosefoot  (Chenopodium  murale)  on wheat (Triticum aestivum). Journal of Agronomy and Crop Science 193, 37–44. http://dx.doi.org/10.1111/j.1439-037X.2006.00243.x

Benyas E, Zehtab Salmasi S, Hassanpouraghdam MB, Aharizad S, Nasrollahzade S. 2009. Allelopathic effects of chenopodium album L. and Xanthium strumarium L. on summer savory (Satureja hortensis L.). Plant Science 46, 537-541.

Benyas E, Hassanpouraghdam MB, Zehtab Salmasi S, Khatamian Oskooei OS. 2010. Allelopathic effects of Xanthium strumarium L. shoot aqueous extract on germination, seedling growth and chlorophyll content of Lentil (Lens culinaris Medic.). Romanian Biotechnological Letters 15, 5223-5228.

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Naseem M, Aslam M, Ansar M, Azhar M. 2009. Allelopathic effects of sunflower water extract on weed control and wheat productivity. Pakistan Journal of Weed Science Research 15, 107-116.

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Shahrokhi S, Darvishzadeh M, Mehrpooyan M, Farboodi M. 2012. Comparison of allelopathic effects of Amaranthus retroflexus L. different organs extracts on germination and initial growth of Alvand and Zarrin wheat cultivars. International journal of Agronomy and Plant Production 3, 489-494.

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Article source : Allelopathic effects of aqueous extracts of different organs of redroot pigweed (Amaranthusretrofelexus L.) on summer savory (Satureja hortensis L.) 

Morphological & Genetic Adaptation in Amaranthus spinosus | InformativeBD

Morphological and genetic variation of Amaranthus spinosus L.: an adaptation evidence of climate differences and gene interaction

Arik Arubil Fatinah, from the institute of Indonesia. Estri Laras Arumingtyas, from the institute of Indonesia and Retno Mastuti, from the institute of Indonesia. wrote a Research article about, Morphological & Genetic Adaptation in Amaranthus spinosus. Entitled, Morphological and genetic variation of Amaranthus spinosus L.: an adaptation evidence of climate differences and gene interaction. This research paper published by the International Journal of Biosciences | IJB. an open access scholarly research journal Biosciences. under the affiliation of the International Network For Natural Sciences| INNSpub. an open access multidisciplinary research journal publisher.

Abstract

Amaranthus spinosus (spiny amaranth) natively live in America, Africa, Australia, Europe and Asia. This plant can be used as medicinal plant and also as food or feed. A. spinosus has phenotypic variation, especially in leave and stem type. It is because of plant adaptation. Plant adaptations impact to variation on morphological and genetic. Chloroplast DNA (cpDNA) is a common molecular marker that used in the genetic variability analyses. Phenotypic variation was analyzed using morphological and molecular data. The trnL intron, matK and rbcL genes were amplified and sequenced. The sequence data analyses using MEGA5, Bioedit and DNAsp software’s. The molecular data shown that A. spinosus from tropical zone was higher genetic variability then temperate zone. Plant in the tropical zone easy to be colonized and there isn’t gene flow barrier. So that, A. spinosus that adapt to different habitat have different morphological character and have higher genetic variability. 

Amaranthus is a core genus of Amaranth family (Amaranthaceae), and consists of 70 species and natively life in America, Africa, Australia, Asia, and Europe (Frassen et al, 2001). Amaranthus spinosus is one of seven spesies Amaranthus that natively life in Indonesia, especially in Java Island (Backer 1986). Member of these genera widely used as traditional medicinal plant, especially as antiviral, antimalarial, antidiabetic, antibacterial, antihelminthic and snake antidote (Kusumaningtyas et al, 2006; Vardhana, 2011; Kumar et al, 2010). Amaranth genera also can be used for food, feed, and as an ornamental plant (Backer, 1986; Prosea, 2012).

Amaranthus spinosus has different morphological characteristic. The morpho-logical characteristics were affected by plant adaptation and genetic variation among them (Schlichting and Pigliucci, 1998; Fatinah et al, 2012). Amaranthus spinosus can be adapted in the different ecogeographic and wide range of edaphic factor (environmental heterogeneity) (Costea et al, 2004). Amaranth genus has capability tointerbreed among species in the same genus. The interbreeding also causes different morphological charac-teristic of A. spinosus (Murray, 1940; Popa et al, 2010).

Chloroplast DNA is a molecular marker that widely used for taxon identification (Clegg and Zurawski, 1991). The cpDNA has an independent genome that encoded several proteins, which are protein related photosynthetic and housekeeping genes. The cpDNA encode 30-50 tRNA genes and 100 other protein. The gene that encode protein divided into several kinds, they are gene as splicing factors (rpoB, rpoC1, rpoC2, rpsl6 and matK) and protein related photosynthetic (rbcL, afpB, psaA and petB) (Baumgartner et al, 1993; Sugiura, 1995; De Las Rivas et al, 2002).

Genetic variation in A. spinosus was analyzed based on PCR-sequencing cpDNA, especially analyze gene that encode tRNA (trnL intron), splicing factor protein (matK) and protein related photosynthetic (rbcL). The trnL intron is a non-coding regions, this region has higher insertion and deletions (indels) which reflect the plant evolutionary (Roy and Penny, 2007). The matK gene encodes maturase protein as a splicing factor and include in intron group II. The matK gene has high nucleotide substitution rate, insertion and deletion. Mutation in matK gene reflects plesiomorphic characteristics and adaptive to environmental changing (Vogel et al, 1999; Hao et al, 2010). The rbcL gene encodes ribulose-1.5- biphosphate carboxylase/oxygenase large subunit (Ellis, 1979). The rbcL gene has 1428 bp in length and has conserve primer. The rbcL sequence can be used for cogeneric analysis (Kress et al, 2005). The rbcL gene is a core locus in chloroplast genome (plastome) multigenes (Newmaster et al, 2006). The rbcL gene is an adaptive gene to environment heterogeneity and widely used for plant evolutionary and plant adaptation mechanism (Golmez et al, 2005; Sen, 2011).

The previous study using trnL intron indicate that A. spinosus has high genetic variability. The genetic variability differs among molecular marker that used. So in this paper we used the third molecular marker to analyze A. spinosus genetic variation to know the relationship among phenotypic variation, genetic variation and plant adaptation in the tropical and temperate zone.

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Listeria Detection in Crayfish: PCR-Based Study in Iran | InformativeBD

Prevalence of Listeria monocytogenes in the crayfish (Astacus leptodactylus) by polymerase chain reaction in Iran

Faham Khamesipour, Amin Khodadoustan Shahraki, Manouchehr Moumeni,  Reza Khadivi Boroujeni, and Mehrdad Yadegari, from the institute of Iran. wrote a Research article about, Listeria Detection in Crayfish: PCR-Based Study in Iran. entitled, Prevalence of Listeria monocytogenes in the crayfish (Astacus leptodactylus) by polymerase chain reaction in Iran. This research paper published by the  International Journal of Biosciences | IJBan open access scholarly research journal Biosciences. under the affiliation of the International Network For Natural Sciences| INNSpub. an open access multidisciplinary research journal publisher.

Abstract

The Crayfish are the largest freshwater crustacean via high skill opposite wide range of environment variables and The freshwater Crayfish Astacus leptodactylus (A. leptodactylus) is the one of the important species of Crayfish family that rearing it significant in several nations . Iran has a significant role in export of A. leptodactylus to European nations. A number of species have been used aquaria and some use seafood consumer. Listeriosis have become an important topic in biomedical research because of its central role in food microbiology and medical microbiology. In Iran, some reports is available on prevalence of Listeria spp. in A. leptodactylus. The aim of this study was to find the prevalence of Listeria monocytogenes in A. leptodactylus meat samples in Iran. From November 2012 to February 2013, a total of 40 meat samples of A. leptodactylus samples were obtained from randomly selected localities in “Aras Dam” , Western-Azerbaijan Province , Iran. The samples were tested for the presence of L. monocytogenes using Polymerase Chain Reaction (PCR). Three samples (7.5%) were positive for L. monocytogenes by PCR method. The results show that crayfish from the studied area regularly contain this pathogen that is important to public health. Consumption of these sea foods, either raw or undercooked, may give to food borne illness in Iran.

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Introduction

The Crayfish are the largest freshwater crustacean via high skill opposite wide range of environment variables and The freshwater Crayfish Astacus leptodactylus (A. leptodactylus) is the one of the important species of Crayfish family that rearing it significant in several nations (McMahon, 1986; Holdich et al., 1997).Iran has a significant role in export of A. leptodactylus to European nations. At the moment, England, Germany, Sweden and France are the main importers of crayfish from Iran (Matinfar, 2007). A number of species have been used for aquaculture aim and more in recent times, there has been an increase in the sale of crayfish for aquaria and some use seafood consumer in the world (Alderman and Polglase, 1988).

Listeriosis is a significant bacterial infection make happen via a gram positive facultative anaerobe, rodshaped, non-spore-forming and intracellular bacteria (Gawade et al., 2010). The bacteria Listeria spp. have become an important topic in biomedical research because of their central role in food and medical microbiology. The genus Listeria is composed of six species: L. monocytogens, L. innocua, L. grayi, L. ivanovii, L. seeligeri, and L. welshimeri. L. monocytogenes is the most important human pathogen among Listeria spp , even though very rare cases of infection because of L. seeligeri and L. ivanovii have been described (Mclauchlin, 1997; Guillet et al., 2010). The existence of any Listeria species in food is possibly an indicator of poor hygiene. However, since L. monocytogenes is the major human pathogen, there is widespread agreement that the goal should be to exclude this organism from the food chain wherever possible, and to keep up conditions that will inhibit its multiplication in foods in which This organism is an acute and regularly fatal illness by clinical manifestations resembling sepsis or meningitis in immunocompromised patients and neonatal babies and flu-like illness or abortion during pregnancy in women, encephalitis, gastroenteritis,  this bacterium can grow (Wyller et al., 1999; Rocurt et al., 2000).

arthritis and conjunctivitis (Vázquez-Boland et al., 2001; Delgado, 2008). In ruminants, listeriosis is characterized as encephalitis presentation typical ’circling’ symptoms, conjunctivitis, stillbirth, third trimester abortion, etc. (Hoelzer et al., 2012). The case-fatality rate from listeriosis is usually about 20– 30% (Farber and Peterkin, 1991). Its public health importance lies in its presence everywhere in nature that shows clearly its wide host range, which includes 40 mammals, 20 birds, crustaceans, fishes and ticks (Gawade et al., 2010). This pathogen is generally distributed in nature and is commonly transmitted to human through contaminated water and food (Kuhn et al., 1988). Biofilm formation on food-contact surfaces via this pathogen is a sign of severe public health hazards (Zameer et al., 2010). L. monocytogenes is one of very few pathogenic organisms which can grow at frozen temperatures. Consequently, the storage of food at low temperatures don't growth of this pathogen (Junttila et al., 1988). Most important occurrences of listeriosis have been associated by the consumption of foods of animal origin (Iida et al., 1998; Rocourt et al., 2000), specially sea foods, for example shrimp, mussels and undercooked fish (Brett et al., 1998; Wan Norhana et al., 2010).

Since fish and fishery products are perhaps a vehicle for L. monocytogenes, it is significant to have data on the prevalence of this pathogen. L. monocytogenes has been isolated often from fish and fish products from different parts of the world (Hassan et al., 2001; Mena et al., 2004; Basti et al., 2006; Parihar et al., 2008; Wan Norhana et al., 2010). Therefore, regular screening and constant surveillance of food products including seafood for the presence of this pathogen are required. PCR is a technique which possesses sensitivity, rapidity and specificity and could be employed to help rapid diagnosis of L. monocytogenes contamination (Rahimi et al., 2012). Therefore, it is considered that DNA extraction and PCR could become a practical difference to the conventional techniques for detection of L. monocytogenes (Rahimi et al., 2012 ). The current study deals by the isolation and confirmation of L.

monocytogenes from sea foods by rapid, reliable and simple PCR method. In Iran, there are not many reports is available on prevalence of Listeria spp. among crayfish (Astacus leptodactylus), but is available on prevalence of Listeria spp. in several works on other foods, specially sea foods. The aim of the current study was to study prevalence of L. monocytogenes in A. leptodactylus using PCR, in Iran.

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Article source : Prevalence of Listeria monocytogenes in the crayfish (Astacus leptodactylus) by polymerase chainreaction in Iran