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PubMed2003

Invertebrate responses to the management of genetically modified herbicide-tolerant and conventional spring crops. II. Within-field epigeal and aerial arthropods.

The effects of the management of genetically modified herbicide-tolerant (GMHT) crops on the abundances of aerial and epigeal arthropods were assessed in 66 beet, 68 maize and 67 spring oilseed rape sites as part of the Farm Scale Evaluations of GMHT crops. Most higher taxa were insensitive to differences between GMHT and conventional weed management, but significant effects were found on the abundance of at least one group within each taxon studied. Numbers of butterflies in beet and spring oilseed rape and of Heteroptera and bees in beet were smaller under the relevant GMHT crop management, whereas the abundance of Collembola was consistently greater in all GMHT crops. Generally, these effects were specific to each crop type, reflected the phenology and ecology of the arthropod taxa, were indirect and related to herbicide management. These results apply generally to agriculture across Britain, and could be used in mathematical models to predict the possible long-term effects of the widespread adoption of GMHT technology. The results for bees and butterflies relate to foraging preferences and might or might not translate into effects on population densities, depending on whether adoption leads to forage reductions over large areas. These species, and the detritivore Collembola, may be useful indicator species for future studies of GMHT management.

Agriculture↗
PubMed2004

Emission of Plutella xylostella-induced compounds from cabbages grown at elevated CO2 and orientation behavior of the natural enemies.

Several plant species defend themselves indirectly from herbivores by producing herbivore-induced volatile compounds that attract the natural enemies of herbivores. Here we tested the effects of elevated atmospheric CO(2) (720 micromol mol(-1)) concentration on this indirect defense, physiological properties, and constitutive and induced emissions of white cabbage (Brassica oleracea ssp. capitata, cvs Lennox and Rinda). We monitored the orientation behavior of the generalist predator Podisus maculiventris (Heteroptera: Pentatomidae) and the specialist parasitoid Cotesia plutellae (Hymenoptera: Braconidae) to plants damaged by Plutella xylostella (Lepidoptera: Plutellidae) in the Y-tube olfactometer. Elevated CO(2) levels did not affect stomatal densities but reduced specific leaf area and increased leaf thickness in cv Lennox. In addition to enhanced constitutive monoterpene emission, P. xylostella-damaged cabbages emitted homoterpene (E)-4,8-dimethyl-1,3,7-nonatriene, sesquiterpene (E,E)-alpha-farnesene, and (Z)-3-hexenyl acetate. Growth at elevated CO(2) had no significant effect on the emissions expressed per leaf area, while minor reduction in the emission of homoterpene (E)-4,8-dimethyl-1,3,7-nonatriene and (E,E)-alpha-farnesene was observed at elevated CO(2) in one of two experiments. The generalist predator P. maculiventris discriminated only between the odors of intact and P. xylostella-damaged cv Rinda plants grown at ambient CO(2) concentration, preferring the odor of the damaged plants. The specialist parasitoid C. plutellae preferred the odor of damaged plants of both cultivars grown at ambient CO(2) but did not detect damaged cv Lennox plants grown at elevated CO(2). The results suggest that elevated atmospheric CO(2) concentration could weaken the plant response induced by insect herbivore feeding and thereby lead to a disturbance of signaling to the third trophic level.

Animals↗
PubMed2002

Correlated evolution of male and female morphologles in water striders.

Sexually antagonistic coevolution may be an important force in the evolution of sexual dimorphism. We undertake a comparative study of correlated evolution of male and female morphologies in a clade of 15 water strider species in the genus Gerris (Heteroptera: Gerridae). Earlier studies have shown that superfluous matings impose costs on females, including increased energetic expenditure and predation risk, and females therefore resist males with premating struggles. Males of some species possess grasping structures and females of some species exhibit distinct antigrasping structures, which are used to further the interests of each sex during these premating struggles. We use this understanding, combined with coevolutionary theory, to derive a series of a priori predictions concerning both the types of traits in the two sexes that are expected to coevolve and the coevolutionary dynamics of these traits expected under sexually antagonistic coevolution. We then assess the actual pattern of correlated evolution in this clade with new morphometric methods combined with standard comparative techniques. The results were in agreement with the a priori predictions. The level of armament (different abdominal structures in the two sexes) was closely correlated between the sexes across species. Males are well adapted to grasping females in species in which females are well adapted to thwart harassing males and vice versa. Furthermore, our comparative analyses supports the prediction that correlated evolution of armament in the two sexes should be both rapid and bidirectional.

Animals↗
PubMed2006

Fitness conflicts and the costs of sociality in communal egg layers: a theoretical model and empirical tests.

Individuals within complex social groups often experience reduced reproduction owing to coercive or suppressive actions of other group members. However, the nature of social and ecological environments that favour individual acceptance of such costs of sociality is not well understood. Taxa with short periods of direct social interaction, such as some communal egg layers, are interesting models for study of the cost of social interaction because opportunities to control reproduction of others are limited to brief periods of reproduction. To understand the conditions under which communal egg layers are in fitness conflict and thus likely to influence each other's reproduction, we develop an optimality model involving a brood guarding 'host' and a nonguarding disperser, or 'egg dumper'. The model shows that when, where intermediate-sized broods have highest survival, lifetime inclusive fitnesses of hosts and dumpers are often optimized with different numbers of dumped eggs. We hypothesize that resolution of this conflict may involve attempts by one party to manipulate the other's reproduction. To test model predictions we used a lace bug (Heteroptera: Tingidae) that shows both hosts and egg dumpers as well as increased offspring survival in response to communal egg laying. We found that egg-dumping lace bugs oviposit a number of eggs that very closely matches predicted fitness optimum for hosts rather than predicted optimum of dumpers. This result suggests that dumpers pay a social cost for communal egg laying, a cost that may occur through host suppression of dumper reproduction. Although dumper allocation of eggs is thus sub-optimal for dumpers, previous models show that the decision to egg dump is nevertheless evolutionarily stable, possibly because hosts permit just enough dumper oviposition to encourage commitment to the behaviour.

Animals↗
PubMed1989

Mycetocyte symbiosis in insects.

1. Non-pathogenic microorganisms, known as mycetocyte symbionts, are located in specialized 'mycetocyte' cells of many insects that feed on nutritionally unbalanced or poor diets. The insects include cockroaches, Cimicidae and Lygaeidae (Heteroptera), the Homoptera, Anoplura, the Diptera Pupiparia, some formicine ants and many beetles. 2. Most mycetocyte symbionts are prokaryotes and a great diversity of forms has been described. None has been cultured in vitro and their taxonomic position is obscure. Yeasts have been reported in Cerambycidae and Anobiidae (Coleoptera) and a few planthoppers. They are culturable and those in anobiids have been assigned to the genus Torulopsis. 3. The mycetocyte cells may be associated with the gut, lie free in the abdominal haemocoel or be embedded in the fat body of the insect. The mycetocytes are large polyploid cells which rarely divide and the symbionts are restricted to their cytoplasm. 4. The mycetocyte symbionts are transmitted maternally from one insect generation to the next. In many beetles (Anobiidae, Cerambycidae, Chrysomelidae and cleonine Curculionidae), the microoganisms are smeared onto the eggs and consumed by the hatching larvae. In other insects, they are transferred from mycetocytes to oocytes in the ovary, a process known as transovarial transmission. The details of transmission in the different insect groups vary with the age of the mother (adult, larva or embryo) at which symbiont transfer to the ovary is initiated; whether isolated symbionts or intact mycetocytes are transferred; and the site of entry of symbionts to the egg (anterior, posterior or apolar). 5. Within an individual insect, the biomass of symbionts varies in a regular fashion with age, weight and sex of the insect. Suppression of symbiont growth rate and lysis of 'excess' microorganisms may contribute to the regulation of symbionts (including freshly-isolated preparations of unculturable forms) are used to investigate interactions between the partners. However, some methods to obtain aposymbiotic insects (e.g. antibiotics and lysozyme) deleteriously affect certain insects and aposymbionts may differ from the symbiont-containing stocks from which they were derived. 7. The mycetocyte symbionts have been proposed to synthesize various nutrients required by the insect. The symbionts of beetles and haematophagous insects may provide B vitamins and those in cockroaches and the Homoptera essential amino acids. The role of symbionts in the sterol nutrition of insects is equivocal. 8. Mycetocyte symbionts may have evolved from gut symbionts or guest microorganisms. The association is monophyletic in cockroaches but polyphyletic in many groups, including the sucking lice, beetles and scale insects.(ABSTRACT TRUNCATED AT 400 WORDS)

Animals↗
PubMed2004

Phylogenetic distribution of TTAGG telomeric repeats in insects.

We examined the presence of TTAGG telomeric repeats in 22 species from 20 insect orders with no or inconclusive information on the telomere composition by single-primer polymerase chain reaction with (TTAGG)6 primers, Southern hybridization of genomic DNAs, and fluorescence in situ hybridization of chromosomes with (TTAGG)n probes. The (TTAGG)n sequence was present in 15 species and absent in 7 species. In a compilation of new and published data, we combined the distribution of (TTAGG)n telomere motif with the insect phylogenetic tree. The pattern of phylogenetic distribution of the TTAGG repeats clearly supported a hypothesis that the sequence was an ancestral motif of insect telomeres but was lost repeatedly during insect evolution. The motif was conserved in the "primitive" apterous insect orders, the Archaeognatha and Zygentoma, in the "lower" Neoptera (Plecoptera, Phasmida, Orthoptera, Blattaria, Mantodea, and Isoptera) with the exception of Dermaptera, and in Paraneoptera (Psocoptera, Thysanoptera, Auchenorrhyncha, and Sternorrhyncha) with the exception of Heteroptera. Surprisingly, the (TTAGG)n motif was not found in the "primitive" pterygotes, the Palaeoptera (Ephemeroptera and Odonata). The Endopterygota were heterogeneous for the occurrence of TTAGG repeats. The motif was conserved in Hymenoptera, Lepidoptera, and Trichoptera but was lost in one clade formed by Diptera, Siphonaptera, and Mecoptera. It was also lost in Raphidioptera, whereas it was present in Megaloptera. In contrast with previous authors, we did not find the motif in Neuroptera. Finally, both TTAGG-positive and TTAGG-negative species were reported in Coleoptera. The repeated losses of TTAGG in different branches of the insect phylogenetic tree and, in particular, in the most successful lineage of insect evolution, the Endopterygota, suggest a backup mechanism in the genome of insects that enabled them frequent evolutionary changes in telomere composition.

Animals↗
PubMed1997

Wild hosts of Pentatomids: ecological significance and role in their pest status on crops.

Phytophagous stink bugs (Heteroptera: Pentatomidae) are important pests of many crops, feeding mostly on seeds and immature fruits. During feeding they introduce their stylets to remove the cells' contents. The resulting damage includes drop and/or malformation of seeds and fruits. As stink bugs are generally polyphagous, they feed on cultivated and uncultivated plants; consequently, wild host plants play an important role in the increase in population levels of agricultural pest species. These plants are important food resources for development of nymphs and reproduction of adults. Because these bugs are multivoltine and feed in general on temporarily restricted food plants, host-switching from food plants of nymphs to those of adults is common and has varying effects on adult performance depending on the quality of the foods involved. Although polyphagous, local populations of many pentatomid species may show specific feeding habits, restricting their host range to fewer plant species. The knowledge of host plant sequences, including cultivated and uncultivated hosts, and the use of wild hosts as trap plants will improve management of pest species. Finally, future research should focus on determining which plants are preferably used by stink bugs, how they affect insect performance, at what rate populations increase on these plants, and how effective natural enemies are at this time.

Journal Article↗
PubMed1999

Bionomics of the Anthocoridae.

The family Anthocoridae (Hemiptera:Heteroptera) contains between 400 and 600 species distributed worldwide, chiefly on the continents but also on oceanic islands. They are small (1.4-4.5 mm) and common to a wide variety of habitats. Many are found in cryptic habitats such as galls, several widespread genera are surface feeders on small arthropods (Anthocoris, Orius, and Tetraphleps), and others can be found in ant nests and, especially, under bark. Wing polymorphism is common in this family, often associated with the cryptic habit. Most known species are predaceous, though some take plant food as well (e.g. Orius insidiosus, Orius pallidicornis). A few of these are believed to be entirely phytophagous (Paratriphleps laeviusculus). Their small size and often generalized feeding habits have resulted in about 30 introduced species, mostly accidental. A few have been introduced deliberately as biological control agents (Anthocoris spp., Montandoniola moraguesi, O. insidiosus, Orius tristicolor, and Tetraphleps spp.). Most nonindigenous species seem to have been distributed as a result of human activities, especially commerce. The predaceous habits of many Anthocoridae have attracted the attention of researchers who work in agroecosystems. Integrated pest management programs often include these predators, which has given us greater knowledge about these species than those found in natural ecosystems. Exciting discoveries about the attractiveness to these bugs of certain volatile plant and arthropod compounds are opening new areas of investigation into their chemical ecology. The reactions of these tiny predators will surely become better understood as a result.

Journal Article↗
PubMed2001

Natural and human impacts on invertebrate communities in Brazilian caves.

Species richness, abundance, distribution and similarity between cave invertebrate communities were compared among seven caves located in the Peruaçu River valley, north of Minas Gerais State, Brazil. Such comparisons aimed to determinate the degree of biological complexity in the sampled caves, calculated by the "Index of Biological Complexity in Caves", presented in this manuscript. The presence of potential or real impacts on the cave fauna was also investigated. A total of 1,468 individuals belonging to 57 families of: Acarina, Pseudoscorpionida, Araneida, Opilionida, Amblypygi, Isopoda, Geophilomorpha, Scutigeromorpha, Spirostreptida, Coleoptera, Collembola, Diptera, Dictyoptera, Ephemeroptera, Ensifera, Heteroptera, Hymenoptera, Lepidoptera, Plecoptera, Psocoptera, and Trichoptera was collected. Caves with higher resource availability (as those hidrologicaly actives) had a higher biological complexity than those with less resource. There are two types of impacts that occur in the area: the natural (geological) and the anthropic, as intense "stepping" and visitation or use of cave entrances as cattle shelters. There are caves with different preservation degrees in the area, with invertebrate communities in varied complexity states. The communities of these caves undoubtedly deserve care, since the area is extremely important in the Brazilian biospeleological context.

Animals↗
PubMed1999

Heterochromatin patterns in triatomines of the genus Panstrongylus.

Spermatogenesis was analysed by C-banding in two species of triatomines, Panstrongylus megistus and P. herreri. Both species revealed interstitial and terminal bands in the autosomes, which is a common pattern in Heteroptera. The terminal bands corroborated the hypothesis that in holocentric chromosomes the heterochromatin is preferentially located at the telomere. The sex chromosomes in P. herreri were totally heterochromatic in spermatogenesis, and in P. megistus the X chromosomes alternated between positive and negative banding.

Animals↗
PubMed2000

Isobutyric acid from the Brindley's glands of Triatoma lecticularia.

The contents of the Brindley's gland of Triatoma lecticularia (Stål) (Heteroptera: Reduviidae: Triatominae) have been identified by gas chromatography-mass spectrometry as isobutyric acid. This compound is found in similar secretions from certain other members of the Triatominae, and is suggested to play a role as a defensive pheromone and for intraspecies communication.

Animals↗
PubMedDate not supplied

[Host specificity of homoxenous trypanosomatids].

Some problems in a correct using of the term "host specificity" for parasitic protozoans and specifically for the trypanosomatids are discussed. Results of investigation the host specificity of the trypanosomatids obtained by traditional methods are summarized. Host specificity data of some insect-associated trypanosomatids based on the identification of parasites by means of molecular methods is discussed. The subjectivity is an imminent distinctive feature of host specificity investigation in parasitic protozoans--trypanosomatids, especially in parasites of insects and plants. There is a vicious circle, when the conclusions about specificity are related with the necessity of taxonomic identification of the parasites during the process of biodiversity and ecological studies. The taxonomic position of parasite is often determined based on a data of observed hosts specificity. This is quite common in cases, when reliable morphological characters are absent, and it indeed takes place in the homoxenous trypanosomatids. The using of molecular markers only allows to reliably identify and compare the parasites, without involving the properly taxonomic data, and finally to make more objective conclusions about their host specificity. A crucial question in this kind of investigation is an obtaining of adequate and wide set of laboratory cultures (isolates) correctly reflecting the diversity of the hosts. It is always necessary to take in attention a possibility of occasional infections, which could misrepresent obtained results. About 50 cultures isolated from different hosts (mostly Hemiptera: Heteroptera) and places (mostly North Russia) have been examined by means of RAPD, UP-PCR, MLEE and cross DNA hybridization. Some of them were placed in rRNA-based molecular phylogeny. As it was found out, none natural groups of homoxenous trypanosomatids (groups of similar genomes) demonstrated a clear preferential distribution on certain insect taxon of any taxonomic rank,--species, genera, family and even order. It is postulated that the host specificity of insect-associated trypanosomatids is extremely wide.

Animals↗
PubMed2003

Bioassay screening of Amazonian plants.

OBJECTIVE: The purpose of this study was to evaluate several biological activities of thirty plant extracts collected in the North West Amazon (Ecuador). Some of these plants are being used for their reputed medicinal properties by the natives of this region. METHODS: Five in vitro bioassays were used to screen the plant material. 1. The brine shrimp lethality examination (BSLT) in microplate is a general test that seems capable of detecting a broad spectrum of bioactivity present in crude plant extracts. 2. Free radical scavenging properties were studied in a colorimetric assay using 2,2-diphenyl-1-picrylhydrazyl (DPPH). 3. The beta-glucosidase inhibition test is thought to be a method for the evaluation of anti-AIDS, anti-diabetic or anti-obesity compounds. 4. The xanthine oxidase inhibition assay is used to identify potential anti-gout agents. 5. The antibacterial activity that is being used to isolate and identify antibiotic drugs. RESULTS: In the BSLT, we found that Piscidia carthagenensis demonstrated very good activity with a LC50: 21.81 micrograms/mL. It is considered that plant extracts with low LC50 values may contain metabolites with cytotoxic, antifungal, insecticidal or pesticide activities. In the antioxidant activity bioassay, several plant extracts were confirmed to have excellent free radical scavenging properties. Rhus juglandifolia and Clusia venusta leaves exhibited an ED50: 3.12 micrograms/mL and 3.61 micrograms/mL, respectively. Piper reticulatum (84%), Inga heteroptera (77%), Clusia venusta (70.9%), and Rhus juglandifolia (70.5%) showed fairly good inhibition activity for beta-glucosidase. On the other hand, none of the plant extracts was capable of inhibiting xanthine oxidase. Finally, the Gram-positive microorganisms Staphylococcus aureus and Corynebacterium diphteriae were found to be sensitive to the majority of the plant extracts, whereas the Gram-negative bacteria Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris, and Salmonella typhi were proved to be resistant toward the plant extracts. CONCLUSIONS: It is important to continue investigating our plant kingdom, especially the world tropical reserves as an alternative for finding new or better drugs. It should be essential to follow-up this type of investigation to isolate and elucidate the active principles of the bio-positive plants.

Animals↗
PubMed2003

Laboratory and field evaluations of novaluron, a new insect growth regulator (IGR), against Culex mosquitoes.

Limited laboratory and field studies have indicated that the insect growth regulator (IGR) novaluron exhibits good activity against larvae of pest species in the orders Coleoptera, Hemiptera (suborder Heteroptera), and Lepidoptera by both ingestion and contact. We completed laboratory and field studies to evaluate activity and efficacy of novaluron against Culex mosquitoes. In laboratory studies, novaluron was highly active against Cx. quinquefasciatus, as indicated by low levels of inhibition of emergency (IE), at the 50% level, IE50 (0.159 ppb for 2nd-stage larvae and 0.118 ppb for 4th-stage larvae) and IE90, at the 90% level, (0.604 ppb for 2nd-stage larvae and 0.595 ppb for 4th-stage larvae). In outdoor microcosm and mesocosm studies against natural populations, novaluron yielded excellent control of immature Culex mosquitoes for up to 14 days at 1.25, 2.5, and 5 ppb in microcosms, and for up to 7 days at the dosages of 1, 5, and 10 mg/m2 in mesocosms. Based on qualitative observations, novaluron seemed to have a favorable margin of safety for nontarget aquatic invertebrates cohabiting with mosquito larvae. Further large-scale field studies are warranted to evaluate initial efficacy and longevity of novaluron against various mosquito species, as well as its safety for nontarget biota.

Animals↗
PubMed2003

Insect fauna associated with sugarcane plantations in Sri Lanka.

A survey conducted over 13 years (1986-1999) in sugarcane plantations in Sri Lanka to identify insects associated with sugarcane recorded a total of 103 insect species comprising Coleoptera (31 spp.), Dictyoptera (2 spp.), Diptera (5 spp.), 12 Heteroptera (12 spp.), Homoptera (18 spp.), Hymenoptera (7 spp.), Isoptera (3 spp.), Lepidoptera (13 spp.), Orthoptera (9 spp.), and one species each of Thysanoptera, Nuroptera and Trichoptera. Among them were forty-six species of sugarcane pests. In addition, 27 species of natural enemies of sugarcane pests belonging to the orders Coleoptera, Diptera and Hymenoptera were identified Epiricania melanoleuca (Fletcher) introduced into Sri Lanka from Pakistan in 1991 for the control of the sugarcane planthopper was also recorded. Five new pest species previously not recorded from sugarcane in Sri Lanka have been identified.

Agriculture↗
PubMed2004

Differentiation and morphogenesis of Triatoma infestans (Klug 1834) female gonads. I--post embryonic development.

The post-embryonic development of the female gonads in Triatoma infestans (Hemiptera, Heteroptera), insects of importance in health affairs as harbors and vectors of different tripanosomatidea flagellates, is presented in a complete follow-up since insect hatches from the egg up to the last molt in the fifth instar stage. The detailed description of the morphological changes which occur in each instar as well as careful measurements evaluating its size increase have been analyzed by stereomicroscopy, phase contrast, dark field, and oblique illumination, in order to optimize the observations as well the photographic register of gonad morphology and structure. The analysis was performed on gonad specimens obtained from broods no less than twenty (20) nymph bugs, reared at constant temperature and fed-up regularly. According to the results of our study we can assert that gonad differentiation takes place in early phases of the insect development. Such is the case that first instars nymph's present absolutely and easily recognizably male and female gonads. From the third instar on beside the filament region, the three zones in each ovariole body is distinguished, a differentiation that is more noticeable during the fourth instar where a definite organization is present at the vitelarium. Such a clear cut zone development continues intensively during the fifth instar. Finally at the end of such fifth nymph stage and when the last molt toward adults is prepared, clear signs of ovariole maturation take place since oocytes in early vitelogenesis are found.

Animals↗
PubMed2005

A amylase activity of nymphal stages of sunn pest, Eurygaster integriceps Puton (Hemiptera: Scutelleridae).

Wheat production in Iran has changed substantially over the past one or two decades with development of higher-yielding cultivars and improved methods of planting. Sunn pest, Eurygaster integriceps (Heteroptera: Pentatomidae), is the most important cereal pest in Iran. Sunn pest like other insect pests of wheat lives on a polysaccharide-rich diet and depends to a large extent on effectiveness of their alpha-amylases for survival. alpha-amylase (1-4-alpha-D-glucan glucanohydrolase) hydrolyses starch, and related polysaccharides by randomly cleaving internal alpha-1,4-glucosidic linkages and has a major role in the utilization of polysaccharides. The recent increase in study of insect digestive enzymes seems to make sense in the realization that the gut is the major interface between the insect and its environment. Hence, an understanding of digestive enzyme function is essential when developing methods of insect control such as the use of enzyme inhibitor's and transgenic plants to control phytophagous insects. The aim of the current study is to identify and characterize alpha-amylase activity in order to gain a better understanding of its digestive physiology, which hopefully will lead to new strategies of the insect control. In order to analyze a-amylase activity adult and different nymphal stages were collected from wheat field from Karaj area and midgut complex from these individuals were dissected under a light microscope in ice-cold saline buffer (0.006M NaCl). After homogenization in buffer, homogenate was centrifuged at 15000 g for 20 min at 4 degrees C. The supernatant was pooled and stored at -20 degrees C for subsequent analysis. alpha-amylase activity was assayed by the dinitrosalicylic acid (DNS) procedure using soluble starch as substrate (starch 1%). Our result showed that enzyme activities in different nymphal stages (first, second, third, fourth and fifth stadium) were 0.19, 0.78, 1.21, 1.23, 1.25 units/mg protein, respectively.

Animals↗