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Chiapa de Corzo, Mexico

Jourdie V.,University of Neuchatel | Jourdie V.,University of Manchester | Alvarez N.,University of Neuchatel | Molina-Ochoa J.,University of Colima | And 5 more authors.
Molecular Ecology | Year: 2010

Plant chemistry can strongly influence interactions between herbivores and their natural enemies, either by providing volatile compounds that serve as foraging cues for parasitoids or predators, or by affecting the quality of herbivores as hosts or prey. Through these effects plants may influence parasitoid population genetic structure. We tested for a possible specialization on specific crop plants in Chelonus insularis and Campoletis sonorensis, two primary parasitoids of the fall armyworm, Spodoptera frugiperda. Throughout Mexico, S. frugiperda larvae were collected from their main host plants, maize and sorghum and parasitoids that emerged from the larvae were used for subsequent comparison by molecular analysis. Genetic variation at eight and 11 microsatellites were respectively assayed for C. insularis and C. sonorensis to examine isolation by distance, host plant and regional effects. Kinship analyses were also performed to assess female migration among host-plants. The analyses showed considerable within population variation and revealed a significant regional effect. No effect of host plant on population structure of either of the two parasitoid species was found. Isolation by distance was observed at the individual level, but not at the population level. Kinship analyses revealed significantly more genetically related - or kin - individuals on the same plant species than on different plant species, suggesting that locally, mothers preferentially stay on the same plant species. Although the standard population genetics parameters showed no effect of plant species on population structure, the kinship analyses revealed that mothers exhibit plant species fidelity, which may speed up divergence if adaptation were to occur. © 2010 Blackwell Publishing Ltd. Source

Salazar-Vallejo S.I.,ECOSUR | Buzhinskaja G.,Russian Academy of Sciences
ZooKeys | Year: 2011

Diplocirrus Haase, 1915, includes flabelligerids having cylindrical to club-shaped bodies, with cirriform papillae, multiarticulate chaetae in both parapodial rami, 8 branchial filaments of two types (thick and rarely lamellate, or cirriform), gonopodial lobes in chaetigers 5 or 6, or multiple gonopores along some anterior chaetigers. Bradiella Rullier, 1965, has included only the type species: B. branchiata Rullier, 1965, described from Eastern Australia. The original description has been overlooked and it lacked enough details on branchial and chaetal features. Diversibranchius Buzhinskaja, 1993, with D. nicolaji Buzhinskaja, 1994, as the type species, was introduced for a similar species from the Japan Sea. These two monotypic genera share the same morphologic features with Diplocirrus, and are herein regarded as its junior synonyms. As herein redefined, Diplocirrus includes, besides its type species, D. glaucus (Malmgren, 1867) from Scandinavia: D. branchiatus (Rullier, 1965), comb. n. from Queensland, Australia, D. capensis Day, 1961 from South Africa, D. erythroporus Gallardo, 1968 from Vietnam, D. hirsutus (Hansen, 1882) from Arctic and subarctic regions, D. incognitus Darbyshire & Mackie, 2009 from South Africa, D. kudenovi sp. n. from off Western Mexico, D. longisetosus (von Marenzeller, 1890) restricted to the Bering Sea, D. micans Fauchald, 1972 from deep water off Oregon and Western Mexico, D. nicolaji (Buzhinskaja, 1994), comb. n. from the Japan Sea, D. normani (McIntosh, 1908), comb. n. from Scandinavia, D. octobranchus (Hartman, 1965), comb. n. from off New England, and D. stopbowitzi Darbyshire & Mackie, 2009 from the Irish Sea. © Sergio I. Salazar-Vallejo, Galina Buzhinskaja. Source

Brown J.D.,University of Georgia | Luttrell M.P.,University of Georgia | Uhart M.M.,Wildlife Conservation Society | Del Valle Ferreyra H.,Wildlife Conservation Society | And 3 more authors.
Journal of Wildlife Diseases | Year: 2010

Limited information exists on avian influenza (AI) virus infection in South American wild birds. As part of a national surveillance program in Argentina, indigenous waterbirds were screened for antibodies to AI virus. From November 2006 to July 2007, serum samples from 540 waterbirds of 12 species were tested for type-specific antibodies to AI virus with the use of a commercially available blocking enzyme-linked immunosorbent assay (bELISA) and the agar-gel immunodiffusion (AGID) test. Thirty-three percent (176/540) of serum samples were positive with the bELISA and 12% (64/540) were positive with the AGID test. The bELISA detected antibodies to AI virus in eight of the 12 species, and the AGID detected positives in only five species. These results provide insight into AI virus circulation in Argentinean waterbirds and preliminary data to guide further surveillance efforts. © Wildlife Disease Association 2010. Source

Karhan S.U.,Istanbul University | Simboura N.,Hellenic Center for Marine Research | Salazar-Vallejo S.I.,ECOSUR
Mediterranean Marine Science | Year: 2012

A new species of flabelligerid polychaete, Flabelliderma cinari, is described from the Turkish coast of the Eastern Mediterranean Sea. This represents the first occurrence of the genus Flabelliderma in the Mediterranean. Flabelliderma cinari sp. nov. is closely allied to F. claparedei in having dorsal tubercles of two different sizes; however, these species differ in the relative shape and number of dorsal tubercles, the number of capillaries per fascicle in the notopodia and the shape of the curved distal articles in the neuropodial hooks. Source

Marina C.F.,Centro Regional Of Investigacion En Salud Publica | Bond J.G.,Centro Regional Of Investigacion En Salud Publica | Casas M.,Centro Regional Of Investigacion En Salud Publica | Munoz J.,Centro Regional Of Investigacion En Salud Publica | And 3 more authors.
Pest Management Science | Year: 2011

Background: Field trials were conducted during the wet and dry seasons in periurban and semi-rural cemeteries in southern Mexico to determine the efficacy of a suspension concentrate formulation of spinosad (Tracer 480SC) on the inhibition of development of Aedes albopictus L. and Ae. aegypti Skuse. For this, oviposition traps were treated with spinosad (1 or 5 mg L-1), Bacillus thuringiensis israelensis (Bti, VectoBac 12AS), a sustained release formulation of temephos and a water control. Results: Ae. albopictus was subordinate to Ae. aegypti during the dry season, but became dominant or codominant during the wet season at both sites. The two species could not be differentiated in field counts on oviposition traps. Mean numbers of larvae + pupae of Aedes spp. in Bti-treated containers were similar to the control at both sites during both seasons. The duration of complete absence of aquatic stages varied from 5 to 13 weeks for the spinosad treatments and from 6 to 9 weeks for the temephos treatment, depending on site, season and product concentration. Predatory Toxorhynchites theobaldi Dyar and Knab suffered low mortality in control and Bti treatments, but high mortality in spinosad and temephos treatments. Egg counts and percentage of egg hatch of Aedes spp. increased significantly between the dry and wet seasons, but significant treatment differences were not detected. Conclusion: Temephos granules and a suspension concentrate formulation of spinosad were both highly effective larvicides against Ae. aegypti and Ae. albopictus. These compounds merit detailed evaluation for inclusion in integrated control programs targeted at Ae. aegypti and Ae. albopictus in regions where they represent important vectors of human diseases. © 2010 Society of Chemical Industry. Source

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