Abstract Objective This study aimed to reveal the mitochondrial genomes (mtgenomes) of Tetrix japonica and Alulatettix yunnanensis, and the phylogenetics of Orthoptera species. Methods The mtgenomes of A. yunnanensis and T. japonica were firstly sequenced and assembled through partial sequences amplification, and then the genome organization and gene arrangement were analyzed. Based on nucleotide/amino acid sequences of 13 protein-coding genes and whole mtgenomes, phylogenetic trees were established on 37 Orthoptera species and 5 outgroups, respectively. Results Except for a regulation region (A+T rich region), a total of 37 genes were found in mtgenomes of T. japonicaand A. yunnanensis, including 13 protein-coding genes, 2 ribosomal RNA genes, and 22 transfer RNA genes, which exhibited similar characters with other Orthoptera species. Phylogenetic tree based on 13 concatenated protein-coding nucleotide sequences were considered to be more suitable for phylogenetic reconstruction of Orthoptera species than amino acid sequences and mtgenomes. The phylogenetic relationships of Caelifera species were Acridoidea and Pamphagoidea > Pyrgomorphoidea > Pneumoroidea > Eumastacoidea > Tetrigoidea > Tridactyloidea. Besides, a sister-group relationship between Tettigonioidea and Rhaphidophoroidea was revealed in Ensifera. Conclusion Concatenated protein-coding nucleotide sequences of 13 genes were suitable for reconstruction of phylogenetic relationship in orthopteroid species. Tridactyloidea was a sister group of Tetrigoidea in Caelifera, and Rhaphidophoroidea was a sister group of Tettigonioidea in Ensifera.

O Rio Xingu possui um grande potencial hidrelétrico, especificamente na região da Volta da Grande, onde será instalada a Hidrelétrica de Belo Monte. Para a implementação desse empreendimento, foi necessário o estudo de impacto ambiental, considerando a fauna, flora e os aspectos sociais. Com o objetivo de realizar a análise faunística das espécies de gafanhotos da Área de Influência Direta do Empreendimento Belo Monte, realizou-se um inventário, utilizando-se rede entomológica no período de novembro/2007 a agosto/2008. Foram coletados 2652 gafanhotos pertencentes a três famílias, 10 subfamílias, 18 tribos, 42 gêneros e 71 espécies. A análise faunística evidenciou que 74% das espécies foram consideradas raras ou mínimas e, quanto à constância, 54,9% destas foram classificadas como acidentais. Os maiores índices de diversidade e de riqueza dos gafanhotos ocorreram na área A2, que será inundada para formar o lago da hidrelétrica, o que poderá causar extinção local dessas espécies

The Xingu River has a huge hydroelectric potential, specifically in the Volta Grande, where the hydroelectric power station of Belo Monte will be installed. For the implementation of this construction project an environmental impact study was necessary, considering the fauna, flora and the social aspects. In order to perform the faunistic analysis of grasshoppers species in the area of direct influence of the construction project of Belo Monte, an inventory was carried out using entomological nets from November/2007 to August/2008. It was collected 2652 grasshoppers, which belonged to 3 families, 10 subfamilies, 18 tribes, 42 genera and 71 species. The faunistic analysis demonstrated that 74% of the species were classified as rare or minimal and with regard to constancy 54.9% were classified as accidental. The highest levels of diversity and richness of grasshoppers occurred in the area A2 that will be flooded to form the hydroelectric lake, which may cause local extinction of these species

Se analiza la trayectoria académica y profesional del Prof. Dr. Ricardo Arturo Ronderos (19281995), quien fuera Presidente de la Sociedad Entomológica Argentina (SEA) (19641979) y Director de su publicación periódica (RSEA) (19681985). Se incluyen sus principales aportes a la entomología y, en menor grado, a otros campos de las ciencias naturales, desarrollados durante cuatro décadas de actividad ininterrumpida (19541994). Se destaca su actuación en la formación de recursos humanos, en la organización de sociedades científicas y en el asesoramiento a organismos nacionales e internacionales de promoción científica, especialmente aquellas relacionadas con la evaluación ambiental de proyectos de infraestructura y sus impactos ambientales en macrosistemas acuáticos de Argentina, Paraguay y Uruguay.

We analyze the academic and professional career of Prof. Dr. Ricardo Arturo Ronderos (19281995) Past President of the "Sociedad Entomológica Argentina" (SEA) (19641979) and Director of its journal (RSEA) (19681985). His main achievements and contributions to entomology as well as to other fields of the natural sciences are referred taking into account his academic and professional activities carried on during four decades (19541994). We also remark his dedication to the training of young researchers, organization of scientific societies, advice to national institutions of science promotion and international entities, mainly those dealing with environmental assessments of projects affecting aquatic macrosystems of Argentina, Paraguay and Uruguay.

Un estudio de la fauna de acrídidos en diferentes hábitats y regiones del estado de Haryana se llevó a cabo durante el período comprendido entre 2009 y 2011. Treinta y seis especies fueron colectadas pertenecientes a veintitrés géneros y ocho subfamilias. Oedipodinae (28%) fue la subfamilia más dominante. Spathosternum prasiniferum prasiniferum (Walker, 1871) es la especie más abundante.

A survey of Acridid fauna in totally different habitats in different regions of Haryana state was carried out during the period from 2009 to 2011. Thirty six species were captured belonging to twenty three genera and eight subfamilies. Oedipodinae (28%) was the most dominant subfamily. Spathosternum pradniferum pradniferum (Walker, 1871) was found to be most abundant.

In Argentina, the grasslands of Pampas region comprise approximately 15% of the country. As in other grasslands of the world, grasshoppers are among the most important native herbivores. Their economic importance has been recognized in Argentina since the mid to late nineteenth century, since outbreaks of different species have become recurrent phenomena. Therefore, the main objective of this work was to study their diversity and distribution in grasslands of the Southern Pampas region (Laprida county, Buenos Aires province), as one of the most affected areas. The study was conducted during five seasons (2005-10). Sampling sites were represented by the most common plant communities in this area, classified in four categories: native grasslands, disturbed grasslands, implanted pastures and halophilous grasslands. The samplings were conducted from mid-spring to early autumn, with five or six samples per season. We estimated the following population descriptors: species richness (S), eveness (E), dominance (J), and diversity index (H´). In order to evaluate the similitude of the grasshopper communities present in the different plant communities, we used qualitative and quantitative coefficients of similitude. A total of 22 species of grasshoppers were collected, of which 21 belong to the family Acrididae. The subfamily Melanoplinae was the most diverse with eight species. The largest species richness was recorded in native grasslands (18). The different communities of grasshoppers had similar indices of evenness and dominance (p>0.05). Considering all plant communities, the average value of Shannon-Wiener index was 1.58±0.075. There was a positive correlation between evenness index and species richness (p<0.05). The diversity index H’ was different between plants communities (p<0.05), and it was higher in the disturbed grassland (1.75±0.096, p<0.05) than in the halophilous grasslands (1.34±0.12). Native and disturbed grasslands had a higher plant richness than halophilous grasslands and implanted pastures (p<0.05). There was a positive relationship between plant richness and grasshoppers species richness, and diversity of grasshoppers. According to the qualitative indices applied, the similitude between different grasshopper communities was higher than 60%. In general, the species that had a higher frequency of occurrence showed greater abundance and distribution. Covasacris pallidinota, Dichroplus elongatus, D. maculipennis, Borellia bruneri and B. pallid were the most widely distributed species, most of them (12) showed a restricted distribution and few (five) an intermediate distribution.

Los acridios son componentes nativos de los pastizales, dichos sistemas han sido modificados debido a la intensificación de las actividades agrícola-ganaderas y por lo tanto se considera importante estudiar las comunidades de acridios asociadas. Se estudió la diversidad y distribución de acridios en el Sur de la región pampeana a través de muestreos realizados en las comunidades vegetales más representativas del partido de Laprida, provincia de Buenos Aires, durante cinco temporadas (2005-2010). Se recolectaron 22 especies. La subfamilia Melanoplinae fue la más diversa (ocho especies). La mayor cantidad de especies se observó en los pastizales nativos (18). La diversidad en los pastizales alterados (1.75±0.096) fue superior (p<0.05) a la de los pastizales halófilos (1.34±0.12). La riqueza de plantas en los pastizales nativos y los pastizales alterados fue superior (p<0.05) a la de las demás comunidades. Se registro una relación positiva entre la riqueza de plantas y las variables riqueza y diversidad de acridios. La similitud entre las comunidades de acridios estimada por los índices cualitativos fue superior al 60%. En general, las especies que tuvieron una mayor frecuencia de aparición, mostraron una mayor abundancia y distribución. Covasacris pallidinota, Dichroplus elongatus, D. maculipennis, Borellia bruneri y B. pallida fueron las de mayor distribución, cinco especies tuvieron una distribución intermedia y la mayoría (12) una distribución restringida.

Se caracterizó la comunidad de acridomorfos (Orthoptera) a través del análisis faunístico y se determinó el tamaño ideal de muestras, en dos áreas del municipio de São Sepé, RS - Brasil. Los ejemplares fueron obtenidos con el auxilio de una red de recolección, siendo recorridas distancias de 5, 10, 15, 20 y 25 m, a fin de verificar cuál sería la mejor distancia para la colecta de acridomorfos. Las recolecciones fueron realizadas entre enero y mayo de 2009. El cálculo de diversidad fue evaluado a través de los índices de dominancia de Simpson, diversidad de Shannon-Wiener, riqueza de Margalef y equidad de Pielou. Los datos fueron analizados mediante un test no paramétrico de distribución libre chi-cuadrado. El material recolectado representó, 947 acrídidos y 20 proscópidos distribuidos en dos superfamilias,12 géneros y 23 especies. Las especies que presentaron índices elevados de dominio, abundancia, frecuencia y constancia fueron para el área A: Dichroplus silveiraguidoi, Notopomala glaucipes y Scotussa cliens, todas pertenecientes a la familia Acrididae. Para el área B, ocho especies presentaron índices significativos Aleuas vitticollis, Amblytropidia sola, Dichroplus conspersus y Dichroplus silveiraguidoi de la familia Acrididae. El mejor tamaño de muestra en términos de precisión estadística fue para 5 m de distancia recorrida. A partir de 25 m se obtuvo el mayor número de individuos y diversidad de especies, pero presentó una elevada desviación estándar y variación. De esta manera, ambos tamaños pueden ser recomendados para la obtención de acridomorfos, dependiendo del objetivo del estudio.

The research aimed to characterize the community of Acridomorphs through faunal analysis, and to determine the ideal sample size for studies with this group, in two areas from municipality of São Sepé, RS, Brazil. The specimens were collected by sweep netting, travelling distances of 5, 10, 15, 20 and 25 m, in order to determine which would be the best distance for collecting of acridomorphs. The collections were done between January and May 2009. The calculation of the values of diversity indexes was assessed using the Simpson dominance (D), Shannon-Wiener diversity (H), Margalef richness, and equitability (J’). Data were analyzed by a nonparametric free distribution chi-square test. The collected material represented 947 acridid and 20 proscopids distributed in two superfamilies, 12 genera and 23 species. The species that had high levels of significance in area A were: Dichroplus silveiraguidoi, Notopomala glaucipes and, Scotussa cliens, all Acrididae. In area B, eight species showed significant rates Aleuas vitticollis, Amblytropidia sola, Dichroplus conspersus and Dichroplus silveiraguidoi, all Acrididae. In terms of statistical precision, according to the size of a sample to collect, it was 5 m. The best sample size in terms of statistical precision was 5 m for distance traveled. Starting from 25 m, the greatest number of individuals and species diversity was obtained, but showed a high standard deviation and variance. In this way, both size can be recommended for collecting acridomorphs, depending on the purpose of the study.

Los acridios figuran entre los invertebrados herbívoros dominantes en la mayoría de los sistemas de pastizal. Si bien, en Argentina, la importancia económica de estos insectos ha sido reconocida desde el siglo XIX, aún se desconocen aspectos importantes de la biología y ecología de la mayoría de las especies. El objetivo principal de este estudio fue determinar cómo la riqueza de especies, la composición y la densidad de acridios variaron en las comunidades vegetales más características del Sur de la provincia de Buenos Aires, durante cinco temporadas sucesivas (2005-06 hasta 2009-10), un área históricamente afectada por estos insectos. Se colectó un total de 22especies. La riqueza de acridios fue similar entre las diferentes comunidades vegetales, observándose una disminución significativa de la misma durante la última temporada de muestreo. La densidad total de acridios aumentó significativamente en todas las comunidades vegetales durante el estudio, alcanzando niveles de explosión poblacional (“outbreak”) en las últimas dos temporadas. En la de 2009-10, la densidad fue ocho veces mayor que en 2005-06. Las especies que más aportaron a este aumento en la densidad fueron Dichroplus maculipennis (Blanchard) y Borellia bruneri (Rehn). Dichroplus maculipennis resurgió como el acridio plaga más perjudicial en la región Pampeana, con el desarrollo de un “outbreak” de magnitud histórica, se registraron, en algunos sitios, densidades de hasta 75 ind/m².

Grasshoppers are among the dominant invertebrate herbivores in most grassland habitats. The economic importance of grasshoppers has been recognized in Argentina since the XIX century, but many aspects of the biology and ecology of most species remain unknown. The main objective of this study was to determine how grasshopper species richness, composition, and density varied among characteristic plant communities during five successive seasons (2005-06 to 2009-10) in grasslands of the southern Buenos Aires province, an area historically affected by these insects. Twenty two species were collected. Grasshopper species richness was similar between different plant communities and showed a significant decrease in the final year of sampling. The overall density increased significantly in all plant communities during the study, reaching outbreak levels in the last two seasons. Density was over eight times higher in 2009-10 than in 2005-06. The greatest contribution to the increase in density observed was by Dichroplus maculipennis (Blanchard) and Borellia bruneri (Rhen). Dichroplus maculipennis re-emerged as the most serious grasshopper pest in the Pampas, developing an outbreak of historical magnitude that included high densities of up to75 ind/m².

Gafanhotos (Orthoptera, Acridoidea) em áreas de cerrados e lavouras na Chapada dos Parecis, Estado de Mato Grosso, Brasil. Foi determinada a composição e abundância de espécies de gafanhotos usando amostragem com rede entomológica durante 3 anos de estudo na Chapada dos Parecis, estado de Mato Grosso. O levantamento foi feito em áreas de lavouras e com vegetação ainda nativa (cerrados) com, respectivamente, 56 e 59 locais inventariados em cada ambiente. Foram coletados 3.031 indivíduos de gafanhotos de 64 espécies distribuídas entre as famílias e subfamílias: Acrididae (49): Gomphocerinae (21), Ommatolampinae (10), Melanoplinae (6), Acridinae (4) Leptysminae (3), Copiocerinae (3), Proctolabinae (1) e Cyrtacanthacridinae (1); Romaleidae (1): Romaleinae (13) e Ommexechidae (1): Ommexechinae (2), além de 1550 ninfas. A diversidade de espécies foi maior no cerrado (61) do que nas lavouras (16), ocorrendo o inverso com relação à abundância onde as espécies Baeacris punctulatus (Thunberg, 1824) e Orphulella punctata (De Geer, 1773) predominaram representando 49,5% do total de indivíduos coletados em toda a Chapada dos Parecis e, juntas, somam 78,8% da abundância registrada nas áreas de lavouras e tem potencial de se tornarem pragas.

Grasshoppers (Orthoptera, Acridoidea) in native savanna and crop areas in Chapada dos Parecis, Mato Grosso State, Brazil. We determined the composition and abundance of grasshoppers using sweep net sampling during three years at the Parecis Plateau, State of Mato Grosso, Brazil. The survey was done in areas with crops and native vegetation (savanna) with, respectively, 56 and 59 sites available in each environment. 3.031 individuals of grasshoppers were collected from 64 species distributed among the following families and subfamilies: Acrididae (49): Gomphocerinae (21), Ommatolampinae (10), Melanoplinae (6), Acridinae (4) Leptysminae (3), Copiocerinae (3), Proctolabinae (1) and Cyrtacanthacridinae (1); Romaleidae (1): Romaleinae (13) and Ommexechidae (1): Ommexechinae (2) and 1550 nymphs. The differences were significant between the number of species found in the savannas (61) and in cultived areas (16). However, the abundance of Acridoidea was significantly higher in crops than in savannas areas which was influenced mainly by two Acrididae's species: Baeacris punctulatus (Thunberg, 1824) and Orphulella punctata (De Geer, 1773) which accounted for 49.5% of the total individuals collected across the Parecis Plateau and, together, they account for 78.8% of recorded abundance in the cultived areas, both species being potential pests.

Se realizó un inventario de enemigos naturales del chapulín (Orthoptera: Acridoidea) como resultado de observaciones hechas a través de la exploración, muestreos de ootecas, ninfas y adultos que se llevaron a cabo de 2002 a 2007 en 11,242 ha de 101 comunidades de 11 municipios del sur del Estado. Se examinaron 1620 ootecas y 8122 chapulines identificando tres especies de hongos entomopatógenos, un parasitoide y cinco depredadores. Se encontraron larvas de Epicauta spp. (Coleoptera: Meloidae) depredando ootecas de Melanoplus differentialis Thomas (Orthoptera: Acridoidea) y dos aves, Mimus polyglottos L. y Toxostoma curvirostre Swainson (Passeriformes: Mimidae) alimentándose de estadios ninfales o adultos de especies pequeñas. Se observaron estadios ninfales en la telaraña de Neoscona spp. (Araneae: Araneidae). Un depredador muy activo de ninfas pequeñas en las horas mas calientes del día fue el "moscón" Efferia spp. (Diptera: Asilidae). Se encontró a Sarcophaga spp. (Diptera: Sarcophagidae) en M. differentialis como huésped. Se observaron tres especies de hongos, Beauveria bassiana Balsamo (Hypocreales: Cordycipitaceae), Metharizium anisopliae Metschnikoff (Hypocreales: Clavicipitaceae) en todos los estadios y Entomophaga grylli Fresenius (Entomophthorales: Entomophthoraceae) en adultos de M. differentialis como hospedero, ocasionando epizootias con un buen nivel de infección.

We performed an inventory of natural enemies of grasshopper (Orthoptera: Acridoidea) as a result of observations made through exploration, sampling of egg pods, nymphs and adults were conducted from 2002 to 2007 in 11,242 ha of 101 communities in 11 municipalities of Southern Queretaro. 1620 egg pods were reviewed and 8122 grasshoppers; three species of entomophatogenis were identified, a parasitoid and five predators. Epicauta spp. (Coleoptera: Meloidae) larvae were found preying egg pods of Melanoplus differentialis Thomas (Orthoptera: Acridoidea) and two birds, Mimus polyglottos L. and Toxostoma curvirostre Swainson (Passeriformes: Mimidae) feeding nymphs or adults of small species. Nymphs were observed in the web of Neoscona spp. (Araneae: Araneidae). A very active predator of small nymphs during the hottest hours of the day was the blowfly Efferia spp. (Diptera: Asilidae). We found Sarcophaga spp. (Diptera: Sarcophagidae) in M. differentialis as a host. There were three species of fungus, Beauveria bassiana Balsamo (Hypocreales: Cordycipitaceae), Metharizium anisopliae Metschnikoff (Hypocreales: Clavicipitaceae) in all stages and Entomophaga grylli Fresenius (Entomophthorales: Entomophthoraceae) in adults of M. differentialis as a host, causing epizooties with a good level of infection.

Esta contribución registra por primera vez la subfamilia Proctolabinae para la Argentina. La subfamilia Proctolabinae contiene 29 géneros y 209 especies restringidas a la región Neotropical, con sólo uno de sus géneros, Eucephalacris Descamps, que llega al sur hasta Mato Grosso en Brasil y el norte de Paraguay. Ejemplares pertenecientes a Eucephalacris borellii (Giglio-Tos) fueron colectados en el departamento de Guaraní, provincia de Misiones. La presencia de Eucephalacris borellii, registrada en este trabajo, eleva a once el número de subfamilias de Acrididae presentes en la Argentina, y destaca la necesidad de realizar relevamientos sobre la diversidad de Acridoidea y de Orthoptera en general, en diversas regiones de nuestro país. También se brindan en esta contribución una breve diagnosis e ilustraciones de los caracteres que permiten la identificación del género y de la especie.

This contribution records for the first time the subfamily Proctolabinae from Argentina. This subfamily contains 29 genera and 209 species restricted to the Neotropics with only one genus, Eucephalacris Descamps, reaching south as far as Mato Grosso in Brazil and northern Paraguay. Specimens belonging to Eucephalacris borellii (Giglio-Tos) were collected in Misiones province. The presence of this species registered herein raises to eleven the number of Acrididae subfamilies known to occur in the country, and highlights the importance of conducting surveys of Acridoidea and Orthoptera in general, in diverse regions of Argentina. Brief diagnoses and illustrations of the characters that allowed the identification of the genus and species are also given in this contribution.

Los acridios (tucuras y langostas) continúan ocasionando pérdidas económicas en la agricultura a nivel mundial. En Argentina, la importancia de estos insectos ha sido reconocida desde mediados del siglo XIX, dependiendo de la región considerada y en relación al progresivo desarrollo agropecuario en el país. Los hongos son los microorganismos parásitos de insectos más frecuentemente encontrados en la naturaleza y la mayoría de las investigaciones con hongos entomopatógenos se ha centrado en su desarrollo como bioplaguicidas. En el presente trabajo se dan a conocer cinco registros nuevos de Beauveria bassiana (Bals.-Criv.) Vuill., y dos de Entomophaga grylli (Fresen.) A. Batko que se encontraron afectando distintas especies de acridios; se amplía así la distribución geográfica y el espectro hospedador para estas especies fúngicas. Cabe destacar que con el aporte de estos siete registros nuevos, el número total de hongos entomopatógenos de acridios citados para la República Argentina se eleva de 22 a 29.

Grasshoppers and locusts continue causing serious economic losses in agriculture worldwide. In Argentina, the importance of these insects has been recognized since the mid-nineteenth century, depending on the region considered and in relation to the progressive development of agriculture. Fungi are the most frequently found microorganisms parasitizing insects in nature, and most of the entomopathogenic fungi investigations have been focused on their development as biopesticides. In this study five new records of Beauveria bassiana (Bals.-Criv.) Vuill., and two new records of Entomophaga grylli (Fresen.) A. Batko, are presented, extending the geographical distribution and the host range for these fungal species. With these seven new records, the total number of grasshopper entomopathogenic fungi cited for Argentina is raised from 22 to 29.

La Colección de Invertebrados del Museo Paraense Emílio Goeldi (MPEG) es secular y contiene 494 ejemplares de saltamontes Romaleidae. En este trabajo se presentan 11 especies que constituyen nuevos registros para el Brasil, la Región Amazónica, los estados brasileros de Acre, Mato Grosso, Pará y Tocantins.

The Invertebrate Collection of the Paraense Emílio Goeldi Museum (MPEG) is century-old and holds 494 specimens of Romaleidae grasshoppers. This work presents 11 species that constitute new records for Brazil, the Amazon Region and the Brazilian states of Acre, Mato Grosso, Pará and Tocantins.

We analysed the abundance of grasshoppers through forage resources within a farm. Four types were considered: legumes pasture (with and without grazing), grass pasture and soybean. Two operators performed the sampling with net, between November and April (8 lines/plot: 4 in their edges, 4 inside). They were compared in total abundance by means of ANVA (DBA) and Tukey. In a Split-Plot designed location (higher plot) and Operator (small plot) by means of ANVA and DGC. Tettigoniidae dominated in grasses (>90%), and had no relevance (<5%) in soybean. Acrididae (true grasshoppers) dominated (>90%) in soybean and were the most important in legume pasture (>60%) while the Tettigoniidae (30%) was the second. Those with the highest abundance in first generation in legume pasture and grasses were D. punctulatus and a Tettigoniidae. In the second generation, two Gomphocerinae (Acrididae) were the most important. In soybean, the highest abundance in January was because of juvenile forms and in February was because of adults (R. (Dichroplus) bergi, a Gomphocerinae and D. punctulatus). In grasses and legume pastures, the same species trended to dominate as adults and juveniles; although it did not happen in soybean. That Tettigoniidae very abundant in grasses, were also in high numbers in legume pastures, but almost did not appear in soybean. However, if that species would require high levels of forage in legume pasture, it could force the dominant Acridoidea there, to move to the soybean. In edges of plots were detected high densities only related with certain kind of neighbours: a similar resource with high densities or non-removed areas (roads and water canals). When considering all edges with the same plot, this effect was diluted and there was not difference between them and the centre of the plot. Differences between operators were not detected.

Se analizó la abundancia de tucuras a través del mosaico de recursos de un establecimiento agrícola-ganadero. Considerando cuatro recursos: pastura (con y sin pastoreo), pastizal y soja, dos operadores llevaron a cabo muestreos mediante red, entre noviembre y abril (8 transectas/parcela, 4 en bordes, 4 en centro). Se comparó la densidad total mediante ANVA (DBA) y Tukey. En un diseño de parcela dividida se consideraron: Posición (parcela mayor) y Operadores (parcela menor) mediante ANVA y DGC. En el pastizal predominaron (>90%) los Tettigoniidae (saltamontes), sin relevancia (<5%) en la soja. Los Acrididae (tucuras verdaderas) predominaron (>90%) en la soja y fueron más importantes en la pastura (>60%) respecto de los Tettigoniidae (30%). Los más abundantes en la primera generación, en la pastura y pastizal fueron D. punctulatus y un Tettigoniidae (Ensifera). En la segunda, dominaron dos Gomphocerinae (Acrididae). Para la soja, el máximo de enero correspondió a los juveniles y la alta densidad de febrero correspondió a los adultos (R. (Dichrolplus) bergi, un Gomphocerinae y D. punctulatus). En pastizales y pasturas, las mismas especies dominaron las capturas como adultos y juveniles, lo que no sucedió en la soja. El Tettigoniidae con alta abundancia en el pastizal, invadió las pasturas, pero no la soja. Si su migración produce una alta demanda de forraje en las pasturas, podría forzar a los Acridoidea predominantes en pasturas y soja, a migrar hacia ésta. En los bordes se detectó una mayor densidad a partir de un vecino riesgoso como fuente de infestación: un recurso similar en aquellos con alta densidad o las áreas sin remoción (caminos o canales). Al considerar todos los bordes en forma conjunta, se diluye este efecto y tal diferencia entre estratos no es detectada. No se detectaron diferencias entre los operadores.

Com o objetivo de verificar a flutuação populacional de gafanhotos na Floresta Nacional de Chapecó (FLONA), em Santa Catarina, foram realizadas coletas semanais durante o período de dezembro de 2003 a dezembro de 2004 com armadilhas do tipo pit-fall, rede de varredura, guarda-chuva entomológico e malaise. Os picos populacionais para a maioria das espécies ocorreram durante os meses de dezembro, janeiro e fevereiro. A análise de regressão (5%) apontou relação significativa entre os fatores climáticos e os níveis populacionais de Allotruxalis gracilis (Giglio-Tos, 1897), Parorphula graminea Bruner, 1900, Rhammatocerus brunneri (Giglio – Tos, 1895) e Xyleus discoideus discoideus (Serville, 1831).

In order to verify the grasshopper population dynamics in the National Forest of Chapecó, SC., weekly collections were made between December 2003 and December 2004, using pit-fall traps, sweep nets, entomological umbrellas and malaises traps. The population peaks for most of the species was reached in December, January and February. The regression analysis (5%) showed significant relation between the climatic factors and the population levels of Allotruxalis gracilis (Giglio-Tos, 1897), Parorphula graminea Bruner, 1900, Rhammatocerus brunneri (Giglio – Tos, 1895) and Xyleus discoideus discoideus (Serville, 1831).

Através de procedimento de coletas e observações periódicas, ao longo de cinco anos, na Estação Ecológica do Tapacurá, São Lourenço da Mata, PE, procedeu-se a um inventário sistemático-ecológico da distribuição dos gafanhotos da estação, adotando-se critérios classificatórios de Acridoidea com novos assinalamentos de famílias, subfamílias, tribos, gêneros e espécies, relacionados aos diversos tipos de vegetação e ambientes da estação.

Over the last five years, collection and periodic observation in the Tapacurá Ecological Station, São Lourenço da Mata, Pernambuco, Brazil, have been carried out to produce a systematic ecological inventory of grasshopper distribution within the station based on the classifying criteria for Acridoidea, providing new data on families, subfamilies, tribes, genera and species related to the various types of vegetation and environments the station affords.