Culicidae, province of Misiones, northeastern Argentina

We present a preliminary list of the Culicidae species collected in seven localities at the province of Misiones, Argentina, since the mosquito fauna of this region is poorly known. Mosquito sampling was carried out during spring-summer, between August 2006 and January 2007, the months of highest abundance of these insects. Collection of specimens was made with a CDC-like trap (Center for Disease Control and Prevention) in peri-urban zones. Sixty-five species were identified. The geographic distribution of Anopheles darlingi, Uranotaenia davisi and Howardina fulvithorax is extended.Facultad de Ciencias Naturales y Muse

Phylogeny and chromosomal diversification in the <i>Dichroplus elongatus</i> species group (Orthoptera, Melanoplinae)

In an attempt to track the chromosomal differentiation in the Dichroplus elongatus species group, we analyzed the karyotypes of four species with classical cytogenetic and mapping several multigene families through fluorescent in situ hybridization (FISH). We improved the taxon sampling of the D. elongatus species group adding new molecular data to infer the phylogeny of the genus and reconstruct the karyotype evolution. Our molecular analyses recovered a fully resolved tree with no evidence for the monophyly of Dichroplus. However, we recovered several stable clades within the genus, including the D. elongatus species group, under the different strategies of tree analyses (Maximum Parsimony and Maximum Likelihood). The chromosomal data revealed minor variation in the D. elongatus species group's karyotypes caused by chromosome rearrangements compared to the phylogenetically related D. maculipennis species group. The karyotypes of D. intermedius and D. exilis described herein showed the standard characteristics found in most Dichroplini, 2n = 23/24, X0♂ XX♀, Fundamental number (FN) = 23/24. However, we noticed two established pericentric inversions in D. intermedius karyotype, raising the FN to 27♂/28♀. A strong variation in the heterochromatic blocks distribution was evidenced at interespecific level. The multigene families' mapping revealed significant variation, mainly in rDNA clusters. These variations are probably caused by micro chromosomal changes, such as movement of transposable elements (TEs) and ectopic recombination. These observations suggest a high genomic dynamism for these repetitive DNA sequences in related species. The reconstruction of the chromosome character "variation in the FN" posits the FN = 23/24 as the ancestral state, and it is hypothesized that variations due to pericentric inversions has arisen independently three times in the evolutionary history of Dichroplus. One of these independent events occurred in the D. elongatus species group, where D. intermedius is the unique case with the highest FN described in the tribe Dichroplini.Centro de Estudios Parasitológicos y de VectoresFacultad de Ciencias Naturales y Muse

Phylogeny and chromosomal diversification in the <i>Dichroplus elongatus</i> species group (Orthoptera, Melanoplinae)

In an attempt to track the chromosomal differentiation in the Dichroplus elongatus species group, we analyzed the karyotypes of four species with classical cytogenetic and mapping several multigene families through fluorescent in situ hybridization (FISH). We improved the taxon sampling of the D. elongatus species group adding new molecular data to infer the phylogeny of the genus and reconstruct the karyotype evolution. Our molecular analyses recovered a fully resolved tree with no evidence for the monophyly of Dichroplus. However, we recovered several stable clades within the genus, including the D. elongatus species group, under the different strategies of tree analyses (Maximum Parsimony and Maximum Likelihood). The chromosomal data revealed minor variation in the D. elongatus species group's karyotypes caused by chromosome rearrangements compared to the phylogenetically related D. maculipennis species group. The karyotypes of D. intermedius and D. exilis described herein showed the standard characteristics found in most Dichroplini, 2n = 23/24, X0♂ XX♀, Fundamental number (FN) = 23/24. However, we noticed two established pericentric inversions in D. intermedius karyotype, raising the FN to 27♂/28♀. A strong variation in the heterochromatic blocks distribution was evidenced at interespecific level. The multigene families' mapping revealed significant variation, mainly in rDNA clusters. These variations are probably caused by micro chromosomal changes, such as movement of transposable elements (TEs) and ectopic recombination. These observations suggest a high genomic dynamism for these repetitive DNA sequences in related species. The reconstruction of the chromosome character "variation in the FN" posits the FN = 23/24 as the ancestral state, and it is hypothesized that variations due to pericentric inversions has arisen independently three times in the evolutionary history of Dichroplus. One of these independent events occurred in the D. elongatus species group, where D. intermedius is the unique case with the highest FN described in the tribe Dichroplini.Centro de Estudios Parasitológicos y de VectoresFacultad de Ciencias Naturales y Muse

Rensch’s Rule in Dichroplus pratensis: A Reply to Wolak

Submitted by Sandra Infurna ([email protected]) on 2019-03-14T17:01:28Z No. of bitstreams: 1 claudioJ_BIday_Dardomarti_IOC_2008.pdf: 193964 bytes, checksum: e91cdc08380f381cb69189d9aa896bd1 (MD5)Approved for entry into archive by Sandra Infurna ([email protected]) on 2019-03-14T17:07:33Z (GMT) No. of bitstreams: 1 claudioJ_BIday_Dardomarti_IOC_2008.pdf: 193964 bytes, checksum: e91cdc08380f381cb69189d9aa896bd1 (MD5)Made available in DSpace on 2019-03-14T17:07:33Z (GMT). No. of bitstreams: 1 claudioJ_BIday_Dardomarti_IOC_2008.pdf: 193964 bytes, checksum: e91cdc08380f381cb69189d9aa896bd1 (MD5) Previous issue date: 2008Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios. Rio de Janeiro, RJ. Brasil.Universidad Nacional de Misiones. Laboratorio de Genética Evolutiva. Posadas, Argentina

Un Test de la Regla de Allen en Ectotermos: El Caso de dos Saltamontes Melanoplinos (Orthoptera: Acrididae) Sudamericanos con Distribuciones Geográfi cas parcialmente Solapadas

Submitted by Sandra Infurna ([email protected]) on 2020-02-11T14:38:35Z No. of bitstreams: 1 ClaudioBidau_DardoMarti_IOC_2008.pdf: 681041 bytes, checksum: b4e71b3858d2db4450622c45a30b4607 (MD5)Approved for entry into archive by Sandra Infurna ([email protected]) on 2020-02-11T15:24:48Z (GMT) No. of bitstreams: 1 ClaudioBidau_DardoMarti_IOC_2008.pdf: 681041 bytes, checksum: b4e71b3858d2db4450622c45a30b4607 (MD5)Made available in DSpace on 2020-02-11T15:24:48Z (GMT). No. of bitstreams: 1 ClaudioBidau_DardoMarti_IOC_2008.pdf: 681041 bytes, checksum: b4e71b3858d2db4450622c45a30b4607 (MD5) Previous issue date: 2008Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Rio de Janeiro, RJ, Brasil / Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina.Consejo Nacional de Investigaciones Científicas y Técnicas. Buenos Aires, Argentina / Universidad Nacional de Misiones. Facultad de Ciencias Exactas, Químicas y Naturales. Posadas, Argentina.Estudiamos la variación geográfi ca de tres caracteres morfométricos en relación al tamaño corporal, en dos saltamontes sudamericanos (Acrididae), Dichroplus vittatus Bruner y D. pratensis Bruner, para verifi car la regla de Allen en ectotermos. Ambas especies siguen la regla de Bergmann inversa por variación latitudinal y/o altitudinal en el tiempo disponible para crecimiento y reproducción; entonces la variación de proporciones de partes salientes del cuerpo, obedecería a crecimiento alométrico diferencial en diferentes áreas geográfi cas. Alternativamente, podría refl ejar variación alleniana relacionada a termorregulación. Las proporciones corporales se estudiaron por análisis de correlación/regresión con variables geográfi cas y climáticas. En D. pratensis, las proporciones corporales aumentaron con la latitud, y decrecieron con la altitud. Esto probablemente obedezca a efectos del balance hídrico y la estacionalidad sobre el tamaño corporal fi nal, y al crecimiento alométrico de los tres caracteres independientemente de la termorregulación. En D. vittatus, se observó una tendencia generalmente no signifi cativa al decrecimiento de las proporciones de los tres caracteres con el incremento de latitud. Sin embargo, también es probable que el gradiente ambiental responda a factores de estacionalidad que afectan la duración de la estación de crecimiento y, consecuentemente, el tamaño corporal y sus relaciones alométricas. Concluimos qué las relaciones alométricas en la distribución geográfi ca de proporciones corporales de D. pratensis y D. vittatus no siguen la regla de Allen en el sentido de la termorregulación, y son el resultado de variables que determinan la duración de la estación de crecimiento y el crecimiento alométrico de diferentes partes del cuerpo.We studied the geographic variation of three morphometric characters in relation to body size in two South American grasshoppers (Acrididae), Dichroplus vittatus Bruner and D. pratensis Bruner to test Allen's rule in these ectotherms. Since both species follow the converse to Bergmann's rule owing to latitudinal and/or altitudinal variation in time available for growth and reproduction, geographic variation in body size proportions of protruding parts may obey to differential allometric growth in different geographic areas. Alternatively, it could reflect true Allenian variation related to thermoregulation. Body proportions were studied by correlation/regression analyses with geographic and climatic variables. In D. pratensis, body proportions increased with latitude and decreased with altitude. These results probably obey to the effects of water balance and seasonality on final body size, and on the allometric growth of the three studied characters not being related to thermoregulation. In D. vittatus, a generally non-significant trend towards the decrease of the mean proportions of all three characters with increasing latitude was observed. Nevertheless, also in this species, it is probable that the environmental gradient responds to seasonality factors (although not to water balance) that affect the length of growing season and, in consequence, body size and its allometric relationships. We conclude that the regularities in the geographic distribution of body proportions of D. pratensis and D. vittatus do not follow Allen's rule in the sense of thermoregulation, and result from variables that determine growing season length and the allometric growth of different body parts

A test of Allen’s rule in subterranean mammals: the genus Ctenomys (Caviomorpha, Ctenomyidae)

Submitted by Sandra Infurna ([email protected]) on 2016-10-06T16:57:46Z No. of bitstreams: 1 claudio2_bidau_etal_IOC_2011.pdf: 470420 bytes, checksum: 65b42f04459e5954e36a466e553b0ba6 (MD5)Approved for entry into archive by Sandra Infurna ([email protected]) on 2016-10-06T17:10:40Z (GMT) No. of bitstreams: 1 claudio2_bidau_etal_IOC_2011.pdf: 470420 bytes, checksum: 65b42f04459e5954e36a466e553b0ba6 (MD5)Made available in DSpace on 2016-10-06T17:10:40Z (GMT). No. of bitstreams: 1 claudio2_bidau_etal_IOC_2011.pdf: 470420 bytes, checksum: 65b42f04459e5954e36a466e553b0ba6 (MD5) Previous issue date: 2011Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios. Rio de Janeiro, RJ, Brasil.Universidad Nacional de Misiones. Facultad de Ciencias Exactas, Químicas y Naturales. Laboratorio de Genética Evolutiva. Posadas, Argentina / Consejo Nacional de Investigaciones Científicas y Técnicas . Buenos Aires , Argentina.Instituto de Biología Marina y Pesquera “Almirante Storni ". Rio Negro, Argentina / Consejo Nacional de Investigaciones Científicas y Técnicas . Buenos Aires , Argentina.We tested the applicability of Allen's rule in 47 species and 32 unnamed forms (populations that are probably good species or undefined taxa within a superspecies or species group) of the South American subterranean Hystricomorph rodents of the genus Ctenomys (tuco-tucos) (Rodentia: Ctenomyidae) by analyzing tail length in relation with head and body length, and body mass. Tail length allometry was analyzed by Reduced Major Axis regression while the possible correlation of relative tail length with temperature, precipitation and evapotranspiration variables was explored through Simultaneous Autoregression to account for spatial autocorrelations. Our results indicate that tuco-tucos do not follow Allen's rule but its converse, tail proportion relative to body mass increasing with latitude while body size decreases in the same direction (the trend is similar for tail length relative to head and body length but not statistically significant). Regarding climatic variables, the main predictors of relative tail length were temperature and evapotranspiration variables with trends confirming the positive (non-Allenian) correlation of relative tail length with latitude. We conclude that tuco-tucos, being almost fully subterranean, thermoregulate behaviorally by maintaining constant temperatures within their burrows independent of geographic location. The former confirms previous results that indicated that Ctenomys follows the converse to Bergmann's rule. Relative tail length variation would be a result of simple allometric growth

Effects of Abiotic Factors on the Geographic Distribution of Body Size Variation and Chromosomal Polymorphisms in Two Neotropical Grasshopper Species (Dichroplus: Melanoplinae: Acrididae)

We review the effects of abiotic factors on body size in two grasshopper species with large geographical distributions: Dichroplus pratensis and D. vittatus, inhabiting Argentina in diverse natural habitats. Geographical spans for both species provide an opportunity to study the effects of changes in abiotic factors on body size. The analyses of body size distribution in both species revealed a converse Bergmannian pattern: body size is positively correlated with latitude, altitude, and seasonality that influences time available for development and growth. Allen’s rule is also inverted. Morphological variability increases towards the ends of the Bergmannian clines and, in D. pratensis, is related with a central-marginal distribution of chromosomal variants that influence recombination. The converse Bergmannian patterns influence sexual size dimorphism in both species but in different fashions. Body size variation at a microspatial scale in D. pratensis is extremely sensitive to microclimatic clines. We finally compare our results with those for other Orthopteran species