70 Works

Data from: Mutualism effectiveness and vertical transmission of symbiotic fungal endophytes in response to host genetic background

Pedro E. Gundel, María A. Martínez-Ghersa, Marina Omacini, Romina Cuyeu, Elba Pagano, Raúl Ríos & Claudio M. Ghersa
Certain species of the Pooideae subfamily develop stress tolerance and herbivory resistance through symbiosis with vertically-transmitted, asexual fungi. This symbiosis is specific, and genetic factors modulate compatibility between partners. Although gene flow is clearly a fitness trait in allogamous grasses, since it injects hybrid vigor and raw material for evolution, it could reduce compatibility and thus, mutualism effectiveness. To explore the importance of host genetic background in modulating the performance of symbiosis, Lolium multiflorum plants,...

Data from: Systematics of spiny-backed treefrogs (Hylidae: Osteocephalus): an Amazonian puzzle

Karl-Heinz Jungfer, Julián Faivovich, José M. Padial, Santiago Castroviejo-Fisher, Mariana M. Lyra, Bianca Von Muller Berneck, Patricia P. Iglesias, Philippe J. R. Kok, Ross T. Macculloch, Miguel Trefaut Rodrigues, Vanessa K. Verdade, Claudia P. Torres Gastello, Juan Carlos Chaparro, Paula H. Valdujo, Steffen Reichle, Jiří Moravec, Václav Gvoždík, Giussepe Gagliardi-Urrutia, Raffael Ernst, Ignacio De La Riva, Donald Bruce Means, Albertina P. Lima, J. Celsa Señaris, Ward C. Wheeler & Célio F. B. Haddad
Spiny-backed tree frogs of the genus Osteocephalus are conspicuous components of the tropical wet forests of the Amazon and the Guiana Shield. Here, we revise the phylogenetic relationships of Osteocephalus and its sister group Tepuihyla, using up to 6134 bp of DNA sequences of nine mitochondrial and one nuclear gene for 338 specimens from eight countries and 218 localities, representing 89% of the 28 currently recognized nominal species. Our phylogenetic analyses reveal (i) the paraphyly...

Data from: A shady business: pine afforestation alters the primary controls on litter decomposition along a precipitation gradient in Patagonia, Argentina

Patricia I. Araujo & Amy T. Austin
Our understanding of the principal controls on litter decomposition is critical for our capacity to predict how global changes will impact terrestrial ecosystems. Although climate, litter quality and soil organisms clearly modulate carbon (C) and nutrient turnover, land-use change affecting plant species composition and structure can alter the relative importance of such controls. We took advantage of prior land-use changes of intentional planting of exotic forest species along a broad precipitation gradient [250–2200 mm mean...

Data from: Drosophila wing modularity revisited through a quantitative genetic approach

Francesc Muñoz-Muñoz, Valeria Paula Carreira, Neus Martínez-Abadías, Victoria Estefanía Ortiz, Rolando González-José, Ignacio M. Soto & Victoria Ortiz
To predict the response of complex morphological structures to selection it is necessary to know how the covariation among its different parts is organized. Two key features of covariation are modularity and integration. The Drosophila wing is currently considered a fully integrated structure. Here, we study the patterns of integration of the Drosophila wing and test the hypothesis of the wing being divided into two modules along the proximo-distal axis, as suggested by developmental, biomechanical,...

Data from: Morphological evolution of the bivalve Ptychomya through the Lower Cretaceous of Argentina

Pablo S. Milla Carmona, Dario G. Lazo & Ignacio M. Soto
The complex morphological evolution of the bivalve Ptychomya throughout the well studied Agrio Formation in the Neuquén Basin (west-central Argentina, lower/upper Valanginian – lowest Barremian) constitutes an ideal opportunity to study evolutionary patterns and processes occurring at geological timescales. Ptychomya is represented in this unit by four species, the morphological variation of which need to be temporally assessed in order to obtain a thorough picture of the evolution of the group. Here we use geometric...

El campesinado en el cine documental cubano de la primera etapa de la Revolución (1959-1961)

Hernán Dopazo
Artigo sobre as representações do campesinato que o cinema documental da primeira etapa da Revolução construiu, através da análise de uma série de filmes, organizada em eixos temáticos: Esta tierra nuestra (1959), de Tomás Gutiérrez Alea, ¿Por qué nació el Ejército Rebelde? (1960), de José Massip e Tierra olvidada (1960), de Oscar Torres. A análise permitiu identificar a representação de dois campos opostos que delimitam um “eles-passado opressor” de um “nós-atualidade de redenção”.

The more the merrier: evaluating managed pollinators in highbush blueberry

Walter Farina, Maria Estravis Barcala, Florencia Palottini, Ivana Macri, Denise Nery & Walter Farina
As the global stock of Apis mellifera colonies is growing slower than agricultural demands for pollination services, there is great interest in managing alternative species. Highbush blueberry floral morphology limits the access of bees to nectar and pollen, requiring growers to rent a considerable number of beehives. Recently, the South American bumblebee Bombus pauloensis is increasingly managed alongside honeybees. Herein, we evaluated their foraging patterns, in relation to the potential pollen transfer between two blueberry...

Mowing does not redress the negative effect of nutrient addition on alpha and beta diversity in a temperate grassland

Cecilia Denisse Molina
Species loss due to an increasing number of added nutrients has been explained by both light competition through biomass increase and by niche dimension reduction as a result of species specific limiting soil resources trade-offs. Disturbances, by reducing community biomass, species dominance and increasing light availability, may counteract above ground nutrient effects. However, it is unknown if diversity loss at local or spatial scales generated by increasing number of added nutrients can be redressed with...

Worlds apart: location above- or belowground determines plant litter decomposition in a semiarid Patagonian steppe

Paula Berenstecher, Patricia I. Araujo & Amy T. Austin
1. While considerable attention has been devoted to how precipitation modulates net primary productivity in arid and semiarid ecosystems, the emergence of multi-faceted controls on carbon (C) turnover suggests that there is much to be understood with respect to the mechanistic controls on plant litter decomposition. 2. In the Patagonian steppe, we conducted a long-term factorial experiment, evaluating the importance of position, litter quality, tissue origin and soil resources on rates of C turnover under...

Urbanization buffers seasonal change in composition of bird communities: a multi-continental meta-analysis

Lucas Leveau, Jukka Jokimäki & Marja-Liisa Kaisanlahti-Jokimäki
Aim: Urbanization buffers the seasonality of climate conditions and food availability and, therefore, may cause a seasonal homogenization of animal communities. However, the global effect of urbanization on the seasonal dynamics of animal communities remains unexplored. Our aim was to study the multi-continental relationship between urbanization and the seasonal change in bird composition and explore the influence of climatic factors on the urban-induced reduction of seasonality of bird composition. Location: Multi-continental Methods: We performed a...

Idioma universal, filiación lingüística e historia americana La filología de Miguel Ángel Mossi

Emiliano Battista
En el presente trabajo analizamos la concepción del lenguaje de Miguel Ángel Mossi, misionero apostólico italiano de intensa actividad en el escenario intelectual argentino del siglo XIX. Para ello, dividimos la exposición de acuerdo con tres aspectos que consideramos centrales para comprender el alcance de su labor filológica: la postulación de un idioma universal subyacente a la diversidad lingüística (decimonónica), el rol desempeñado por el hebreo en la búsqueda del origen del lenguaje y, por...

Local male breeding density affects extra-pair paternity in a south temperate population of grass wrens Cistothorus platensis

Ramiro Arrieta, Leonardo Campagna, Bettina Mahler, Irby Lovette & Paulo Llambias
Demographic factors can affect the frequency of extra-pair paternity (EPP) in birds, as the distribution and availability of potential mates in both space and time influence the rate of encounters between females and males. Over three breeding seasons, we intensively studied the breeding system of a south temperate population of grass wrens Cistothorus platensis by genotyping 73 broods (319 nestlings) and estimating EPP rates for those broods. Using five different radii (80, 160, 240, 320,...

Crímenes de Estado y contra el Estado. Variaciones en el western argentino y mexicano

Román Setton
pp. 53-69. The paper analyzes the transformations that western film undergoes-a genre that represents the foundational and constituent crimes of the nation state-, in the appropriations made by Argentine and Mexican cinema. I focus in particular on the changes that can be perceived in the figure of the hero, in the representation of indigenous peoples and in the representation of women. Within Argentine cinema, I discuss in particular the film Pampa bárbara, while in Mexican...

Data from: Community disassembly and invasion of remnant native grasslands under fluctuating resource supply

Pedro Maximiliano Tognetti & Enrique Jose Chaneton
1. Native vegetation fragments embedded in anthropogenic landscapes are increasingly threatened by land-use intensification. Managing disturbance regimes and nutrient inputs may help maintain species diversity in such remnants. Yet it is unclear the extent to which changes in resource availability due to reduced capture by resident plants and/or increased supply rates may trigger native community disassembly and exotic invasions. 2. We examined how mowing disturbance and N fertilizer addition affected plant community recovery after a...

Data from: Episodic bamboo die-off, neighbourhood interactions, and tree seedling performance in a Patagonian mixed forest

Fernando D. Caccia, Thomas Kitzberger & Enrique J. Chaneton
1. Episodic mass flowering and subsequent die-off of bamboo understories may generate rare opportunities for tree regeneration by altering consumer-seedling interactions as much as by increasing light availability to seedlings. We hypothesized that bamboo dieback interacts with canopy neighbourhood composition in creating recruitment microsites for tree seedling species with varied shade tolerance and susceptibility to herbivory. 2. We conducted a 2-year experiment in a Patagonian mixed forest altered by extensive, but patchy dieback of the...

Data from: Phylogenetic relationships of toads of the Rhinella granulosa group (Anura: Bufonidae): a molecular perspective with comments on hybridization and introgression

Martín O. Pereyra, Diego Baldo, Boris L. Blotto, Patricia P. Iglesias, Maria T. C. Thomé, Célio F. B. Haddad, César Barrio-Amorós, Roberto Ibáñez & Julián Faivovich
The Rhinella granulosa group consists of 13 species of toads distributed throughout open areas of South America and Panama. In this paper we perform a phylogenetic analysis considering all but one species of the group, employing five nuclear and four mitochondrial genes, for up to 7910 bp per specimen. Separate phylogenetic analyses under direct optimization (DO) of nuclear and mitochondrial sequences recovered the R. granulosa group as monophyletic and revealed topological incongruence that can be...

Data from: Giving taxonomic significance to morphological variability in the bivalve Ptychomya Agassiz

Pablo S. Milla Carmona, Dario G. Lazo & Ignacio M. Soto
The taxonomic significance of the morphological variability present in the genus Ptychomya Agassiz has remained obscure due to inadequacy of the traditional qualitative approach to account for complex patterns of variation. In this work, we focus on solving the distinction between intra- and interspecific variability in Ptychomya from Hauterivian marine beds of the Neuquén Basin (west-central Argentina), a longstanding and unresolved palaeontological issue, using the quantitative framework provided by geometric morphometrics and multivariate statistics. The...

Data from: Mapping extinction debt highlights conservation opportunities for birds and mammals in the South American Chaco

Asunción Semper-Pascual, Leandro Macchi, Francesco Maria Sabatini, Julieta Decarre, Matthias Baumann, Pedro G. Blendinger, Bibiana Gómez-Valencia, Matias E. Mastrangelo & Tobias Kuemmerle
1. Habitat loss is the primary cause of local extinctions. Yet, there is considerable uncertainty regarding how fast species respond to habitat loss, and how time-delayed responses vary in space. 2. We focused on the Argentine Dry Chaco (ca. 32 million ha), a global deforestation hotspot, and tested for time-delayed response of bird and mammal communities to landscape transformation. We quantified the magnitude of extinction debt by modelling contemporary species richness as a function of...

Data from: Crop pests and predators exhibit inconsistent responses to surrounding landscape composition

Daniel S. Karp, Rebecca Chaplin-Kramer, Timothy D. Meehan, Emily A. Martin, Fabrice DeClerck, Heather Grab, Claudio Gratton, Lauren Hunt, Ashley E. Larsen, Alejandra Martínez-Salinas, Megan E. O’Rourke, Adrien Rusch, Katja Poveda, Mattias Jonsson, Jay A. Rosenheim, Nancy A. Schellhorn, Teja Tscharntke, Stephen D. Wratten, Wei Zhang, Aaron L. Iverson, Lynn S. Adler, Matthias Albrecht, Audrey Alignier, Gina M. Angelella, Muhammad Zubair Anjum … & Yi Zou
The idea that noncrop habitat enhances pest control and represents a win–win opportunity to conserve biodiversity and bolster yields has emerged as an agroecological paradigm. However, while noncrop habitat in landscapes surrounding farms sometimes benefits pest predators, natural enemy responses remain heterogeneous across studies and effects on pests are inconclusive. The observed heterogeneity in species responses to noncrop habitat may be biological in origin or could result from variation in how habitat and biocontrol are...

Data from: Host provisioning behavior favors mimetic begging calls in a brood-parasitic cowbird

Cynthia A. Ursino, Ros Gloag, Juan C. Reboreda & Maria C. De Mársico
The vocalizations of some young brood-parasitic birds closely resemble those of their host’s young. Such similarities might arise because hosts bestow the greatest parental care in response to their own species’ call type. We used a playback experiment to assess the effectiveness of the nestling call structures of two brood parasites, the specialist screaming cowbird (Molothrus rufoaxillaris) and the generalist shiny cowbird (M. bonariensis), in stimulating parental provisioning in a shared host, the baywing (Agelaioides...

Data from: Plant functional composition affects soil processes in novel successional grasslands

Laura Yahdjian, Pedro M. Tognetti & Enrique J. Chaneton
1. Secondary succession may lead to novel, exotic-dominated community states differing in structure and function from the original native counterparts. We hypothesized that grassland soil processes associated with C and N cycling decelerate with community turnover from short-lived forbs and grasses to long-lived native grasses, whereas invasion by exotic perennial grasses maintains fast cycling rates. 2. We measured litter C and N turnover during decomposition, soil respiration, and soil N dynamics in synthetic plant communities...

Data from: The influence of developmental environment on courtship song in cactophilic Drosophila

Patricia P. Iglesias, Eduardo M. Soto, Ignacio M. Soto, Betina Colines & Esteban Hasson
Closely related species often differ in the signals involved in sexual communication and mate recognition. Determining the factors influencing signal quality (i.e. signal's content and conspicuousness) provides an important insight into the potential pathways by which these interspecific differences evolve. Host specificity could bias the direction of the evolution of sexual communication and the mate recognition system, favoring sensory channels that work best in the different host conditions. In this study, we focus on the...

Evolution of male genitalia in the Drosophila repleta species group (Diptera: Drosophilidae)

Manuel Stefanini, Marco Silva Gottschalk, Natalia Soledad Calvo & Ignacio Maria Soto
The Drosophila repleta group comprises more than one hundred species that inhabit several environments in the Neotropics and use different hosts as rearing and feeding resources. Rather homogeneous in their external morphology, they are generally distinguished by the male genitalia, their fastest evolving morphological trait, constituting an excellent model to study patterns of genital evolution in the context of a continental adaptive radiation. Although much is known about the evolution of animal genitalia at population...

Data from: Different frequency control mechanisms and the exploitation of frequency space in passerines

Franz Goller, Jay Love & Gabriel Mindlin
1. Birdsong is used in reproductive context and, consequently, has been shaped by strong natural and sexual selection. The acoustic performance includes a multitude of acoustic and temporal characteristics that are thought to honestly reveal the quality of the singing individual. 2. One major song feature is frequency and its modulation. Sound frequency can be actively controlled, but the control mechanisms differ between different groups. Two described mechanisms are pressure-driven frequency changes in suboscines and...

Data from: Ontogeny in the steinmanellines (Bivalvia: Trigoniida): an intra- and interspecific appraisal using the Early Cretaceous faunas from the Neuquén Basin as a case study

Pablo S. Milla Carmona, Dario G. Lazo & Ignacio M. Soto
Despite the paleontological relevance and paleobiological interest of trigoniid bivalves, our knowledge of their ontogeny –an aspect of crucial evolutionary importance– remains limited. Here, we assess the intra- and interspecific ontogenetic variations exhibited by the genus Steinmanella Crickmay (Myophorellidae: Steinmanellinae) during the early Valanginian – late Hauterivian of Argentina, and explore some of their implications. The (ontogenetic) allometric trajectories of seven species recognized for this interval were estimated from longitudinal data using 3D geometric morphometrics,...

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  • University of Buenos Aires
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  • Bernardino Rivadavia Natural Sciences Museum
  • University of California, Berkeley
  • United States Department of Agriculture
  • Sao Paulo State University
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