15 Works

Data from: Rapid speciation via the evolution of pre-mating isolation

Sheela Turbek, Melanie Browne, Adrián S. Di Giacomo, Cecilia Kopuchian, Wesley Hochachka, M. Cecilia Estalles, Darío Lijtmaer, Pablo Tubaro, Luís Fábio Silveira, Irby J. Lovette, Rebecca Safran, Scott Taylor & Leonardo Campagna
Behavioral isolation can catalyze speciation and permit the slow accumulation of additional reproductive barriers between co-occurring organisms. We illustrate how this process occurs by examining the genomic and behavioral bases of pre-mating isolation between two bird species (Sporophila hypoxantha and the recently discovered S. iberaensis) that belong to the capuchino seedeaters, a recent, rapid radiation characterized by variation in male plumage coloration and song. Though these two species co-occur without ecological barriers to reproduction, we...

Data used to estimate the influence of habitat protection, habitat heterogeneity, and periodic flooding on species richness and abundance of waterbirds of the lower Paraná River, Argentina

Virginia Quiroga, Ana Laura Ronchi-Virgolini, Rodrigo Lorenzon & Martjan Lammertink
Interest has grown in how birds respond to environmental characteristics of river systems, motivated by the high biodiversity and biomass of waterbirds in these systems and the importance of waterbirds in hunting for sport or sustenance. We studied the influence of natural (water level fluctuations and environmental heterogeneity) and human-related (cattle grazing and hunting) factors on waterbirds in the Pre-Delta region of the Paraná River system during three years. Our objectives were to evaluate which...

Hearing from the ocean and into the river: The evolution of the inner ear of Platanistoidea (Cetacea, Odontoceti)

Mariana Viglino, Maximiliano Gaetán, Mónica R. Buono, R. Ewan Fordyce & Travis Park
The inner ear of the two higher clades of modern cetaceans (Neoceti) is highly adapted for hearing infrasonic (mysticetes) or ultrasonic (odontocetes) frequencies. Within odontocetes, Platanistoidea comprises a single extant riverine representative, Platanista gangetica, and a diversity of mainly extinct marine species from the late Oligocene onward. Recent studies, drawing on features including the disparate tympanoperiotic, have not yet provided a consensus phylogenetic hypothesis for platanistoids. Further, cochlear morphology and evolutionary patterns have never been...

Host suitability and fitness-related parameters in Coptera haywardi ([Hymenoptera]: [Diapriidae]) reared on irradiated Ceratitis capitata ([Diptera]: [Tehritidae]) pupae stemming from the genetic sexing Vienna-8 strain with a temperature-sensitive lethal mutation

Segundo R. Núñez-Campero, Suarez Lorena, Buonocore Biancheri María Josefina, Cancino Jorge, Murúa Fernando, Molina Diego, Laría Osvaldo, Aluja Martín & Ovruski Sergio M.
Coptera haywardi (Ogloblin) is a pupal endoparasitoid of tephritid flies with great potential as a biological control agent worldwide as it does not attack other Diptera. To reach its full potential, its mass rearing needs to be enhanced lowering costs. Here, we focused on the use of irradiated pupae of Ceratitis capitata (Wiedemann) stemming from the temperature-sensitive lethal (tsl) Vienna-8 genetic sexing strain (= CcVienna-8), which is mass-produced in the San Juan Medfly and Parasitoid...

Acesso à saúde e vulnerabilidades de migrantes internacionais no contexto de disseminação da COVID-19: uma pesquisa interinstitucional em rede colaborativa.

DENISE MARTIN
O avanço da pandemia de COVID-19 levou a Organização Mundial da Saúde (OMS) a decretar emergência internacional em janeiro de 2020. Em meados de março do mesmo ano, o Brasil, a exemplo de vários países do mundo, adotou o isolamento social e restrição à mobilidade como medida de prevenção e combate do contágio e disseminação do vírus no país, medida que vem sendo adotada contingencialmente até o momento. Tal situação gerou várias disputas entre grupos...

Low reproductive success of the endangered Iberá Seedeater in its only known breeding site, the Iberá Wetlands, Argentina

Melanie Browne, Sheela P. Turbek, Constanza Pasian & Adrián S. Di Giacomo
Subtropical grasslands are highly susceptible to habitat conversion and number among South America’s most threatened ecosystems. The grasslands of northeastern Argentina have been identified as a priority conservation area for threatened capuchino seedeaters because they constitute the main breeding area of these migratory birds. The Iberá Seedeater (Sporophila iberaensis) is a newly described species in the Iberá Wetlands in Argentina whose biology is still poorly understood. The endangered species inhabits grasslands, but has only been...

Proteolytic cleavage of Arabidopsis thaliana phosphoenolpyruvate carboxykinase-1 modifies its allosteric regulation

Bruno E Rojas, Matias D Hartman, Carlos M Figueroa & Alberto A Iglesias
Phosphoenolpyruvate carboxykinase (PEPCK) plays a crucial role in gluconeogenesis. In this work, we analyze the proteolysis of Arabidopsis thaliana PEPCK1 (AthPEPCK1) in germinating seedlings. We found that the amount of AthPEPCK1 protein peaks at 24-48 hours post-imbibition. Concomitantly, we observed shorter versions of AthPEPCK1, putatively generated by metacaspase-9 (AthMC9). To study the impact of AthMC9 cleavage on the kinetic and regulatory properties of AthPEPCK1, we produced truncated mutants based on the reported AthMC9 cleavage sites....

Negative impacts of dominance on bee communities: Does the influence of invasive honey bees differ from native bees?

Lucas Alejandro Garibaldi, Lucas Garibaldi, Néstor Pérez-Méndez, Guaraci Cordeiro, Alice Hughes, Michael Orr, Isabel Alves Dos Santos, Breno Freitas, Favízia Freitas De Oliveira, Gretchen Lebuhn, Ignasi Bartomeus, Marcelo Aizen, Patricia Andrade, Betina Blochtein, Danilo Boscolo, Patricia Drumond, Maria Gaglianone, Barbara Gemmill-Herren, Rosana Halinski, Cristiane Krug, Marcia Maues, Lucia Piedade Kiill, Mardiore Pinheiro, Carmen Pires & Blandina Felipe Viana
Invasive species can reach high abundances and dominate native environments. One of the most impressive examples of ecological invasions is the spread of the African sub-species of the honey bee throughout the Americas, starting from its introduction in a single locality in Brazil. The invasive honey bee is expected to more negatively impact bee community abundance and diversity than native dominant species, but this has not been tested previously. We developed a comprehensive and systematic...

Botanical affinity of the taxa encountered in the Maywood Formation

Michal Zaton, Hu Mingxi, Mercedes Di Pasquo & Paul Myrow
This dataset lists the species of palynomorphs occurring in the Middle Devonian (Givetian) deposits of the Maywood Formation of Cottonwood Canyon, Wyoming, USA. The palynological investigation was carried out in order to decipher the age and paleoenvironment of the microconchid tubeworms (Tentaculita) which were described from the deposits of the Maywood Formation. The retrieved data suggest a likely brackish water origin for the deposits studied, although temporary fully freshwater conditions cannot be ruled out. Indeed,...

Forest phenoclusters for Argentina based on vegetation phenology and climate

Eduarda Silveira, Volker Radeloff, Guillermo Martínez Pastur, Sebastián Martinuzzi, Natalia Politi, Leonidas Lizarraga, Luis Rivera, Gregorio Gavier-Pizarro, He Yin, Yamina Rosas, Noelia Calamari, María Navarro, Yanina Sica, Ashley Olah, Julieta Bono & Anna Pidgeon
Forest biodiversity conservation and species distribution modeling greatly benefit from broad-scale forest maps depicting tree species or forest types rather than just presence and absence of forest, or coarse classifications. Ideally, such maps would stem from satellite image classification based on abundant field data for both model training and accuracy assessments, but such field-data does not exist in many parts of the globe. However, different forest types and tree species differ in their vegetation phenology,...

Regression models generated by APRANK (computational prioritization of antigenic proteins and peptides from complete pathogen proteomes)

Alejandro Ricci & Fernán Agüero
Availability of highly parallelized immunoassays has renewed interest in the discovery of serology-based biomarkers for infectious diseases. Protein and peptide microarrays now provide a high-throughput platform for immunological screening of potential antigens and B-cell epitopes. However, there is still a need to prioritize relevant probes when designing these arrays. In this work we describe a computational method called APRANK (Antigenic Protein and Peptide Ranker) which integrates multiple molecular features to prioritize antigenic targets starting from...

Combined secondary compounds naturally found in nectars enhance honeybee cognition and survival

Walter Farina, Ignacio Marchi, Florencia Palottini, Ignacio Luis Marchi & Walter Marcelo Farina
The alkaloid caffeine and the amino acid arginine are present as secondary compounds in nectars of some flower species visited by pollinators. Each of these compounds affects honeybee appetitive behaviors by improving its foraging activity and learning. While caffeine potentiates responses of mushroom body neurons involved in honeybee learning processes, arginine acts as precursor of nitric oxide enhancing the protein synthesis involved in memory formation. Despite existing evidence on how these compounds affect honeybee cognitive...

Census data of growth, mortality and size stage transitions of nests of leaf-cutting ant species before and after fires

Alejandro Gustavo Farji-Brener
We hypothesized that fires will affect more the species that build external, easily flammable thatch mounds with superficial fungal gardens (Acromyrmex lobicornis) than colonies that build subterranean nests in the less-flammable bare-ground (Acromyrmex striatus). We use a stochastic matrix demographic model parameterized with 4 years of data in pre and post fire scenarios. This data set contain all the census data which from we build the matrix models.

Plausible causes of seed preferences and diet composition in seed-eating passerines

Luis Marone, Victor Cueto, Javier Lopez De Casenave, Agustín Zarco & Sergio Camín
We evaluated whether seed mass, handling time, handling efficiency and profitability account for (a) preferences in controlled experiments, and (b) field-diet composition of four bird species of the Monte desert, Argentina. The question of whether birds maximise their energy intake rates while feeding on seeds is assessed. We used feeding experiments with six native seed species of 0.07 – 0.75 mg (i.e. the seed-size range consumed in nature), which account for 0.59 – 0.84 of...

Opposing community assembly patterns for dominant and non-dominant plant species in herbaceous ecosystems globally

Carlos Alberto Arnillas, Elizabeth Borer, Eric Seabloom, Juan Alberti, Selene Baez, Jonathon Bakker, Elizabeth Boughton, Yvonne Buckley, Miguel Bugalho, Ian Donohue, John Dwyer, Jennifer Firn, Riley Gridzak, Nicole Hagenah, Yann Hautier, Aveliina Helm, Anke Jentsch, , Kimberly Komatsu, Lauri Laanisto, Ramesh Laungani, Rebecca McCulley, Joslin Moore, John Morgan, Pablo Peri … & Marc Cadotte
Biotic and abiotic factors interact with dominant plants —the locally most frequent or with the largest coverage— and non-dominant plants differently, partially because dominant plants modify the environment where non-dominant plants grow. For instance, if dominant plants compete strongly, they will deplete most resources, forcing non-dominant plants into a narrower niche space. Conversely, if dominant plants are constrained by the environment, they might not exhaust available resources but instead may ameliorate environmental stressors that usually...

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