Santiago Guillermo Ceballos

Santiago Guillermo Ceballos
Universidad Nacional de Tierra del Fuego | untdf · ICPA

Doctor in Biology

About

28
Publications
3,555
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270
Citations
Citations since 2017
12 Research Items
155 Citations
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Publications

Publications (28)
Article
Full-text available
Patagonia is an understudied area, especially when it comes to population genomic studies with relevance to fishery management. However, the dynamic and heterogeneous landscape in this area can harbor an important but cryptic genetic population structure. Once such information is revealed, it can be integrated into the management of infrequently in...
Preprint
Patagonia is an understudied area, especially when it comes to population genomic studies with relevance to fishery management. However, the dynamic and heterogeneous landscape in this area can harbor important but cryptic genetic population structure. Once such information is revealed, it can be integrated into the management of infrequently inves...
Preprint
Full-text available
Patagonia is an understudied area, especially when it comes to population genomic studies with relevance to fishery management. However, the dynamic and heterogeneous landscape in this area can harbor important but cryptic genetic population structure. Once such information is revealed, it can be integrated into the management of infrequently inves...
Article
The giant Antarctic toothfish Dissostichus mawsoni is one of the most economically valued fishery resources from the Southern Ocean. However, the distinctive biological characteristics and life history of this species, including large body size, long life span, late sexual maturity, and specialization to freezing polar waters, make it particularly...
Article
Full-text available
Background The impressive adaptive radiation of notothenioid fishes in Antarctic waters is generally thought to have been facilitated by an evolutionary key innovation, antifreeze glycoproteins, permitting the rapid evolution of more than 120 species subsequent to the Antarctic glaciation. By way of contrast, the second-most species-rich notothenio...
Article
The genetic relationships between the Pacific and the Atlantic populations of marine coastal biota in Southern South America have been analyzed in few studies, most of them relying on a single mitochondrial locus. We analyzed 10 polymorphic microsatellite loci, isolated from a dinucleotide-enriched Eleginops maclovinus genomic library, in a total o...
Article
Fishes of the perciform suborder Notothenioidei, which dominate the ichthyofauna in the freezing waters surrounding the Antarctic continent, represent one of the prime examples of adaptive radiation in a marine environment. Driven by unique adaptations, such as antifreeze glycoproteins that lower their internal freezing point, notothenioids have no...
Article
Full-text available
During the research programme conducted on the OV Puerto Deseado in the summers of 2011 and 2013, 36 stations were sampled using a demersal net at depths between 53–590m in the Antarctic Peninsula and South Shetland Islands.Atotal 3378 fish specimens belonging to 36 species were recorded. Notothenidae was the best-represented family in species numb...
Article
Seasonal growth of Galaxias maculatus in Tierra del Fuego, at the southern limit of its distribution, can be explained by the variation in extrinsic factors, and experiments with fasting in summer conditions would allow researchers to focus on the potential feeding/fasting conditions independent of other seasonal cues, and thus distinguish the effe...
Article
Full-text available
Phylogeography studies add insights into the geographic and evolutionary processes that underline the genetic divergence of populations. This work examines the geographic genetic structure of the Patagonian blennie, Ele-ginops maclovinus, a notothenioid (Perciformes) endemic to South American temperate and sub-Antarctic waters, using mitochondrial...
Article
Full-text available
Eleginops maclovinus, the Patagonian blennie, is a notothenioid (Perciformes) endemic to South American temperate and sub-Antarctic waters. Here, we report ten polymorphic microsatellite loci isolated from a dinucleotide-enriched E. maclovinus genomic library. Among 48 individuals, the number of alleles per locus ranged from eight to 41, and the ob...
Article
Full-text available
Phylogeography studies add insights into the geographic and evolutionary processes that underline the genetic divergence of populations. This work examines the geographic genetic structure of the Patagonian blennie, Eleginops maclovinus, a notothenioid (Perciformes) endemic to South American temperate and sub-Antarctic waters, using mitochondrial D...
Article
Full-text available
The radiation of notothenioid fishes (Perciformes) in Antarctic waters was likely the result of an absence of competition in the isolated Antarctic waters and key traits such as the production of antifreeze glycoprotein and buoyancy modifications. Although notothenioids lack a swim bladder, the buoyancy of Antarctic species, ranging from neutrally...
Article
Different hypotheses attempt to explain how different stages of organisms with complex life cycles respond to environmental changes. Most studies have focused at the among-species level showing similar responses to temperature throughout ontogeny. However, there is no agreement about the pattern expected at the intraspecific scale where a strong se...
Article
Full-text available
In this paper we provide the first report of the presence of exotic Chinook salmon (Oncorhynchus tshawytscha) in two rivers off the Beagle Channel, Lapataia and Ovando, in southern Tierra del Fuego. We also confirm that successful reproduction occurred in the fall of 2007, as we captured yearlings in freshwater. Scale pattern analyses of adult fish...
Article
Full-text available
The energy density (ED) of nine species of sub-Antarctic fishes was estimated by calorimetry. The fish, seven notothenioids, one atherinopsid and one galaxiid, represents some of the more abundant species in the ichthyofauna of the Beagle Channel. Principal-components analysis (PCA) of the ED of the different organs/tissues indicated that PC(1) and...
Article
The present study first addressed the question of whether developmental time (DT) and viability (VT) vary clinally along latitudinal and altitudinal gradients in Drosophila buzzatii, an autochthonous specialist and the generalist invasive Drosophila melanogaster. Coincident and positive altitudinal clines across species and, direct and inverse lati...
Article
Full-text available
Question: Developmental time and metabolic rate are correlated at higher levels of organization. Does this allometric relationship scale down to the intraspecific level? Methods: We exposed flies of three species of Drosophila collected at contrasting altitudes and similar latitudes to varying experimental thermal regimes. Metabolic rate was measur...

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Projects (2)
Project
El presente proyecto propone en esta etapa realizar un muestreo amplio de aproximadamente 800-900 genomas de SARS-CoV2 circulantes en nuestro país, y aprovechando al máximo la capacidad instalada (distribuida federalmente) de: i) Centros de salud donde se realiza la toma muestras y estudios clínico-epidemiológicos (Hospitales habilitados por el MINSAL para la toma de muestra y diagnóstico de SARS-CoV2) ii) Laboratorios con capacidad para secuenciar los genomas de SARS-CoV2 (Laboratorios con equipos de NGS) iii) Instituciones con capacidad para el Procesamiento, Almacenamiento y análisis de datos (Grupos de Bioinformática de las UUNN, SNDG Mincyt e INTA). Además, en línea con los estándares y proyectos internacionales en la temática se propone hacer públicos los datos de secuencias virales para que puedan ser analizados por la comunidad local e internacional.
Project
It is proposed to study how the temperature increase caused by Climate Change could affect the distribution, abundance and importance of different species in the trophic webs, from the study of their current distribution and controlled temperature experiments and measurement of different physiological parameters in selected species. While most of the current studies on global climate change aim essentially at predicting or documenting the change in species distribution, this project also seeks to study the impact of climate change on the ecology and physiology of fish (Genetic and biochemical indicators of stress), organismic (distribution, somatic condition, energy, metabolism, tolerance and thermal preference) and ecosystemic (food webs).