Geociencias y Biodiversidad (GEBI)

URI permanente para esta comunidad

https://hdl.handle.net/10784/765

Se enfoca en generar conocimiento básico y aplicado orientado a la solución de problemas y al entendimiento de aspectos relacionados con la biodiversidad y su conservación, el cambio climático ambiental global, los recursos energéticos y los sistemas hídricos, incluyendo estrategias de apropiación social de conocimiento y educación para la sostenibilidad.

Líneas de investigación: Ambiente, Biodiversidad y Conservación, Geociencias, Recurso Hídrico, Recursos Minerales, Energéticos y Cambio Climático.
Código Minciencias: COL0000185.
Categoría 2021: A.
Escuela: Ciencias.
Líder: Alejandra María Carmona Duque.
Correo electrónico: amcarmonad@eafit.edu.co

Fusión de los grupos: Hidrología de los Andes del Norte (Hyna); Biodiversidad, Evolución y Conservación; Geología Ambiental y Tectónica (2025)

Noticias

https://www.eafit.edu.co/sistema-ciencia-tecnologia-innovacion/investigacion/grupos-investigacion/geociencias-biodiversidad-gebi
https://scienti.minciencias.gov.co/gruplac/jsp/visualiza/visualizagr.jsp?nro=00000000008096

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Mostrando 1 - 20 de 314

A Revision of Philander (Marsupialia: Didelphidae), Part 1: P. quica, P. canus, and a New Species from Amazonia
(American Museum of Natural History, 2018-01-31) Voss, R.S.; Díaz-Nieto, J.F.; Jansa, S.A.; Universidad EAFIT. Departamento de Ciencias; Biodiversidad, Evolución y Conservación
This is the first installment of a revision of the didelphid marsupial genus Philander, commonly known as gray four-eyed opossums. Although abundant and widespread in lowland tropical forests from southern Mexico to northern Argentina, species of Philander are not well understood taxonomically, and the current literature includes many examples of conflicting species definitions and nomenclatural usage. Our revision is based on coalescent analyses of mitochondrial gene sequences, phylogenetic analyses of mitochondrial and nuclear genes, morphometric analyses, and firsthand examination of relevant type material. Based on these results, we provisionally recognize eight species, of which three are formally treated in this report: P. quica (Temminck, 1824), an Atlantic Forest endemic formerly known as P. frenatus (Olfers, 1818); P. canus (Osgood, 1913), a widespread species formerly treated as a synonym or subspecies of P. opossum (Linnaeus, 1758); and P. pebas, a new species endemic to Amazonia. The remaining, possibly valid, species of Philander can be allocated to two clades. The first is a cis-Andean complex that includes P. andersoni (Osgood, 1913); P. mcilhennyi Gardner and Patton, 1972; and P. opossum. The second is a trans-Andean complex that includes P. melanurus (Thomas, 1899) and P. pallidus (Allen, 1901). Among other nomenclatural acts, we designate a neotype for the long-problematic nominal taxon Didelphis superciliaris Olfers, 1818, and (in an appendix coauthored by Renate Angermann), we establish that Olfers' coeval binomen D. frenata is based on an eastern Amazonian type and is a junior synonym of P. opossum. © American Museum of Natural History 2018.
A REVISION OF THE DIDELPHID MARSUPIAL GENUS MARMOSA PART 2. SPECIES OF THE RAPPOSA GROUP (SUBGENUS MICOUREUS)
(AMER MUSEUM NATURAL HISTORY, 2020-06-01) Voss, Robert S.; Giarla, Thomas C.; Diaz-Nieto, Juan F.; Jansa, Sharon A.; Universidad EAFIT. Departamento de Ciencias; Biodiversidad, Evolución y Conservación
In this report, the second of a revisionary series on mouse opossums (Marmosa), we analyze cytochrome b sequence data from 166 specimens of the subgenus Micoureus and delimit putative species using the multirate Poisson Tree Processes (mPTP) method. That analysis identifies 21 putative species, many of which can be matched with available names, including alstoni, constantiae, demerarae, limae, germana, meridae, paraguayana, parda, perplexa, phaea, rapposa, and rutteri. However, some of these nominal taxa are not morphologically diagnosable, and in the absence of other corroborating evidence, we do not recommend that they all be recognized as valid. Phylogenetic analyses of a multigene dataset suggest that putative species of Micoureus belong to several wellsupported clades, one of which (the ``Rapposa Group'') is revised in this report. As defined herein, the Rapposa Group includes at least three valid species: M. rapposa Thomas, 1899 (including budini Thomas, 1920); M. parda Tate, 1931; and M. rutteri Thomas, 1924. Herein we document their ecogeographic distributions and diagnostic traits, comment on their taxonomic histories, and list the specimens we examined (including all relevant type material).
A Revision of the Didelphid Marsupial Genus MarmosaPart 2. Species of the Rapposa Group (Subgenus Micoureus)
(AMER MUSEUM NATURAL HISTORY, 2020-01-01) Voss, R.S.; Giarla, T.C.; Diáz-Nieto, J.F.; Jansa, S.A.; Universidad EAFIT. Departamento de Ciencias; Biodiversidad, Evolución y Conservación
In this report, the second of a revisionary series on mouse opossums (Marmosa), we analyze cytochrome b sequence data from 166 specimens of the subgenus Micoureus and delimit putative species using the multirate Poisson Tree Processes (mPTP) method. That analysis identifies 21 putative species, many of which can be matched with available names, including alstoni, constantiae, demerarae, limae, germana, meridae, paraguayana, parda, perplexa, phaea, rapposa, and rutteri. However, some of these nominal taxa are not morphologically diagnosable, and in the absence of other corroborating evidence, we do not recommend that they all be recognized as valid. Phylogenetic analyses of a multigene dataset suggest that putative species of Micoureus belong to several well-supported clades, one of which (the "Rapposa Group") is revised in this report. As defined herein, the Rapposa Group includes at least three valid species: M. rapposa Thomas, 1899 (including budini Thomas, 1920); M. pardaTate, 1931; and M. rutteriThomas, 1924. Herein we document their ecogeographic distributions and diagnostic traits, comment on their taxonomic histories, and list the specimens we examined (including all relevant type material). © 2020 American Museum of Natural History.
A revision of the didelphid marsupial genus Marmosops part 1. Species of the subgenus Sciophanes.
(AMER MUSEUM NATURAL HISTORY, 2016-05-01) Diaz, Juan Fernando; Universidad EAFIT. Departamento de Ciencias; Biodiversidad, Evolución y Conservación
Ambientes de acumulación y foraminíferos bentónicos de la Formación Tubará (Plioceno del Valle Inferior del Magdalena
(Universidad Industrial de Santander, 2007-01-01) Martinez, Jose Ignacio; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
An Entropy-Based Graph Construction Method for Representing and Clustering Biological Data
(SPRINGER, 2019-10-01) Ariza-Jiménez L.; Pinel N.; Villa L.F.; Quintero O.L.; Universidad EAFIT. Departamento de Ciencias; Biodiversidad, Evolución y Conservación
Unsupervised learning methods are commonly used to perform the non-trivial task of uncovering structure in biological data. However, conventional approaches rely on methods that make assumptions about data distribution and reduce the dimensionality of the input data. Here we propose the incorporation of entropy related measures into the process of constructing graph-based representations for biological datasets in order to uncover their inner structure. Experimental results demonstrated the potential of the proposed entropy-based graph data representation to cope with biological applications related to unsupervised learning problems, such as metagenomic binning and neuronal spike sorting, in which it is necessary to organize data into unknown and meaningful groups. © 2020, Springer Nature Switzerland AG.
An environmental magnetism approach to assess impacts of land-derived sediment disturbances on coral reef ecosystems (Cartagena, Colombia).
(Elsevier Inc., 2018-06-01) Mejia, Daniela; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
ANISOTROPÍA DE SUSCEPTIBILIDAD MAGNÉTICA (ASM) DEL MIEMBRO SUPERIOR DE LA FORMACIÓN AMAGÁ, SECCIÓN QUEBRADA SABALETICAS, SW ANTIOQUEÑO Y SU RELACION CON LOS MOVIMIENTOS DEL SISTEMA DE FALLAS ROMERAL EN EL CENOZOICO TARDIO
(Geological Engineering Curriculum Program, Geosciences and Environment College of Mines Faculty, National University of Colombia - Medellin Headquarters, 2012-12-01) Marín, María Isabel; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
APORTES AL CONOCIMIENTO D ELA EVOLUCIÓN GEOLÓGICA DE LAS CUENCAS ATRATO Y SAN JUAN DEL ARCO PANAMÁ-CHOCÓ
(Universidad Industrial de Santander, 2009-12-01) BEDOYA, OSCAR GEOVANY; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
APORTES AL CONOCIMIENTO DE LA EVOLUCIÓN GEOLÓGICA DE LAS CUENCAS ATRATO Y SAN JUAN DENTRO DEL ARCO PANAMÁ-CHOCÓ
(Universidad Industrial de Santander, 2009-01-01) Sierra, Gloria Maria; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Application of methodologies of social appropriation of geological sciences and museum geoheritage: case Historical Museum of El Penol, Antioquia
(Geological Engineering Curriculum Program, Geosciences and Environment College of Mines Faculty, National University of Colombia - Medellin Headquarters, 2019-08-01) Angel Tavera-Escobar, Miguel; David Montoya-Campo, Juan; Isabel Marin-Ceron, Maria; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
The museum's potential as a geographic epicenter and of social development, allowed the application of educational strategies through: physical interventions, training and implementation of informative resources in the existing geological collections; with the purpose of carrying out a dialogue of knowledge that will broaden the understanding of the territory by residents and visitors. These strategies were based on a review of the geological information of Antioquia Eastern focused on the genesis and evolution of the main geoforms. In carrying out the present work it is recommended the integration of mechanisms that facilitate the application of the National Guidelines of Social Appropriation of Geological Sciences in places like the Museum of El Penol, considering that they play a role as mediators of geological knowledge in rural Colombia.
The Arboletes-Punta Rey Littoral, Southern Caribbean Coast
(SPRINGER, 2016-01-01) Arango, I.D.C.; Paniagua-Arroyave, J.F.; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
The Arboletes-Punta Rey littoral is a 5.5-km-long stretch of coast located at the southern Caribbean coast of Colombia, 80 km by car (paved road) to Monteria. Geologically, it is located at terrains of the Sinu folded belt, a tectonically active sedimentary wedge evolving under the morphogenetic influence of numerous onshore and offshore manifestations of mud diapirism. It has a tropical climate. During the dry season (December-April), the zone is under the influences of the N-NE Trade winds that generate swells with wave periods between 6 and 9 s and significant wave heights up to 2 m. These waves are strongly modified by the serrated contours of the coastline and are rapidly eroding the beaches and littoral rocky formations of the area. During the wet season, the trade winds are replaced by lighter, 2-4 m/s, S to SW winds that generate seas with significant wave heights of up to 0.6 m. Net sand drift during the year in the area is toward the SW. The Arboletes-Punta Rey landscape is configured by an emerged marine terrace, a diapiric dome with active mud volcanoes, and by cliffs and their associated erosional features including caves, arches, stacks, and scarps of mass movements. These features are cut on sedimentary, highly weathered and densely fractured mudstones and shales, and in poorly consolidated diapiric muds. Besides its geomorphological interest, the Arboletes littoral is an interesting example of historical, kilometric-magnitude erosional coastline changes driven by the combination of natural-and man-induced causes including, in a short-term perspective, the poor geotechnical properties of rocks, bioerosion, absence of rainfall and waste waters management, strong wave action, beach sand mining, and inadequate coastal engineering practices.
Arrastrando la Montaña hacia el Mar
(Agenda del Mar Comunicaciones, 2017-11-01) Restrepo, Juan Darío
Aspectos geomorfológicos de la avenida torrencial del 31 de Enero de 1994 en la cuenca del rÍo Fraile y sus fenómenos asociados
(Universidad EAFIT, 2004-01-01) Hermelin, Michel; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica
Assessing and managing scenery of the Caribbean Coast of Colombia
(Elsevier, 2012-05-18) Rangel-Buitrago, Nelson; Correa-Arango, Ivan D.; Anfuso, Giorgio; Williams, Allan T.; Ergin, Aysen; Universidad EAFIT. Departamento de Geología; Ivan D. Correa-Arango (iarango@eafit.edu.co); Ciencias del Mar
This study provides the coastal scenery assessment of 135 sites along the Colombian Caribbean littoral by analysing 26 physical and human factors. Sites were categorised into ﬁve classes from Class 1, top grade scenery, to Class 5, poor scenery -- Fifty ﬁve percent of the investigated coastal areas were included in Classes 1 and 2, 18% belonged to Class 3 and 47% of the sites fall into Classes 4 and 5 -- Classiﬁcation of analysed sites depends on the geological setting and the degree of human occupation -- Classes 1 and 2 sites are located in natural protected areas in La Guajira and Magdalena departments -- Low classiﬁcation recorded at Classes 3, 4 and 5 corresponds to a progressive decrease of both natural and (especially) human parameters -- Concerning coastal management issues, emphasis should be given to the upgrading of human parameters eliminating litter and sewage evidences, vegetation debris and enhancing beach nourishment works
Assessing and managing scenery of the Caribbean Coast of Colombia
(Butterworth-Heinemann, 2013-01-01) Rangel-Buitrago, N.; Correa, I.D.; Anfuso, G.; Ergin, A.; Williams, A.T.; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
This study provides the coastal scenery assessment of 135 sites along the Colombian Caribbean littoral by analysing 26 physical and human factors. Sites were categorised into five classes from Class 1, top grade scenery, to Class 5, poor scenery. Fifty five percent of the investigated coastal areas were included in Classes 1 and 2, 18% belonged to Class 3 and 47% of the sites fall into Classes 4 and 5. Classification of analysed sites depends on the geological setting and the degree of human occupation. Classes 1 and 2 sites are located in natural protected areas in La Guajira and Magdalena departments. Low classification recorded at Classes 3, 4 and 5 corresponds to a progressive decrease of both natural and (especially) human parameters. Concerning coastal management issues, emphasis should be given to the upgrading of human parameters eliminating litter and sewage evidences, vegetation debris and enhancing beach nourishment works. © 2012 Elsevier Ltd.
Assessing the effect of sea-level change and human activities on a major delta on the Pacific coast of northern South America: The Patía River
(ELSEVIER SCIENCE BV, 2012-05-15) Restrepo A, Juan D.; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
This paper presents the main physical and human-induced stresses that have shaped the recent evolution of the Patía River delta, the largest and best-developed delta on the western margin of South America. During the Holocene, the Patía Delta moved southward and the northern part became an estuarine system characterized by large extensions of mangrove ecosystems. However, a major human-induced water diversion, starting in 1972, diverted the Patía flow to the Sanguianga River, and shifted the active delta plain back to its former Holocene location. This discharge diversion has led to sediment starvation of the southern delta lobe and changed the northern estuarine system into an active delta plain. In addition, coastal areas of the Patía delta subsided as a result of a devastating tsunami in 1979. Morphological changes along the delta coast are evidenced by: (1) coastal retreat along the whole delta front during the period 1986-2001; (2) coastal retreat along the abandoned delta lobe for the period 2001-2008; 56% of the southern delta shoreline is retreating and only 4% of the coast shows signs of accretion; (3) progradation of the northern delta region during the period 2001-2008; the discharge diversion of the Patía River to the Sanquianga has apparently balanced the observed trends in coastal erosion and sea-level rise (5.1mmyr -1 for the period 1984-2006, after the 1979 tsunami); (4) formation of transgressive barrier islands with exposed peat soils in the surf zone; and (5) abandonment of former active distributaries in the southern delta plain with associated inlet closure. In the northern delta lobe, major geomorphic changes include: (1) distributary channel accretion by morphological processes such as sedimentation (also in crevasses), overbank flow, increasing width of levees, inter-distributary channel fill, and colonization of pioneer mangrove; (2) freshening conditions in the Sanguianga distributary channel, a hydrologic change that has shifted the upper estuarine region (salinity<1psu) downstream; and (3) changes in vegetation succession; approximately 30% of mangrove forests in the current delta apex have been replaced by freshwater vegetation. Overall, the recent evolution of the Patía has been controlled by the interplay of (1) high basin-wide sediment load; (2) low discharge variability (Q max/Q min); (3) spatial switch of delta distributaries related to tectonic movements and subsidence; (4) a relative sea-level rise of 5.1mmyr -1 after the occurrence of the 1979 tsunami; (5) episodes of sea-level rise associated with the ENSO cycle; and (6) human-induced discharge diversion. The information presented here is valuable evidence for understanding the role of extreme events versus 'normal' conditions in creating and shaping deltas. © 2012 Elsevier B.V.
Atlantic Multidecadal Oscillation (AMO) forcing on the late Holocene Cauca paleolake dynamics, northern Andes of Colombia
(Copernicus GmbH, 2015-01-01) Martínez J.I.; Obrochta S.; Yokoyama Y.; Battarbee R.W.; Universidad EAFIT. Departamento de Geología; Ciencias del Mar
The Atlantic Multidecadal Oscillation (AMO), is a major driving climate mechanism, in the eastern Caribbean Sea and the South Atlantic Ocean in relation to the dynamics of the South American Monsoon System (SAMS) for the late Holocene. Here we document the AMO signal in the San Nicolás-1 core of the Cauca paleolake (Santa Fé-Sopetrán Basin) in the northern Andes. Wavelet spectrum analysis of the gray scale of the San Nicolás-1 core provides evidence for a 70 yr AMO periodicity for the 3750 to 350 yr BP time interval, whose pattern is analogous to the one documented for the Cariaco Basin. This supports a possible correlation between enhanced precipitation and ENSO variability with a positive AMO phase during the 2000 to 1500 yr BP interval, and its forcing role on the Cauca ria lake deposits, which led to increased precipitation and to the transition from a igapo (black water) to a varzea (white water) environment ca. 3000 yr BP. © Author(s) 2015.
Bacillus subtilis EA-CB0575 genome reveals clues for plant growth promotion and potential for sustainable agriculture
(Springer, 2020-01-01) Franco-Sierra, N.D.; Posada, L.F.; Santa-María, G.; Romero-Tabarez, M.; Villegas-Escobar, V.; Álvarez, J.C.; Universidad EAFIT. Departamento de Ciencias; Biodiversidad, Evolución y Conservación
Bacillus subtilis is a remarkably diverse bacterial species that displays many ecological functions. Given its genomic diversity, the strain Bacillus subtilis EA-CB0575, isolated from the rhizosphere of a banana plant, was sequenced and assembled to determine the genomic potential associated with its plant growth promotion potential. The genome was sequenced by Illumina technology and assembled using Velvet 1.2.10, resulting in a whole genome of 4.09 Mb with 4332 genes. Genes involved in the production of indoles, siderophores, lipopeptides, volatile compounds, phytase, bacilibactin, and nitrogenase were predicted by gene annotation or by metabolic pathway prediction by RAST. These potential traits were determined using in vitro biochemical tests, finding that B. subtilis EA-CB0575 produces two families of lipopeptides (surfactin and fengycin), solubilizes phosphate, fixes nitrogen, and produces indole and siderophores compounds. Finally, strain EA-CB0575 increased 34.60% the total dry weight (TDW) of tomato plants with respect to non-inoculated plants at greenhouse level. These results suggest that the identification of strain-specific genes and predicted metabolic pathways might explain the strain potential to promote plant growth by several mechanisms of action, accelerating the development of plant biostimulants for sustainable agricultural. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
Bahía de Cartagena (Colombia): distribución de sedimentos superficiales y ambientes sedimentarios
(UNIV CATOLICA DE VALPARAISO, 2013-01-01) CORREA, IVAN DARIO; Universidad EAFIT. Departamento de Geología; Ciencias del Mar

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