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| Registros recuperados: 2.625 | |
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| Monicka, A.Asha; Pandiarajan, T; Solomon, A. Brusly; Ganapathy, S. |
| Manual grading of dehusked coconut often leads to low profit than expected by the farmers. Appropriate grading systems guarantee a better income for the coconut growers. Therefore, a simple machine was designed and developed to grade the de-husked coconut based on its weight. The developed grader consists of an electronic weighing assembly, carrier cups with four bar linkage mechanism, proximity sensor, pneumatic actuators, and drive mechanism. Before the fabrication of grader, the tilt angle of carrier cup mechanism was optimised to ensure a free falling behaviour of dehusked coconut. The performance test of weight grader was conducted by varying the angular velocities of carrier cups (12, 14 and 16 rad/min) and signal settling time of the load cell (2, 3... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 2021 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6591 |
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| Hernández-Ardila,Laura Valentina; Barragán-Barrera,Dalia C.; Negrete,Javier; Poljak,Sebastián; Riet-Sapriza,Federico G.; Caballero,Susana. |
| ABSTRACT The leopard seal (Hydrurga leptonyx) is a genetically low-studied species. In order to conduct the first genetic diversity assessment of this species in Danco Coast (Antarctic Peninsula), 423 bp of the mitochondrial DNA Control Region (mtDNA-CR) was sequenced from 13 blood samples collected in Primavera Base (62º15’S, 58º39’W) during the 2011-2012 austral summer. Our results showed high haplotype diversity (h = 0.99), with various divergent haplotypes. Our findings suggest that leopard seals in the Danco Coast could represent different phylogroups; however, including more genetic markers are needed to confirm this hypothesis. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Seal; Pinnipeds; MtDNA; Control Region; Antarctica.. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300227 |
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| Rodrigo,Cristian; Varas-Gómez,Andrés; Grisales,César; Quintana-Saavedra,Diana; Molares,Ricardo. |
| ABSTRACT Global atmospheric warming and rising ocean temperatures can contribute to the acceleration of glacier melting and influence the generation and physical characteristics of sediment flows in bays and fjords of the Antarctic Peninsula. During the First Scientific Expedition of Colombia to the Antarctic, carried out between January and February 2015, hydrographic variables (temperature, salinity, pressure and turbidity) were measured in the water column, from very close to the main glacier front towards the offshore, on 5 bays of the Danco Coast, Western Antarctic Peninsula. Glacimarine sediment plumes from the tidewater glacier were identified in all bays, however, with varying spatial extensions as well as the concentration of sediments, being... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glacimarine environment; Sediment plume; Turbidity; Oceanographic Variable; Tidewater Glacier.. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300149 |
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| Millán,Santiago; Rodríguez-Rodríguez,Jenny Alexandra; Sierra-Correa,Paula. |
| ABSTRACT This article describes the cartographic layer construction process of Colombian Caribbean coastal wetlands at a scale of 1:100,000 and the results obtained in terms of their quantification and typing. Two cartographic layers were constructed and subsequently joined, one of the permanent water bodies and another of temporary water bodies and associated coverages. The layers were generated by multitemporal analysis of 45 Landsat 8-OLI satellite images, based on the NDVI index, uncertainty models by superposition of cartographic attributes, and a flood frequency consultation model on ALOS PALSAR 1 images. As a result, 576,279 ha of coastal wetlands were delimited (1.9 % of total wetlands in Colombia), of which 20.4 % are within protected areas. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mangroves; Coastal floodplains forest; Water bodies; Geographic Information Systems (GIS); Protected areas. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000100121 |
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| González G.,Roy; Bermúdez Tobón,Adriana; Navas-S.,Gabriel R.. |
| ABSTRACT Rachycentron canadum is an economically important fish in aquaculture due to its resistance to environmental variations, the feasibility of culture in confinement, high growth rates, and good acceptance by consumers. The profitability of their cage culture is negatively affected by the difficulty of implementing monosex cultures due to the apparent similarity between sexes. In this study, morphometric techniques were used to determine sexual dimorphism by analyzing measurements and the fish’s shape. Differences were found between the sexes in the position of the eyes, lips, pectoral fin and ventral fin, and the body’s general shape. The sexing precision of the individuals was 75.4 % with distances and 82.7 % with geometric morphometry. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cobia; Geometric morphometry; Distances morphometrics; Colombian Caribbean.. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000100079 |
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| Gómez Luna,Liliana; Zapata Palanqué,Alejandro; Corona Ochoa,Zelma Celia; Álvarez Arencibia,Yailyn; Bouza Alonso,José Antonio; Beyris Mazar,Alberto. |
| ABSTRACT The Baconao Lagoon is a tropical, coastal and littoral ecosystem which receives continuous natural and human perturbations; favoring the eutrophication process, and consequently, the phytoplankton proliferation. The starting point of this research begins with a massive fish kill report into the lagoon on May 2017, being the main objective to document the implementation of a risk management protocol for the phycotoxin presence, adapted to the ecosystem conditions, considering the characterization of the risk event, focusing on mitigation and prevention of negative impacts. The presence of a mix Harmful Algal Bloom (HAB) in remission was confirmed, with negative implications to the entire ecosystem. It was identified the presence of abundant motile... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cyanobacteria; Harmful Algal Bloom (HAB); Gymnodinium sp.; Karlodinium micrum; Baconao Lagoon.. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000100043 |
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| Mojica-Moncada,Diego F.; Cárdenas,Carlos; Mojica-Moncada,Jhon F.; Brondi,Fabian; Barragán-Barrera,Dalia C.; Marangunic,Cedomir; Holland,David; Franco Herrera,Andrés; Casassa,Gino. |
| ABSTRACT In the western Antarctic Peninsula one of the areas the highest warming in the southern hemisphere has been identified. To characterize this tendency, we selected the Lange Glacier (LG) on King George Island, to evaluate: 1) LG surface temperature and dynamics using stakes with temperature data loggers; 2) LG submerged thickness and sea parameters through bathymetry (BT) and 29 CTD stations in front of LG; 3) glacier front (GF) using BT and a Digital Elevation Model (DEM); 4) change in GF position using DEM and historical data of GF width; 5) Calving flux (QC). Our findings showed 85 % of temperatures were above the 0 °C melting point (mean = 5.0 ± 5.2 °C). The stakes had an average ice loss of 9.3 ± 1.3 cm. The LG mean dynamics was 8.8 ± 1.5 m... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lange Glacier; Melting; Climate change; Calving flux; Antarctica. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300059 |
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| Ladino Archila,Felipe; Martínez-Mondragón,Sandra Bibiana; Duarte-Fajardo,María Alejandra; Vélez,Natalia; Bessudo Lion,Sandra. |
| ABSTRACT To determine trends over time in the relative abundance of species prioritized in the Malpelo Fauna and Flroa Sanctuary Management Plan, underwater visual censuses were done from April 2009 to August 2019. Data were collected for five species of bonefish: bluefin trevally (Caranx melampygus), longfin yellowtail (Seriola rivoliana), yellowfin tuna (Thunnus albacares), leather bass (Dermatolepis dermatolepis) and sailfin grouper (Mycteroperca olfax), and six cartilaginous fish: spotted eagle ray (Aetobatus laticeps), silky shark (Carcharhinus falciformis), Galapagos shark (Carcharhinus galapagensis), whitetip reef shark (Triaenodon obesus), whale shark (Rhincodon typus) and scalloped hammerhead shark (Sphyrna lewini). A negative non-significant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Marine protected area; Relative species abundance; Frequency of observation; Tropical Eastern Pacific.. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000100105 |
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| Arteaga-Flórez,Catalina; Bolaño-Lara,Maryela. |
| ABSTRACT Polychaeta represents the most diverse class in the phylum Annelida, mainly composed by marine organisms, with some terrestrial and freshwater representatives. The present work records the information of the benthic polychaetes, which were collected in four stations in the northern sector of the Antarctic Peninsula, in the III Expedición “Admiral Padilla” verano austral 2016-2017, including taxonomy, relative abundance and frequency of occurrence by family. A total of 326 individuals were quantified, distributed in 12 families: Apistobranchidae, Capitellidae, Cirratulidae, Dorvilleidae, Maldanidae, Nereididae, Orbiniidae, Paraonidae, Serpulidae, Sigalionidae, Spionidae and Syllidae, and the suborder Terebelliformia. Cirratulidae, and Paraonidae... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Marine benthos; Macrofauna; Annelida; Biodiversity; Biogerlache.. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000300221 |
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| Registros recuperados: 2.625 | |
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