Luz F. Jiménez-Segura

Bio: Luz F. Jiménez-Segura is an academic researcher from University of Antioquia. The author has contributed to research in topics: Floodplain & Drainage basin. The author has an hindex of 11, co-authored 67 publications receiving 469 citations. Previous affiliations of Luz F. Jiménez-Segura include Federal University of Maranhão.

Automatic identification of species with neural networks

Abstract: A new automatic identification system using photographic images has been designed to recognize fish, plant, and butterfly species from Europe and South America. The automatic classification system integrates multiple image processing tools to extract the geometry, morphology, and texture of the images. Artificial neural networks (ANNs) were used as the pattern recognition method. We tested a data set that included 740 species and 11,198 individuals. Our results show that the system performed with high accuracy, reaching 91.65% of true positive fish identifications, 92.87% of plants and 93.25% of butterflies. Our results highlight how the neural networks are complementary to species identification.

Libro Rojo de Peces Dulceacuícolas de Colombia (2012)

Abstract: En el marco del Plan Operativo Anual (2010 – 2011 - 2012) del Programa de Biologia de la Conservacion y Uso de la Biodiversidad del Instituto de Investigacion de Recursos Biologicos Alexander von Humboldt, se llevo a cabo la actualizacion del Libro Rojo de peces dulceacuicolas de Colombia o proceso de evaluacion del riesgo de extincion y evolucion del estado de conservacion de las especies de peces dulceacuicolas, como tambien es conocido. Esta iniciativa se llevo a cabo con el aval del Ministerio de Ambiente, Vivienda y Desarrollo Territorial – MAVT (hoy Ministerio de Ambiente y Desarrollo Sostenible – MADS) y la participacion del Instituto de Ciencias Naturales de la Universidad Nacional de Colombia, WWF Colombia, y la Universidad de Manizales. En este proceso contribuyeron mas de 50 investigadores, vinculados a unas 30 instituciones academicas, gubernamentales y no gubernamentales.

River flooding and reproduction of migratory fish species in the Magdalena River basin, Colombia

Abstract: Jimenez-Segura LF, Palacio J, Leite R. River flooding and reproduction of migratory fish species in the Magdalena River basin, Colombia. Ecology of Freshwater Fish 2010: 19: 178–186. © 2010 John Wiley & Sons A/S Abstract – In most tropical rivers subject to a single-yearly flooding, migratory fish usually spawn in the onset of the flooding and larvae drift to their nursery habitats. To define when the migratory fish species reproduce, its relationship with the water level and when nursery areas in floodplain lakes are supplied with ichthyoplankton in the Magdalena River, a two-yearly peak flooding river, we sampled the ichthyoplankton weekly throughout 2 years. The fish species Pseudoplatystoma magdaleniatum, Prochilodus magdalenae, Leporinus muyscorum, Sorubim cuspicaudus and Curimata mivartii spawn twice a year in the main channel and its larvae input into the floodplain lakes are not always associated with flooding. Spawning in the main channel and larvae inputs into the floodplain lakes suggest that the habitat used by the migratory fishes may be consistent with some hypotheses on habitats used by these fishes.

Freshwater fish faunas, habitats and conservation challenges in the Caribbean river basins of north‐western South America

Abstract: The remarkable fish diversity in the Caribbean rivers of north-western South America evolved under the influences of the dramatic environmental changes of neogene northern South America, including the Quechua Orogeny and Pleistocene climate oscillations. Although this region is not the richest in South America, endemism is very high. Fish assemblage structure is unique to each of the four aquatic systems identified (rivers, streams, floodplain lakes and reservoirs) and community dynamics are highly synchronized with the mono-modal or bi-modal flooding pulse of the rainy seasons. The highly seasonal multispecies fishery is based on migratory species. Freshwater fish conservation is a challenge for Colombian environmental institutions because the Caribbean trans-Andean basins are the focus of the economic development of Colombian society, so management measures must be directed to protect aquatic habitat and their connectivity. These two management strategies are the only way for helping fish species conservation and sustainable fisheries.

Potamodromous migrations in the Magdalena River basin: bimodal reproductive patterns in neotropical rivers.

Abstract: Magdalena River basin potamodromous fishes have two annual reproductive seasons: the subienda in the first half of the year and the mitaca in the second. Both upstream migrations are c. 30-45 days long; after that, with the onset of the rainy season, fishes spawn and remain in the river (resident individuals) or start a downstream movement (the bajanza) to return to the Magdalena floodplain lakes (nursery, shelter and feeding grounds). Due to their particular gonad development the bocachico Prochilodus magdalenae and probably the comelon Leporinus muyscorum are physiologically able to undertake two annual basin migrations. In the presence of dams or hydropower structures, fishes are able to find alternative migration routes. Some species should be re-classified in their migratory behaviour.

Computation And Interpretation Of Biological Statistics Of Fish Populations

Abstract: Thank you for reading computation and interpretation of biological statistics of fish populations. As you may know, people have search numerous times for their favorite books like this computation and interpretation of biological statistics of fish populations, but end up in harmful downloads. Rather than enjoying a good book with a cup of coffee in the afternoon, instead they cope with some infectious bugs inside their laptop.

Review of Research.

Abstract: According to WHO, the permissible limit of arsenic till 1993 was 0.05 mg. /L of drinking water. In 1993, WHO modified the maximum level and brought it down to 0.01 mg./L. According to the report of School of Environment Studies of Jadavpur University (1992-1993), West Bengal has 6 districts, affected by arsenic contamination of ground water. The present paper attempts to find out the vulnerability and impact of arsenic on human being. A detailed survey was conducted at Dahapara village of Murshidabad district to assess the present condition of the area giving emphasis on the identification of sources of arsenic pollution.

A computer vision for animal ecology.

Abstract: 1.A central goal of animal ecology is to observe species in the natural world. The cost and challenge of data collection often limit the breadth and scope of ecological study. Ecologists often use image capture to bolster data collection in time and space. However, the ability to process these images remains a bottleneck. 2.Computer vision can greatly increase the efficiency, repeatability, and accuracy of image review. Computer vision uses image features, such as color, shape, and texture to infer image content. 3.I provide a brief primer on ecological computer vision to outline its goals, tools and applications to animal ecology. 4.I reviewed 187 existing applications of computer vision and divided articles into ecological description, counting, and identity tasks. 5.I discuss recommendations for enhancing the collaboration between ecologists and computer scientists and highlight areas for future growth of automated image analysis. This article is protected by copyright. All rights reserved.