Douglas Rodríguez Olarte- Dr. Conservation Biology
- Professor (Full) at Universidad Centroccidental Lisandro Alvarado
Douglas Rodríguez Olarte
- Dr. Conservation Biology
- Professor (Full) at Universidad Centroccidental Lisandro Alvarado
About
121
Publications
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Introduction
My research is focused on the biogeography, integrity and conservation of freshwater fishes, fluvial ecology and stream biomonitoring.
See more here: http://www.ucla.edu.ve/museopeces/
Current institution
Additional affiliations
January 1997 - December 1997
Instituto Nacional de Parques
Position
- Managing Director
May 1996 - January 1997
August 1997 - February 2020
Education
January 2005 - June 2009
December 2004 - June 2009
Field of study
- Biogeography, integrity and conservation of fishes
September 1993 - July 1996
Field of study
- Ecology and conservation of freshwater fishes
Publications
Publications (121)
We examined physical habitat and fish assemblages in rivers of the Aroa Mountains (Venezuela) with different levels of environmental protection due to the creation of Yurubí National Park within the drainage. We developed an Index of Biotic Integrity (IBI) and evaluated it using principal components analysis (PCA) and canonical correspondence analy...
The effectiveness of protected areas to conserve freshwater fishes is limited because these areas are not usually congruent with regional patterns of fish species richness and distribution. We compared the richness, distribution and abundance of coastal freshwater fishes in a biogeographic province of Venezuela to determine their conservation statu...
Hyphessobrycon scholzei Ahl, the black line tetra, or “Schwarzbandsalmler”, is a well-known tetra in the aquarium hobby, said to be originated from the lower Amazon basin in Pará state, Brazil. The species was for decades common in the aquarium hobby due to the easiness in its maintenance and breeding but reports of wild specimens were few and dubi...
The hydrographic network of Venezuela has an average flow of 40,000 m3/s, including the large rivers of the Orinoco basins and the small mountain streams of the northern part, which support a very diverse aquatic biota. To update the information on this biota, the objectives of the study were: 1) to determine the state of knowledge on river communi...
The Orinoco River has the largest basin in northern South America (981,446 km2) and in its 2150-km length the altitude varies from the sea to 5380 m a.s.l and the precipitation ranges from 512 mm to nearly 5000 mm annually. There are more than 40 major tributaries that drain different geologies and landscapes of Colombia and Venezuela. This chapter...
Several fishes of the family Poeciliidae are commonly produced in ornamental aquaculture and also used for pest control, leading to their introduction in numerous countries. Many of these species exhibit tolerance and invasiveness, as exemplified by Xiphophorus maculatus (Günther, 1866). This report documents the presence of X. maculatus in a Carib...
Reconnaissance on edaphological and biological aspects was carried out in a peatland forest near the town of Piacoa in Delta Amacuro State, southeastern Venezuela. Thirteen peat samples were taken in a stratigraphic transect, using Ramsar peat extraction and analysis protocol to study tropical peatlands. Physicochemical parameters were characterize...
ABSTRACT Reconnaissance on edaphological and biological aspects was carried out in a peat near the town of Piacoa in Delta Amacuro state, southeastern Venezuela. 13 peat samples were taken, in a stratigraphic transept using Ramsar peat extraction and analysis protocol to study tropical peat lands. Physicochemical parameters were characterized with...
In Venezuela, as a country with high vulnerability to climate change, it is expected that it will be affected to different degrees by the events associated with this group of phenomena. Although coastal wetlands are expected to be among the ecosystems that will be most impacted by climate change (and some, such as mangroves and reef banks, are in f...
This presentation deals with the possible scenarios, in the context of climate change, that migratory fish that move from the plains, in the lowlands, to the Venezuelan Andean foothills will face.
RESUMEN
Esta presentación trata sobre los escenarios posibles, en el contexto del cambio climático, que enfrentarán los peces migratorios que se muenven...
The extensive problem of what sand explotation that use fluvial granular material is presented. This activity contributes to the ecological deterioration of the rivers of the Venezuelan Andean foothills and other rivers in the country. To carry out this activity, the riverbeds are dredged, the water currents are diverted and all this constitutes a...
The distribution of fish in the morichal rivers of eastern Venezuela was studied. The data were compared with those found in rivers of the same region but with other physical-chemical conditions, confirming the existence of at least two different assemblages of ichthyofauna. the first associated with rivers with very transparent or tea-colored wate...
Industrial activities, the expansion of the agricultural and urban frontier, alluvial mining, the construction of civil works and food production have negatively affected almost all the world's aquatic systems. Together, these activities have generated the over-sedimentation of rivers, contamination with toxic substances from agricultural practices...
This project is part of the methodological guidelines of CITIZEN SCIENCE and has the objective of developing a methodology to measure the impact that different types of damage have on aquatic systems. The core of the proposal is to apply a qualitative instrument called RATING MATRIX. The construction of this matrix is based on the application of mu...
RESUMEN Las minerías de arenas (areneras) son habituales en ríos de Venezuela. Se utilizaron imágenes satelitales para caracterizar este estresor en ríos de las cuencas del Lago de Maracaibo, Orinoco y vertiente del Caribe. Se detectaron 109 areneras, con la mayor concentración en el río Tuy, donde se estimó una frecuencia de 0,26 areneras por kiló...
Global change drivers including eutrophication, hydrological disturbance, climate change, chemical pollution, overexploitation, invasive species, and land-use change are affecting the function and structure of freshwater ecosystems. South American freshwater ecosystems are especially threatened by the combination of rising human pressures on natura...
We examine, for the first time, biogeographic patterns in a series of tropical montane coastal systems in northern South America. We use amphibians and reptiles, which constitute the most critical communities based upon the prevalence of endemic taxa, to assess the region’s biodiversity. The montane coastal system spans an east-west distance of 925...
El presente informe es una continuación del informe de Aula Abierta, titulado “Situación de los espacios universitarios de conservación ambiental en Venezuela (Enero 2019 – Agosto 2020)” 1, enfocado en la ampliación de espacios documentados y actualización de los ya reportados. En el mismo, se abordan las principales preocupaciones con relación a l...
Pese a esta situación de ausencia u opacidad de información oficial, el presente informe documenta la situación actual de abastecimiento y acceso al agua en las áreas urbanas y
periurbanas adyacentes a los núcleos de formación de las universidades autónomas venezolanas y cuál ha sido la contribución de las casas de estudio en relación con esta
te...
Professional profile (research and interests): Experience: More than 25 years in research, teaching and extension on the continental hydrobiological resources, mainly fluvial freshwater ecosystems and ichthyofauna with orientation in taxonomy, biogeography and ecology, as well as biomonitoring and conservation, aquatic ecosystem integrity, evaluati...
Los estresores ambientales tienen efectos medibles en el ecosistema fluvial y sus organismos, por lo que estos últimos son de interés para estimar la integridad o el estado ecológico de los ríos. En Suramérica los métodos para la evaluación de los ríos varían entre países, con lo cual es necesario conocer cuáles receptores biológicos y ambientales...
Effects of the invasive species Poecilia gillii (Cyprinodontiformes: Poeciliidae) on Pseudopoecilia fria in coastal rivers of the Choco region, Ecuador. One of the causes contributing to the decrease of biodiversity is the introduction of exotic species that often end up being invasive, and end up competing with local species. This competition is n...
The rivers at risk in Venezuela and the route for their conservation. Keywords: Biomonitoring, conservation, ecosystem management, hydrobiological resources.
This report describes the length–weight relationships (LWRs) of 22 freshwater fish species from freshwater western Caribbean drainages in Venezuela. Fishes were collected in dry seasons between 2005 and 2007 with standardized electrofishing from coastal streams of Aroa, Yaracuy and Urama drainages. Results include the first LWR information for ten...
RESUMEN Los Llanos del Orinoco situados al sureste de este rio reciben anualmente una alta pluviosidad, el área puede calificarse de húmeda a muy húmeda (los valores de precipitación oscilan 1200 y más de 3300 mm/año), la región está controlada por el comportamiento de la zona de convergencia intertropical; lo que genera una gran cantidad de ríos y...
Design and testing of a replicable, scalable capacity-building model for species conservation - Volume 50 Issue 4 - Haidy Rojas, Dinora Sánchez, Daniel Lew, José R. Ferrer-Paris, Jon Paul Rodríguez, J. Celsa Señaris, Grisel Velásquez, Douglas Rodríguez-Olarte, Carliz Díaz
The drainages of the eastern coast of Lake Maracaibo of Venezuela are subjected to strong disturbances, especially the loss of riparian forests and transformation of riverbeds, with detrimental effect on river ecosystems, but their conservation status is unknown, limiting appropriate management of regional hydrobiological resources. In the tributar...
A remarkable body of evidence shows that river ecosystems are fundamental in the energy balance of the hydrographic basin and the maintenance of its biological diversity (Naiman et al., 2005). Thus, the fluctuations between periods of drought and rain are expressed in temporary changes in the volumes of water destined for runoff, flooding and (via...
The Misoa River has evident disturbances due to human activities, so it is necessary to assess the conservation status of its rivers and their biotic communities. An index of biotic integrity-benthic (IIB-B), based on aquatic insects as bioindicators was applied. The index metrics was selected based on their variability between sites with the best...
The Misoa River basin has evident disturbances due to human activities, so it is necessary to assess the conservation status of its rivers and biotic communities. An index of benthic biotic integrity (IIB-B), based on aquatic insects as indicators was applied. The index metrics were selected based on their variability between sites with the referen...
Entre los sistemas fluviales llaneros pertenecientes a la Orinoquia venezolana, los ríos de morichal son uno de los principales modeladores del paisaje y son tanto expresión del ambiente como “escultores” de estos espacios, imprimiéndoles un carácter distintivo entre los ámbitos llaneros. Así mismo, son pivotes de la biodiversidad, el flujo geohidr...
Most Andean mountain streams of the Orinoco Basin in Venezuela, had been suffering various disturbances. In spite of this, fish communities have been poorly evaluated in terms of spatial and temporal gradients. Thus, the generation of information about these communities is a priority, since it may support conservation of regional hydrobiological re...
Most Andean mountain streams of the Orinoco Basin in Venezuela, had been suffering various disturbances. In spite of this, fish communities have been poorly evaluated in terms of spatial and temporal gradients. Thus, the generation of information about these communities is a priority, since it may support conservation of regional hydrobiological re...
Análisis de los cambios en las desembocaduras de tres ríos en la costa oriental del Lago de Maracaibo y su relación con la diversidad y tipos de especies que se encuentran en estas desembocaduras
Significant negative impacts in the Turbio River watershed (located in the Andean versant of Orinoco River in Venezuela) require evaluation of the tributaries to achieve adequate management of the hydrobiological resources. During the dry season of 2011, measurements of dimensions, substrate types and coverage, and water quality parameters were tak...
obras civiles y la producción de alimentos han afectado negativamente casi todos los sistemas acuáticos del orbe (Copeland & Dowis 2010, Baynard 2011). Estas actividades en conjunto han generado la sobre sedimentación de ríos producida por la eliminación de vegetación riparina, la contaminación con sustancias tóxicas provenientes de las prácticas a...
This chapter examines the small, local, river fish faunas in the Magdalena and Maracaibo basins in Northern South America (NSA). It analyzes species richness and distribution patterns of the freshwater fishes of the coast of NSA to delimit biogeographic units and relate them to historical and ecological variables. It evaluates the application of te...
This chapter examines the small, local, river fish faunas in the Magdalena and Maracaibo basins in Northern South America (NSA). It analyzes species richness and distribution patterns of the freshwater fishes of the coast of NSA to delimit biogeographic units and relate them to historical and ecological variables. It evaluates the application of te...
A new species, Ancistrus falconensis, is described from the Hueque and Ricoa Rivers, small, isolated Caribbean drainages of northwest Falcón state, (Western Caribbean Zoogeographic Province) Venezuela and compared with A. gymnorhynchus Kner 1854 which occurs in adjacent drainages to the south. Adults of Ancistrus falconensis usually have small ligh...
A new species, Ancistrus falconensis, is described from the Hueque and Ricoa Rivers, small, isolated Caribbean drainages of northwest Falcón state, (Western Caribbean Zoogeographic Province) Venezuela and compared with A. gymnorhynchus Kner 1854 which occurs in adjacent drainages to the south. Adults of Ancistrus falconensis usually have small ligh...
We delineate local and regional biogeographic provinces that suggest patterns of species richness, and primary and secondary freshwater fish distributions along the Caribbean coast of Venezuela. We use presence-absence records and classification and ordination models. Patterns at local and regional scales varied markedly such that primary species d...
In this work we document the original distribution and extend the known range of Creagrutus melasma (Vari, Harold and Taphorn 1994). This species is previously well-known from several drainages in northern Venezuela where some rivers of the Caribbean slope are included. The new range of distribution of the species extends to the cis-andean basins o...
This text presents a taxonomic key for the identification of five species of fish of the genus Creagrutus for the basins of the Yaracuy, Urama, Aroa, Tocuyo, Remedios, Hueque and Ricoa rivers of Venezuela's Midwestern Caribbean basin.
This text presents a taxonomic key for the identification of five species of fish of the genus Creagrutus for the basins of the Yaracuy, Urama, Aroa, Tocuyo, Remedios, Hueque and Ricoa rivers of Venezuela's Midwestern Caribbean basin.
