Marianela Velilla

Marianela Velilla
The University of Arizona | UA · School of Natural Resources and the Environment

MS Wildlife Ecology & Conservation. University of Florida

About

23
Publications
25,157
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219
Citations
Introduction
Reducing jaguar persecution in the Paraguayan Dry Chaco through the development of socially and environmentally viable schemes to mitigate jaguar-rancher conflict.

Publications

Publications (23)
Article
Full-text available
Mammalian carnivores are considered a key group in maintaining ecological health and can indicate potential ecological integrity in landscapes where they occur. Carnivores also hold high conservation value and their habitat requirements can guide management and conservation plans. The order Carnivora has 84 species from 8 families in the Neotropica...
Article
Full-text available
Habitat destruction and overexploitation are the main threats to biodiversity and where they co-occur, their combined impact is often larger than their individual one. Yet, detailed knowledge of the spatial footprints of these threats is lacking, including where they overlap and how they change over time. These knowledge gaps are real barriers for...
Article
Full-text available
Xenarthrans—anteaters, sloths, and armadillos—have essential functions for ecosystem maintenance, such as insect control and nutrient cycling, playing key roles as ecosystem engineers. Because of habitat loss and fragmentation, hunting pressure, and conflicts with domestic dogs, these species have been threatened locally, regionally, or even across...
Article
Full-text available
Xenarthrans—anteaters, sloths, and armadillos—have essential functions for ecosystem maintenance, such as insect control and nutrient cycling, playing key roles as ecosystem engineers. Because of habitat loss and fragmentation, hunting pressure, and conflicts with domestic dogs, these species have been threatened locally, regionally, or even across...
Article
Full-text available
Aim Understanding how habitat loss and overhunting impact large carnivores is important for broad‐scale conservation planning. We aimed to assess how these threats interacted to affect jaguar habitat (Panthera onca) between 1985–2013 in the Gran Chaco, a deforestation hotspot. Location Gran Chaco ecoregion in Argentina, Paraguay and Bolivia. Meth...
Chapter
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Redlist of threatened species of mammals of Paraguay based in the IUCN criteria for the RedList (National level workshop)
Chapter
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Redlist for threatened species of mammals of Paraguay. Chapter related to Carnivora species.
Chapter
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Redlist species of threatened mammals of Paraguay: Cetartiodactyla and Perissodactyla, ungulates.
Chapter
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Se evaluaron 179 especies, teniendo al tapiti Sylvilagus brasiliensis y al Dasypus septemcinctus como especies no evaluadas NE (ver capítulo Xenarthra). Entre las especies evaluadas, se resalta que 29 especies fueron catalogadas como Datos Insuficientes o DD, esto significa que la información disponible sobre estas especies en nuestro país es tan e...
Chapter
Full-text available
We analyzed the distribution patterns of primates and their conservation status Alouatta caraya, Aotus azarae, Mico melanurus, Sapajus cay, and Callicebus pallescens in Paraguay. We employed a maximum likelihood estimator to understand species distributions based upon observational records. Threats and the presence of species in protected areas wer...
Article
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We employed least-cost and circuit theory modeling to model connectivity among previously defined Jaguar Conservation Units (JCUs) at the southern limit of the jaguar’s range in Argentina, Bolivia, Brazil and Paraguay, to assess the effects of deforestation and land use change from 2000 to 2014. Due to uncertainty over possible limitations to jagua...
Article
Full-text available
El pecarí del Chaco conocido localmente en Para-guay como tagua (Catagonus wagneri) es una es-pecie en peligro de extinción endémica del Chaco Americano, cuya situación se mantiene en dete-rioro como consecuencia de la pérdida y transfor-mación de su hábitat y de la caza excesiva en toda su área de distribución. Este trabajo presenta los resultados...
Article
Full-text available
Abstract The Chacoan peccary (Catagonus wagneri), or Tagua, an endemic species living in the Chaco ecoregion, is endangered by highly increasing deforestation rates across the region, particularly in the last decade. This situation highlights the need to better understand the current distribution of the species, as well as how environmental conditi...
Chapter
Full-text available
The forests of the western Amazonia, from Colombia south through Ecuador, Peru and Bolivia, are home to at least 30 taxa of pitheciines of the genera Pithecia, Cacajao and Callicebus. The primary threat to these monkeys is habitat destruction, although hunting further threatens populations in some areas. One taxon in this region is considered criti...
Article
Full-text available
The nurse effect is a positive interaction in which one plant (the nurse) provides conditions that enhance the establishment and growth of another plant species (Callaway 1995). Increased environmental severity appeared to increase the strength of nurse effects (Brooker et al . 2008, Lortie & Callaway 2006). On the one hand, the impact of the nurse...

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Projects

Projects (4)
Project
Objetivos generales: 1) Estimar el uso de hábitat del yaguareté y puma en paisajes fragmantados del Chaco paraguayo. 2) Establecer áreas clave para la conservación a largo plazo de yaguareté y puma en el Chaco paraguayo. Objetivos específicos: 1) Obtener y comparar estimaciones de área de vida y selección de hábitat del yaguareté y puma. 2) Comparar la eficacia de metodologías para la estimación de la área de utilización y selección de hábitat. 3) Producir un diseño del paisaje utilizando una clasificación de áreas importantes y corredores para la conservación de yaguareté y puma. 4) Evaluar posibles escenarios para el yaguareté y el puma bajo distintas modalidades de gestión.
Project
Contribuir a la problemática del conflicto entre el ganado y los carnívoros en el Pantanal Paraguayo, mediante un método analítico y participativo de los grupos afectados. Objetivos específicos a)caracterizar las prácticas ganaderas (manejo) más empleadas en el Pantanal Paraguayo. b)cuantificar la pérdida de ganado por ataques de carnívoros y caracterizar las percepciones de los productores hacia los carnívoros, en las áreas seleccionadas. c)cuantificar la presencia y abundancia de especies presa nativas (ungulados en su mayoría) en áreas con y sin ganado. d) promover la participación activa de ganaderos y otro grupos de la zona de estudio (Pantanal) a través de un marco analítico e inclusivo para determinar acciones concretas que minimicen los conflictos.