- Avian ecology and behavior
- Ecology and Vegetation Dynamics Studies
- Plant and animal studies
- Wildlife Ecology and Conservation
- Species Distribution and Climate Change
- Plant and soil sciences
- Wildlife-Road Interactions and Conservation
- Water Resource Management and Quality
- Amphibian and Reptile Biology
- Scarabaeidae Beetle Taxonomy and Biogeography
- Animal Ecology and Behavior Studies
- Fish Ecology and Management Studies
- Animal Behavior and Reproduction
- Climate variability and models
- Plant Parasitism and Resistance
- Conservation, Biodiversity, and Resource Management
- Primate Behavior and Ecology
- Agricultural and Food Production Studies
- Bat Biology and Ecology Studies
- Land Use and Ecosystem Services
- Insect-Plant Interactions and Control
- Insect and Arachnid Ecology and Behavior
- Fire effects on ecosystems
- Fish biology, ecology, and behavior
- Forest Insect Ecology and Management
Pontificia Universidad Javeriana
2012-2023
Universidad del Valle
1984-2017
Fundación para el Desarrollo de la Ecología
2007-2016
Missouri Botanical Garden
2009
Politécnico Colombiano Jaime Isaza Cadavid
2009
Wildlife Conservation Society
1997-2007
Ecopetrol (Colombia)
2006-2007
Alexander von Humboldt Biological Resources Research Institute
1998
University of Florida
1985-1997
We report on the extent of bird extinctions at San Antonio, a fragmented cloud forest site in western Andes Colombia, for which surveys dating back to 1911 and 1959 an available. In 1911, 128 species were present Antonio. Twenty‐four had disappeared by 1959, since then 16 more have gone locally extinct, total 40 or 31% original avifauna. analyzed patterns extinction relation geographic distribution foraging guilds. found that this montane assemblage, being limits altitudinal was main...
ABSTRACT Aim The decrease in species richness with increasing elevation is a widely recognized pattern. However, recent work has shown that there variation the shape of curve, such both negative monotonic or unimodal patterns occur, influenced by variety factors at local and regional scales. Discerning curve may provide clues to underlying causes observed At scales, area altitudinal belts mass effects are important determinants richness. This paper explores relationship between bird...
Abstract Analysis of plant–frugivore interactions provides a quantitative framework for integrating community structure and ecosystem function in terms how the roles attributes individual species contribute to network resilience. In this study, we used centrality metrics rank detect most important mutualistic fruit‐eating birds plants cloud forest Colombian Andes. We identified central core ten bird seven plant 135 that perform dual as local hubs connectors. The were mostly large frugivores,...
Abstract Aim Understanding large‐scale patterns of beta diversity and endemism is essential for ecoregional conservation planning. We present a study spatial faunal diversification biogeographical relationships in the Andean region Colombia. This has great geomorphological complexity, as it formed by several mountain ranges with different geologic origins. hypothesize that this complexity results high turnover species composition among subregions. Location The Colombia, including Santa Marta...
Abstract: The rarity of an organism is widely accepted as a good predictor vulnerability, but has been interpreted in variety ways. Rabinowitz et al. (1986) defined three dimensions for analysis the flora British Isles geographic distribution, habitat specificity, and local population size. They found factors to be independent, that is, each factor provides information not provided by other two. In this paper, method used analyze vulnerability cloud forest avifauna Cordillera Central...
This paper addresses the conservation status of spectacled bear Tremarctos ornatus in northern Andes (Venezuela, Colombia and Ecuador) by analysing degree range fragmentation estimating habitat availability. From satellite images we constructed maps remnant blocks, consisting Andean forest páramo (high elevation shrublands grassland) ecosystems. information was overlain with a road map to determine potential isolation populations, human accessibility model used estimate core area each block....

 As part of a study responses by red howler monkeys (Alouatta seniculus) to forest fragmentation, we studied howlers in an extensive including habitat mosaic old-growth forest, secondary different ages, and non-commercial monospecific plantations exotic Chinese ash (Fraxinus chinensis) pines, produce baseline information on resource use their role as seed dispersers. We followed three troops for six months, encompassing dry wet season; total, they fed 48 species trees, fruits, leaves...
Rates of cutaneous evaporative water loss (EWL) were measured in Anolis carolinensis lizards following their exposure to humid (80%-85% RH) or dry (35%-42% environments. After 8 d acclimation, exposed air had significantly reduced rates EWL, whereas those did not. Acclimation EWL occurred regardless whether conditions allowed dehydrate (to 80% initial mass) and molted. Evaporation from isolated dorsal skin vitro demonstrated that dry-acclimated a lower permeability than humid-acclimated...
Abstract: Beta diversity, or the turnover in species composition among sampling sites a region, is an important criterion for obtaining adequate representation of regional biodiversity systems protected areas. Recently, additive model partitioning (gamma) diversity (in opposition to multiplicative model) has been proposed because it allows direct measure contribution beta gamma diversity. We determined avian along latitudinal (among neighboring river drainages) and elevational axes 1347‐km 2...
Colombian populations of Acorn Woodpeckers (Melanerpes formicivorus flavigula) inhabit the Andes and are geographically isolated from Central American populations. Their diverse food habits include acorns Quercus humboldtii, only oak in Andes. Unlike birds North America, however, do not store or rely heavily upon them. Instead, they feed on insects, sap, fruit year-round. Although woodlands seem to be their preferred habitat, found residing permanently breeding cooperatively other kinds...
Abstract: Determining the permeability of different types landscape matrices to animal movement is essential for conserving populations in fragmented landscapes. We evaluated effects habitat patch size and matrix type on diversity, isolation, dispersal ithomiine butterflies forest fragments surrounded by coffee agroecosystems Colombian Andes. Because ithomiines prefer a shaded understory, we expected highest diversity abundance large shade lowest small sun coffee. also thought would favor...
Understanding the factors that determine population densities is critical for conserving viable populations of threatened species. Half 50 species in family Cracidae have experienced declines. We conducted a literature review to explore relations cracids with body size, habitat, season, and hunting. compiled 103 density data points 27 37 localities from Mexico Argentina. There was no correlation between mass density. The larger cracines tended lower than penelopines, but both subfamilies...
Long-term studies to understand biodiversity changes remain scarce-especially so for tropical mountains. We examined from 1911 2016 in the bird community of cloud forest San Antonio, a mountain ridge Colombian Andes. evaluated effects past land-use change and assessed species vulnerability climate disruption. Forest cover decreased 95% 50% by 1959, 33 were extirpated. From 1959 1990, remained stable, an additional 15 lost-a total 29% community. Thereafter, increased 26% 17 recolonized area....
ABSTRACT The spatial distribution and abundance of animals are in part determined by the their resource base. In Central Andes Colombia, monospecific tree plantations have been used to recover vegetative cover watershed protection programs, but these differ from natural forests structure, composition, resources available wildlife. To evaluate as habitat for wildlife, we compared diversity understory birds, flowers, fruits between juxtaposed 40‐yr‐old patches exotic Chinese ash ( Fraxinus...
Abstract: The fruits of Melastomataceae are consumed by many Neotropical frugivorous birds. Several studies have reported segregated fruiting seasons melastomes, but this pattern is not widespread. phenologies congeneric sympatric species may be an evolutionary response to reduce competition for seed dispersers. Alternatively, aggregated favoured if local fruit abundance attracts more frugivores, thus enhancing dispersal. We monitored melastome in transects over a 2-y period at cloud-forest...