Juan D. Carvajal-Quintero

German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig | iDiv · sDiv - Synthesis Center

Tropical lands harbour the highest number of species, resulting in the ubiquitous latitudinal diversity gradient (LDG). However, exceptions to this pattern have been observed in some taxa, explained by the interaction between the evolutionary histories and environmental factors that constrain species' physiological and ecological requirements. Here...

Biotic responses to global change include directional shifts in organismal traits. Body size, an integrative trait that determines demographic rates and ecosystem functions, is thought to be shrinking in the Anthropocene. Here, we assessed the prevalence of body size change in six taxon groups across 5025 assemblage time series spanning 1960 to 202...

Biotic responses to global change include directional shifts in organismal traits. Body size, an integrative trait that determines demographic rates and ecosystem functions, is often thought to be shrinking in the Anthropocene. Here, we assess the prevalence of body size change in six taxon groups across 5,032 assemblage time-series spanning 1960-2...

Global ecosystems are facing a deepening biodiversity crisis, necessitating robust approaches to quantifying species extinction risk. The lower limit of the macroecological relationship between species range and body size has long been hypothesized as an estimate of the relationship between the minimum viable range size (MVRS) needed for species pe...

The process of standardizing taxon names, taxonomic name harmonization, is necessary to properly merge data indexed by taxon names. The large variety of taxonomic databases and related tools are often not well described. It is often unclear which databases are actively maintained or what is the original source of taxonomic information. In addition,...

The quantity and quality of ecological data have rapidly increased in the last decades, bringing ecology into the realm of big data. Frequently, multiple databases with different origins and data characteristics are combined to address new research questions. Taxonomic name harmonization, i.e., the process of standardizing taxon names according to...

1. The process of standardizing taxa names, taxonomic name harmonization, is necessary to properly merge data indexed by taxon names. The large variety of taxonomic databases and related tools are often not well described. It is often unclear which databases are actively maintained or what is the original source of taxonomic information. In additio...

Aim Geographical gradients of vertebrate species richness are determined jointly by evolutionary and environmental factors. Support for these factors comes mostly from tetrapods and, recently, marine fishes, but their validity and relative importance in freshwater fishes is not well understood. Here, we describe the species richness gradient for th...

Motivation: We compiled a global database of long-term riverine fish surveys from 46 regional and national monitoring programmes and from individual academic research efforts, with which numerous basic and applied questions in ecology and global change research can be explored. Such spatially and temporally extensive datasets have been lacking for...

Understanding the geographic distribution of species across space and time is one of the long-standing challenges in ecology and evolution. Among the major components of species distribution, the species' geographic range size has been studied across several taxonomic groups and has been related to multiple ecological and evolutionary factors. The...

Change in species' climatic niches is a key mechanism influencing species distribution patterns. The question of which factors impact niche change remains a highly debated topic in evolutionary biology. Previous studies have proposed that rates of climatic niche change might be correlated with climatic oscillations at high latitude or adaptation to...

Significance Species’ geographic range size is a fundamental aspect of understanding and predicting changes in biodiversity patterns. Investigating the global drivers of geographic range size variation in freshwater fishes, we found clear evidence that current and historical connectivity are, by far, the main determinants of range size. More specif...

El objetivo de este trabajo es mostrar las utilidades del programa informático ModestR, en estudios sobre distribución de especies en ecosistemas marinos y de agua dulce de Colombia. Este programa se encuentra disponible en la Web de manera gratuita: <http://www.ipez.es/ModestR>. Para enseñar y probar el funcionamiento de ModestR se trabajó con los...

Some species of marine fish have complex relationships with coastal ecosystems during their reproductive periods, as the needle fish Tylosurus pacificus that forms spawning aggregations in gravel beaches in Utría Park. We described fishery and some aspects of the reproductive biology of T. pacificus and proposed some strategies to mitigate the impa...

Tropical rivers are experiencing an unprecedented boom in dam construction. Despite rapid dam expansion, knowledge about the ecology of tropical rivers and the implications of existing and planned dams on freshwater-dependent species remains limited. Here we evaluate fragmentation of fish species ranges, considering current and planned dams of the...

The climbing behavior in a suckermouth Loricariidae catfish species is reported for the first time. A group of eight specimens of Cordylancistrus sp. were observed in situ climbing a waterfall in a mountain stream of the Colombian Andes. This study describes how this species overcame the vertical barrier, and then discusses and hypothesizes how the...

Studies on elevation diversity gradients have covered a large number of taxa and regions throughout the world; however, studies of freshwater fish are scarce and restricted to examining their changes along a specific gradient. These studies have reported a monotonic decrease in species richness with increasing elevation, but ignore the high taxonom...

La serranía del Baudó es un centro reconocido de biodiversidad terrestre y acuática y de origen de especies ícticas para Mesoamérica. Sin embargo, es poco lo que se conoce sobre los patrones locales y regionales de la diversidad de su ictiofauna, producto de la escasa exploración científica. De acuerdo con la información disponible se establece que...

Gorgona, Baudó and Darién (Biogeographic Chocó, Colombia): model ecoregions for coastal stream ecology studies. This paper summarizes the available information on the geology, hydrology, and biota of coastal streams located in the Gorgona National Natural Park (GNNP), and the Baudó and Darién ecoregions within the Biogeographic Chocó (Colombia). De...

This study reports length–weight relationships for 38 fish species belonging to 18 families inhabiting the Magdalena River floodplain lakes of Colombia. Samples were taken during the high water season of 2008, 2010 and 2011. Two species are presented for the first time. Maximum total length records for 24 species exceed those in FishBase.

The aim of this manuscript is to show the usefulness of the software package ModestR in studies of distribution of Colombian marine and freshwater species. This software is free available at the Website: <http://www.ipez.es/ ModestR>. To show and test the potential of ModestR, here an exemplar assessment is presented of a database using all valid s...

Los lagos someros presentes en los planos de inundación de sistemas fluviales tropicales son considerados como ambientes que ofrecen alimento y protección a los peces, en especial en las etapas de desarrollo inicial en la ontogenia de los individuos. Debido a la fuerte influencia que tiene el pulso de inundación sobre estos ambientes, algunos momen...

We investigated if fish assemblages in neotropical floodplain lakes (cienagas) exhibit nestedness, and thus offer support to the managers of natural resources of the area for their decision making. The location was floodplain lakes of the middle section of the Magdalena river, Colombia. We applied the nested subset analysis for the series of 30 cie...

A number of studies have pointed out that abiotic factors and recolonization dynamics appear to be more important than biotic interactions in structuring river–fish assemblages. In this paper, we studied the fish assemblages in 27 floodplain lakes, with perennial connection to the river, in the middle section of the Magdalena River (Colombia), to e...

Uso tradicional de los recursos naturales pesqueros y conservación de la biodiversidad en regiones tropicales en desarrollo: hacia un modelo de Ecología de la Reconciliación (Informe Final) Financiado por: Con el apoyo de: Abril de 2012 2 Uso tradicional de los recursos naturales pesqueros y conservación de la biodiversidad en regiones tropicales e...

Shallow lakes of tropical fluvial floodplain systems are suitable habitats that provide food and shelter for fish, especially during periods of early development stages. Due to the strong influence of the flood pulse on these environments, there are critical periods (i.e., severe drought) to the fish fauna. By analysing the food and shelter supply...