Juan David González-Trujillo

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Verified

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• PhD
• Professor (Assistant) at National University of Colombia

Deforestation is a major driver of biodiversity loss in the Tropical region, but the role of upstream refugia and dispersal ability on the community response to this disturbance is unknown. We assessed the relevance of undisturbed upstream patches (“refugia”) on the responses of benthic communities to forest cover loss. We selected four Andean rive...

Aim: Contemporary dispersal constraints and environmental conditions are broadly recognized as significant drivers of beta diversity patterns. However, beta diversity patterns may also reflect the legacy of past climatic and geological events. In this study, we investigated the relative importance of historical and contemporary factors as drivers o...

Both gradual and extreme weather changes trigger complex ecological responses in river ecosystems. It is still unclear to what extent trend or event effects alter biodiversity and functioning in river ecosystems, adding considerable uncertainty to predictions of their future dynamics. Using a comprehensive database of 71 published studies, we show...

Climate change is a multidimensional phenomenon. As such, no single metric can capture all trajectories of change and associated impacts. While numerous metrics exist to measure climate change, they tend to focus on central tendencies and neglect the multidimen-sionality of extreme weather events (EWEs). EWEs differ in their frequency, duration, an...

Central America and the Caribbean are regularly battered by megadroughts, heavy rainfall, heat waves, and tropical cyclones. Although 21st‐century climate change is expected to increase the frequency, intensity, and duration of these extreme weather events (EWEs), their incidence in regional protected areas (PAs) remains poorly explored. We examine...

The Guiana Shield contains multiple freshwater ecosystems that support high species diversity. This ecoregion represents a stable landscape resulting from infrequent large-scale natural disturbances (i.e., Andean orogeny, marine incursions), favoring biological adaptations and endemisms (e.g., loricariids). However, disturbing human activities in n...

Biogeographic regions arise due to constraints on species ranges, fostering lineage divergence as a result. Yet, convergent evolution means that evolutionary distinct lineages can share similar characteristics when subjected to similar environmental conditions. The ecological convergence of distinct regions has been demonstrated in terrestrial comm...

The Andean-Amazon region harbors exceptional biodiversity; however, aquatic diversity in its transitional zones remains understudied. Here, we evaluated the alpha and beta diversities of mayflies across the Andean-Amazonian transition in Caquetá, Colombia, to assess how environmental gradients influence their distribution. We sampled mayflies and c...

Biotic interactions are a critical element for the functioning and the stability of ecosystems, yet anthropogenic pressures can significantly disrupt these networks of interacting species. While species-focused conservation is central to most conservation policy, it is also vital to identify the interactions at risk and the ones that play a disprop...

Motivation: Freshwater ecosystems have been heavily impacted by land-use changes, but data syntheses on these impacts are still limited. Here, we compiled a global database encompassing 241 studies with species abundance data (from multiple biological groups and geographic locations) across sites with different land-use categories. This compilation...

Scientific communities need to understand and eliminate barriers that prevent scientists from reaching their full potential. However, the combined impact of individuals’ linguistic, economic, and gender backgrounds on their scientific productivity is poorly understood. Using a survey of 908 environmental scientists, we show that being a woman is as...

Motivation: Freshwater ecosystems have been heavily impacted by land-use changes, but data syntheses on these impacts are still limited. Here, we compiled a global database encompassing 241 studies with species abundance data (from multiplebiological groups and geographic locations) across sites with different land-use categories. This compilation...

Motivation: Freshwater ecosystems have been heavily impacted by land-use changes, but syntheses on the impacts on freshwater ecosystems are still limited. Here, we compiled a global database encompassing 248 studies with species abundance data (from multiple taxon groups and geographic locations) across sites with different land-use categories. Thi...

Motivation: Freshwater ecosystems have been heavily impacted by land-use changes, but syntheses on the impacts on freshwater ecosystems are still limited. Here, we compiled a global database encompassing 248 studies with species abundance data (from multiple taxon groups and geographic locations) across sites with different land-use categories. Thi...

More than half of the world’s rivers experience occasional, seasonal, or permanent drying, and this may increase because of climate change. Drying, i.e. severe reduction in water flow even leading to streambed desiccation, can have a profound impact on the available aquatic habitat, biodiversity, and functions of rivers. Yet, to date, it is unclear...

Bacterial communities in river sediments are shaped by a trade-off between dispersal from upstream or nearby land and selection by the local environmental conditions. In temporary rivers (i.e. those characterized by long drying periods and subsequent rewetting) seasonal hydrological dynamics shape bacterial communities by connecting or disconnectin...

Aim: Climate change poses a challenge to the Azores' biodiversity, with consequences that remain unexplored. To shed light on the potential impacts of climate change, we have developed a large ensemble of species distribution models (SDMs) for species found in the coastal marine environments and examined their spatiotemporal turnover and stability....

A better understanding of the extent to which coastal species passively disperse and establish connections across seascapes is instrumental for marine conservation and management, as well as biogeography and climate change research. This understanding is particularly relevant for projecting the dynamics of species' geographical ranges. However, a c...

A better understanding of the extent to which coastal species passively disperse and establish connections across seascapes is instrumental for marine conservation and management, as well as biogeography and climate change research. This understanding is particularly relevant for projecting the dynamics of species' geographical ranges. However, a c...

Context Global change, including land-use change and habitat degradation, has led to a decline in biodiversity, more so in freshwater than in terrestrial ecosystems. However, the research on freshwaters lags behind terrestrial and marine studies, highlighting the need for innovative approaches to comprehend freshwater biodiversity. Objectives We i...

Studying past community dynamics can provide valuable insights for anticipating future changes in the world's biota. However, the existing fossil record is too sparse to enable continuous temporal reconstructions of wholesale community dynamics. In this study, we utilise machine learning to reconstruct Late Quaternary community structure, leveragin...

Although scientific research has identified the causes of undesirable ecological changes in fresh waters, translating the results of research into practical conservation and management, and raising awareness of the need for action, is often inadequate. This Viewpoint considers the present coverage of conservation‐related freshwater research, the ap...

The use of English as the common language of science represents a major impediment to maximising the contribution of non-native English speakers to science. Yet few studies have quantified the consequences of language barriers on the career development of researchers who are non-native English speakers. By surveying 908 researchers in environmental...

Objetivo: Describir la diversidad taxonómica y distribución altitudinal de los géneros de la familia Chironomidae en la cuenca del río Gaira (Sierra Nevada de Santa Marta). Metodología: Se realizaron 8 muestreos en tres sitios a lo largo de un gradiente altitudinal (60, 900 y 1700 m) entre el 2018 y 2019, cubriendo los periodos secos y lluviosos....

The North Atlantic Basin (NAB) has seen an increase in the frequency and intensity of tropical cyclones since the 1980s, with record-breaking seasons in 2017 and 2020. However, little is known about how coastal ecosystems, particularly mangroves in the Gulf of Mexico and the Caribbean, respond to these new "climate normals" at regional and subregio...

Catchment urbanisation results in urban streams being exposed to a multitude of stressors. Notably, stressors originating from diffuse sources have received less attention than stressors originating from point sources. Here, advances related to diffuse urban stressors and their consequences for stream benthic communities are summarised by reviewing...

Este trabajo presenta una caracterización de los grupos tróficos de las comunidades de invertebrados que habitan en tres quebradas y caños de las llanuras aluviales de la Orinoquía colombiana. Los muestreos de las comunidades se realizaron en tres arroyos durante los meses de julio de 2016, octubre de 2016 y enero de 2017). En tramos de 50 m se mid...

Some case studies that evidence changes in the composition of aquatic macroinvertebrates along the altitudinal gradients of Colombian rivers are analyzed. Most of the works on ecology and distribution of this biological group have been developed in the Andean zone (center and west of Colombia) and the Sierra Nevada de Santa Marta (north of Colombia...

Comprender las percepciones acerca de los ecosistemas que nos rodean es un paso fundamental en el desarrollo de planes de gestión y conservación. Hoy en día, herramientas de la culturómica, como el análisis de sentimientos, representan una gran oportunidad para la caracterización y evaluación de las percepciones de las personas. No obstante, existe...

Fire is a natural agent with a paramount role in ecosystem functioning and biodiversity maintenance. Still, it can also act as a negative force against many ecosystems. Despite some knowledge of the interactions of fire and vegetation, there is no clear understanding of how different components of fire regimes (i.e., severity, history, or frequency...

The North Atlantic Basin (NAB) is seeing a significant increase in the frequency and intensity of tropical cyclones since the 1980s, with record-breaking seasons such as 2017 and 2020. However, little is known about how coastal ecosystems, particularly mangroves in the Gulf of Mexico and the Caribbean, are responding to these new climate normals at...

Land use policies and planning in Latin America have been partially successful in halting deforestation yet have not stopped forest degradation. Here, we study the different stakeholders' perspectives of the drivers of forest degradation. We use Colombia as a case study for understanding synergies and trade-offs of the sustainable development goals...

The use of English as the common language of science represents a major impediment to maximising the contribution of non-native English speakers to science. Yet few studies have quantified the consequences of language barriers on the career development of researchers who are non-native English speakers. Our survey demonstrates that non-native Engli...

Cities and towns can be conceptualized as invasion hotspots. The connections created by roads or highways facilitate the mobility of these species, expanding their range of distribution and contributing to their expansion through the landscape to other urban areas or nearby natural and semi-natural ecosystems. Here we describe the actual distributi...

Fire is a global disturbance that has a strong influence on biodiversity. Seasonal fires are common in neotropical savannas of South America, yet few studies have analyzed how the fauna of these habitats and nearby forests respond to fire. We evaluated the effects of fire on the community of non-volant small mammals in the Colombian llanos by compa...

Several studies have revealed that beta-diversity patterns are tightly coupled to differences in habitat heterogeneity and the spatial distance among headwaters. However, addressing the relative role of these factors over time is yet to be done, particularly in those factors acting at the local scale. Here, we investigated the temporal responses of...

Chemical stressors co-occur in mixtures into watercourses and this complicates predicting their effects on their ecological status. Our knowledge of river basin specific pollutants (RBSPs) is still limited, but it remains necessary to ensure the good chemical and ecological status. We performed an exercise on Mediterranean river sites exposed to ur...

Auto-ecological responses of rainbow trout populations to ecoregional differences in a neotropical Andean river We assessed changes in auto-ecological traits of Rainbow Trout (Oncorhynchus mykiss) in a river flowing through two ecoregional belts. Besides the temperature and elevation, these ecoregional belts mainly differed in terms of the presence...

We assessed the relative influence of ecoregional features in explaining diatom distribution in the Orinoco river basin. Ecoregions in the Colombian Orinoco can be seen as imprints of the evolutionary history of the basin, for their current biodiversity and physiographic features are the result of the geological and climatic shifts that have occurr...

Water flow velocity is a strong environmental filter structuring benthic communities in lotic ecosystems. While many studies have determined its effect on the distribution and diversity patterns of insects, the role of water flow velocity on other groups of aquatic invertebrates (i.e., Oligochaeta) has remained unexplored. We sampled five lotic eco...

ntroduction Spatial and seasonal characterization of the macroinvertebrate communities of Colombian Guiana (Serranía La Lindosa, San José De Guaviare, Colombia) Describing biodiversity patterns and the underlying drivers is relevant for tackling the rampant pressures on tropical freshwaters. This is particularly relevant in scarcely studied regions...

Aim. To identify and characterize the distribution of invertebrate taxa in the Orinoco basin and how their distribution affects the metacommunity structure along the river network. Location. Meta and Guaviare sub‐basins, Orinoco basin, Colombia, South America. Methods. We characterized the invertebrate communities and environmental characterist...

La relación longitud-peso y el factor de condición (K) son utilizados como descriptores de los aspectos auto-ecológicos de los peces, porque aportan información sobre el crecimiento, reproducción y bienestar. Por tanto, su caracterización podría ser de gran utilidad en la evaluación de poblaciones de peces en sistemas acuáticos afectados por difere...

Urban wastewater inputs are a relevant pollution source to rivers, contributing a complex mixture of nutrients, organic matter and organic microcontaminants to these systems. Depending on their composition, WWTP effluents might perform either as enhancers (subsidizers) or inhibitors (stressors) of biological activities. In this study, we evaluated...

Few studies have explored the ecology and interrelationship with other organisms of the many endangered freshwater turtle species inhabiting the Neotropical region. The focus of the current study was to shed light on the relationship between Neotropical turtle carapaces and primary producers, insofar as the surface of former constitutes a suitable...

Flow regulation can alter the structure and dynamics of lotic communities, especially in rivers with unpredictable high-flow events, such as those flowing through the Páramo, an endemic ecosystem of the high-altitude Neotropical Andes. This study evaluated how flow regulation affects invertebrate assemblage structure in a Pa ́ ramo river. In both t...

The importance of channel complexity in maintaining biological integrity and ecosystem functioning has been addressed by several researchers. In spite of this, High-Andean streams are being channelized without regard to the effect that channelization might have on stream communities. To attempt to determine these effects, the present study evaluate...

In Colombia, most of the towns and cities have a high flooding-risk because they are located on river floodplains. Due to the lack of models or methods to establish flood affected areas, we propose a methodology that links GIS with remote sensing to identify flooding-affected areas. We used the Model Builder tool available in ArcMap 10.2 for conduc...

Abstract: Key to chironomid pupal exuviae (Diptera: Chironomidae) of tropical high Andean streams. The Chironomidae is a cosmopolitan family of Nematoceran flies with more than 20 000 species described. However the diversity of genera and species of the family in the Andean region beyond the 2 000m.a.s.l are scarcely known. We conducted faunal surv...

Key to chironomid pupal exuviae (Diptera: Chironomidae) of tropical high Andean streams. The Chironomidae is a cosmopolitan family of Nematoceran flies with more than 20 000 species described. However the diversity of genera and species of the family in the Andean region beyond the 2 000m.a.s.l are scarcely known. We conducted faunal surveys and bi...