Andrea C. Encalada
A5047272274- Fish Ecology and Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Fish biology, ecology, and behavior
- Aquatic Invertebrate Ecology and Behavior
- Species Distribution and Climate Change
- Hydrology and Watershed Management Studies
- Fish Biology and Ecology Studies
- Hydrology and Sediment Transport Processes
- Ecology and Vegetation Dynamics Studies
- Environmental and Cultural Studies in Latin America and Beyond
- Soil and Water Nutrient Dynamics
- Lepidoptera: Biology and Taxonomy
- Plant and animal studies
- Isotope Analysis in Ecology
- Atmospheric and Environmental Gas Dynamics
- Conservation, Biodiversity, and Resource Management
- Marine and coastal ecosystems
- Genetic diversity and population structure
- Physiological and biochemical adaptations
- Identification and Quantification in Food
- Forest Ecology and Biodiversity Studies
- Environmental law and policy
- Land Use and Ecosystem Services
- Heavy metals in environment
- Cryospheric studies and observations
Universidad San Francisco de Quito
2016-2025
University of North Carolina at Chapel Hill
2019
University of Coimbra
2009-2019
Institute of Marine Research
2009-2019
Cornell University
2004-2011
Rocky Mountain Biological Laboratory
2004-2008
Pontificia Universidad Católica del Ecuador
1997
Hydropower development in the Andean Amazon has been underestimated and will disrupt connected human natural systems.
Species richness is greatest in the tropics, and much of this diversity concentrated mountains. Janzen proposed that reduced seasonal temperature variation selects for narrower thermal tolerances limited dispersal along tropical elevation gradients [Janzen DH (1967) Am Nat 101:233-249]. These locally adapted traits should, turn, promote reproductive isolation higher speciation rates mountains compared with temperate ones. Here, we show montane stream insects have diverged tolerance capacity,...
Plant litter breakdown is a key ecological process in terrestrial and freshwater ecosystems. Streams rivers, particular, contribute substantially to global carbon fluxes. However, there little information available on the relative roles of different drivers plant fresh waters, particularly at large scales. We present global-scale study streams compare biotic, climatic other environmental factors rates. conducted an experiment 24 encompassing latitudes from 47.8° N 42.8° S, using mixtures...
The detrital‐based food web of many streams and rivers plays a fundamental role in the cycling retention carbon nutrients. However, we still need to understand which global mechanisms underlie biogeochemical pathways that control energy transfer from detrital pool through local webs into nutrient cycles storage. Previous attempts variability litter breakdown rates have included search for latitudinal variation patterns analysis influence different factors. Here complement those studies by...
An experiment in >1000 river and riparian sites found spatial patterns controls of carbon processing at the global scale.
Abstract The hypotheses that beta diversity should increase with decreasing latitude and spatial extent of a region have rarely been tested based on comparative analysis multiple datasets, no such study has focused stream insects. We first assessed how well variability in insect metacommunities is predicted by group, latitude, extent, altitudinal range, dataset properties across drainage basins throughout the world. Second, we relative roles environmental factors driving variation assemblage...
Proposed hydropower dams at more than 350 sites throughout the Amazon require strategic evaluation of trade-offs between numerous ecosystem services provided by Earth's largest and most biodiverse river basin. These are spatially variable, hence collective impacts newly built depend strongly on their configuration. We use multiobjective optimization to identify portfolios that simultaneously minimize flow, connectivity, sediment transport, fish diversity, greenhouse gas emissions while...
1. Structure and diversity of the macroinvertebrate fauna were studied in relation to altitude latitude among three groups streams from Ecuador (lowland: 100–600 m, Central Valley: 2600–3100 páramo: 3500–4000 m), one group temperate lowland region Denmark. The four regions comparable with regard physical characteristics such as size, current substratum. 2. In terms faunal composition Ecuadorian highland bore more resemblance Danish than streams. greater similarity between streams, however,...
Most hypotheses explaining the general gradient of higher diversity toward equator are implicit or explicit about greater species packing in tropics. However, global patterns within guilds, including trophic guilds (i.e., groups organisms that use similar food resources), poorly known. We explored a key guild stream ecosystems, detritivore shredders. This was motivated by fundamental ecological role shredders as decomposers leaf litter and some records pointing to low shredder abundance...
ABSTRACT Aim We tested the hypothesis that shredder detritivores, a key trophic guild in stream ecosystems, are more diverse at higher latitudes, which has important ecological implications face of potential biodiversity losses expected as result climate change. also explored dependence local diversity on regional species pool across and examined influence environmental factors diversity. Location World‐wide (156 sites from 17 regions located all inhabited continents latitudes ranging 67° N...
Detrital food webs of woodland streams depend on terrestrial litter input and, thus, are susceptible to changes in riparian cover. We assessed effects species richness and quality decomposition associated biological communities temperate deciduous forest tropical rainforest streams. Three native were incubated each stream all combinations (7 treatments, 3 levels) coarse- (invertebrate access) fine-mesh bags (no invertebrate sampled 5 times over 74 (temperate stream) or 94 d (tropical...
Abstract Janzen's extension of the climate variability hypothesis (CVH) posits that increased seasonal variation at high latitudes should result in greater temperature overlap across elevations, and favour wider thermal breadths temperate organisms compared to their tropical counterparts. We tested these predictions by measuring stream temperatures (i.e. difference between critical maximum minimum) 62 aquatic insect species from (Colorado, USA ) (Papallacta, Ecuador) streams spanning an...
Philogenia gaiae sp. nov. (Holotype ♂, Ecuador, Orellana, Tiputini Biodiversity Station, -0.6349, -76.1501, 241 m, 13 xii 2012, A. Cordero-Rivera & M. Sánchez-Herrera leg., in MUAE) from the helena group is described, illustrated, diagnosed and compared with morphologically close species of genus. can be distinguished its most similar congener P. minteri Dunkle, 1986 by enlarged cerci club-like paraprocts. We also describe female macuma 1986, a pair collected at Jatún Sacha Biological...
The ‘mountain passes are higher in the tropics’ (MPHT) hypothesis posits that reduced climate variability at low latitudes should select for narrower thermal tolerances, lower dispersal and smaller elevational ranges compared with latitudes. These latitudinal differences could increase species richness latitudes, but may be largely cryptic, because physiological traits isolating populations might not correspond to morphological differences. Yet previous tests of MPHT have addressed cryptic...
Abstract The relationship between detritivore diversity and decomposition can provide information on how biogeochemical cycles are affected by ongoing rates of extinction, but such evidence has come mostly from local studies microcosm experiments. We conducted a globally distributed experiment (38 streams across 23 countries in 6 continents) using standardised methods to test the hypothesis that enhances litter streams, establish role other characteristics assemblages (abundance, biomass...
Running waters contribute substantially to global carbon fluxes through decomposition of terrestrial plant litter by aquatic microorganisms and detritivores. Diversity this may influence instream globally in ways that are not yet understood. We investigated latitudinal differences mixtures low high functional diversity 40 streams on 6 continents spanning 113° latitude. Despite important variability our dataset, we found the effect decomposition, which explained as evolutionary adaptations...
Summary 1. Although stream–catchment interactions have been analysed in some detail temperate environments, little is known about the effects of land‐use changes tropics. Here, we analyse differences benthic communities (macroinvertebrates and fungi) under two contrasting land uses (mature secondary forest pasture) montane streams north‐western Ecuador their influence on rates litter processing. 2. Between 2005 2006, used a combination coarse fine mesh bags to study relative contribution...
Many forested headwater streams are heterotrophic ecosystems in which allochthonous inputs of plant litter a major source energy. Leaves riparian vegetation entering the stream broken down by combination biotic and abiotic processes and, most temperate boreal streams, provide food habitat for dense populations detritivorous invertebrates. However, tropical different parts world show substantial variability number diversity leaf-shredding detritivores (hereafter detritivores). We used data...
Plant litter represents a major basal resource in streams, where its decomposition is partly regulated by traits. Litter-trait variation may determine the latitudinal gradient which mainly microbial tropics and detritivore-mediated at high latitudes. However, this hypothesis remains untested, as we lack information on large-scale trait for riparian litter. Variation cannot easily be inferred from existing leaf-trait databases, since nutrient resorption can cause traits of green leaves to...
Non-native fish (NNF) can threaten megadiverse aquatic ecosystems throughout the planet, but limited information is available for Amazon Region. In this study we review NNF data in Amazonian macroregion using spatiotemporal records on occurrence and richness of from a collaborative network 35 regional experts, establishing database (ANNF). The species was analyzed by river basin country, as well policies each geopolitical division Amazon. analysis included six countries (Brazil, Peru,...
Rivers and streams contribute to global carbon cycling by decomposing immense quantities of terrestrial plant matter. However, decomposition rates are highly variable large-scale patterns drivers this process remain poorly understood. Using a cellulose-based assay reflect the primary constituent detritus, we generated predictive model (81% variance explained) for cellulose across 514 globally distributed streams. A large number variables were important predicting decomposition, highlighting...
The community structure and functional feeding groups of the macroinvertebrate fauna were examined in eight Ecuadorian highland streams wet dry season. abiotic environment was highly unstable with great variability discharge during season, but relatively constant short Overall, number individuals species significantly higher season than In all composition differed markedly between two seasons, no consistent change proportions found for streams. both seasons Baetidae, Simuliidae, Chironomidae...