Daniel Ayllón

Daniel Ayllón
Complutense University of Madrid | UCM · Biodiversity Ecology and Evolution

PhD in Conservation Biology

About

48
Publications
12,565
Reads
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1,414
Citations
Citations since 2017
31 Research Items
1079 Citations
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2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300
Additional affiliations
August 2020 - May 2021
University of Castilla-La Mancha
Position
  • PostDoc Position
April 2017 - June 2020
Complutense University of Madrid
Position
  • PostDoc Position
June 2016 - October 2016
Helmholtz Centre for Environmental Research - UFZ
Position
  • PostDoc Position
Education
November 2006 - March 2008
October 2003 - October 2006
Technical University of Madrid
Field of study
October 1996 - May 2003
Technical University of Madrid
Field of study

Publications

Publications (48)
Article
Streamflow is a main driver of fish population dynamics and is projected to decrease in much of the northern hemisphere, especially in the Mediterranean region, due to climate change. However, predictions of future climate effects on cold-water freshwater fish populations have typically focused only on the ecological consequences of increasing temp...
Article
The acceptance and usefulness of simulation models are often limited by the efficiency, transparency, repro-ducibility, and reliability of the modelling process. We address these issues by suggesting that modellers (1) "trace" the iterative modelling process by keeping a modelling notebook corresponding to the laboratory notebooks used by empirical...
Article
Climate change is impacting the composition and functioning of virtually every ecosystem on Earth, and disrupting the productivity of exploited ones. Species are rapidly adjusting to their changing environments through evolutionary and/or plastic phenotypic changes in behavioural, physiological, phenological and life‐history traits. Size‐selective...
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The Overview, Design concepts and Details (ODD) protocol for describing Individual- and Agent-Based Models (ABMs) is now widely accepted and used to document such models in journal articles. As a standard- ized document for providing a consistent, logical and readable account of the structure and dynamics of ABMs, some research groups also find it...
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The Southern Iberian spined-loach Cobitis paludica is an Iberian endemism threatened by human activities, including habitat destruction. For this reason, the development of conservation and the recovery plans for the species calls for a precise knowledge of its habitat requirements. Here, microhabitat use and selection patterns were investigated to...
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Males and females are often subject to different and even opposing selection pressures. When a given trait has a shared genetic basis between the sexes, sexual conflict (antagonism) can arise. This can result in significant individual‐level fitness consequences that might also affect population performance, whilst anthropogenic environmental change...
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Protected areas (PAs) are fundamental for global biodiversity conservation but many are not delivering their conservation potential. In particular, the European Natura 2000 (N2K)–the largest coordinated network of PAs in the world—has insofar proved insufficient to achieve the EU’s biodiversity conservation targets. Despite the adoption of innovati...
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Aim Invasive alien species (IAS) can cause profound impacts on ecosystem function and diversity, human health, well-being and livelihoods. Climate change is an important driver of biological invasions, so it is critical to develop models and climate-driven scenarios of IAS range shifts to establish preventive measures. In this study, we analyse how...
Article
Mechanistic, individual-based simulation models have been used for >25 years to overcome well-known limitations of “habitat suitability” models. InSTREAM 7 is the latest of our individual-based models for predicting the effects of flow and temperature regimes on stream salmonid populations. Unlike PHABSIM (or other methods based on habitat “quality...
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The freshwater blenny Salaria fluviatilis is an endangered fish species with populations that are in rapid decline, largely owing to habitat degradation caused by human activity. This situation highlights the urgent need to develop measures for the conservation and recovery of the species based on a deep understanding of its specific habitat requir...
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The European Commission has recently adopted its EU Biodiversity Strategy for 2030, which sets out an ambitious plan for reversing biodiversity loss, and preserving and restoring protected ecosystems. A central binding target is focused on enlarging the EU network of legally protected areas (Natura 2000, the largest global network of the world), an...
Article
The European Natura 2000 (N2000) is the largest network of protected areas in the world. It was established to protect Europe’s most valuable and threatened species and habitats. While introduction pathways of invasive alien species (IAS) are strongly linked to human activities, they are not prohibited within N2000 sites, which makes them highly vu...
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Large‐scale abortion of immature fruits is a pervasive phenomenon across seed plants due to maternal physiological decisions associated with matching resources with fruit crop size. Aborted fruits are usually disqualified from studies of both fruit production and seed dispersal. However, a considerable number of developing seeds occur within immatu...
Article
Salmonids adaptively select when in the daily light cycle to feed, and use different habitat at different times of day; yet the data and methods used to evaluate management actions like instream flows and restoration projects typically consider daytime only. Our new model, inSTREAM 7, lets us investigate how management decisions might change if we...
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Many animals make contingent decisions, such as when and where to feed, as trade-offs between growth and risk when these vary not only with activity and location but also 1) in cycles such as the daily light cycle and 2) with feedbacks due to competition. Theory can assume an individual decides whether and where to feed, at any point in the light c...
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Contemporary defaunation has profound ecological consequences ranging from local or even global co-extinctions of interacting species to the loss of ecosystem functions and services critical for humanity. Other components of global change (climate change, introduced pests, land use changes) are also harming ecosystem functioning by augmenting tree...
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Historical data on the oceanic distribution and migration routes of southernmost Atlantic salmon Salmo salar populations from Europe are almost non-existent, as no rigorous tagging initiatives have been conducted. Here, we used stable isotope data (δ13C and δ15N) of historic scale collections to identify the potential marine feeding areas of the la...
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The consistency of the global declining trend of Atlantic salmon Salmo salar populations suggests that climate-driven reduced survival and growth at sea are the main driving factors. The southernmost populations have experienced the greatest declines, consistent with harsher conditions in natal freshwaters. We analyzed temporal trends in Spanish At...
Article
Few studies have assessed the impact of dams on the distribution of the genetic diversity of Neotropical fish species, and some of them suggest that the genetic structure of fish metapopulations is not affected by damming. However, the effects of dams on the genetic structure of populations may hinge on the biological characteristics of the species...
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Harvesting alters demography and life histories of exploited populations, and there is mounting evidence that rapid phenotypic changes at the individual level can occur when harvest is intensive. Therefore, recreational fishing is expected to induce both ecological and rapid evolutionary changes in fish populations and consequently requires rigorou...
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The abundance of Atlantic salmon is declining throughout its geographical area. Fisheries and global warming were assumed as main drivers of the decline, and recent studies suggest that habitat changes in freshwater is a third contributor. Southern populations experience the greatest decline, and face the highest risk of extinction as global warmin...
Article
Movement is a fundamental element of animal behaviour, and it is the primary way through which animals respond to environmental changes. Therefore, understanding the drivers of individual movement is essential for species conservation. The endangered Saimaa ringed seal (Phoca hispida saimensis) lives land-locked in Lake Saimaa and is affected by va...
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Terrestrial environmental systems are characterised by numerous feedback links between their different compartments. However, scientific research is organized into disciplines that focus on processes within the respective compartments rather than on interdisciplinary links. Major feedback mechanisms between compartments might therefore have been sy...
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Increasing land abandonment in many areas of the world presents an opportunity for ecosystem recovery, which is often driven by seed dispersal by vertebrate frugivores. However we are far from understanding the most effective way of using common management actions (i.e. planting fruiting trees) to stimulate animal seed dispersal and thus the restor...
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Ecosystem and community ecology have evolved along different pathways, with little overlap. However, to meet societal demands for predicting changes in ecosystem services, the functional and structural view dominating these two branches of ecology, respectively, must be integrated. Biodiversity–ecosystem function research has addressed this integra...
Article
We present a modeling approach to assess the impact of different conservation management options on the population dynamics of the moor frog (Rana arvalis, Amphibia, Anura) in dynamic river floodplains. The model is targeted at supporting amphibian conservation actions within floodplain management efforts for human flood protection. FloMan-MF is an...
Article
NetLogo has become a standard platform for agent-based simulation, yet there appears to be widespread belief that it is not suitable for large and complex models due to slow execution. Our experience does not support that belief. NetLogo programs often do run very slowly when written to minimize code length and maximize clarity, but relatively simp...
Article
Current rates of environmental change are exceeding the capacity of many populations to adapt to new conditions and thus avoid demographic collapse and ultimate extinction. In particular, cold-water freshwater fish species are predicted to experience strong selective pressure from climate change and a wide range of interacting anthropogenic stresso...
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Foraging decisions and their energetic consequences are critical to capital Arctic-breeders migrating in steps, because there is only a narrow time window with optimal foraging conditions at each step. Optimal foraging theory predicts that such animals should spend more time in patches that enable them to maximise the net rate of energy and nutrien...
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Territoriality is probably the most important ecological mechanism regulating densities in stream-living salmonids. Body size is typically regarded as the best predictor of territory size, but food abundance and competitor density may be key driving factors. However, a global analysis of literature data showed no clear patterns on the relative caus...
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Understanding the links between instream ecology and hydrology has become a critical task in contemporary river research and management. Habitat selection behaviour is a central dimension in applied ecology because it is a primary way that mobile organisms adapt to changing environmental conditions. Here, we analyzed brown trout habitat selection d...
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Anthropogenic environmental change is causing unprecedented rates of population extirpation and altering the setting of range limits for many species. Significant population declines may occur however before any reduction in range is observed. Determining and modelling the factors driving population size and trends is consequently critical to predi...
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The Physical Habitat Simulation System (PHABSIM) still probably remains as the most widespread habitat method used to establish inflow standards or to link habitat temporal variations with fish population dynamics. However, statistical uncertainties around the PHABSIM main output, the weighted usable area (WUA) over discharge curves, are usually ig...
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Current climate change exacerbates the environmental restrictions on temperate species inhabiting low latitude edges of their geographical ranges. We examined how temperature variations due to current and future climate change are likely to affect populations persistence of stream-dwelling brown trout Salmo trutta at the vulnerable southern periphe...
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This study looks at the relative influence of water temperature and density dependence on the spatial variation in body size of 126 brown trout (Salmo trutta) cohorts from 12 Iberian rivers over a 12-year period. Mean cohort mass and length of age groups 0+ to 2+ varied significantly among sampling sites because of the concurrent effect of water te...
Article
1. Density-dependent growth has been widely reported in freshwater fishes, but the ontogenetic evolution of competition and its subsequent effects on growth through a life span remains unclear. 2. Patterns of competition can be described by integrating population abundance data with habitat-modelling results. Weighted usable area (WUA; m2 WUA ha−1)...
Article
Territorial behaviour is often considered the main mechanism regulating salmonid populations and territory size regarded as the proximate factor that limits abundance, being mainly determined by body size. Despite the spatial requirements of young-of-the-year (YOY) brown trout, Salmo trutta, have been previously established, there is still a gap in...
Article
Ayllón D, Almodóvar A, Nicola GG, Elvira B. Ontogenetic and spatial variations in brown trout habitat selection. Ecology of Freshwater Fish 2010: 19: 420–432. © 2010 John Wiley & Sons A/S Abstract – Habitat quality and quantity determine many biological processes and traits that directly affect the population dynamics of stream fishes. Understandin...
Article
Habitat modelling results are extremely sensitive to the habitat suitability criteria (HSC) used in the simulations. HSCs are usually expressed as univariate habitat suitability curves, although such univariate approach has been long questioned, since overlooking interactions between hydraulic variables may misrepresent the complexity of fish behav...
Book
Full-text available
La capacidad de carga de un río se define como la mayor abundancia de peces, ya sea en términos de densidad o biomasa, que dicho río puede soportar en condiciones naturales durante el periodo de menor hábitat disponible. La capacidad de carga permite, en consecuencia, conocer la abundancia potencial que pueden albergar los sistemas fluviales y, por...
Book
Full-text available
Hoy en día es incuestionable la importancia, cada vez mayor, de las áreas verdes urbanas como vehículo de escape y para hacer más amigable la ruda y cruda ciudad, y como centros de actuación y desarrollo de las inquietudes ciudadanas en muy diversos campos (deportivo, educativo, cultural, recreativo, ambiental y turístico). Pero así mismo, es indis...

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Projects

Projects (2)
Project
The general objective of this project, funded by the Spanish Ministry of Science, Innovation, and Universities (ref. PGC2018-094808-B-I00), is to quantify the joint effects of defaunation, overabundance of game species (i.e., “overfaunation”), and the introduction of invasive pests on the dynamics of several Mediterranean plant populations. Specifically, we will: 1. Unravel the intertwined effects of selective defaunation and overfaunation on the mammal-generated seed rain and dispersal kernels of three representative Mediterranean species. 2. Disentangle the effects of defaunation and overfaunation on plant recruitment and establishment of the three main target species. 3. Evaluate the joint impact of introduced pests and dense herbivore populations on the interactions between the endemic Mediterranean dwarf palm and subsequent animal associates (pollinators, insect seed predators).
Project
Environmental and socio-economic changes are causing increased levels of land abandonment worldwide, leading to noticeable changes in landscape cover which is particularly noticeable in southern Europe. This project, which will end in 2019, aims to understand how selective defaunation and disperser spatial behaviour limit endozoochore (re)colonization of old fields, accounting for spatially explicit patterns and processes of both focal plants and their dispersers. To this end, we are using DisPear, an individual-based spatially explicit simulation model to characterize endozoochore dispersal and recruitment kernels in old-fields, where target seed dispersers are subjected to selective defaunation. We are focusing into two old fields located in Spain and Portugal, respectively. To model the Spanish old field, we are using a unique dataset concerning: 1) plant population sizes, spatial distribution; 2) transition probabilities over a sequence of plant stages; 3) the retention time of seeds on disperser guts; 4) relative abundances, movements, and fecal delivering patterns of dispersers. To model the Portuguese old field, we plan to use the same analytical and modeling approaches as to the Spanish one but unknown parameters will be gathered from the bibliograhy. Our model DisPear thus is helping us to understand the recolonization process of Mediterranean oldfields under different sceneries of selective defaunation as well as to guide old-field restoration efforts. Importantly, DisPear is easily applicable to other species and landscapes; always that critical empirical data is available.