David Villegas-Ríos

David Villegas-Ríos
Spanish National Research Council | CSIC · Instituto de Investigaciones Marinas

PhD

About

73
Publications
93,063
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731
Citations
Citations since 2017
42 Research Items
573 Citations
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
Introduction
PhD on fish ecology. I'm particularly interested in fish behaviour and life history traits and the way they impact fish vulnerability. Additional interest in fish evolution and biogeography.
Additional affiliations
September 2018 - present
Spanish National Research Council
Position
  • PostDoc Position
May 2014 - January 2017
Institute of Marine Research, Norway
Position
  • PostDoc Position
Description
  • Fish behavior, fish telemetry, pace of life syndromes
March 2008 - November 2013
Spanish National Research Council
Position
  • PhD Student

Publications

Publications (73)
Article
The potential for populations to undergo adaptive evolution depends on individual variation in traits under selection and how multiple traits are correlated. While fitness relates to the performance of animals in the wild, most of the research on evolutionary potential of behavioural traits has used captive or mesocosm settings, especially with aqu...
Article
Marine reserves are valued for their ecological role: protecting fish populations from overharvesting while, at the same time, potentially maintaining fisheries yields via recruitment effects (net export of pelagic eggs and larvae) and spillover (net export of post-settled juveniles and mature fish) across reserve borders. Focussing on the spillove...
Article
Full-text available
Catchability, a key parameter in stock assessment, is often considered constant in time and space. However, when fishing with passive gears like traps or gillnets, fish behavior determines the odds of encounter with the fishers and thus catchability. Few studies have presented comprehensive empirical evidence of the link between behavior measured i...
Article
Full-text available
ABSTRACT: Fish body size is a key life history trait that influences population dynamics. Individual growth and size distribution are generally affected by both intrinsic and extrinsic factors. However, the drivers of body size changes are still poorly understood. The NW Iberian Peninsula is one of the most important fishing regions in Europe, wher...
Article
Energy allocation is an important component of life-history variation since it determines the tradeoff between growth and reproduction. In this study we investigated the state-dependent and sex-specific energy allocation pattern and the reproductive investment of a protogynous hermaphrodite fish with parental care. Individuals of Labrus bergylta, a...
Article
Full-text available
The effects of marine reserves on the life history and demography of the protected populations are well‐established, typically increasing population density and body size. However, little is known about how marine reserves may alter the behavior of the populations that are the target of protection. In theory, marine reserves can relax selection on...
Article
Marine protected areas (MPAs), and specially no-take areas (NTAs), play an important role in protecting target populations from fisheries. When developing spatial conservation and management tools, the design has mainly focused on population-level measures of fish home ranges, spawning and feeding areas, and migration routes. Intraspecific differen...
Article
Full-text available
The ocean is a key component of the Earth's dynamics, providing a great variety of ecosystem services to humans. Yet, human activities are globally changing its structure and major components, including marine biodiversity. In this context, the United Nations has proclaimed a Decade of Ocean Science for Sustainable Development to tackle the scienti...
Article
Discard reduction is a cornerstone of the European Common Fisheries Policy. The discard ban policy, which aims to reduce fisheries discards, is particularly challenging for small-scale fisheries. Demonstrating high survival rates of discarded individuals may provide flexibility to the application of the discard ban through the so-called survival ex...
Article
Environmental variables are known to regulate the reproductive output of marine intertidal organisms but typically these variables are studied as averages and interpreted at a macroscale level. Along 200 km of coast in NW Iberia a great variability in the reproductive activity of the stalked barnacle Pollicipes pollicipes was found among seven diff...
Article
Full-text available
Despite our critical dependence on aquatic wildlife, we lack a complete understanding of the drivers of population stability and structure for most fish species. Social network analysis has been increasingly used to investigate animal societies as it explicitly links individual decision-making to population-level processes and demography. While the...
Article
Full-text available
The positive effects of reduced fishing pressure in marine protected areas (MPAs) are now well documented globally. Yet, evidence of MPA benefits from long-term replicated before-after control-impact (BACI) studies and their usefulness in protecting target species are still rare, especially in northern temperate areas. Scientific rigor in the monit...
Article
Full-text available
La vieille commune, Labrus bergylta Ascanius, 1767, est la plus grande vieille vivant dans les eaux européennes et possède deux morphotypes de couleur de corps différents: uni et tacheté. Un gros spécimen tacheté a été capturé par un chasseur sous-marin sur la côte atlantique de la Galice (au nord-ouest de l’Espagne). La longueur totale était de 66...
Article
Full-text available
The effectiveness of Marine Protected Areas (MPAs) depends on the mobility of the populations that are the target of protection, with sedentary species likely to spend more time under protection even within small MPAs. However, little is understood about how individual variation in mobility may influence the risk of crossing an MPA border, as well...
Article
• Knowledge of the spatial behaviour of aquatic living resources is essential to assess their vulnerability to environmental and anthropogenic stressors and inform efficient management strategies. • Elasmobranchs are particularly vulnerable to exploitation. Within this group of fish, the implementation of species-specific conservation actions has b...
Article
Full-text available
Marine reserves can protect fish populations by increasing abundance and body size, but less is known about the effect of protection on fish behaviour. We looked for individual consistency in movement behaviours of sea trout in the marine habitat using acoustic telemetry to investigate whether they represent personality traits and if so, do they af...
Article
Full-text available
This article reviews a suite of studies conducted in a network of coastal Marine Protected Areas (MPAs) in Skagerrak, Southeast Norway. In 2006, Norway’s first lobster reserves were implemented, with the aim of protecting European lobster (Homarus gammarus) through a ban on fixed gear. A before–after control-impact paired series (BACIPS) monitoring...
Article
Individual acoustic tracking is a valuable tool to understand the behavioral ecology of aquatic species and to inform conservation actions. In this study, we examined the spatial behavior of single individuals of four common coastal fish species (striped red mullet, Mullus surmuletus;corkwing wrasse, Symphodus melops;pollack Pollachius pollachius;a...
Article
Understanding the responses of aquatic animals to temperature variability is essential to predict impacts of future climate change and to inform conservation and management. Most ectotherms such as fish are expected to adjust their behaviour to avoid extreme temperatures and minimize acute changes in body temperature. In coastal Skagerrak, Norway,...
Article
Full-text available
The study of phenotypic variation patterns among populations is fundamental to elucidate the drivers of evolutionary processes. Empirical evidence that supports ongoing genetic divergence associated with phenotypic variation remains very limited for marine species where larval dispersal is a common homogenizing force. We present a genome‐wide scale...
Article
Full-text available
As natural history disappears from our education, Gonzalo Mucientes and colleagues argue that technology can only take us so far in our comprehension of aquatic life. The Marine Biologist magazine
Article
Full-text available
Acoustic telemetry has become a popular means of obtaining individual behavioural data from a wide array of species in marine and freshwater systems. Fate information is crucial to understand important aspects of population dynamics such as mortality, predation or dispersal rates. Here we present a method to infer individual fate from acoustic tele...
Article
Harvest mortality typically truncates the harvested species' size structure, thereby reducing phenotypic complexity, which can lead to reduced population productivity, increased population variability, and selection on an array of life history traits that can further alter these demographic processes. Marine protected areas (MPAs) are a potential t...
Presentation
Full-text available
Todos los aspectos de la biología y ecología de las especies animales se desarrollan en el espacio. Por lo tanto, el estudio del papel que juegan los patrones espaciales en los procesos ecológicos (como la dinámica poblacional, interacciones entre especies o procesos de dispersión que finalmente afectan a su distribución) es vital para lograr una g...
Article
Full-text available
The site fidelity of ballan wrasse Labrus bergylta was studied using photo‐identification and external tagging. Five male individuals were observed to defend the same small territory composed of a few rocks during several reproductive seasons spanning 2 to 15 years. These results provide one of the strongest indications of long‐term very fine‐scale...
Article
Full-text available
Harvesting can have profound impacts on the ecology and evolution of marine populations. However, little is known about the strength and direction of fisheries‐induced selection acting on multiple traits in the wild. Here, we used acoustic telemetry to directly monitor individual behavior and fate in an intensively harvested species, the European l...
Article
Full-text available
Genetic divergence among populations arises through natural selection or drift and is counteracted by connectivity and gene flow. In sympatric populations, isolating mechanisms are thus needed to limit the homogenizing effects of gene flow to allow for adaptation and speciation. Chromosomal inversions act as an important mechanism maintaining isola...
Article
Full-text available
2018. First record of Epinephelus costae (Actinopterygii: Perciformes: Epinephelidae) from Galician waters (north-western Spain): Exploring the northward range expansion. Acta Ichthyol. Piscat. 48 (4): 399-402. Abstract. The first record of the goldblotch grouper, Epinephelus costae (Steindachner, 1878), from Galician waters is reported. Two specim...
Article
Full-text available
Although growing evidence supports the idea that animal personality can explain plasticity in response to changes in the social environment, it remains to be tested whether it can explain spatial responses of individuals in the face of natural environmental fluctuations. This is a major challenge in ecology and evolution as spatial dynamics link in...
Poster
Full-text available
Blue shark Prionace glauca (L. 1758) (Carcharhinidae) is an oceanic–epipelagic and fringe littoral species worldwide distributed in temperate and tropical oceans. It is one of the most abundant, widespread, fecund and fastest growing sharks. Blue shark also is one of the most exploited shark species globally and in European waters. The anomalous pr...
Article
Full-text available
The distribution and demographic patterns of marine organisms in the north Atlantic were largely shaped by climatic changes during the Pleistocene, when recurrent glacial maxima forced them to move south or to survive in northern peri-glacial refugia. These patterns were also influenced by biological and ecological factors intrinsic to each species...
Article
Full-text available
The ballan wrasse, Labrus bergylta (Labridae), is a protogynous hermaphrodite fish common in the north-eastern Atlantic from Norway to Morocco. It is a commercially important resource for local fisheries and is currently being used as cleaner fish to control sea lice in salmon farms in northern Europe. Two distinct colour patterns have been recentl...
Article
Full-text available
The ballan wrasse, Labrus bergylta (Labridae), is a protogynous hermaphrodite fish common in the north-eastern Atlantic from Norway to Morocco. It is a commercially important resource for local fisheries and is currently being used as cleaner fish to control sea lice in salmon farms in northern Europe. Two distinct colour patterns have been recentl...
Article
Full-text available
The Selvagens Islands are located in the northeastern Atlantic between the Canary Islands and Madeira Island. As a result of their small dimensions, remote location and harsh sea conditions only a few studies have been conducted to describe their marine species diversity. We were able to identify 29 new coastal fish species, an increase of 33% in t...
Article
Full-text available
Reproductive behavior affects spatial population structure and our ability to manage for sustainability in marine and diadromous fishes. In this study, we used fishery independent capture-based sampling to evaluate where Common Snook occurred in Tampa Bay and if it changed with spawning season, and passive acoustic telemetry to assess fine scale be...
Article
Full-text available
Ciliata mustela is a marine inshore fish which occurs from central Portugal to northeastern Norway. We studied the population structure of this species using cytochrome b gene and the first intron of the nuclear S7 ribosomal protein gene and samples ranging from central Portugal to Gullmars Fjord, Sweden. We tested the following alternative hypothe...
Article
Full-text available
The pollack, Pollachius pollachius, is an important commercial species for the Spanish artisanal fleet in Atlantic Iberian waters. This study provides information on the reproductive biology of the species, including length at maturity, reproductive cycle and gamete development pattern based on histological methods. A collection of 622 individuals...
Article
Full-text available
Fish populations are often treated as homogeneous units in typical fishery management, thereby tacitly ignoring potential intraspecific variation which can lead to imprecise management rules. However, intraspecific variation in life-history traits is widespread and related to a variety of factors. We investigated the comparative age-based demograph...
Data
Reparametrized von Bertalanffy growth function (rVBGF) parameters estimates with upper and lower 95% confidence intervals. (DOCX)
Data
Parameters of the unconstrained Von Bertalanffy growth functions with upper and lower 95% confidence intervals and Akaike Information Criteria (AIC) for each model. (DOCX)
Article
Effective fisheries management must consider spatial aspects of population dynamics, and acoustic telemetry has been extensively used to provide information on movement over different temporal and spatial scales. Here we used a fixed-receiver array to examine the spatio-temporal movement patterns of Labrus bergylta Ascanius 1767, a species heavily...
Article
Full-text available
For many fish populations reproductive patterns remain unknown, which often results in inadequate management strategies. Timing and intraspecific variability in the main reproductive traits of ballan wrasse (Labrus bergylta) were investigated based on microscopic analysis of gonads sampled from NW Spain in 2009-2012. This species displays two main...
Article
Full-text available
An annotated checklist of the marine fishes from Galician waters is presented. The list is based on historical both literature records and on new revisions. The ichthyofauna list is composed by 398 species. It is diversified in 2 superclasses, 3 class, 35 orders, 139 families and 288 genuses. Perciformes is the most diverse order with 37 families,...
Article
O2, N, P and Si net ecosystem metabolism of the Ría de Ares–Betanzos (NW Iberian upwelling system) was estimated during two 3-wk periods of contrasting summer downwelling and autumn upwelling conditions by means of a transient 2-D kinematic box model. The subtidal circulation was positive in both situations, although it was depressed during downwel...
Article
Full-text available
Le gobie à tête jaune, Gobius xanthocephalus, est signalé pour première fois en Galice. Ce rapport établit une nouvelle limite nord de la répartition de cette espèce dans l’océan Atlantique. De nouveaux caractères méristiques et descriptifs sont présentés: rayons branchiostèges, nombre de branchiospines et de vertèbres, et description des dents et...
Article
Full-text available
During the summer of 2008, juveniles of the Atlantic horse mackerel Trachurus trachurus were found in association with the hydromedusae Aequorea forskalea in north-western Spain. This is the first report of association for this pair of species in the world.
Article
Full-text available
Little is known about the early development stages of Parablennius ruber. In this paper the following stages are described, and illustrations provided for the first time: middle stage egg, late stage egg, yolk-sac larva and preflexion larva. Recently laid eggs were spherical and orange, attached to the substratum in rock crevices. Eggs measured 1.0...

Questions

Questions (15)
Question
Hi.
I´m running a cox model in R with the following structure:
sur_Are_beh_final <- coxph(Surv(tracking_time, survival)~year_tagged_f+dvmsummer_s+year_tagged_f:dvmsummer_s, data=dataare,na.action=na.omit)
  • dvmsummer is a continuous variable, scaled
  • year_tagged is a factor variable with 3 levels.
Now I´d like to plot some predictions of this model using a new data frame. In particular I´d like to obtain one survival curve for each year:
new_df <- with(dataare,data.frame(dvmsummer_s=0,year_tagged_f = as.factor(c("2011","2012","2013"))))
If I try this (as suggested here: https://github.com/kassambara/survminer/issues/67):
fit <- survfit(sur_Are_beh_final, newdata = new_df,data=dataare)
ggsurvplot(fit, conf.int = TRUE, palette = "Dark2",censor = FALSE, surv.median.line = "hv")
I get this error:
Error: object of type 'symbol' is not subsettable
If I try this (as suggested here: https://github.com/kassambara/survminer/issues/283)
fit <- survfit(Surv(tracking_time, survival)~year_tagged_f+dvmsummer_s+year_tagged_f:dvmsummer_s, data = dataare)
then I get this error:
Error in survfit.formula(Surv(tracking_time, survival) ~ year_tagged_f + :
Interaction terms are not valid for this function
So I cannot even run ggsurvplot(fit, data = dataare)
Is there any workaround to be able to produce predictions when the model contains an interaction term?
Thanks
Question
Hi
In the personality literature there is increasing evidence on how different individuals can respond in a different (and consistent) way to changes in an environmental variable (e.g. temperature).
I was wondering if there is any evidence of the effect of personality (being bolder or shier, for instance) in how individuals can cope with environmental change. This is, are bolder individuals more resilient to temperature changes for instance? Does it give them any advantage? I need reports from wild animals, under natural conditions.
Any idea?
Thanks, 
David
Question
Hi!
I have measured the same variable in three different assays. The variable is a classical "time to event" variable that ranges between 0 and 1200 seconds. I also have a variable "state" which is coded as "1" if the event occurred or "0" if it did not occur (cases in which the animal didn't react before the experiment was finished)
Within each assay, I have measure this variable 3 times per individual. 
I want to assess if this variable differs among my three assays. I want to use R software.
I have thought of running a survival analysis or something similar, but I have no experience with this. My questions are:
1) What would be the correct function and library in R to conduct this analysis?
2) Do I need to account for the fact that I have repeated measures?
I have searched the web but found no clear response, specially for 2
Thanks in advance
Question
Hi.
In a repeated measurements experiment (several behaviors measured multiple times), I found that traits are repeatable (interindividual consistency). Now I need to pick one single value per individual (as representative of all replicates) for further analysis (i.e. to correlate with other variables). Would it be better to get the mean of all replicates, or a BLUP obtained from the mixed model used to estimate repeatability (which includes some covariates as well)? Any other alternative?
Thanks!
Question
Dear all,
One can use a mixed-model framework to estimate repeatability (R) of a trait, for example a behavioral trait. Repeatability is calculated based on the two variance components obtained from the model: residual (within-individual variance) and random (between-individual variance). The good point about using mixed-models for estimating R is that one can account for confounding (fixed or random) effects, and model correlation and heteroscedasticity, among other advantages.
A key reference in the topic explains that: "Data-level predictors that are associated with individual data points will usually increase the repeatability estimates (such as age if the same individual was measured at different ages), since they tend to reduce residual variance . On the contrary, individual-level predictors that vary between individuals (such as hatching order or sex) will usually decrease both agreement and adjusted repeatability, since they reduce the between-group variance (Gelman & Hill, 2007). Confounding factors that vary within as well as between individuals may decrease or increase both types of repeatability depending on the nature of the trade-offs" Nakagawa and Schielzeth, 2010.
When working on a mixed-model approach, however, sometimes it can be necessary to account for correlation of the residuals (for example for traits repeatedly measured over time) using correlation structures like corAR1 in lme. Similarly, one might need to account for heteroscedasticity incorporating a weights argument to the model (in the case of lme in R).
When this is neccessary, what is the predicted effects of those terms on the random and residual variances (and therefore in R): increase, decrease or unpredictable?
Thank you so much.
David
Question
Hi all,
I'm trying to estimate the home range of 40 individuals with kernelUD function in adehabitatHR. I want to estimate the HR in a grid previously defined by myself. The grid includes all the study area. This is how I construct the grid in a proper class (SpatialPixelsDataFrame):
polyx<-c(495000,499000,499000,495000,495000)
polyy<-c(6494000,6494000,6498500,6498500,6494000)
loc=as.data.frame(cbind(polyx,polyy))
coordinates(loc)=c("polyx","polyy")
proj4string(loc) <- CRS("+proj=utm +zone=32")
loc4=raster(loc,nrows=1000,ncols=1000)
loc5=as(loc4, "SpatialPixelsDataFrame")
# Here I get this warning but the grid is constructed as expected
Warning message:
In asMethod(object) :
object has no values, returning a "SpatialPixels" object
As you can see in the attached plot, the limits of the grid include all the detections.
If I run these two lines to estimate the area of the home range for each individual...
kud=kernelUD(detections[,1],h=h, grid=loc5,extent=2,kern=c("bivnorm"))
area=kernel.area(kud, percent=95,unin ="m",unout="km2")
...I get an erroneus result (a value of 16 for all the fish) and 40 warnings:
In kernel.area(j, percent, unin, unout) :
The grid is too small to allow the estimation of home-range
for the following value of percent: 95. You should rerun kernelUD with a larger extent parameter
I have rerun the code with extent=5 and extent=20 (as suggested by the warnings), but the result is the same.
Any suggestion on how to properly pass a grid created by the user?
Thank you.
David

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