Valerio Sbragaglia

Valerio Sbragaglia
Spanish National Research Council | CSIC · Institute of Marine Sciences

PhD

About

76
Publications
21,170
Reads
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846
Citations
Citations since 2016
57 Research Items
777 Citations
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Introduction
I am a behavioral ecologist with strong interest in fisheries. My model species include marine crustaceans and fishes, as well as zebrafish. Particularly interested in fisheries-induced changes of animal behavior. Moreover, I have a strong interdisciplinary research interest in recreational fisheries, in particular spearfishing.
Additional affiliations
August 2011 - present
Marine Science Institute
Position
  • RITFIM (Behavioural and physiological rhythms in deep water marine crustaceans)
August 2011 - July 2016
Institut de Ciències del Mar
Position
  • PhD Student
Education
September 2010 - September 2011
University of Barcelona
Field of study
  • AQUACULTURE
September 2006 - October 2008
Tuscia University
Field of study
  • Marine Environmental Science
September 2003 - December 2006
Tuscia University
Field of study
  • Marine Environmental Science

Publications

Publications (76)
Article
Full-text available
Size-selective mortality may evolutionarily alter life-history as well as individual behavioral and physiological traits. Moreover, size-selective mortality can affect group behavioral traits, such as shoaling and collective properties (e.g., shoal cohesion), which are relevant for finding food and reducing risk of predation. Here, we present exper...
Article
Full-text available
Marine recreational spearfishing is practiced by a small proportion of recreational fishers and ecological, social and economic aspects of such activities are poorly understood with respect to recreational angling. The Italian Federation of Sport Fishing and Underwater Activities (FIPSAS) started in 2009 the collection of catch data related to Ital...
Article
Full-text available
Fisheries are among the human activities that are most strongly affected by ongoing climate-related changes in the presence and abundance of fish species across the globe. The ecological and social repercussions of such changes for recreational fisheries are however still poorly understood. Here, we compare selected ecological and social dimensions...
Article
Recreational fisheries are diverse in scale, scope, and participation worldwide, constituting an important ecosystem service of marine and freshwater ecosystems. Management of these socio‐ecological systems is challenged by monitoring gaps, stemming from difficulties engaging with participants, biased sampling, and insufficient resources to conduct...
Article
Behavioral rhythms are a key aspect of species fitness, since optimize ecological activities of animals in response to a constantly changing environment. Cabled observatories enable researchers to collect long-term biological and environmental data in real-time, providing relevant information on coastal fishes' ecological niches and their temporal...
Article
Full-text available
The ongoing contemporary biodiversity crisis may result in much of ocean’s biodiversity to be lost or deeply modified without even being known. As the climate and anthropogenic-related impacts on marine systems accelerate, biodiversity knowledge integration is urgently required to evaluate and monitor marine ecosystems and to support suitable respo...
Article
Intensive and size-selective harvesting is an evolutionary driver of life-history as well as individual behavioral traits. Yet, whether and to what degree harvesting modifies the collective behavior of exploited species is largely unknown. We present a multi-generation harvest selection experiment with zebrafish (\textit{Danio rerio}) as a model sp...
Article
We highlight important steps that researchers should follow when using social media data, in particular when the aim of their research is to characterize illegal fishing. Specifically, we provide a checklist of mitigation strategies focusing on data privacy concerns and ethical principles associated with human-subject research. We hope our reflecti...
Preprint
Spearfishing is practiced by a small fraction of younger recreational fishers and has received considerably less scientific attention than angling. This knowledge gap may negatively affect the ability for developing sustainable marine recreational fisheries. We address this through a global systematic review of the literature pertaining to marine s...
Article
Full-text available
Social media may provide information for monitoring recreational fisheries, but several caveats prevent operationalization. Specifically, the fraction and profile of recreational fishers sharing their catches is not known. Our aim was to advance the monitoring capacities of recreational fishing using social media data. We collected data with onsite...
Article
Full-text available
This work is the result of an international research effort to determine the main impacts of the COVID-19 pandemic on marine recreational fishing. Changes were assessed on (1) access to fishing, derived from lockdowns and other mobility restrictions; (2) ecosystems, because of alterations in fishing intensity and human presence; (3) the blue econom...
Preprint
Full-text available
Fisheries are among the human activities that are most strongly affected by ongoing climate-related changes in the presence and abundance of fish species across the globe. The ecological and social repercussions of such changes for recreational fisheries are however still poorly understood. Here, we explore selected ecological and social dimensions...
Article
We outline key mechanisms by which fishing can change the shoaling tendency and collective behaviour of exploited species – an issue that is rarely considered and poorly understood. We highlight potential consequences for fish populations and food webs, and discuss possible repercussions for fisheries and conservation strategies.
Article
Full-text available
Consistent inter-individual differences in daily activity rhythms (i.e., chronotypes) can have ecological consequences in determining access to food resources and avoidance of predators. The most common measure to characterize chronotypes in animals as well as humans is the onset of activity (i.e., early or late chronotypes). However, daily activit...
Article
iEcology and conservation culturomics are two emerging research approaches that rely on digital data for studying ecological patterns and human-nature interactions. We applied data mining of videos published on YouTube related to recreational fishing of four species of groupers (family: Epinephelidae) in Italy between 2011 and 2017 to learn whether...
Article
Full-text available
Size-selective mortality is common in fish stocks. Positive size-selection happens in fisheries where larger size classes are preferentially targeted while gape-limited natural predation may cause negative size-selection for smaller size classes. As body size and correlated behavioural traits are sexually selected, harvest-induced trait changes may...
Article
Artificial light at night (ALAN) is one of the most extensive human geographic disturbances to wildlife. ALAN can have ecological and evolutionary effects on individual organisms, which in turn can affect populations, communities and ecosystems. Although understanding of the effects of ALAN on the ecology and biology of organisms has increased in r...
Article
Full-text available
We show that marine recreational spearfishers voluntarily organize bottom-up conservation actions. The main goals of these actions are to provide support to research in monitoring fish assemblages, tracking biological invasions or mitigating impacts on the environment, such as those stemming from pollution and littering. We show that such initiativ...
Article
Full-text available
The ongoing digital revolution in the age of big data is opening new research opportunities. Culturomics and iEcology, two emerging research areas based on the analysis of online data resources, can provide novel scientific insights and inform conservation and management efforts. To date, culturomics and iEcology have been applied primarily in the...
Article
Full-text available
1. Intensive and trait‐selective mortality of fish and wildlife can cause evolutionary changes in a range of life‐history and behavioral traits. These changes might in turn alter the circadian system due to coevolutionary mechanisms or correlated selection responses both at behavioral and molecular levels, with knock‐on effects on daily physiologic...
Article
Full-text available
This Collective Article presents information about 21 taxa belonging to seven Phyla (one Ochrophyta, one Porifera, three Cni-daria, two Arthropoda, three Mollusca, one Echinodermata, and ten Chordata) and extending from the western Mediterranean Sea to the Levantine Sea. The new records were reported from nine countries as follows: Spain: first rec...
Preprint
Full-text available
Daily behavioural rhythms provide ecological advantages with respect to exploitation of food resources and avoidance of predation and recent studies suggested that timing of activity could form a behavioural syndrome with risk-taking behavior. Moreover, the role of daily activity rhythms in biological invasions is unknown. Here, we investigated whe...
Preprint
Full-text available
Many fisheries around the globe preferentially capture large individuals with implications for the evolution of exploited populations. Fisheries-induced evolution may alter collective behavioral phenotypes through individual-level adaptations that affect boldness, swimming speed and tendency to follow social vs. environmental cues. Studying the beh...
Article
We applied data mining on YouTube videos to better understand recreational fisheries targeting common dentex (Dentex dentex), an iconic species of Mediterranean fisheries. In Italy alone, from 2010 to 2016 spearfishers posted 1051 videos compared to 692 videos posted by anglers. The upload pattern of spearfishing videos followed a seasonal pattern...
Article
Full-text available
In an increasingly anthropic world, humans have profound impacts on the distribution and behaviour of marine fishes. The increased human presence has modified fishes’ antipredator behavioural responses, and consequently flight decisions, as a function of their changed perceptions of risk. Understanding how fish react to human presence can help iden...
Article
Full-text available
Climate change and biological invasions are rapidly reshuffling species distribution, restructuring the biological communities of many ecosystems worldwide. Tracking these transformations in the marine environment is crucial, but our understanding of climate change effects and invasive species dynamics is often hampered by the practical challenge o...
Preprint
Marine recreational fishers accumulate a vast amount of Local Ecological Knowledge (LEK) during their fishing activity that can be of paramount importance for monitoring how climate change affects the structure of biological communities. Here, we accessed the LEK of recreational anglers and recreational spearfishers to investigate the increase in t...
Preprint
Full-text available
The circadian system is phylogenetically conserved across a wide range of taxa. It orchestrates organismal biological processes and is linked to life history and risk-taking behavior. Fisheries-induced evolution affects life history and may also alter behavioral traits in exploited populations. Thus, intensive and selective harvesting may lead to t...
Article
1.The role of sexual selection in the context of harvest‐induced evolution is poorly understood. However, elevated and trait‐selective harvesting of wild populations may change sexually‐selected traits, which in turn can affect mate choice and reproduction. 2. We experimentally evaluated the potential for fisheries‐induced evolution of mating behav...
Article
We present a protocol related to a video-tracking technique based on the background subtraction and image thresholding that makes it possible to individually track cohoused animals. We tested the tracking routine with four cohoused Norway lobsters (Nephrops norvegicus) under light-darkness conditions for 5 days. The lobsters had been individually t...
Article
In most fisheries, larger fish experience substantially higher mortality than smaller fish. Body length, life‐history and behavioral traits often correlate, such that fisheries‐induced changes in size or life‐history can also alter behavioural traits. However, empirical evidence regarding how size‐selective harvesting alters the evolution of behavi...
Article
Full-text available
The seasonal timing of recurring biological processes is essential for organisms living in temperate regions. While ample knowledge of these processes exists for terrestrial environments, seasonal timing in the marine environment is relatively understudied. Here, we characterized the annual rhythm of habitat use in six fish species belonging to the...
Preprint
Full-text available
In fisheries worldwide, larger fish are subjected to substantially greater fishing mortality than smaller fish. Body length and behavioral traits are often correlated, such that fisheries-induced changes in either behaviour or morphology can also alter other traits as result of direct or indirect selection. Consistent behavioral differences among i...
Preprint
Data about recreational fisheries are scarce in many areas of the world. In the absence of monitoring data collected in situ, alternative data sources, such as digital applications and social media platforms, have the potential to produce valuable insights. Yet, the potential of social media for drawing insights about recreational fisheries is stil...
Article
Marine recreational fishers accumulate a vast amount of local ecological knowledge(LEK) during their fishing activity that can be of paramount importance for monitoring how climate change affects fish assemblages. We assessed LEK of recreational fishers to investigate the increase in the abundance of five northward expanding indigenous thermophilic...
Article
Full-text available
The spot-fin porcupinefish, Diodon hystrix Linnaeus, 1758, was first recorded in the Mediterranean by Torchio (1963), from the Gulf of Taranto, Italy. There have been no subsequent records, from this sea, ever since. In this paper, we report a new record of D. hystrix from the Balearic Islands, western Mediterranean, fifty-five years after the firs...
Article
Full-text available
The Norway lobster Nephrops norvegicus is the most important commercial crustacean species in Europe. Recent decline in wild captures and a reduction in total abundance and size at first maturation indicate that the species is overexploited. Increasing knowledge of its reproduction, specifically at the molecular level will be mandatory to improving...
Article
Full-text available
Marine cabled video-observatories allow the non-destructive sampling of species at frequencies and durations that have never been attained before. Nevertheless, the lack of appropriate methods to automatically process video imagery limits this technology for the purposes of ecosystem monitoring. Automation is a prerequisite to deal with the huge qu...
Article
In a landscape of fear, humans are altering key behaviours of wild-living animals, including those related to foraging, reproduction, and survival. When exposed to potentially lethal human actions, such as hunting or fishing, fish, and wildlife are expected to behaviourally respond by becoming shyer and learning when to be cautious. Using a rich da...
Article
Full-text available
Animals fight over resources such as mating partners, territory, food or shelter and repeated contests lead to stable social hierarchies in different phyla. The group dynamics of hierarchy formation are not characterized in the Norway lobsters (Nephrops norvegicus). Lobsters spend most of the day in burrows and forage outside of them according to a...
Preprint
Full-text available
In a landscape of fear, humans are altering key behaviors expressed by wild-living animals, including those related to foraging, reproduction and survival. When exposed to potentially lethal human actions, such as hunting or fishing, fish and wildlife is expected to behaviorally respond by becoming more timid, but proving such responses underwater...
Article
Full-text available
Background The Norway lobster, Nephrops norvegicus, is economically important in European fisheries and is a key organism in local marine ecosystems. Despite multi-faceted scientific interest in this species, our current knowledge of genetic resources in this species remains very limited. Here, we generated a reference de novo transcriptome for N....
Article
Full-text available
Animals living in the intertidal zone are exposed to prominent temperature changes. To cope with the energetic demands of environmental thermal challenges, ectotherms rely mainly on behavioral responses, which may change depending on the time of the day and seasonally. Here, we analyze how temperature shapes crabs' behavior at 2 different times of...
Conference Paper
Full-text available
Abstract – Cabled observatories offer new opportunities to monitor species abundances at frequencies and durations never attained before. When nodes bear cameras, these may be transformed into the first sensor capable of quantifying biological activities at individual, populational, species, and community levels, if automation image processing can...
Conference Paper
Full-text available
The abundance and composition of fish assemblages varies at different temporal scales as a product of diel and annual rhythms. In this study, we used a video-wired observatory (OBSEA, www.obsea.es) to monitor annual rhythms in a coastal fish assemblage with a 3-year data set (2012-2014). The photographs were acquired at 30 min frequency. Five speci...
Conference Paper
Automated video and image analysis can be a very efficient tool to behavior study, especially in hard access environments for researchers. The understanding of this social behavior can play a key role in the sustainable design of control policies of many species. This paper proposes the use of computer vision algorithms to identify and track, the N...
Research
Full-text available
The Spearfishing Association of Barcelona (APS) recently celebrated its 70 th anniversary and decided to write a manifesto called: " The Barcelona Agreement: A Manifesto Towards the Spearfishing of the Future ". The Manifesto was discussed and approved during a round table at the Maritime Museum of Barcelona on 27 February 2016, in which delegates...
Article
The deep sea is the largest and at the same time least explored biome on Earth, but quantitative studies on the behavior of bathyal organisms are scarce because of the intrinsic difficulties related to in situ observations and maintaining animals in aquaria. In this study, we reported, for the first time, laboratory observations on locomotor rhythm...
Article
Full-text available
The Norway lobster, Nephrops norvegicus, is a burrowing decapod with a rhythmic burrow emergence (24 h) governed by the circadian system. It is an important resource for European fisheries and its behavior deeply affects its availability. The current knowledge of Nephrops circadian biology is phenomenological as it is currently the case for almost...
Article
The inclusion of behavioral components in the analysis of a community can be of paramount importance in marine ecology. Diel (i.e., 24-h based), seasonal activity rhythms, or longer durational in behavioral responses can result in shifts in populations, and therefore on measurable abundances. Here, we review the value of developing cabled video obs...
Article
Light is the most important zeitgeber for the synchronization of biological rhythms in terrestrial organisms. In the sea, the light intensity progressively decreases, and tidal currents might control behavioural rhythms at disphotic depths. The Norway lobster, Nephrops norvegicus, is distributed from the upper shelf to middle slope areas. Its burro...
Article
Patterns of how the Norway lobster (Nephrops norvegicus L.) emerges from its burrow in relation to sea currents at different times of the day–night cycles is currently unknown. The degree of influence of these variables when simulated in controlled laboratory conditions entails great technical and technological difficulties. This paper presents the...
Article
The Norway lobster, Nephrops norvegicus, can be captured by haul nets only during the emergence from its burrow. In the last few decades, an extensive field research revealed distinct diel (24-h–based) catchability patterns at different depths. Laboratory experiments suggested that burrow emergence (used as a proxy of catchability) is endogenously...
Data
The field measurements of swimming activity rhythms of fishes are scant for the difficulty of counting individuals at a high frequency over a large period of time. Cabled observatory video monitoring allows such a sampling at a high frequency. Unfortunately, automated animal visual counting is still a major bottleneck. We developed a new automated...
Article
Full-text available
Artificial reef areas can be used for management and conservation of commercially exploited crustacean decapods but their behaviour in these environments is poorly characterised. Acoustic tags were used to study the behaviour of 3 adult spiny lobsters (Palinurus mauritanicus) and 3 adult spider crabs (Maja squinado) over a period of 64 days in summ...
Article
Full-text available
Field measurements of the swimming activity rhythms of fishes are scant due to the difficulty of counting individuals at a high frequency over a long period of time. Cabled observatory video monitoring allows such a sampling at a high frequency over unlimited periods of time. Unfortunately, automation for the extraction of biological information (i...
Conference Paper
Full-text available
High frequency monitoring and the reducing of disturbance of sampling activities have a vital importance in the study of fish communities. The aim of this paper is to describe temporal patterns in habitat utilization by a coastal fish assemblage throughout the year 2012. A high frequency long term photo identification monitoring has been carried ou...