Gorka Bidegain

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• Applied Mathematics in Marine Systems, PhD
• Professor at University of the Basque Country

Marine bivalves acquire infectious diseases either through direct contact or by filtering pathogens during feeding. Once acquired, the progression of infection in the host is mediated by environmental conditions, the host condition, host defense system, and pathogen proliferation. Marine bivalves tend to exist with a high body burden of infection a...

In recent decades, the global expansion of Pacific oyster Magallana gigas aquaculture, driven by this species’ adaptability and rapid growth, has coincided with the emergence of novel and virulent microvariants (muvars) of Ostreid herpesvirus 1 (OsHV-1), causing significant industry losses. As a potential alternative, the eastern oyster (Crassos...

Recruitment and growth of the gooseneck barnacle Pollicipes pollicipes (Gmelin, 1791) are essential life history parameters needed for the monitoring and assessment of the fishery performance and establishment of sustainable management practices. Here, intra-annual variability in recruitment and growth of the gooseneck barnacle P. pollicipes was fi...

Editorial on the Research Topic Advances in autonomous ships (AS) for ocean observation. Ocean observation is the basis for understanding and studying marine science. In recent years, the application of autonomous ships (AS), including Unmanned Surface Vessels (USVs), Autonomous Underwater Vehicles (AUVs), and Remotely Operated Vehicles (ROVs), i...

With increasing impacts of climate change and human activities on marine ecosystems, accurate assessment of benthic ecological quality status (EcoQs) has become increasingly important for ecosystem management and restoration. Here, we used five macrobenthos-based biotic indices (the AZTI marine biotic index (AMBI), multivariate AZTI marine biotic i...

Many different indices have been developed to evaluate habitat quality status (EcoQs) in marine ecosystems; however, few studies have concurrently considered both abiotic and biotic indices in their assessments of benthic EcoQs. Here, we propose and test a framework for integrating heavy metal pollution-related indices and macrobenthos-based indice...

Temperature is a critical factor that influences the proliferation of pathogens in hosts. One example of this is the human pathogen Vibrio parahaemolyticus (V. parahaemolyticus) in oysters. Here, a continuous time model was developed for predicting the growth of Vibrio parahaemolyticus in oysters under varying ambient temperature. The model was fit...

The Graphical User Interface (GUI) MarineEpi is presented as a Matlab toolbox for easily (i) constructing disease transmission models for different marine host-pathogen systems, (ii) running simulations by specifying initial conditions and model parameters, and (iii) interpreting the resulting time series of the host and pathogen population dynamic...

Seagrass systems are in decline, mainly due to anthropogenic pressures and ongoing climate change. Implementing seagrass protection and restoration measures requires accurate assessment of suitable habitats. Commonly, such assessments have been performed using single-algorithm habitat suitability models, nearly always based on low environmental res...

Although increasing student motivation is widely accepted to enhance learning outcomes, this relationship has scarcely been studied quantitatively. Therefore, this study aimed to address this knowledge gap by exploring the effects of gamification on students’ motivation and consequently their learning performance, regarding the proper application o...

Marine wildlife and aquaculture species can accumulate large amounts of marine microplastic debris (MMD) (<1 mm) carrying pathogens, thus threatening the health of marine ecosystems and posing a risk to food safety and human health. Here, we outline a theoretical three-perspective approach for studying the relationship between MMD and disease. Firs...

Marine wildlife and aquaculture species can accumulate large amounts of marine microplastic debris (MMD) (<1 mm) carrying pathogens, thus threatening the health of marine ecosystems and posing a risk to food safety and human health. Here, we outline a theoretical three-perspective approach for studying the relationship between MMD and disease. Firs...

Chemical fingerprints in otoliths are commonly used as natural habitat markers in fishes. Alternatively, the first dorsal fin spine can provide valuable chemical information and may be more suitable for studying (i) endangered fish species that cannot be sacrificed for their otoliths or (ii) fishes for which otoliths might not be available because...

Since December 2019, the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread rapidly from Wuhan (China) across the globe, affecting more than 200 countries by mid-2021, with over 190 M reported cases and around 4 M fatalities. During the first year of the pandemic, affected countries implemented a variety of nonpharmaceuti...

The interannual variations in absolute and relative densities of copepods from the neritic waters of the southeastern Bay of Biscay and their relationship to climate teleconnections and local environmental factors were assessed using time series for the 1998–2015 period. Opposite patterns of variation of the absolute densities of spring Acartia cla...

The unique characteristics of marine ecosystems have pushed investigators to refine well-tested and widely applied epidemiological modeling methods to understand marine disease dynamics. This chapter begins by reviewing models used to quantify within-host parasite dynamics in open marine ecosystems where infection is near universal. These models ar...

The Program for International Student Assessment (PISA) 2015 is focused on students’ competency in science, providing wide data banks for the analysis of the interaction between science performance and attitudes toward science. The few attempts to study this relationship in other assessment studies suggest some positive correlations on the individu...

Resumen El Programa internacional para la evaluación de estudiantes (PISA) 2006 y PISA 2015 se centran en la competencia científica de los estudiantes, proporcionando amplios bancos de datos para el análisis de la interacción entre el rendimiento de los estudiantes en ciencias y las actitudes no cognitivas hacia las ciencias. Los pocos estudios que...

Some marine microparasitic pathogens can survive several months in the water column to make contact with or to be absorbed or filtered by hosts. Once inside, pathogens invade the host if they find suitable conditions for reproduction. This transmission from the environment occurs via pathogens released from infected and dead infected animals. Some...

Kelp sea farming is performed using seedlings (early stage of sporophyte development) attached to string, known as seedling string, which are produced from an indoor culture under controlled environmental conditions. However, very little is known about the influence of water movement and the optimal growth level of early kelp sporophytes on string....

Polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs), including hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs), were studied in the surface sediments of Qingduizi Bay (Yellow Sea, China). The goal was to identify whether their distribution and levels can be influenced by aquaculture activities in ponds. T...

The occurrence and estrogenic activities of seven phenolic endocrine-disrupting chemical (EDC) compounds (nonylphenol (NP), octylphenol (4-OP), 2,4-dichlorophenol (2,4-DCP), 4-tertbutylphenol (4-t-BP), 4-tert-octylphenol (4-t-OP), tetrabromobisphenol A (TBBPA), and bisphenol A (BPA)) in the sediments of Qingduizi Bay (NorthernYellow Sea, China) in...

MER Master (UPV/EHU), MER Consortium, Res Ctr Exper Mar Biol & Biotech (Plentziako Itsas Estazioa; PiE-UPV/EHU), University of the Basque Country

Risks associated with disease spread from fish and shellfish farming have plagued the growth and public perception of aquaculture worldwide. However, by processing nutrients and organic material from the water column, the culture of many suspension-feeding bivalves has been proposed as novel solution toward mitigating problems facing coastal water...

The gooseneck barnacle Pollicipes pollicipes is a very valuable marine resource on the coasts of Spain and Portugal. To maintain the sustainable exploitation of this species, periodical large-scale population assessments are essential. Because of the heterogeneous distribution of these populations in aggregates, together with the difficulties assoc...

Marine bivalves acquire infectious diseases either through direct contact or by filtering pathogens during feeding. Once acquired, the progression of infection in the host is mediated by environmental conditions, the host condition, host defense system, and pathogen proliferation. Consequently, models developed for disease effects on host populatio...

Disease transmission in benthic filter feeders often occurs directly via filtration of microparasitic pathogens from the water column during feeding. Consequently, models developed to understand this type of transmission must represent not only biological processes occurring during the progression of infection in the host but also hydrodynamic proc...

Dermo disease caused by the protistan Perkinsus marinus in Eastern oysters Crassotrea virginica is an important source of mortality impacting oyster population dynamics resulting in substantial losses in fisheries and aquaculture. The rapid transmission and spread of the disease minimized the importance of transmission models and past models (proli...

The purple sea urchin P. lividus is a marine resource greatly valued for its highly nutritious roe. The objective of this work is to analyse the spatial distribution pattern and population structure of this species in the region of Cantabria (Bay of Biscay) in order to identify the most appropriate zones for sustainable harvesting and for the estab...

Disease-causing organisms can have significant impacts on marine species and communities. However, the dynamics that underlie the emergence of disease outbreaks in marine ecosystems still lack the equivalent level of description, conceptual understanding, and modeling context routinely present in the terrestrial systems. Here, we propose a theoreti...

Past theoretical models suggest fishing disease-impacted stocks can reduce parasite transmission, but this is a good management strategy only when the exploitation required to reduce transmission does not overfish the stock. We applied this concept to a red abalone fishery so impacted by an infectious disease (withering syndrome) that stock densiti...

The understanding of waterborne microparasitic disease transmission in bivalve filter feeders requires consideration of both biological and hydrodynamic processes. The dose of infective cells received by a filter feeder depends on the concentration of these particles in the water column, which is affected by the relative rates of supply and removal...

Disease transmission in sessile filter feeders is proposed to occur by freely drifting infectious particles (IP) released by sick and dead animals. A susceptible /infected/particle (SIP) model is developed to analyze disease processes. The infection Ro, estimated from the proposed model, increases in proportion to the ratio of particle production t...

After the emergence of abalone withering syndrome (WS) in the 1980s, the California Fish and Game Commission was faced with a difficult decision: close southern California’s iconic abalone fishery or continue harvest in the face of uncertain disease impacts. The Commission closed the fishery, an understandable action given the crisis, What if fishi...

Marine diseases pose a challenge for restoration of marine resources including early intervention after the appearance of disease, subsequent intervention to limit a decline in host abundance and to implement measures to restrain that decline once it occurs, and restoration of habitat to limit ecosystem services impacts. The majority of disease mod...

The rock sea urchin P. lividus constitutes a very valuable marine resource which must be carefully managed. The objective of this work is to identify the most appropriate locations for the sustainable harvesting of P. lividus in the coast of Cantabria (Bay of Biscay) in order to establish adequate management measures. The study was carried out in f...

Suspension-feeding bivalve molluscs are confronted with a wide range of materials in the benthic marine environment. These materials include various sized plankton and the organic material derived from it, macroalgae, detritus and a diversity of microbial parasites that have adapted life stages to survive in the water column. For bivalve parasites...

Parasites with free-living life stages often function as prey to generalist consumers. Their ubiquity throughout the water column suggests that parasite consumption is a major pathway for disease transmission in nearshore marine systems, particularly for sessile hosts that rely on suspension and deposit feeding activities to contact food particles....

Disease transmission in filter feeders often occurs directly via filtration of waterborne pathogens. We explored the relationship between host density , pathogen dilution and disease risk using a compartmental model , which incorporates the effect of a dose-­‐response mechanism and the potential of a remote volume , adjacent to the local volume dir...

Competitive interactions among and between species can drive the emergence and persistence of disease. Hosts often encounter pathogens while feeding, but interactions between hosts for food resources and their associated pathogens have only recently been integrated into studies of disease transmission. Oyster reefs, their commensal filter-feeding f...

Benthic filter feeders are able to filter a substantial amount of waterborne pathogens such as bacteria, fungi, protozoans, and viruses from a dilute solution. Arguably, this life style is highly vulnerable to disease transmission. However, some mechanisms such as dense assemblages of filter feeders should reduce infective particles in the water co...

The dynamics that underlie the generation of epizootics in marine ecosystems still lack the equivalent level of description, conceptual understanding, and epizootiological modeling framework routinely present in the terrestrial environment. Here, we propose a theoretical basis for the transmission dynamics of marine infectious diseases (MIDs) by me...

Presence-only data based habitat suitability (HS) modelling is proposed as an adequate tool to determine environmentally homogenous zones that support sampling strategies and face limitations associated to spatial interpolations in shellfish stock assessments. For the first purpose, together with geostatistic tools, HS modelling would be applied to...

This conference paper is a summary of the project 'Development of a theoretical basis for modeling disease processes in marine invertebrates'. The objective is to develop the theoretical basis to understand how epizootics are initiated and terminated in marine invertebrate populations and how this process is supported by transmission. The project c...

An adequate nonparametric regression model is able to record specific patterns in the data that cannot be detected by a parametric model. In addition, quantile regression can provide a more complete description of functional changes than an exclusive focus on the least square regression. This chapter assesses the adequacy of a variety of nonparamet...

The common infectious shellfish diseases are problematic causing important ecological and economical impacts. Although they have been extensively studied, the dynamics of infection require an innovative approach to disease modeling in order to understand the determinants of epizootics. We developed a single population marine infectious disease mode...

This is an abstract from a presentation - there is no publication for this title Oyster reefs provide the structural and ecological foundation for healthy estuaries worldwide. However, centuries of resource extraction, exacerbated by a revolving door of infectious diseases, have pushed these habitats to the brink of functional extinction. The emer...

Recent findings suggest that larvae respond to natural sounds from the reefs, produced by animals feeding, moving and calling each other, swimming actively towards this “chorus” and settling. Moreover, there is evidence that a far greater range of invertebrate taxa than previously thought can respond to acoustic cues. However, although behavior app...

Aquatic disease dynamics consist of complex relationships among hosts and pathogens. The study of the determinants of epizootics, their initiation or termination, together with the prediction of the impact of climate change in the ecology and distribution of pathogens require innovative strategies towards the identification of processes, monitoring...

We herein explore the potential larval dispersal and recruitment patterns of Ruditapes decussatus and Ruditapes philippinarum clams, influenced by larval behavior and hydrodynamics, by means of a particle-tracking model coupled to a hydrodynamic model. The main contribution of this study is that a habitat suitability-based (ENFA, Environmental Nich...

In several estuaries or lagoons of Europe the introduced Manila clam Ruditapes philippinarum has supplanted the native grooved carpet shell clam Ruditapes decussatus by occupying almost entirely its ecological niche and relegating it to restricted areas. However, it is not clear if the nonindigenous clam is the direct responsible of this predominan...

The objective of the thesis is to advance in the understanding of ecological dynamics of the European native grooved carpet shell clam Ruditapes decussatus and the introduced Manila clam Ruditapes philippinarum, in order to support specific conservation strategies and shellfisheries management of these species in large estuaries and, specifically,...

The present study analyzes the weight gain patterns per unit of size and estimates the minimum suitable catch size of two clam species: the carpet shell clam Ruditapes decussatus and the Manila clam Ruditapes philippinarum. For this purpose, data from the two largest estuaries along the northern coast of Spain (Cantabrian Sea) were used. The length...

Knowledge on spatial distribution of commercial species and habitat suitability determinations constitute two basic elements in fisheries management. This information is more relevant in case of introduction of fast-growing species competing with native ones, because of actual risk of dislodgment for the later ones to very restricted areas. Within...

Dispersal of invertebrate larvae is determined by larval swimming behavior, duration of planktonic phases and hydrodynamic regime. This study investigates the potential recruitment patterns of 2 clam species using a bio-physical model. For that purpose, a specific study was carried out in the Bay of Santander (N Spain), a well-mixed shallow water e...

The aim of the present study was to estimate the length-weight relationship of Ruditapes decussatus and Ruditapes phillippinarum. For this purpose, this study was undertaken using data drawn from two estuaries along the coast of Cantabria (N Spain). The length-weight relationship of both species was estimated for both estuaries, using two models: a...