Juan Antonio Raga

Juan Antonio Raga
University of Valencia | UV · Instituto Cavanilles de Biodiversidad y Biología Evolutiva

Ph D in Biological Sciences

About

515
Publications
96,165
Reads
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8,205
Citations
Citations since 2017
111 Research Items
3535 Citations
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20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600

Publications

Publications (515)
Article
Full-text available
Antarctic minke whales, Balaenoptera bonaerensis, breed in tropical and temperate waters of the Southern Hemisphere in winter and feed in Antarctic grounds in the austral summer. These seasonal migrations could be less defined than those of other whale species, but the evidence is scanty. We quantitatively describe the epibiotic fauna of Antarctic...
Article
The efficient control of harmful parasites, such as monogeneans, is essential in aquaculture and requires an understanding of their transmission in changing environments. This study evaluated the effect of temperature on the transmission and development of Sparicotyle chrysophrii, a pathogenic monogenean commonly found in gilthead seabream (Sparus...
Presentation
The barnacle Xenobalanus globicipitis lives on the fins of at least 40 species of cetaceans. In striped dolphins, it is most abundant on the center and dorsal side of the caudal fin. The central third of the fin seems to generate greater vortical area with lower water velocity, which would favor larval attachment. The greater occurrence on the dors...
Poster
Full-text available
Find the publication, "Epibiotic Fauna on Cetaceans Worldwide: A Systematic Review of Records and Indicator Potential", in the following link: https://www.researchgate.net/publication/362233136_Epibiotic_Fauna_on_Cetaceans_Worldwide_A_Systematic_Review_of_Records_and_Indicator_Potential
Article
Full-text available
Anisakis spp. (Nematoda, Anisakidae) are parasites known by their economic and health impacts, as their L3 larval stages infect a variety of fish species, many of them commercial species, sometimes causing zoonotic episodes due to consumption of raw or undercooked fish. The aim of this study is to determine the infection process and the potential i...
Article
Full-text available
The Cetacean Migration Corridor is an important marine protected area for cetacean species in the Western Mediterranean, and part of its waters constitute the main fishing grounds for the Valencia region (East Spain) fishing fleet. Here we aim to assess the interactions between all active fisheries operating in the waters of the Valencia region and...
Article
Full-text available
The Prestige oil-spill (2002) is one of the major marine accidents resulting in contamination of virtually all types of marine habitat along c.900 km of coastline in the North-East Atlantic. Environmental pollution affects parasite populations and communities, both directly and through effects on intermediate and definitive hosts. However, the effe...
Article
Full-text available
Each individual cetacean is an ecosystem itself, potentially harboring a great variety of animals that travel with it. Despite being often despised or overlooked, many of these epizoites have been proven to be suitable bio-indicators of their cetacean hosts, informing on health status, social interactions, migration patterns, population structure o...
Article
Transmission and infection strategies are critical for completing the life cycles of trematode parasites, which are characterized by complex life cycles involving multiple hosts and stages. Transmission between the first and second intermediate hosts typically relies on cercariae, a free-swimming larval stage that displays a series of behaviors to...
Article
Full-text available
The microcotylid Sciaenacotyle pancerii is a pathogenic monogenean infecting Argyrosomus regius , a candidate for species diversification in the Mediterranean aquaculture. Life-history stages of S. pancerii commonly co-occur in field infections, but to date, morphological data have only been provided for oncomiracidia and adults although identifyin...
Article
Full-text available
One of the most promising aquaculture species is the Atlantic bluefin tuna (Thunnus thynnus) with high market value; disease control is crucial to prevent and reduce mortality and monetary losses. Microsporidia (Fungi) are a potential source of damage to bluefin tuna aquaculture. A new microsporidian species is described from farmed bluefin tunas f...
Article
Full-text available
We studied microdebris in three western Mediterranean beaches in East Spain. One of them is urban, while the other two are located in a protected environment. Moreover, one of them is used as hatchery for loggerhead turtles’ (Caretta caretta) sporadic nesting activity. Here, we discuss the amount and type of microdebris in the area in different sea...
Presentation
Full-text available
Las poblaciones de cetáceos del Área Marina Protegida del Corredor de Migración de Cetáceos del Mediterráneo sufren diversas amenazas, entre las que se encuentra la interacción con actividades pesqueras. Para evaluar el impacto de esta amenaza, en 2020 entrevistamos a más del 50% de la flota pesquera activa en los 21 puertos de la Comunidad Valenci...
Presentation
The Antarctic minke whale, Balaenoptera bonaerensis Burmeister, 1867, is believed to migrate seasonally, feeding on krill in Antarctic waters during the austral summer and breeding in warmer Southern Hemisphere waters during the winter. The present review gathers evidence based on sightings (N=104 records), strandings (N=18), acoustics (N=3) and ca...
Presentation
The Antarctic minke whale, Balaenoptera bonaerensis, makes seasonal migrations from low latitudes, where it spends the winter in breeding areas, to the Southern Ocean, where it feeds on krill during the austral summer. The seasonality or intraspecific variation of these migrations is still unknown; in fact, fin whales have been observed in Antarcti...
Poster
Full-text available
The commensal epibiont Xenobalanus globicipitis is found on the trailing edge of the fins of about 40 cetacean species worldwide. The ubiquity and high detectability of this epibiont has allowed for multiple records on swimming, stranded, and captured cetaceans. Also, the study of its biology has provided valuable information of its cetacean hosts....
Article
Full-text available
The genus Cardicola Short, 1953 has the highest number of species within the family Aporocotylidae (Trematoda: Digenea). Five Cardicola species have been reported to date in the Mediterranean Sea, one of them in the gilthead seabream Sparus aurata L. Analyses of infected S. aurata recovered from cultured fish off Sardinia (Italy) and from wild and...
Article
Full-text available
Background Current data about Pseudaliidae show contrasting patterns of host specificity between congeneric species. We investigated how both contact and compatibility between hosts and parasites contributed to the patterns of lungworm infection observed in a community of five species of cetaceans in the western Mediterranean. Methods The lungs of...
Preprint
Full-text available
One of the most promising aquaculture species is the Atlantic bluefin tuna ( Thunnus thynnus ) with high market value; disease control is crucial to prevent and reduce mortality and monetary losses. Microsporidia Balbiani, 1882 (Fungi) are a potential source of damage to bluefin tuna aquaculture. A new microsporidian species is described from farme...
Presentation
Antarctic minke whales, Balaenoptera bonaerensis, typically inhabit waters of the Southern Hemisphere and migrate alone or in small groups to higher latitudes during the austral summer, where they feed on Antarctic krill. We examined the epibiotic macrofauna of 333 Antarctic minkes captured in the Indo-Pacific region of the Antarctic by a Japanese...
Presentation
Xenobalanus globicipitis is an epibiont of cetaceans that typically attaches on the edge of fins. Recent evidence showed that its distribution on the tail flukes of striped dolphins, Stenella coeruleoalba, was non-random; most barnacles occurring on the dorsal side, and the central third, of the trailing edge of the flukes. These patterns were inte...
Article
Full-text available
Ten species of cetaceans coexist in the Mediterranean Sea, one of the richest seas in biodiversity and endemisms worldwide. The conservation status of Mediterranean cetaceans has been a concern for many years, particularly due to increasing anthropogenic threats such as global warming and overfishing. We established the stable isotopic niches of ca...
Article
The causes of cetacean stranding and death along the Catalan coast between 2012 and 2019 were systematically investigated. Necropsies and detailed pathological investigations were performed on 89 well-preserved stranded cetaceans, including 72 striped dolphins Stenella coeruleoalba, 9 Risso’s dolphins Grampus griseus, 5 bottlenose dolphins Tursiops...
Article
Litter is a well-known problem for marine species; however, we still know little about the extent to which they're affected by microplastics. In this study, we analyse the presence of this type of debris in Western Mediterranean striped dolphins' intestinal contents over three decades. Results indicated that frequency was high, as 90.5% of dolphins...
Article
This study assesses microplastic ingestion in Boops boops at different geographical areas in the Mediterranean Sea. A total of 884 fish were caught at 20 coastal sites in Spain, France, Italy and Greece and analyzed using a common methodological protocol. Microplastics were found in 46.8% of the sampled fish, with an average number of items per ind...
Article
Full-text available
Within the cetacean lungworm family Pseudaliidae Raillet & Henry, 1909, the distinction between the two genera of the subfamily Halocercinae Delamure, 1952, i.e. Halocercus Baylis & Daubney, 1925 and Skrjabinalius Delyamure, 1942, is principally based on the structure and shape of the male copulatory bursa. In species of Halocercus, the bursa is un...
Article
Crassicauda spp. (Nematoda) infest the cranial sinuses of several odontocetes, causing diagnostic trabecular osteolytic lesions. We examined skulls of 77 Indian Ocean humpback dolphins Sousa plumbea and 69 Indo-Pacific bottlenose dolphins Tursiops aduncus, caught in bather-protecting nets off KwaZulu-Natal (KZN) from 1970-2017, and skulls of 6 S. p...
Article
We analyzed patterns of aggregation and spatial distribution of the epizoic barnacle Xenobalanus globicipitis on the flukes of Mediterranean striped dolphins, Stenella coeruleoalba, assessing its potential use as an indicator of the host's hydrodynamics based on data from 55 dolphins. Barnacles occurred along the trailing edge with the cirri orient...
Article
Full-text available
The impact of inbreeding on fitness has been widely studied and provides consequential inference about the adaptive potential and the impact on survival for reduced and fragmented natural populations. Correlations between heterozygosity and fitness are common in the literature, but they rarely inform about the likely mechanisms. Here, we investigat...
Article
Full-text available
The impact of inbreeding on fitness has been widely studied and provides consequential inference about adaptive potential and the impact on survival for reduced and fragmented natural populations. Correlations between heterozygosity and fitness are common in the literature, but they rarely inform about the likely mechanisms. Here, we investigate a...
Article
Pollution by marine litter is raising major concerns due to its potential impact on marine biodiversity and, above all, on endangered mega-fauna species, such as cetaceans and sea turtles. The density and distribution of marine litter and mega-fauna have been traditionally monitored through observer-based methods, yet the advent of new technologies...
Article
Full-text available
Background: Microcotyle erythrini van Beneden & Hesse, 1863 (Platyhelminthes: Monogenea) and other closely related species of the genus are often considered as cryptic. Records in hosts other than the type-host with no species confirmation by molecular analyses have contributed to this situation. Methods: Gill parasites of five sparid fishes, Bo...
Article
Pseudaliid lungworms infect the lungs and sinuses of cetaceans. Information on the life cycle and epidemiology of pseudaliids is very scarce and mostly concerns species that infect coastal or inshore cetaceans. Available evidence indicates that some pseudaliids are vertically transmitted to the host, whereas others are acquired via infected prey. W...
Conference Paper
The development of international networks of incubators constitutes a recent phenomenon worldwide aimed to reinforce knowledge transfer and foster efficient entrepreneurship and innovation with a strong sectoral focus. This paper presents an exploratory study about AGROINNCUBA, a network of incubators involving a set of university incubators and sc...
Chapter
Full-text available
The development of international networks of incubators constitutes a recent phenomenon worldwide aimed to reinforce knowledge transfer and foster efficient entrepreneurship and innovation with a strong sectoral focus. This paper presents an exploratory study about AGROINNCUBA, a network of incubators involving a set of university incubators and sc...
Article
Full-text available
Background: Despite their complex life-cycles involving various types of hosts and free-living stages, digenean trematodes are becoming recurrent model systems. The infection and penetration strategy of the larval stages, i.e. cercariae, into the fish host is poorly understood and information regarding their entry portals is not well-known for mos...
Article
In this study, 542 individual fish from 20 species from the Patagonian continental shelf of Argentina were examined for acanthocephalans. A total of 1,547 acanthocephalans belonging to 5 species were collected from 18 species of fish. Adult forms were represented by 2 species: Aspersentis johni ( Baylis, 1929 ) (Heteracanthocephalidae) from longtai...
Article
Full-text available
Acanthocephalans display a two-host life cycle that involves arthropods as intermediate hosts and vertebrates as definitive hosts. Some species also use paratenic hosts to bridge the trophic gap between both obligatory hosts. However, the relative role of these paratenic hosts in the transmission to definitive hosts has seldom been assessed quantit...
Article
The presence of marine litter is a complex, yet persistent, threat to the health and biodiversity of the marine environment, and plastic is the most abundant, and ubiquitous type of marine litter. To monitor the level of plastic waste in an area, and the prospect of it entering the food chain, bioindicator species are used extensively throughout No...
Article
The taxonomy of the genus Diplectanum has been exclusively based on morphological features, with 28 nominal species parasitic on perciform fishes recognised. We used molecular data, to our knowledge for the first time, to evaluate the taxonomic framework of Diplectanum, infer the relationships amongst species attributed to this genus, re-assess the...
Book
Full-text available
El presente trabajo resultó de una investigación aplicada originada en el interés em retractarse un estudio de caso con la Red Iberoamericana de Incubadoras y Parques Científicos / Tecnológicos del Sistema Agroalimentario denominada AGROINNCUBA. Esta red, apoyada por el Programa CTYED, reúne incubadoras de empresas y parques científicos / tecnológi...
Article
Full-text available
Background Functional inference on the attachment of acanthocephalans has generally been drawn directly from morphology. However, performance of structures is often non-intuitive and context-dependent, thus performance analysis should be included whenever possible to improve functional interpretation. In acanthocephalans, performance analysis of at...
Book
Full-text available
A Rede AGROINNCUBA nasceu observando-se a necessidade de desenvolvimento de negócios inovadores e do suporte às empresas surgidas no segmento do agronegócio em diferentes países. Nesse sentido, formou-se uma rede de incubadoras de empresas do segmento agroalimentar, coordenada pelo Parque Científico da Universidade de Valência (PCUV)/Espanha e com...
Article
Full-text available
Background: Evidence concerning the environmental influence on monogenean transmission and infection processes is widely accepted, although only the effects of a limited number of abiotic factors on particular monogenean species have been explored. The current context of climate change calls for further research both on this subject, and also that...
Article
Anthropogenic marine debris is one of the major worldwide threats to marine ecosystems. The EU Marine Strategy Framework Directive (MSFD) has established a protocol for data collection on marine debris from the gut contents of the loggerhead sea turtle (Caretta caretta), and for determining assessment values of plastics for Good Environmental Statu...
Conference Paper
Full-text available
We investigated Heterozygosity Fitness Correlations (HFC) for a marine mammal known to be subject to epizootic episodes, the striped dolphin (Stenella coeruleoalba). Dolphins included in the study varied with respect to their parasite burden of a highly pathogenic lung nematode (Skrjabinalius guevarai). Genetic diversity assessed for nuclear SNP lo...