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Salud Deudero - One of the best experts on this subject based on the ideXlab platform.
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recruitment disruption and the role of unaffected populations for potential recovery after the Pinna nobilis mass mortality event
Frontiers in Marine Science, 2020Co-Authors: Diego K Kersting, Baptiste Mourre, Agustin Barrajon, Elvira Alvarez, Maite Vazquezluis, Fatima Zohra Belkhamssa, Tatjana Bakranpetricioli, Carmen Barbera, Emilio Cortes, Salud DeuderoAbstract:A devastating mass mortality event (MME) very likely caused by the protozoan Haplosporidium Pinnae first detected in 2016 in the Western Mediterranean Sea, is pushing the endemic bivalve Pinna nobilis to near extinction. Populations recovery, if possible, will rely on larval dispersal from unaffected sites and potential recolonization through recruitment of resistant juveniles. To assess the impact of the MME on the species’ larval recruitment, an unprecedented network of larval collector stations was implemented over several thousands of kilometers along the Western Mediterranean coasts during the three years after the onset of the MME. The findings of this network showed a generalized disruption in recruitment with dramatic consequences for the recovery of the species. However, there were exceptions to this pattern and recruits were recorded in a few sites where the resident population had been decimated. This hints to the importance of unaffected populations as larval exporting sources and the role of oceanographic currents in larval transport in the area, representing a beacon of hope in the current extremely worrying scenario for this emblematic species.
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tracking a mass mortality outbreak of pen shell Pinna nobilis populations a collaborative effort of scientists and citizens
Scientific Reports, 2019Co-Authors: Miguel Cabanellasreboredo, Baptiste Mourre, Agustin Barrajon, Elvira Alvarez, Maite Vazquezluis, Piero Addis, Salud Deudero, Enric Ballesteros, Angel Amores, S. CoppaAbstract:A mass mortality event is devastating the populations of the endemic bivalve Pinna nobilis in the Mediterranean Sea from early autumn 2016. A newly described Haplosporidian endoparasite (Haplosporidium Pinnae) is the most probable cause of this ecological catastrophe placing one of the largest bivalves of the world on the brink of extinction. As a pivotal step towards Pinna nobilis conservation, this contribution combines scientists and citizens’ data to address the fast- and vast-dispersion and prevalence outbreaks of the pathogen. Therefore, the potential role of currents on parasite expansion was addressed by means of drift simulations of virtual particles in a high-resolution regional currents model. A generalized additive model was implemented to test if environmental factors could modulate the infection of Pinna nobilis populations. The results strongly suggest that the parasite has probably dispersed regionally by surface currents, and that the disease expression seems to be closely related to temperatures above 13.5 °C and to a salinity range between 36.5–39.7 psu. The most likely spread of the disease along the Mediterranean basin associated with scattered survival spots and very few survivors (potentially resistant individuals), point to a challenging scenario for conservation of the emblematic Pinna nobilis, which will require fast and strategic management measures and should make use of the essential role citizen science projects can play.
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Haplosporidium Pinnae sp. nov., a haplosporidan parasite associated with mass mortalities of the fan mussel, Pinna nobilis, in the Western Mediterranean Sea.
Journal of invertebrate pathology, 2018Co-Authors: Gaetano Catanese, Jose Maria Valencia, Elvira Alvarez, Amalia Grau, Salud Deudero, José Rafael García-march, Maite Vázquez-luis, Susana Darriba, María J. Carballal, Antonio VillalbaAbstract:Abstract This study provides morphological and molecular characterization of a new species, Haplosporidium Pinnae), very likely responsible for mass mortality of fan mussels, Pinna nobilis, in the Western Mediterranean Sea. The parasite was found in dead or moribund P. nobilis but did not occur in healthy fan mussels from locations that were not affected by abnormal mortality. Histological examination of infected fan mussels showed uninucleate cells of a haplosporidan parasite throughout the connective tissue and hemolymph sinuses of the visceral mass and binucleate cells and, rarely, multinucleate plasmodia were also detected in the connective tissue. Additionally, stages of sporulation occurred in the epithelium of the host digestive gland tubules. Spores were slightly ellipsoidal with a hinged operculum in one pole. Typical haplosporosomes were not found with TEM but vesicles with two concentric membranes resembling haplosporosomes were abundant in the cytoplasm of the multinucleate plasmodia occurring in host digestive gland tubules. SEM analysis showed multiple structures on the spore surface; some spores had two or four long tape-like filaments attached to the spore wall. Phylogenetic analysis based on the SSU rDNA sequence placed this parasite within a large clade including species of the order Haplosporida, not in the Bonamia/Minchinia subclade or the subclade containing most Haplosporidium species, but within a subclade of Haplosporidium sp. from Penaeus vannamei. Our results suggested that H. Pinnae and the parasite of P. vannamei may represent a distinct new genus within the order Haplosporida.
Elvira Alvarez - One of the best experts on this subject based on the ideXlab platform.
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recruitment disruption and the role of unaffected populations for potential recovery after the Pinna nobilis mass mortality event
Frontiers in Marine Science, 2020Co-Authors: Diego K Kersting, Baptiste Mourre, Agustin Barrajon, Elvira Alvarez, Maite Vazquezluis, Fatima Zohra Belkhamssa, Tatjana Bakranpetricioli, Carmen Barbera, Emilio Cortes, Salud DeuderoAbstract:A devastating mass mortality event (MME) very likely caused by the protozoan Haplosporidium Pinnae first detected in 2016 in the Western Mediterranean Sea, is pushing the endemic bivalve Pinna nobilis to near extinction. Populations recovery, if possible, will rely on larval dispersal from unaffected sites and potential recolonization through recruitment of resistant juveniles. To assess the impact of the MME on the species’ larval recruitment, an unprecedented network of larval collector stations was implemented over several thousands of kilometers along the Western Mediterranean coasts during the three years after the onset of the MME. The findings of this network showed a generalized disruption in recruitment with dramatic consequences for the recovery of the species. However, there were exceptions to this pattern and recruits were recorded in a few sites where the resident population had been decimated. This hints to the importance of unaffected populations as larval exporting sources and the role of oceanographic currents in larval transport in the area, representing a beacon of hope in the current extremely worrying scenario for this emblematic species.
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tracking a mass mortality outbreak of pen shell Pinna nobilis populations a collaborative effort of scientists and citizens
Scientific Reports, 2019Co-Authors: Miguel Cabanellasreboredo, Baptiste Mourre, Agustin Barrajon, Elvira Alvarez, Maite Vazquezluis, Piero Addis, Salud Deudero, Enric Ballesteros, Angel Amores, S. CoppaAbstract:A mass mortality event is devastating the populations of the endemic bivalve Pinna nobilis in the Mediterranean Sea from early autumn 2016. A newly described Haplosporidian endoparasite (Haplosporidium Pinnae) is the most probable cause of this ecological catastrophe placing one of the largest bivalves of the world on the brink of extinction. As a pivotal step towards Pinna nobilis conservation, this contribution combines scientists and citizens’ data to address the fast- and vast-dispersion and prevalence outbreaks of the pathogen. Therefore, the potential role of currents on parasite expansion was addressed by means of drift simulations of virtual particles in a high-resolution regional currents model. A generalized additive model was implemented to test if environmental factors could modulate the infection of Pinna nobilis populations. The results strongly suggest that the parasite has probably dispersed regionally by surface currents, and that the disease expression seems to be closely related to temperatures above 13.5 °C and to a salinity range between 36.5–39.7 psu. The most likely spread of the disease along the Mediterranean basin associated with scattered survival spots and very few survivors (potentially resistant individuals), point to a challenging scenario for conservation of the emblematic Pinna nobilis, which will require fast and strategic management measures and should make use of the essential role citizen science projects can play.
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Haplosporidium Pinnae sp. nov., a haplosporidan parasite associated with mass mortalities of the fan mussel, Pinna nobilis, in the Western Mediterranean Sea.
Journal of invertebrate pathology, 2018Co-Authors: Gaetano Catanese, Jose Maria Valencia, Elvira Alvarez, Amalia Grau, Salud Deudero, José Rafael García-march, Maite Vázquez-luis, Susana Darriba, María J. Carballal, Antonio VillalbaAbstract:Abstract This study provides morphological and molecular characterization of a new species, Haplosporidium Pinnae), very likely responsible for mass mortality of fan mussels, Pinna nobilis, in the Western Mediterranean Sea. The parasite was found in dead or moribund P. nobilis but did not occur in healthy fan mussels from locations that were not affected by abnormal mortality. Histological examination of infected fan mussels showed uninucleate cells of a haplosporidan parasite throughout the connective tissue and hemolymph sinuses of the visceral mass and binucleate cells and, rarely, multinucleate plasmodia were also detected in the connective tissue. Additionally, stages of sporulation occurred in the epithelium of the host digestive gland tubules. Spores were slightly ellipsoidal with a hinged operculum in one pole. Typical haplosporosomes were not found with TEM but vesicles with two concentric membranes resembling haplosporosomes were abundant in the cytoplasm of the multinucleate plasmodia occurring in host digestive gland tubules. SEM analysis showed multiple structures on the spore surface; some spores had two or four long tape-like filaments attached to the spore wall. Phylogenetic analysis based on the SSU rDNA sequence placed this parasite within a large clade including species of the order Haplosporida, not in the Bonamia/Minchinia subclade or the subclade containing most Haplosporidium species, but within a subclade of Haplosporidium sp. from Penaeus vannamei. Our results suggested that H. Pinnae and the parasite of P. vannamei may represent a distinct new genus within the order Haplosporida.
Palomares Sala Idoia - One of the best experts on this subject based on the ideXlab platform.
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Efecto de la temperatura en las tasas de filtración de la nacra (Pinna nobilis)
'Universitat Politecnica de Valencia', 2020Co-Authors: Palomares Sala IdoiaAbstract:[ES] En los últimos años, Pinna nobilis prácticamente se ha extinguido de nuestras costas, con la excepción del Delta del Ebro y el Mar Menor, debido al protozoo Haplosporidium Pinnae, que provoca una enfermedad mortal en las nacras. Para recuperar esta especie, los proyectos de cría en cautividad son una de las mejores opciones. En estos, la alimentación es un aspecto crítico y de los más complicados de ajustar. En el presente trabajo, se estudiaron las tasas de filtración de nacras a 8.5ºC, 14.0ºC y 18.0ºC, suministrando una concentración de 2mm3 de fitoplancton y midiendo su disminución. A 8.5ºC, se obtuvo una tasa de filtración de 3.3±2.4L/h, a 14.0ºC, de 25.4±7.1L/h y a 18.0ºC, de 22.9±9.7L/h. Además, se estudió la respiración, ya que se puede relacionar con la dieta que necesita la nacra, en un recipiente hermético. Se obtuvo que las tasas de respiración fueron de 4.12±0.59mgO2/h para 14.0ºC y de 4.87±0.90mgO2/h para 18.0ºC. Para 14ºC, un individuo de P. nobilis requiere una dieta correspondiente al 1.77%±0.27 de su peso seco y para 18ºC, al 1.83%±0.33. Los resultados obtenidos permiten mejorar las dietas suministradas a nacras en cautividad para desarrollar su maduración.[EN] During the last years, Pinna nobilis has almost become extinct in our coasts, except in Delta del Ebro and Mar Menor, due to the protozoan Haplosporidium Pinnae, which causes a mortal illness to these bivalves. Captive breeding projects are among the best solutions to recover the specie. In them, feeding is a critic aspect and one of the most difficult parameters to adjust. In this project, filtration rates of fan mussels have been studied for three temperatures – 8.5ºC, 14ºC and 18ºC – supplying a concentration of phytoplankton of 2mm3 and measuring its decrease. For 8.5ºC, the filtration rate was 3.3±2.4L/h; for 14.0ºC, it was 25.4±7.1L/h; and for 18ºC, it was 22.9±9.7L/h. Besides, respiration was studied since it can be related to the diet the fan mussel needs. A hermetic bucket was used to do it. Respiration rates were 4.12±0.59mgO2/h for 14ºC and 4.87±0.90mgO2/h for 18.0ºC. The optimal diet was an 1.77±0.27% of dry weight of the fan mussel for 14ºC and 1.83±0.33% for 18.0ºC. The results obtained might improve the diets supplied to captive fan mussels and, develop its maturation.Palomares Sala, I. (2020). Efecto de la temperatura en las tasas de filtración de la nacra (Pinna nobilis). http://hdl.handle.net/10251/152022TFG
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Efecto de la temperatura en las tasas de filtración de la nacra (Pinna nobilis)
'Universitat Politecnica de Valencia', 2020Co-Authors: Palomares Sala IdoiaAbstract:[ES] En los últimos años, Pinna nobilis prácticamente se ha extinguido de nuestras costas, con la excepción del Delta del Ebro y el Mar Menor, debido al protozoo Haplosporidium Pinnae, que provoca una enfermedad mortal en las nacras. Para recuperar esta especie, los proyectos de cría en cautividad son una de las mejores opciones. En estos, la alimentación es un aspecto crítico y de los más complicados de ajustar. En el presente trabajo, se estudiaron las tasas de filtración de nacras a 8.5ºC, 14.0ºC y 18.0ºC, suministrando una concentración de 2mm3 de fitoplancton y midiendo su disminución. A 8.5ºC, se obtuvo una tasa de filtración de 3.3±2.4L/h, a 14.0ºC, de 25.4±7.1L/h y a 18.0ºC, de 22.9±9.7L/h. Además, se estudió la respiración, ya que se puede relacionar con la dieta que necesita la nacra, en un recipiente hermético. Se obtuvo que las tasas de respiración fueron de 4.12±0.59mgO2/h para 14.0ºC y de 4.87±0.90mgO2/h para 18.0ºC. Para 14ºC, un individuo de P. nobilis requiere una dieta correspondiente al 1.77%±0.27 de su peso seco y para 18ºC, al 1.83%±0.33. Los resultados obtenidos permiten mejorar las dietas suministradas a nacras en cautividad para desarrollar su maduración.[EN] During the last years, Pinna nobilis has almost become extinct in our coasts, except in Delta del Ebro and Mar Menor, due to the protozoan Haplosporidium Pinnae, which causes a mortal illness to these bivalves. Captive breeding projects are among the best solutions to recover the specie. In them, feeding is a critic aspect and one of the most difficult parameters to adjust. In this project, filtration rates of fan mussels have been studied for three temperatures – 8.5ºC, 14ºC and 18ºC – supplying a concentration of phytoplankton of 2mm3 and measuring its decrease. For 8.5ºC, the filtration rate was 3.3±2.4L/h; for 14.0ºC, it was 25.4±7.1L/h; and for 18ºC, it was 22.9±9.7L/h. Besides, respiration was studied since it can be related to the diet the fan mussel needs. A hermetic bucket was used to do it. Respiration rates were 4.12±0.59mgO2/h for 14ºC and 4.87±0.90mgO2/h for 18.0ºC. The optimal diet was an 1.77±0.27% of dry weight of the fan mussel for 14ºC and 1.83±0.33% for 18.0ºC. The results obtained might improve the diets supplied to captive fan mussels and, develop its maturation.Palomares Sala, I. (2020). Efecto de la temperatura en las tasas de filtración de la nacra (Pinna nobilis). Universitat Politècnica de València. http://hdl.handle.net/10251/152022TFG
S. Coppa - One of the best experts on this subject based on the ideXlab platform.
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tracking a mass mortality outbreak of pen shell Pinna nobilis populations a collaborative effort of scientists and citizens
Scientific Reports, 2019Co-Authors: Miguel Cabanellasreboredo, Baptiste Mourre, Agustin Barrajon, Elvira Alvarez, Maite Vazquezluis, Piero Addis, Salud Deudero, Enric Ballesteros, Angel Amores, S. CoppaAbstract:A mass mortality event is devastating the populations of the endemic bivalve Pinna nobilis in the Mediterranean Sea from early autumn 2016. A newly described Haplosporidian endoparasite (Haplosporidium Pinnae) is the most probable cause of this ecological catastrophe placing one of the largest bivalves of the world on the brink of extinction. As a pivotal step towards Pinna nobilis conservation, this contribution combines scientists and citizens’ data to address the fast- and vast-dispersion and prevalence outbreaks of the pathogen. Therefore, the potential role of currents on parasite expansion was addressed by means of drift simulations of virtual particles in a high-resolution regional currents model. A generalized additive model was implemented to test if environmental factors could modulate the infection of Pinna nobilis populations. The results strongly suggest that the parasite has probably dispersed regionally by surface currents, and that the disease expression seems to be closely related to temperatures above 13.5 °C and to a salinity range between 36.5–39.7 psu. The most likely spread of the disease along the Mediterranean basin associated with scattered survival spots and very few survivors (potentially resistant individuals), point to a challenging scenario for conservation of the emblematic Pinna nobilis, which will require fast and strategic management measures and should make use of the essential role citizen science projects can play.
Domenico Otranto - One of the best experts on this subject based on the ideXlab platform.
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Haplosporidium Pinnae associated with mass mortality in endangered Pinna nobilis (Linnaeus 1758) fan mussels
Journal of invertebrate pathology, 2019Co-Authors: Rossella Panarese, Perla Tedesco, Giovanni Chimienti, Maria Stefania Latrofa, Francesco Quaglio, Giuseppe Passantino, Canio Buonavoglia, Andrea Gustinelli, Angelo Tursi, Domenico OtrantoAbstract:Abstract The fan mussel, Pinna nobilis (Linnaeus 1758), is an endemic bivalve of the Mediterranean basin, protected by international legislation as an endangered species. In the early summer of 2018, a mass mortality event (MME) of P. nobilis was recorded in the Gulf of Taranto (Southern Italy, Ionian Sea). Moribund specimens of P. nobilis were collected by scuba divers and processed by bacteriological, parasitological, histopathological and molecular analyses to investigate the causes of this MME. Different developmental stages (i.e., plasmodia, spores and sporocysts) of a presumptive haplosporidian parasite were observed during the histological analysis in the epithelium and in the lumen of the digestive tubules, where mature spores occurred either free or in sporocysts. The spores presented an operculum and an ovoid shape measuring 4.4 µm (±0.232) in length and 3.6 µm (±0.233) in width. BLAST analysis of an 18SrRNA sequence revealed a high nucleotide similarity (99%) with the reference sequence of Haplosporidium Pinnae available in GenBank database. Phylogenetic analysis clustered the sequence of the pathogen in a paraphyletic clade with the reference sequence of H. Pinnae, excluding other haplosporidians (i.e., Bonamia and Minchinia genera). Based on data reported, H. Pinnae was the causative agent of MME in the populations of P. nobilis sampled in the Ionian Sea, where the conservation of this endangered species is heavily threatened by such a protozoan infection. Further investigations should contribute to knowledge about the life cycle of H. Pinnae in order to reduce spread of the pathogen and to mitigate the burden of the disease where P. nobilis is facing the risk of extinction.
