scholarly journals Hypothesis about a cause of mass mortality of pen shell in Ariake bay using metabolism model

2013 ◽  
Vol 69 (2) ◽  
pp. I_1186-I_1190
Author(s):  
Shinsuke TOSHA ◽  
Tsukasa YOSHIDA ◽  
Yoshiharu NAKAMURA ◽  
Yusuke NAKATANI ◽  
Shigeru TABETA ◽  
...  
Keyword(s):  
Mass Mortality ◽  
Ariake Bay ◽  
Pen Shell ◽  
Metabolism Model

scholarly journals Tracking a mass mortality outbreak of pen shell Pinna nobilis populations: A collaborative effort of scientists and citizens

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Miguel Cabanellas-Reboredo ◽  
Maite Vázquez-Luis ◽  
Baptiste Mourre ◽  
Elvira Álvarez ◽  
Salud Deudero ◽  
...  
Keyword(s):  
Additive Model ◽  
Mass Mortality ◽  
Salinity Range ◽  
Pinna Nobilis ◽  
Mass Mortality Event ◽  
Virtual Particles ◽  
Management Measures ◽  
Pen Shell ◽  
The Mediterranean

Abstract 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.

scholarly journals Mass mortality of pen shell Atrina maura (Bivalvia: Pinnidae) due to abrupt population increase of tunicate (Distaplia sp.) in a subtropical bay, Mexico

2021 ◽  
pp. 107493
Author(s):  
Betzabé Moreno-Dávila ◽  
Jaime Gómez-Gutiérrez ◽  
Teresa Alcoverro ◽  
Silvia Ramírez-Luna ◽  
Carlos Sánchez ◽  
...  
Keyword(s):  
Mass Mortality ◽  
Population Increase ◽  
Pen Shell

scholarly journals Epidemiology of Noble Pen Shell (Pinna nobilis L. 1758) Mass Mortality Events in Adriatic Sea Is Characterised with Rapid Spreading and Acute Disease Progression

Pathogens ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 776 ◽  
Author(s):  
Tomislav Šarić ◽  
Ivan Župan ◽  
Serena Aceto ◽  
Grazia Villari ◽  
Dušan Palić ◽  
...  
Keyword(s):  
Lower Risk ◽  
Clinical Symptoms ◽  
Pathogen Transmission ◽  
Mass Mortality ◽  
Sample Collection ◽  
Active Recovery ◽  
Time Dynamics ◽  
Pinna Nobilis ◽  
Pen Shell ◽  
Sea Currents

From May to October 2019, multiple mass mortality events (MMEs) of Pinna nobilis were observed along Croatian coastline starting from the south-east and rapidly progressing in north-western direction. Time dynamics of the MMEs closely followed general speed and direction patterns of surface sea-currents, advancing approximately 350 km in less than 3 months. Surveillance, clinical evaluation, and sample collection were performed on multiple sites with various degrees of mortality rates. Moribund P. nobilis individuals were collected and subjected to pathological, molecular, and microscopical investigation. Affected animals were positive for Mycobacterium in 70% of the individuals, and Haplosporidium pinnae was present in 58% of the cases. Observed pathological lesions were most severe where concurrent presence of both pathogens was confirmed (in 45.8% of moribund individuals). Moderate to strong lesions were observed in animals positive for Mycobacterium only (25% of cases), and lesions were absent or minor to moderate when only H. pinnae was confirmed (16% of cases). Considering the rapid and severe spread of the MMEs, the areas less exposed to major sea currents appeared to be at lower risk of pathogen transmission. Surveillance activities along the Croatian coastline identified several P. nobilis populations in such “lower risk” areas without apparent mortality or clinical symptoms. Such areas are of particular interest as source of potentially healthy individuals to support active recovery actions.

scholarly journals Impact of Organic Micropollutants Causing Mass Mortality of the Clams (Mactra aequisulcata) Due to Charactersitic Distribution at Karachi Coast, Pakistan

2020 ◽  
Vol 63 (3) ◽  
pp. 148-156
Author(s):  
Safia Khanam ◽  
Alia Bano Munshi ◽  
Hina Ahsan ◽  
Razia Begum
Keyword(s):  
Polychlorinated Biphenyls ◽  
Mass Mortality ◽  
Heptachlor Epoxide ◽  
Portunus Pelagicus ◽  
Marine Fauna ◽  
Fish Samples ◽  
Pen Shell ◽  
Wet Weight ◽  
Dichloro Diphenyl Trichloroethane ◽  
Atrina Pectinata

  Mass mortality of bivalve clams along with some other marine fauna was observed during the month of May 2016, mainly consisting of the clams (Mactra aequisulcata) of family Veneridae surfaced over the Clifton coast. The occurrence of mass mortality of the venerid clams Mactra aequisulcata and other marine life has been studied due to the toxicity of chlorinated hydrocarbons (DDTs, HCHs, hexa chloro benzene (HCB), chlordane, dieldrin (4-chlorophenyl), methanol (TCPMOH) and heptachlor epoxide and polychlorinated biphenyls (PCBs). Significant compositional characteristics of PCBs and DDTs were found in all dead clams and other fauna including fish (Johnius carutta), crabs (Portunus pelagicus), gastropods (Babylonia spirata), bivalves (Anadara antiquata), (Mactra aequisulcata) and the pen shell (Atrina pectinata) from Karachi coast, Pakistan. Mean concentrations (ranges) of organochlorine pesticides (OCPs) in crab (Portunus pelagicus) and fish samples were 1.1 (<0.01-1.5), 0.22 (<0.01-1.1) and 0.14 (<0.01-1.3) /µg/g. Those in, bivalves (Anadara antiquata) and pen shell (Atrina pectinata), clams (Mactra aequisulcata) were 0.09 (<0.02-1.2), 0.22 (<0.02-1.3) /µg and 0.13 (<0.01-0.27), respectively. The heptachlor epoxide was found in highest concentration in clam samples (25.00 ± 30.92) µg/g, (wet weight) however, in bivalves, (2.30 µg/g, (wet weight), which were higher than those in other gastropods. Polychlorinated biphenyls (PCBs) concentrations were also measured in the same samples of gastropods (Babylonia spirata), fish (Johnius carutta), crab (Portunus pelagicus), clams (Mactra aequisulcata), bivalves (Anadara antiquata) and the pen shell (Atrina pectinata) to determine the possible cause of mass mortality. The DDT to metabolites (DDD & DDE) concentration ratios exceeded upto 1.0 in the sessile fauna that is clams (Mactra aequisulcata) and the pen shell (Atrina pectinata) from Karachi coast. These organisms also exhibited dichloro diphenyl trichloroethane (DDT) inputs, whereas dichloro diphenyl trichloroethane (DDD) was found to be in degraded component and PCBs were generally in low concentrations. The concentrations of DDTs were higher than the ERL guidelines in the coastal areas of Karachi, suggesting that there is potential of ecological risk present in the prevailing environment.    

Environmental effect on diet, fecundity and condition of an endangered fishNeosalanx reganius(Osmeriformes) in the Chikugo Estuary, in the upper Ariake Bay, Japan

2006 ◽  
Vol 19 (1) ◽  
pp. 59-68 ◽  
Author(s):  
Md. Shahidul Islam ◽  
Manabu Hibino ◽  
Taro Ohta ◽  
Kouji Nakayama ◽  
Masaru Tanaka
Keyword(s):  
Environmental Effect ◽  
Ariake Bay

scholarly journals Nitrogen enrichment in macroalgae following mass coral mortality

Coral Reefs ◽  
2021 ◽  
Author(s):  
Eleanor J. Vaughan ◽  
Shaun K. Wilson ◽  
Samantha J. Howlett ◽  
Valeriano Parravicini ◽  
Gareth J. Williams ◽  
...  
Keyword(s):  
Coral Reefs ◽  
Coral Cover ◽  
Strong Association ◽  
French Polynesia ◽  
Mass Mortality ◽  
Transplant Experiment ◽  
Bleaching Event ◽  
Coral Mortality ◽  
Absolute Increase ◽  
Inorganic Matter

AbstractScleractinian corals are engineers on coral reefs that provide both structural complexity as habitat and sustenance for other reef-associated organisms via the release of organic and inorganic matter. However, coral reefs are facing multiple pressures from climate change and other stressors, which can result in mass coral bleaching and mortality events. Mass mortality of corals results in enhanced release of organic matter, which can cause significant alterations to reef biochemical and recycling processes. There is little known about how long these nutrients are retained within the system, for instance, within the tissues of other benthic organisms. We investigated changes in nitrogen isotopic signatures (δ15N) of macroalgal tissues (a) ~ 1 year after a bleaching event in the Seychelles and (b) ~ 3 months after the peak of a bleaching event in Mo’orea, French Polynesia. In the Seychelles, there was a strong association between absolute loss in both total coral cover and branching coral cover and absolute increase in macroalgal δ15N between 2014 and 2017 (adjusted r2 = 0.79, p = 0.004 and adjusted r2 = 0.86, p = 0.002, respectively). In Mo’orea, a short-term transplant experiment found a significant increase in δ15N in Sargassum mangarevense after specimens were deployed on a reef with high coral mortality for ~ 3 weeks (p < 0.05). We suggest that coral-derived nutrients can be retained within reef nutrient cycles, and that this can affect other reef-associated organisms over both short- and long-term periods, especially opportunistic species such as macroalgae. These species could therefore proliferate on reefs that have experienced mass mortality events, because they have been provided with both space and nutrient subsidies by the death and decay of corals.

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