Consulta: subjectFacets:"Mass mortality"
Registros recuperados: 7
Data/hora: 01/06/2024 04:55:02

Understanding consequences of adaptive monitoring protocols on data consistency: application to the monitoring of giant clam densities impacted by massive mortalities in Tuamotu atolls, French Polynesia
Provedor de dados: 5
Autores: Georget, Stephane; Van Wynsberge, Simon; Andrefouet, Serge.
During long-term monitoring, protocols suitable in the initial context may have to change afterward because of unforeseen events. The outcome for management can be important if the consequences of changing protocols are not understood. In Tuamotu Archipelago atolls, French Polynesia, the density of giant clams (Tridacna maxima) has been monitored for 12years, but massive mortalities and collapsing densities forced to shift from a line-intercept transects and quadrats (LIT-Q) method to a belt-transect (BT) method. We investigated with a simulation approach the conditions (density, size structure, aggregation of giant clam populations) under which the two methods provided different results. A statistical model relating the BT density to the LIT-Q density was...
Tipo: Text
Palavras-chave: Belt-transect; Ecological monitoring; Fishery; Line-intersect transects; Mass mortality; Quadrats; Sampling methods; Time series; Tridacna maxima.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00516/62717/69556.pdf

Effet de traitements thermiques sur la résistance du naissain d’huître creuse au phénomène de mortalité massive - THERMARES
Provedor de dados: 5
Autores: Pernet, Fabrice; Petton, Bruno; Tamayo, David.
L’objectif de cette étude vise à déterminer l’effet de basses températures (10°C et 13°C) pendant des durées variables (0 et 80 jours) sur la survie du naissain d’huîtres creuses préalablement infecté suite à une exposition en rade de Brest pendant 5 ou 8 jours.  Le naissain d’huître creuse préalablement infecté par OsHV-1 µvar par exposition en milieu naturel pendant 5 d ou 8 d, puis transféré à basse température (10°C ou 13°C) pendant 5 à 80 d, présente des mortalités plus faibles et plus tardives que les animaux témoins en laboratoire. La réduction des mortalités observée dans le naissain exposé à basse température coïncide avec une diminution progressive des concentrations d’ADN appartenant à OsHV-1 dans les tissus, au point de devenir non-détecté ou...
Tipo: Text
Palavras-chave: Huître creuse; Naissain; Mortalité massive; OsHV-1 μvar; Température; Pacific oyster; Mass mortality; OsHV-1 μvar; Spat; Temperature.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00210/32135/30592.pdf

Comparative study of bactrial infections responsible for mass mortality in penaeid shrimp hatcheries of the Pacific zone
Provedor de dados: 5
Autores: Le Groumellec, M.; Haffner, Philippe; Martin, B.; Martin, C.
Mass mortality associated with luminescence has been dbserved in sorne Thai and Ecuadorian penaeid shrimp hatcheries in recent years. Samples collected from hatcheries in these two different areas revealed luminescent sucrose-negative Vibrio strains in larVal rearing tanks where mortality occurred. Pathogenicity trials were carried out to identify the causative agents of mortality and to study the course of infection . . Results showed that strains isolated from Thai hatclleries were more virulent than Ecuadorian strains when tested on different larval stages of Penaeus monodon. The virulence of these strains was also estimated. Trials on other species ofpenaeid shrimp demonstrated the specifie action of Thai strains. Drug sensitivity patterns revealed a...
Tipo: Text
Palavras-chave: Mass mortality; Bacterial; Vibrio; Hatcheries; Penaeus monodon; Shrimp.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/1993/acte-6100.PDF

A hemocyte gene expression signature correlated with predictive capacity of oysters to survive Vibrio infections
Provedor de dados: 5
Autores: Rosa, Rafael Diego; De Lorgeril, Julien; Tailliez, Patrick; Bruno, Roman; Piquemal, David; Bachere, Evelyne.
Background: The complex balance between environmental and host factors is an important determinant of susceptibility to infection. Disturbances of this equilibrium may result in multifactorial diseases as illustrated by the summer mortality syndrome, a worldwide and complex phenomenon that affects the oysters, Crassostrea gigas. The summer mortality syndrome reveals a physiological intolerance making this oyster species susceptible to diseases. Exploration of genetic basis governing the oyster resistance or susceptibility to infections is thus a major goal for understanding field mortality events. In this context, we used high-throughput genomic approaches to identify genetic traits that may characterize inherent survival capacities in C. gigas. Results:...
Tipo: Text
Palavras-chave: Marine invertebrate; Mollusk bivalve; Mass mortality; Transcriptome-wide analysis; Digital gene expression; Microfluidic qPCR; Survival signature; Polymorphism; Gene copy number; Survival predictive biomarkers.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00095/20624/18262.pdf

The French Polynesian experience (Pearl oyster management, a manual)
Provedor de dados: 5
Autores: Berthe, Franck; Prou, Jean.
French Polynesia is currently the world's largest producer of cultured black pearls with exports worth U5$150 millions annually. The activity has become of prime socioeconomic importance the archipelagos with strong support and control of the government. In the mid-1980s, mass mortality of the black-lipped pearl oyster, Pinctada margarltlfera, has occurred in several atolls and challenged the development of pearl farming activity. Consequent studies and surveys have described several pathological conditions. None of those is considered to pose significant threat to the industry. However, they are monitored by a surveillance program in order to prevent and control emerging diseases. The government of French Polynesia has developed efforts to maintain high...
Tipo: Text
Palavras-chave: Health management; Pinctada margaritifera; French Polynesia; Pathogens; Mass mortality.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3703.PDF

Size‐based survival of cultured Argopecten purpuratus (L, 1819) under severe hypoxia
Provedor de dados: 5
Autores: Cueto‐vega, Rosa; Flye‐sainte‐marie, Jonathan; Aguirre‐velarde, Arturo; Jean, Frederic; Gil‐kodaka, Patricia; Thouzeau, Gerard.
During recent years, mass mortalities of cultured scallops became more frequent in Peruvian bays. One of the main drivers related to these mortalities was hypoxic events. This study was designed to understand the hypoxia phenomenon in these bays and to assess how the Peruvian scallop, Argopecten purpuratus, can cope with reduced oxygen levels in seawater based on individual size. First, we analyzed the relationships between dissolved oxygen saturation and other environmental parameters (the Coastal El Niño Index, temperature, salinity and pH) in bottom seawater, the frequency and intensity of hypoxic events in two main culture areas (Sechura and Paracas Bays), and their relationship with scallop mass mortalities. Then, we performed experiments with two...
Tipo: Text
Palavras-chave: Argopecten purpuratus; Lt50; Mass mortality; Severe hypoxia; Size effect.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00692/80410/83521.pdf

交通事故によるベニヒワの大量死
Provedor de dados: 19
Autores: 柳川, 久; 筒渕, 美幸; Yanagawa, Hisashi; Tsutsubuchi, Miyuki.
Palavras-chave: 交通事故; 死因; ベニヒワ; Carduelis flammea; Collisions with vehicle; Mass mortality.
Ano: 1999
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2298