Consulta: creatorFacets:"Koua, Manaarii Sham"
Registros recuperados: 4
Data/hora: 11/06/2024 04:40:36

Toxic effects of leachates from plastic pearl-farming gear on embryo-larval development in the pearl oyster Pinctada margaritifera
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gardon, Tony; Huvet, Arnaud; Paul-pont, Ika; Cassone, Anne-laure; Koua, Manaarii Sham; Soyez, Claude; Jezequel, Ronan; Receveur, Justine; Le Moullac, Gilles.
Pearl-farming leads to significant plastic pollution in French Polynesia (FP) as the end of life of most farming gear is currently poorly managed. Plastic debris released into the aquatic environment accumulates, with potentially detrimental effects on the lagoon ecosystem and pearl oyster Pinctada margaritifera, a species of ecological, commercial and social value. Here, we tested the effects of leachates from new (N) and aged (A) plastic pearl-farming gear (spat collector and synthetic rope) obtained after 24 h and 120 h incubation, on the embryo-larval development of the pearl oyster using an in-vitro assay. Embryos were exposed for 24 h and 48 h to a negative control (0) and the leachate from 0.1, 1, 10 and 100 g of plastic. L−1. After 24 h exposure to...
Tipo: Text
Palavras-chave: Aquaculture; Synthetic materials; Hazardous chemicals; Toxicity; Marine bivalve; Early development.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00627/73917/73257.pdf

Influence of farmed pearl oysters and associated biofouling communities on nutrient regeneration in lagoons of French Polynesia
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Lacoste, Elise; Gueguen, Yannick; Le Moullac, Gilles; Koua, Manaarii Sham; Gaertner-mazouni, Nabila.
Bivalve cultivation can significantly contribute to nutrient cycling in semi-enclosed ecosystems. We investigated the influence of suspended pearl oyster culture on nutrient regeneration in the water column of 3 oligotrophic lagoons in French Polynesia. The aim of this first study performed in a tropical area was to assess the seasonal variability of nutrient fluxes and to quantify the contribution of biofouling communities. In situ metabolic enclosure systems were used to measure nutrient uptake or release by ‘cultivation units’ (i.e. 4 pearl oysters with or without associated biofouling). In all 3 study lagoons (Tahiti, Mangareva, Ahe), nutrient fluxes produced by pearl oyster and associated biofouling communities (CR units) were 4- to 6-fold higher than...
Tipo: Text
Palavras-chave: Pearl oysters; Biofouling; Nutrient flux; Aquaculture impact.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00201/31193/29592.pdf

Is pearl colour produced from Pinctada margaritifera predictable through shell phenotypes and rearing environments selections?
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ky, Chin-long; Le Pabic, Lore; Koua, Manaarii Sham; Molinari, Nicolas; Nakasai, Seiji; Devaux, Dominique.
The black-lipped pearl oyster, Pinctada margaritifera is the most important farmed mollusc species in French Polynesia. Donor oyster selection among wild P. margaritifera individuals, chosen according to their inner shell colour, makes it possible to obtain the broadest range of cultured pearl colours of any species. This study demonstrates the relative influence of using black [B] or red [R] outer shell phenotypes, combined with green [G] or yellow [Y] inner shell phenotypes, on pearl darkness level, colour categories and lustre. A large scale grafting experiment was designed and carried out over five grow-out locations, covering three archipelagos: Tuamotus, Society and Gambier. Results revealed that the [B + G] phenotypes may be used as donors to...
Tipo: Text
Palavras-chave: Pearl oyster; Pinctada margaritifera; Shell colour phenotype; Pearl colour; Environment.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00285/39637/38129.pdf

Donor effect on cultured pearl nacre development and shell matrix gene expression in Pinctada margaritifera reared in different field sites
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ky, Chin-long; Broustal, Floriane; Koua, Manaarii Sham; Quillien, Virgile; Beliaeff, Benoit.
Understanding the respective roles played by donor and recipient pearl oysters in pearl quality determination in relation to the environment is a challenge for the pearl industry. In most Pinctada species, pearl size is mainly related to recipient oyster growth performance, but also relies to some extent on the biomineralisation activity of the pearl sac, a tissue that originates from the donor oyster mantle. We examined donor effect on pearl size in response to culture in the lagoons on Arutua and Apataki atolls. Overall nacre weight and thickness were greater in Arutua than in Apataki, but sensitivity to the environment differed between donors. Some donors were associated with significantly heavier and thicker nacre in Arutua (I group), while others had...
Tipo: Text
Palavras-chave: Biomineralisation; Environment; Pearl oyster; Pearl size; Pinctada margaritifera.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00425/53699/54610.pdf