Consulta: subjectFacets:"Trophic transfer"
Registros recuperados: 5
Data/hora: 13/06/2024 23:48:15

Ciguatoxin Occurrence in Food-Web Components of a Cuban Coral Reef Ecosystem: Risk-Assessment Implications
Provedor de dados: 5
Autores: Díaz-asencio, Lisbet; Clausing, Rachel J.; Vandersea, Mark; Chamero-lago, Donaida; Gómez-batista, Miguel; Hernández-albernas, Joan I.; Chomérat, Nicolas; Rojas-abrahantes, Gabriel; Litaker, Wayne; Tester, Patricia; Diogène, Jorge; Alonso-hernández, Carlos M.; Dechraoui Bottein, Marie-yasmine.
In Cuba, ciguatera poisoning associated with fish consumption is the most commonly occurring non-bacterial seafood-borne illness. Risk management through fish market regulation has existed in Cuba for decades and consists of bans on selected species above a certain weight; however, the actual occurrence of ciguatoxins (CTXs) in seafood has never been verified. From this food safety risk management perspective, a study site locally known to be at risk for ciguatera was selected. Analysis of the epiphytic dinoflagellate community identified the microalga Gambierdiscus. Gambierdiscus species included six of the seven species known to be present in Cuba (G. caribaeus, G. belizeanus, G. carpenteri, G. carolinianus, G. silvae, and F. ruetzleri). CTX-like...
Tipo: Text
Palavras-chave: Caribbean; Ciguatoxicity; QPCR; Trophic transfer; Ish; Food safety; Food security; Science-based management; Foodborne disease.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00597/70947/69189.pdf

Effect of Azadinium spinosum on the feeding behaviour and azaspiracid accumulation of Mytilus edulis
Provedor de dados: 5
Autores: Jauffrais, Thierry; Contreras, Andrea; Herrenknecht, Christine; Truquet, Philippe; Sechet, Veronique; Tillmann, Urban; Hess, Philipp.
Azadinium spinosum, a small toxic dinoflagellate, was recently isolated and identified as a primary producer of azaspiracid toxins (AZAs). Previous experiments related to AZA accumulation in blue mussels upon direct feeding with A. spinosum revealed increased mussel mortality and had negative effects on the thickness of the digestive gland tubules. Therefore we conducted follow up experiments in order to study effects of A. spinosum on mussel feeding behaviour. Individual assessment of mussel feeding time activity (FTA), clearance rate (CR), filtration rate (TFR), absorption rate (AR), faeces and pseudofaeces production were carried out on mussel fed either toxic (A. spinosum) or non-toxic (Isochrisis aff. galbana (T-Iso)) diets. Furthermore, AZA...
Tipo: Text
Palavras-chave: Bivalve molluscs; Mussel; Ecophysiology; AZA biotransformation; AZA accumulation; Trophic transfer; Dinoflagellate; Azaspiracid.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00090/20174/17832.pdf

Bioaccumulation of Hg, Cu, and Zn in the Azores triple junction hydrotherinal vent fields food web
Provedor de dados: 5
Autores: Colaco, Ana; Bustamante, Paco; Fouquet, Yves; Sarradin, Pierre-marie; Serrao Santos, R.
In this work, mercury (Hg), copper (Cu) and zinc (Zn) concentrations and tissue distribution are determined in seven benthic invertebrates species (the key species) from the Mid Atlantic Ridge (MAR) hydrothermal vent fields. The samples were collected from three hydrothermal vent fields - Menez Gwen, 840 m;, Lucky Strike, 1700 m and Rainbow, 2300 m - near the Azores Triple Junction. These fields are characterized by different depths, geological context and chemical composition of the hydrothermal fluid, particularly the metal content, which is reflected by the metal concentrations in the organisms. Indeed, our results show that organisms from Menez Gwen presented the highest Hg concentrations, while those from Lucky Strike and Rainbow were richer in Cu and...
Tipo: Text
Palavras-chave: Mid Atlantic Ridge; Trophic relations; Trophic transfer; Biomagnification; Vent ecosystems; Heavy metals.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2305.pdf

Experimental evidence of dietary ciguatoxin accumulation in an herbivorous coral reef fish
Provedor de dados: 5
Autores: Clausing, Rachel J.; Losen, Barbara; Oberhaensli, Francois R.; Darius, H. Taiana; Sibat, Manoella; Hess, Philipp; Swarzenski, Peter W.; Chinain, Mireille; Bottein, Marie-yasmine Dechraoui.
Ciguatoxins (CTXs) are potent algal toxins that cause widespread ciguatera poisoning and are found ubiquitously in coral reef food webs. Here we developed an environmentally-relevant, experimental model of CTX trophic transfer involving dietary exposure of herbivorous fish to the CTX-producing microalgae Gambierdiscus polynesiensis. Juvenile Naso brevirostris were fed a gel-food embedded with microalgae for 16 weeks (89 cells g.1 fish daily, 0.4 ¦Ìg CTX3C equiv kg.1 fish). CTXs in muscle tissue were detectable after 2 weeks at levels above the threshold for human intoxication (1.2 ¡À 0.2 ¦Ìg CTX3C equiv kg.1). Although tissue CTX concentrations stabilized after 8 weeks (¡«3 ¡À 0.5 ¦Ìg CTX3C equiv kg.1), muscle toxin burden (total ¦Ìg CTX in muscle tissue)...
Tipo: Text
Palavras-chave: Ciguatoxin; Bioaccumulation; Growth dilution; Trophic transfer; Herbivorous fish; Experimental model.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00442/55339/60476.pdf

Effect of nanoatrazine on the growth of aquatic bioindicators through trophic transfer.
Provedor de dados: 119
Autores: DIONISIO, R. M. F.; CASTANHA, R. F.; VALLIM, J. H.; CASTRO, V. L. S. S. de; JONSSON, C. M.
Abstract: Atrazine is a herbicide that has stood out in recent years for being one of the most commercialized pesticides in the country, being used to control weeds, mainly in corn, sugar cane and sorghum plantations. The nanoencapsulation of this compound has been a strategy to combat environmental impacts in agriculture. The objective of this work is to evaluate the effects of nanoatrazine on the growth of bioindicators through trophic transfer, focusing on harmful effects for species present in aquatic environments. The organisms were exposed to the compounds ATZ-NPZ (atrazine encapsulated in zein nanoparticles) and ATZ-PCL (atrazine encapsulated in poly-epsilon-caprolactone nanoparticles), in the presence and absence of organic matter. No significant...
Tipo: Artigo de periódico
Palavras-chave: Nanoatrazine; Bioindicators; Trophic transfer; Herbicida; Impacto Ambiental; Animal Aquático; Herbicides; Atrazine; Nanoparticles; Environmental impact; Toxicity.
Ano: 2023
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1160083