Data/hora: 06/06/2024 02:40:53

Provedor de dados: 	5	
País: 	France	
Título: 	Hypotaurine and thiotaurine as indicators of sulfide exposure in bivalves and vestimentiferans from hydrothermal vents and cold seeps	
Autores: 	Brand, G; Horak, R; Le Bris, Nadine; Goffredi, S; Carney, S; Govenar, B; Yancey, P.	
Data: 	2007-03	
Ano: 	2007	
Palavras-chave: 	Vestimentiferan; Vesicomyid; Thiotaurine; Taurine; Hypotaurine; Bathymodiolin.	
Resumo: 	Vesicomyid clams, vestimentiferans, and some bathymodiolin mussels from hydrothermal vents and cold seeps possess thiotrophic endosymbionts, high levels of hypotaurine and, in tissues with symbionts, thiotaurine. The latter, a product of hypotaurine and sulfide, may store and/or transport sulfide non-toxically, and the ratio to hypotaurine plus thiotauririe (Th/[H + Th]) may reflect an animal's sulfide exposure. To test this, we analyzed seep and vent animals with in situ sulfide measurements. Calyptogena kilmeri clams occur at high-sulfide seeps in Monterey Canyon, while C. (Vesicomya) pacifica clams occur at seeps with lower levels but take up and metabolize sulfide more effectively. From one seep where they co-occur, both had gill thiotaurine contents at 22-25 mmol kg(-1) wet mass, and while C. (V.) pacifica had a higher blood sulfide level, it had a lower Th/[H + Th] (0.39) than C. kilmeri (0.63). However, these same species from different seeps with lower sulfide exposures had lower ratios. Bathymodiolus thermophilus [East Pacific Rise (EPR 9 degrees 50' N)] from high-(84 mu M) and a low-(7 mu M) sulfide vents had gill ratios of 0.40 and 0.12, respectively. Trophosomes of Riftia pachyptila (EPR 9 degrees 50' N) from medium-(33 mu M) and low-(4 mu M) sulfide vents had ratios of 0.23 and 0.20, respectively (not significantly different). Ridgeia piscesae vestimentiferans (Juan de Fuca Ridge) have very different phenotypes at high- and low-sulfide sites, and their trophosomes had the greatest differences: 0.81 and 0.04 ratios from high- and low-sulfide sites, respectively. Thus Th/ [H + Th] may indicate sulfide exposure levels within species, but not in interspecies comparisons, possibly due to phylogenetic and metabolic differences. Total H + Th was constant within each species (except in R. piscesae); the sum may indicate the maximum potential sulfide load that a species faces.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2007/publication-3563.pdf

DOI:10.1111/j.1439-0485.2006.00113.x	
Editor: 	Blackwell science	
Relação: 	http://archimer.ifremer.fr/doc/00000/3563/	
Formato: 	application/pdf	
Fonte: 	Marine Ecology (0173-9565) (Blackwell science), 2007-03 , Vol. 28 , N. 1 , P. 208-218	
Fonte: 	2007 Blackwell Publishing, Inc.