The gill symbiont of the hydrothermal vent mussel Bathymodiolus thermophilus is a psychrophilic, chemoautotrophic, sulfur bacterium

1995 ◽  
Vol 121 (3) ◽  
pp. 487-495 ◽  
Author(s):  
D. C. Nelson ◽  
K. D. Hagen ◽  
D. B. Edwards
Keyword(s):  
Hydrothermal Vent ◽  
Bathymodiolus Thermophilus

Ultrastructural characteristics of spermatogenesis in three species of deep-sea hydrothermal vent mytilids

1997 ◽  
Vol 75 (2) ◽  
pp. 308-316 ◽  
Author(s):  
Marcel Le Pennec ◽  
Peter G. Beninger
Keyword(s):  
Deep Sea ◽  
Hydrothermal Vent ◽  
The North ◽  
Male Gametes ◽  
Bathymodiolus Thermophilus ◽  
Nutritional Biology ◽  
Protandric Hermaphroditism ◽  
Mid Atlantic Ridge ◽  
Ultrastructural Characteristics ◽  
Species Specific

To enhance our understanding of the reproductive biology of deep-sea hydrothermal vent mytilids, the histology of the male gonad and the ultrastructure of its gametes were studied in Bathymodiolus thermophilus, B. puteoserpentis, and B. elongatus. Specimens of B. thermophilus were collected at the 13°N site on the East Pacific ridge, while B. puteoserpentis were sampled from the Snake Pit site of the mid-Atlantic ridge and B. elongatus were obtained from the North Fiji Basin. Gonad histology conformed to the typical bivalve profile; the differences in the proportions of acinal and interacinal tissue, as well as differences in acinal fullness in B. puteoserpentis, indicate that gametogenesis is discontinuous in these deep-sea mytilids. Evidence of protandric hermaphroditism was observed in B. elongatus, which exhibited acini containing both maturing and residual male gametes and immature oocytes. The ultrastructural characteristics of the male gametes conform to those described for littoral bivalve species, and the spermatozoon is of the primitive type. No species-specific differences in spermatozoon ultrastructure were discerned. No evidence of bacterial inclusions was found in either the gametes or the associated gonad cells in any of the species examined. The male gametes are thus probably not vectors for the endosymbiotic bacteria that characterize the nutritional biology of the adults in this genus.

Enzymologie du tractus digestif de la modiole hydrothermale Bathymodiolus thermophilus (Mollusque Bivalve)

1992 ◽  
Vol 70 (12) ◽  
pp. 2298-2302 ◽  
Author(s):  
Marcel Le Pennec ◽  
Jean-Claude Martinez ◽  
Anne Donval ◽  
Angèle Herry ◽  
Peter Beninger
Keyword(s):  
Digestive Tract ◽  
Digestive Gland ◽  
Hydrothermal Vent ◽  
Digestive Enzyme ◽  
Nutrient Supply ◽  
Enzyme Assays ◽  
Bathymodiolus Thermophilus ◽  
Intracellular Digestion ◽  
Chemoautotrophic Bacteria ◽  
Structure And Ultrastructure

Although the structure and ultrastructure of the digestive tract of the hydrothermal vent mytilid Bathymodiolus thermophilus conform to those of other bivalves, enzymological data are lacking. To address this question, digestive enzyme assays and histoenzymological tests were performed on different regions of the digestive tract: labial palps, oesophagus, stomach, digestive gland, intestine, and rectum. Carbohydrases, mainly present in the digestive gland and the stomach, were the most active of the 33 enzymes studied. These enzymes would allow substantial digestion of particles from the immediate environment as well as those descending from the photic zone. Acid phosphatases present in all the compartments of the digestive tract indicate intracellular digestion, whereas alkaline phosphatase activity, mainly in the digestive gland and the stomach, demonstrates absorption phenomena. We conclude that, in addition to the nutrient supply furnished by chemoautotrophic bacteria in the gill bacteriocytes, the digestive tract is functional and provides at least some of the nutritive requirements of this species.

Aspects of the feeding biology of the pectinacean Bathypecten vulcani, a peri-hydrothermal vent bivalve

2003 ◽  
Vol 83 (3) ◽  
pp. 479-482 ◽  
Author(s):  
Gaël LE PENNEC ◽  
Peter G. BENINGER ◽  
Marcel LE PENNEC ◽  
Anne DONVAL
Keyword(s):  
Digestive Tract ◽  
Hydrothermal Vent ◽  
Stomach Contents ◽  
Frontal Surface ◽  
Mineral Particles ◽  
East Pacific ◽  
Feeding Biology ◽  
Crystalline Style ◽  
Bathymodiolus Thermophilus ◽  
Cytological Characteristics

The feeding biology of Bathypecten vulcani, a peri-hydrothermal vent pectinacean, was investigated using histological and scanning electron microscope studies of the gills and stomach contents of specimens sampled from the 9° and 13°N sites of the East Pacific Rise. Salient characteristics were compared with those of Bathymodiolus thermophilus from the same and similar habitats. The gills of Bathypecten vulcani displayed heterogeneous organic and mineral particles on their frontal surface. The digestive tract possessed well-developed structures (whose anatomical and cytological characteristics indicated full functionality), typically found in bivalves from littoral aerobic environments, as well as in Bathymodiolus thermophilus, which is capable of suspension-feeding: oesophagus, stomach, crystalline style, digestive gland, and intestine. Observations of stomach contents revealed diverse particles from the photic zone, including debris from diatoms and coccolithophorans. In contrast to Bathymodiolus thermophilus, bacteria were rarely observed in the digestive tract, indicating a more complete reliance on surface-originating particles.

scholarly journals Metal influence on metallothionein synthesis in the hydrothermal vent mussel Bathymodiolus thermophilus

2006 ◽  
Vol 143 (3) ◽  
pp. 321-332 ◽  
Author(s):  
Yann Hardivillier ◽  
Françoise Denis ◽  
Marie-Véronique Demattei ◽  
Paco Bustamante ◽  
Marc Laulier ◽  
...  
Keyword(s):  
Hydrothermal Vent ◽  
Bathymodiolus Thermophilus

Microhabitat variation in the hydrothermal vent mussel, Bathymodiolus thermophilus, at the Rose Garden vent on the Galapagos Rift

1988 ◽  
Vol 35 (10-11) ◽  
pp. 1769-1791 ◽  
Author(s):  
C.R. Fisher ◽  
J.J. Childress ◽  
A.J. Arp ◽  
J.M. Brooks ◽  
D. Distel ◽  
...  
Keyword(s):  
Hydrothermal Vent ◽  
Bathymodiolus Thermophilus ◽  
The Rose ◽  
Galapagos Rift

scholarly journals Bathymodiolamides A and B, Ceramide Derivatives from a Deep-Sea Hydrothermal Vent Invertebrate Mussel,Bathymodiolus thermophilus

2011 ◽  
Vol 74 (4) ◽  
pp. 842-846 ◽  
Author(s):  
Eric H. Andrianasolo ◽  
Liti Haramaty ◽  
Kerry L. McPhail ◽  
Eileen White ◽  
Costantino Vetriani ◽  
...  
Keyword(s):  
Deep Sea ◽  
Hydrothermal Vent ◽  
Bathymodiolus Thermophilus

Chromosomes of Pacific hydrothermal vent invertebrates: towards a greater understanding of the relationship between chromosome and molecular evolution

2009 ◽  
Vol 90 (1) ◽  
pp. 15-31 ◽  
Author(s):  
D.R. Dixon ◽  
M.T. Jolly ◽  
W.F. Vevers ◽  
L.R.J. Dixon
Keyword(s):  
Hydrothermal Vent ◽  
Structural Information ◽  
Chromosome Analysis ◽  
28S Rrna ◽  
Riftia Pachyptila ◽  
Bathymodiolus Thermophilus ◽  
Coastal Species ◽  
Number Variation ◽  
Chromosome Number Variation ◽  
First Time

Karyotypes for several East Pacific Rise hydrothermal vent invertebrates are described here for the first time: the vestimentiferansRiftia pachyptilaandOasisia alvinae, the alvinellid polychaetesAlvinella pompejana, A. caudataandParalvinella grasslei, the polynoid polychaetesBranchinotogluma grassleiandBranchipolynoe symmytilida, the serpulidLaminatubus alviniand the mytilid bivalveBathymodiolus thermophilus. For comparative purposes, the karyotype of the Atlantic vent musselBathymodiolus azoricusis also described here for the first time. Each species has its own unique chromosomal characteristics which can be interpreted both in terms of group characteristics and species divergence. From comparisons with published results on other vent species and closely-related coastal species, we identified a positive correlation between chromosome number variation and molecular divergence at two ribosomal ribonucleic acid gene loci (the 18S and 28S rRNA). Whilst the patterns of chromosome divergence we found were generally within the ranges previously reported for these taxonomic groupings, there was an apparent inconsistency in the case ofBranchipolynoe symmytilida(EPR) andBranchipolynoe seepensis(MAR), which show a greater degree of divergence at the chromosome level compared with other members of the same genus. Moreover, polychaetes as a whole showed greater variation in the number and structural divergence of chromosomes compared to Mytilids (structural information only). Our findings highlight the great potential for chromosome analysis in future taxonomic and evolutionary studies of the deep-sea vent fauna.

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