scholarly journals Amphipoda (Crustacea; Peracarida) from the Hydrothermal vent system of the Juan De Fuca Ridge, Escabana trough and Gorda ridge, Northeast Pacific. Part I. Lysianassidae and Sebidae

Zootaxa ◽  
2007 ◽  
Vol 1445 (1) ◽  
pp. 1-26 ◽  
Author(s):  
KIM LARSEN
Keyword(s):  
New Species ◽  
Hydrothermal Vent ◽  
Juan De Fuca Ridge ◽  
Fuca Ridge ◽  
Northeast Pacific ◽  
The Family ◽  
Juan De Fuca ◽  
Gorda Ridge

The amphipod fauna from hydrothermal vent habitats on the Juan de Fuca Ridge and from experimental wood deployments are examined. The material revealed, among others, a number of lysianassid species belonging to the genera, Paronesimoides Pirlot, 1933 and Schisturella Norman, 1900, and a species of the family Sebidae, belonging to the genus Seba Bate, 1862. The new species: Paronesimoides voightae, Schisturella hansgeorgi, and Seba bathybia are described. A key to Paronesimoides and Schisturella are given

Tanaidacea (Crustacea; Peracarida) from chemically reduced habitatsóthe hydrothermal vent system of the Juan de Fuca Ridge, Escabana Trough and Gorda Ridge, northeast Pacific

Zootaxa ◽  
2006 ◽  
Vol 1164 (1) ◽  
pp. 1 ◽  
Author(s):  
KIM LARSEN
Keyword(s):  
Hydrothermal Vent ◽  
Hydrothermal Vents ◽  
Juan De Fuca Ridge ◽  
Ontogenetic Variation ◽  
Fuca Ridge ◽  
Northeast Pacific ◽  
New Information ◽  
Juan De Fuca ◽  
Gorda Ridge

The tanaidacean fauna from hydrothermal vents habitats on the Juan de Fuca Ridge, Escabana Trough, Gorda Ridge and from experimental wood deployments, is examined. The material revealed species belonging to the genera; Armaturatanais, Meromonakantha, Neotanais, Pseudotanais, Protanais, Typhlotanais, and an undescribed typhlotanaid genus. The tanaidaceanfauna was almost exclusively dominated by Protanais, which in turn was almost exclusively found on recovered wood blocks. Most species are new to science and the species Armaturatanais trispinipodus n. sp. and Protanais ligniamator n. sp. are described. New information on tanaidacean ontogenetic variation is given for Protanais ligniamator.

Amphipoda (Crustacea: Peracarida) from chemically reduced habitats; the hydrothermal vent system of the north-east Pacific. Part II. Melitidae and Eusiridae

2007 ◽  
Vol 87 (5) ◽  
pp. 1207-1217 ◽  
Author(s):  
Kim Larsen ◽  
Traudl Krapp-Schickel
Keyword(s):  
New Species ◽  
Hydrothermal Vent ◽  
Hydrothermal Vents ◽  
Juan De Fuca Ridge ◽  
North East ◽  
The North ◽  
East Pacific ◽  
Juan De Fuca ◽  
Gorda Ridge ◽  
One New Species

The amphipod fauna from habitats in hydrothermal vents on the Juan de Fuca Ridge, Escabana Trough, and Gorda Ridge and from experimental wood deployments is examined. The material revealed one new species of Melitidae, Bathyceradocus wuzzae, and one of Eusiridae, Leptamphopus fragilis.

Characteristics of a hydrothermal vent assemblage on a volcanically active segment of Juan de Fuca Ridge, northeast Pacific

2001 ◽  
Vol 58 (3) ◽  
pp. 530-542 ◽  
Author(s):  
Maia Tsurumi ◽  
Verena Tunnicliffe
Keyword(s):  
Hydrothermal Vent ◽  
Juan De Fuca Ridge ◽  
Species Pool ◽  
Biological Communities ◽  
Fuca Ridge ◽  
Northeast Pacific ◽  
Decadal Scale ◽  
Juan De Fuca ◽  
Community Changes ◽  
Active Segment

An eruption on Cleft segment, Juan de Fuca Ridge, in 1986 provided an opportunity to observe potential successional patterns in vent-animal colonisation. Other objectives were to describe the Cleft fauna, examine the distribution and abundance of selected taxa, and determine if the fauna reflected changes in water chemistry. Biological samples were tubeworm grabs collected by submersible, and visual data were still photographs and videos. Two years post eruption, there were extensive diffuse vents and 23 of the 44 species constituting the Cleft species pool were present. Five years post eruption, most low-temperature vents were extinct. High-temperature venting was maintained, and biological communities were reduced in visual extent. Four of the 44 species in samples from 1988-1994 accounted for over 90% of the individuals. Cluster analyses of species collected on tubes did not distinguish year or substratum differences, suggesting that a study of less than a year is necessary to document successional patterns at new vents. The Cleft subset of the Juan de Fuca Ridge species pool is likely adapted to episodic eruptive events on the decadal scale. Major changes in fluid chemistry did not result in detectable community changes other than habitat loss due to a decrease in dissolved sulphide availability.

scholarly journals Biodiversity and trophic ecology of hydrothermal vent fauna associated with tubeworm assemblages on the Juan de Fuca Ridge

2018 ◽  
Vol 15 (9) ◽  
pp. 2629-2647 ◽  
Author(s):  
Yann Lelièvre ◽  
Jozée Sarrazin ◽  
Julien Marticorena ◽  
Gauthier Schaal ◽  
Thomas Day ◽  
...  
Keyword(s):  
Food Webs ◽  
Hydrothermal Vent ◽  
Trophic Structure ◽  
Juan De Fuca Ridge ◽  
Small Scale ◽  
Ecological Niches ◽  
Primary Role ◽  
Fuca Ridge ◽  
Juan De Fuca ◽  
Successional Stages

Abstract. Hydrothermal vent sites along the Juan de Fuca Ridge in the north-east Pacific host dense populations of Ridgeia piscesae tubeworms that promote habitat heterogeneity and local diversity. A detailed description of the biodiversity and community structure is needed to help understand the ecological processes that underlie the distribution and dynamics of deep-sea vent communities. Here, we assessed the composition, abundance, diversity and trophic structure of six tubeworm samples, corresponding to different successional stages, collected on the Grotto hydrothermal edifice (Main Endeavour Field, Juan de Fuca Ridge) at 2196 m depth. Including R. piscesae, a total of 36 macrofaunal taxa were identified to the species level. Although polychaetes made up the most diverse taxon, faunal densities were dominated by gastropods. Most tubeworm aggregations were numerically dominated by the gastropods Lepetodrilus fucensis and Depressigyra globulus and polychaete Amphisamytha carldarei. The highest diversities were found in tubeworm aggregations characterised by the longest tubes (18.5 ± 3.3 cm). The high biomass of grazers and high resource partitioning at a small scale illustrates the importance of the diversity of free-living microbial communities in the maintenance of food webs. Although symbiont-bearing invertebrates R. piscesae represented a large part of the total biomass, the low number of specialised predators on this potential food source suggests that its primary role lies in community structuring. Vent food webs did not appear to be organised through predator–prey relationships. For example, although trophic structure complexity increased with ecological successional stages, showing a higher number of predators in the last stages, the food web structure itself did not change across assemblages. We suggest that environmental gradients provided by the biogenic structure of tubeworm bushes generate a multitude of ecological niches and contribute to the partitioning of nutritional resources, releasing communities from competition pressure for resources and thus allowing species to coexist.

Lithium isotopic systematics of hydrothermal vent fluids at the Main Endeavour Field, Northern Juan de Fuca Ridge

2004 ◽  
Vol 212 (1-2) ◽  
pp. 17-26 ◽  
Author(s):  
D.I. Foustoukos ◽  
R.H. James ◽  
M.E. Berndt ◽  
W.E. Seyfried
Keyword(s):  
Hydrothermal Vent ◽  
Juan De Fuca Ridge ◽  
Fuca Ridge ◽  
Juan De Fuca ◽  
Main Endeavour

Revision of the species of Ridgeia from northeast Pacific hydrothermal vents, with a redescription of Ridgeia piscesae Jones (Pogonophora: Obturata = Vestimentifera)

1995 ◽  
Vol 73 (2) ◽  
pp. 282-295 ◽  
Author(s):  
Eve C. Southward ◽  
Verena Tunnicliffe ◽  
Michael Black
Keyword(s):  
Hydrothermal Vents ◽  
Juan De Fuca Ridge ◽  
Morphological Data ◽  
Transform Fault ◽  
Ridgeia Piscesae ◽  
Northeast Pacific ◽  
Juan De Fuca ◽  
Gorda Ridge ◽  
Distance Data ◽  
Animal Size

Examination of vestimentiferan worms attributed to the genus Ridgeia from more than 50 vent sites in the northeast Pacific indicates that only one species is present. We amalgamate Ridgeia piscesae Jones and R. phaeophiale Jones under the name R. piscesae and include other forms previously suspected to be different species. Allozyme evidence supports the hypothesis that the populations belong to a highly plastic phenotype. The distance data indicate no substantial genetic differences among populations along Juan de Fuca Ridge and across a transform fault to the northern Gorda Ridge. Morphological data indicate that the original distinction of two species on the basis of obturacular saucer number and tube colour was based on the extremes of a continuum of characteristics that relate to animal size, levels of predation, and probably vent fluid conditions. The intriguing effect of habitat on phenotype in this abundant vent animal requires further investigation now that the taxonomy is better understood.

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