scholarly journals Limits on the bathymetric distribution of keratose sponges:a field test in deep-water

1998 ◽  
Vol 174 ◽  
pp. 123-139 ◽  
Author(s):  
M Maldonado ◽  
CM Young
Keyword(s):  
Field Test ◽  
Deep Water ◽  
Bathymetric Distribution

Endemic Lake Baikal sponges from deep water. 2: Taxonomy and Bathymetric Distribution

Zootaxa ◽  
2017 ◽  
Vol 4236 (2) ◽  
pp. 335 ◽  
Author(s):  
VALERIA B. ITSKOVICH ◽  
OXANA V. KALUZHNAYA ◽  
ELENA VEYNBERG ◽  
DIRK ERPENBECK
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Deep Water ◽  
Great Depth ◽  
Limiting Factor ◽  
Bathymetric Distribution ◽  
Morphological Studies ◽  
Lubomirskia Baicalensis ◽  
The Family ◽  
Baikalospongia Intermedia

Unique samples of deep-water sponges of Lake Baikal were collected between 120 and 1450 m depth and their taxonomy and bathymetric distribution were studied. Based on morphological studies with scanning electron microscopy (SEM) and molecular analyses (CO1, ITS) we describe a new species, Baikalospongia abyssalis sp. nov. Spicule morphology of this new species is similar to Palaeoephydatia sp., a species previously known only from fossils in Late Pliocene (3.2−2.8 mya) sediments. Other sponge samples collected were identified as Baikalospongia intermedia intermedia, B. intermedia profundalis, B. bacillifera, B. fungiformis, B. martinsoni and Swartschewskia papyracea, all from the family Lubomirskiidae. Sponge specimens with giant spicules, identified as B. fungiformis, were found at great depths. B.i. intermedia and B. i. profundalis are dominating species at great depth. Light is a limiting factor for distribution of Lubomirskia baicalensis, possibly due to its symbiosis with photosynthetic protists. The current study extends our knowledge on the distribution boundaries of Lubomirskiidae at great depths. 

Bathymetric distribution and diversity of deep water polychaetous annelids in the Sigsbee Basin, northwestern Gulf of Mexico

Hydrobiologia ◽  
2003 ◽  
Vol 496 (1-3) ◽  
pp. 361-370 ◽  
Author(s):  
Alma Yazmín Pérez-Mendoza ◽  
Pablo Hernández-Alcántara ◽  
Vivianne Solís-Weiss
Keyword(s):  
Gulf Of Mexico ◽  
Deep Water ◽  
Bathymetric Distribution

scholarly journals FERRY WAVE MEASUREMENTS IN DEEP WATER

1986 ◽  
Vol 1 (20) ◽  
pp. 46
Author(s):  
Ronald E. Nece ◽  
Michael R. McCaslin ◽  
Derald R. Christensen ◽  
Harry H. Yeh
Keyword(s):  
Field Test ◽  
Deep Water ◽  
Test Procedures ◽  
Ship Waves ◽  
Wave Measurements ◽  
Vessel Speed

Data are presented for ship waves generated and measured in deep water. Results show the variation of maximum vessel waves with both vessel speed and distance from the vessel sailing line. Three automobile ferries of different configurations were tested. Field test procedures, limitations, and problems are described.

Factors Affecting Reception Range of Ultrasonic Tags in a Georgia Estuary

2010 ◽  
Vol 44 (5) ◽  
pp. 17-24 ◽  
Author(s):  
Charles F. Cotton
Keyword(s):  
Field Test ◽  
Deep Water ◽  
Environmental Effects ◽  
Environmental Variables ◽  
Factors Affecting ◽  
Snapping Shrimp ◽  
Large Aggregation ◽  
Significant Difference ◽  
Ultrasonic Transmitter

AbstractUltrasonic tags are commonly used for marine biotelemetry, but little or no information exists about the in situ reception range or how different environmental variables affect the reception range of telemetry equipment. In this study, I used active tracking techniques to empirically determine three environmental effects on reception range of ultrasonic tags. Specifically, I examined the effects of (1) tag depth, (2) depth under the hydrophone, and (3) presence of snapping shrimp (Alpheidae) on the reception range of an ultrasonic transmitter (tag) in a Georgia estuary. Placing the tag in deep (8.8‐11.3 m) versus shallow (0.6‐1.5 m) water while the hydrophone was over deep water (3.4‐11.3 m) caused no significant difference in reception range. Placing the hydrophone over shallow (0.6‐2.7 m) versus deep (6.4‐9.1 m) water while the tag was in shallow (1.2‐1.8 m) water caused a significant decrease in reception range. The presence of a large aggregation of snapping shrimp between the hydrophone and the tag also caused a significant decrease in reception range. This study highlights the need for researchers to field-test equipment before conducting telemetry projects.

Reproductive Patterns of Pacific Ocean Perch (Sebastodes alutus) off Washington and British Columbia and their Relation to Bathymetric Distribution and Seasonal Abundance

1971 ◽  
Vol 28 (3) ◽  
pp. 417-425 ◽  
Author(s):  
Donald R. Gunderson
Keyword(s):  
British Columbia ◽  
Pacific Ocean ◽  
Deep Water ◽  
Seasonal Abundance ◽  
Bathymetric Distribution ◽  
Mating Period ◽  
Spawning Period ◽  
Reproductive Patterns ◽  
Catch Rates ◽  
Spring Maximum

Females of the ovoviviparous species Sebastodes alutus release their larvae in March in the Washington–British Columbia area. Male maturity data from Queen Charlotte Sound indicated that males probably inseminate females in September or October. Examination of the annual bathymetric cycle in three major commercial trawling areas showed that mating and insemination occur while Pacific ocean perch are moving to deep water from the shallow-water regions inhabited in summer and that females release their larvae while in the deepest part of their bathymetric range.Total 1955 through 1965 catch by month, and 11-year mean monthly catch rates were used to indicate relative seasonal abundance on major fishing grounds. Where deepwater regions were trawled, these indices showed a spring maximum associated with the March spawning period. In all areas studied there was a midsummer slump in catch and catch rate, and an October maximum occurring during the suggested mating period.

Early Mesozoic (Late Triassic-Early Jurassic) Tethyan brachiopod biofacies: possible evolutionary intra-phylum niche replacement within the Brachiopoda

Paleobiology ◽  
1995 ◽  
Vol 21 (4) ◽  
pp. 479-495 ◽  
Author(s):  
Michael R. Sandy
Keyword(s):  
North America ◽  
Deep Water ◽  
Additional Data ◽  
Early Jurassic ◽  
Late Triassic ◽  
Southern Europe ◽  
Low Latitude ◽  
Bathymetric Distribution ◽  
Early Mesozoic ◽  
Extinction Event

Distributions of brachiopods from low-latitude paleogeographic settings, primarily in the Tethyan Ocean of southern Europe, with additional data from North America allow some observations on the bathymetric distribution of early Mesozoic brachiopod orders. Norian and latest Triassic (Rhaetian) brachiopod biofacies are dominated in shallowest waters by short-looped terebratulids (Terebratulidina) while spire-bearing athyrids (Athyrida) are common components of deeper-water environments in the latest Triassic. In the late Early Jurassic (Pliensbachian), shallow-water brachiopod faunas are dominated by rhynchonellids, short-looped terebratulids are commoner in relatively deeper shelf waters, and spiriferids and long-looped terebratulids (Terebratellidina) are abundant in deeper-water shelf environments.Following the end-Triassic extinction event there appears to be niche-replacement in deep-water shelf environments of Late Triassic athyrids by spiriferids and long-looped terebratulids in the Early Jurassic. Rhynchonellids appear to have diversified into shallowest water environments; specialized short-looped terebratulids may have occupied deeper-water niches that resulted ultimately in the success of the enigmatic Pygopidae later in the Jurassic and Cretaceous.

scholarly journals Checklist of Recent Cylindriscala (Caenogastropoda: Epitoniidae) of the world

Check List ◽  
2012 ◽  
Vol 8 (4) ◽  
pp. 740
Author(s):  
Silvio Felipe Barbosa Lima ◽  
Martin Lindsey Christoffersen
Keyword(s):  
Deep Water ◽  
Bathymetric Distribution ◽  
The World ◽  
Generic Position

A checklist of deep water gastropods belonging to the genus Cylindriscala is presented based mainly on data from the literature. We list a total of 21 species and include information on the geographic and bathymetric distribution of each taxon. The generic position of eight species previously included in this genus is questioned and requires a review.

Species of Acryptolaria Norman, 1875 (Cnidaria: Hydrozoa) collected by US Antarctic and sub-Antarctic expeditions

Zootaxa ◽  
2020 ◽  
Vol 4767 (2) ◽  
pp. 277-294
Author(s):  
ÁLVARO L. PEÑA CANTERO
Keyword(s):  
United States ◽  
Species Diversity ◽  
Deep Water ◽  
The United States ◽  
Conveyor Belt ◽  
Bathymetric Distribution ◽  
The Third ◽  
Wide Geographical Distribution ◽  
High Species Diversity ◽  
Antarctic Research

Acryptolaria is a worldwide genus of deep-water benthic hydroids. The genus has relatively high species diversity, with 36 species described so far, yet most of them have been reported only occasionally. As a result, scientific knowledge of their ecology and distribution is scarce. Here I present the results of the study of species of Acryptolaria collected during several Antarctic and sub-Antarctic expeditions under the United States Antarctic Research Program between 1958 and 1986. Eight species were found in the collection (plus one determined to the genus level), with A. operculata having the highest occurrence. Acryptolaria flabellum is reported for the second time; the study also represents the third record for A. corniformis and A. minuta. Despite the scarcity of records, most of the species studied seem to have a wide geographical distribution, which could be related to their deep-water bathymetric distribution and the deep-water circulation of the Great Ocean Conveyor Belt. 

Revision of the Cancellariidae (Gastropoda: Caenogastropoda) in the deep water of the Norwegian Sea, with the description of a new species of Admete

2010 ◽  
Vol 91 (2) ◽  
pp. 493-504 ◽  
Author(s):  
Tore Høisæter
Keyword(s):  
New Species ◽  
Continental Slope ◽  
Deep Water ◽  
Taxonomic Status ◽  
Valid Species ◽  
Bathymetric Distribution ◽  
Norwegian Sea ◽  
Western Norway ◽  
A New Species

A new species of Admete Møller, 1842 (Cancellariidae), A. clivicola is described from the upper continental slope off south-western Norway, and the species Admete contabulata Friele, 1879 is reinstated as a valid species. Iphinopsis inflata (Friele, 1879) is redescribed and a lectotype for the species is established. The taxonomic status and bathymetric distribution of the species of Admete and Iphinopsis in the Norwegian Sea are discussed.

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