Gravity Anomaly and Tectonics in the Northern Part of the North Fiji Basin - Preliminary Result of the 1994 NOFI Cruise under the NEW STARMER Programme     

Matsumoto  Takeshi  Goslin  Jean  Lagabrielle  Yves  Ruellan  Etienne  Tanahashi  Manabu 《Marine Geophysical Researches》1997,19(1):37-53

A surface ship gravity survey was carried out in the northern part of the North Fiji Basin during the NOFI cruise by the R/V l'Atalante in August-September, 1994. The two ridges inside the study area, the South Pandora Ridge and the Tripartite Ridge, present different structures and states of isostatic equilibrium in terms of gravity anomaly and its tectonic implications. The former is supported by a restoring force of an imaginary elastic plate in the crust and the latter by the Airy type isostasy. These characteristics can be derived from the difference in magmatic activity, as influenced by the difference in lithospheric structure. The latter is characterised by greater active magmatism and hydrothermalism underneath the ridge than the former. Such a difference in the magmatic activity and the horizontal scale of the shallow subsurface structure is derived from the difference in the stiffness or viscosity of the lithosphere beneath the two ridges.  相似文献   

Differences in ratios of stable isotopes of nitrogen in long-finned pilot whales (Globicephala melas) in the western and eastern North Atlantic   总被引：1，自引：0，他引：1  

Abend  Alan G.; Smith  Tim D. 《ICES Journal of Marine Science》1995,52(5):837-841

  相似文献   

A proposed mechanism for the Bohuslan herring periods     

Corten  A. 《ICES Journal of Marine Science》1999,56(2):207-220

  相似文献   

The flow of Atlantic water to the North Icelandic Shelf and its relation to the drift of cod larvae   总被引：1，自引：0，他引：1  

Jonsson  Steingrimur; Valdimarsson  Hethinn 《ICES Journal of Marine Science》2005,62(7):1350-1359

  相似文献   

Seabird numbers and prey consumption in the North Atlantic   总被引：1，自引：0，他引：1  

Barrett  Robert T.; Chapdelaine  Gilles; Anker-Nilssen  Tycho; Mosbech  Anders; Montevecchi  William A.; Reid  James B.; Veit  Richard R. 《ICES Journal of Marine Science》2006,63(6):1145-1158

  相似文献   

Far-field control of long-term changes in Northumberland (NW North Sea) coastal zooplankton     

Frid  Christopher L. J.; Huliselan  Niette V. 《ICES Journal of Marine Science》1996,53(6):972-977

  相似文献   

Identification of Danish North Sea trawl fisheries   总被引：1，自引：3，他引：1  

Lewy  Peter; Vinther  Morten 《ICES Journal of Marine Science》1994,51(3):263-272

  相似文献   

Short-Term Benthic Recolonization after Dredging in the Harbour of Ceuta, North Africa   总被引：2，自引：0，他引：2  

José M. Guerra-García  Juan Corzo  & J. Carlos García-Gómez 《Marine Ecology》2003,24(3):217-229

Abstract. The benthic recovery after dredging (area: 2625 m²) was studied in a polluted and enclosed area of the harbour of Ceuta, in which the recolonization through the water column (larvae and adult bedload transport) could be limited by the lack of renewal. The benthos was sampled at two sites (control and dredged) using a van Veen grab and adopting a BACI (Before, After, Control, Impacted) approach. Five samplings were conducted after dredging (3, 15, 30, 90, 180 days). The proportion of gravel in the sediment of the dredged site increased after dredging, while the organic matter decreased. The impact on the community was estimated at species level, using both univariate and multivariate analyses. The maximum negative effect on benthic macrofauna was a reduction by 65% for species richness (15 days after dredging) and by 75% for abundance (3 days after dredging). Between 15 and 30 days after dredging, the abundance of some species such as the molluscs Parvicardium exiguum and Retusa obtusa and the polychaete Pseudomalacoceros tridentata increased considerably in the dredged site, while typical ‘opportunistic’ species such as Capitella capitata were disfavoured by the disturbance. For this small‐scale dredging, about 6 months are required for the disturbed area to re‐establish a sediment structure and a macrobenthic community similar to the undisturbed area. Small‐patch dredging operations are proposed in harbour management whenever possible, since they allow a quick re‐adjustment of the initial sediment structure and benthic communities.  相似文献   

Benthic photosynthesis in submerged Wadden Sea intertidal flats   总被引：3，自引：1，他引：3  

Markus Billerbeck  Hans Ry  Katja Bosselmann  Markus Huettel 《Estuarine, Coastal and Shelf Science》2007,71(3-4):704-716

In this study we compare benthic photosynthesis during inundation in coarse sand, fine sand, and mixed sediment (sand/mud) intertidal flats in the German Wadden Sea. In situ determinations of oxygen-, DIC- and nutrient fluxes in stirred benthic chamber incubations were combined with measurements of sedimentary chlorophyll, incident light intensity at the sediment surface and scalar irradiance within the sediment. During submergence, microphytobenthos was light limited at all study sites as indicated by rapid response of gross photosynthesis to increasing incident light at the sea floor. However, depth integrated scalar irradiance was 2 to 3 times higher in the sands than in the mud. Consequently, gross photosynthesis in the net autotrophic fine sand and coarse sand flats during inundation was on average 4 and 11 times higher than in the net heterotrophic mud flat, despite higher total chlorophyll concentration in mud. Benthic photosynthesis may be enhanced in intertidal sands during inundation due to: (1) higher light availability to the microphytobenthos in the sands compared to muds, (2) more efficient transport of photosynthesis-limiting solutes to the microalgae with pore water flows in the permeable sands, and (3) more active metabolic state and different life strategies of microphytobenthos inhabiting sands.  相似文献   

Impact of offshore oil production installations on the benthos of the North Sea   总被引：3，自引：0，他引：3  

Kingston  P. F. 《ICES Journal of Marine Science》1992,49(1):45-53

  相似文献