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| Garcia, F. |
| Counting annual rings on shells, under favourable climatological conditions, usually permits determination of the age of many bivalves. But the application of this method becomes impossible when meteorological conditions are highly variable, as in the Bay of Fos. Annual winter rings are, in fact, often merged with other rings induced by important physiological processes like gametogenesis. When, therefore, annual rings and pseudoannual rings occur, it is impossible to distinguish between them. SEM offers a good solution to this problem, through the establishment of a scheme of interpretation. This method would also be suitable to identify the two main types of rings that could be confused in Ruditapes decussatus L. of the Bay of Fos, using optic microscopy... |
| Tipo: Text |
Palavras-chave: EUROPEAN CARPET CLAM; GROWTH RINGS; VONBERTALANFFY GROWTH MODEL; OPTIC AND ELECTRONIC MICROSCOPY; MEDITERRANEAN SEA. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00100/21135/18755.pdf |
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| Harmelin, Jg; Dhondt, Jl. |
| The deep-water benthos (115-2100 m) was sampled in the Atlantic-Mediterranean exchange area (Balgim cruise, N.O. Cryos: lberian-Moroccan Gulf, Strait of Gibraltar, Alboran Sea). The species richness of the bryozoan fauna (146 spp.) showed a marked between-site variability. Peaks of species richness occurred on both sides and in the Strait of Gibraltar under various conditions of temperature and salinity. 'rhe common features of the corresponding sites were the abundance of suitable substrates and the presence of currents facilitating supply of food and propagules. In the Alboran Sea, the species richness decreased with depth more rapidly than in the Atlantic and the depth distribution of several deep-water species showed an upward shift. There is an... |
| Tipo: Text |
Palavras-chave: MEDITERRANEAN SEA; GIBRALTAR AREA; BIOGEOGRAPHY; BATHYAL; BRYOZOA. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00094/20531/18212.pdf |
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| Baussant, T; Ibanez, F; Dallot, S; Etienne, M. |
| Between March and June 1988, a series of diurnal acoustic records was carried out using a 50 kHz echosounder on a transect crossing the density front of the Ligurian Sea, off Villefranche-sur-Mer (Mediterranean Sea). The depth, thickness and pattern of the sound scattering layers were studied with respect to physical (temperature, salinity and density) and biological (chlorophyll a) measurements made along the acoustic transect. Seasonal differences were observed. A surface scattering layer (SSL), from 0 to 100 m, and a main deep scattering layer (MDSL), located between 250 and 550 m, occurred permanently during the study. In spring, an intermediate scattering layer (ISL), about 50 m thick, occurred between the SSL and the MDSL. The ISL, a permanent... |
| Tipo: Text |
Palavras-chave: SOUND SCATTERING LAYERS; MEDITERRANEAN SEA; LIGURIAN SEA FRONT; CYCLOTHONE-BRAUERI (GONOSTOMATIDAE). |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00100/21164/18783.pdf |
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| Theodorou, Aj. |
| The development of the concept of a "neutral surface" - an isopycnal surface refined by the introduction of a variable reference pressure - is presented. Problems in approximating such a surface (concerning, for example and inter alia, the reference water parcel to be used in starting a neutral surface; or the reference pressure and parcel to be used and path to be followed in extending a neutral surface from station to station) are examined. These problems arise because oceanographic reality only provides data at discrete depths from given station networks. The effects of compressibility dependence on the thermohaline properties of a water parcel in delineating a neutral surface are also considered. A new method of approximating neutral surfaces is... |
| Tipo: Text |
Palavras-chave: NEUTRAL SURFACE; OCEANIC CIRCULATION; HYDROLOGICAL DATA; ATLANTIC OCEAN; MEDITERRANEAN SEA. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00101/21251/18864.pdf |
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