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Presencia de Poecilia mexicana Steindachner en un estuario hiperhalino temporal del golfo de MéxicoEn esta contribución se registra por primera vez a Poecilia mexicana en un estuario ciego bajo condiciones de hiperhalinidad en el golfo de México y se analizan diversas características ecológicas de la especie. Los especímenes, 170 en total (128 hembras y 42 machos), se recolectaron en mayo de 2013 en el estuario Laguna El Llano, Veracruz, México, el cual presentó aguas cálidas (31,4°C), bien oxigenadas (9,45 mg/L), transparentes, e hiperhalinas (promedio 73 UPS). Las hembras se recolectaron en un intervalo de tallas de 4,28-59,21 mm de longitud patrón y de 0,04-5,48 g en peso; los machos se colectaron en un intervalo de tallas de 15,73- 51,41 mm LP y de 0,091-2,97 g en peso. El intervalo de talla más numeroso fue de 10-29 mm de longitud patrón. Las hembras presentaron un crecimiento alométrico negativo; los machos presentaron un crecimiento isométrico. La hiperhalinidad del agua no pareció afectar el proceso de reproducción de P. mexicana, pues se encontraron hembras maduras con ovocitos, huevos y embriones, algunas de ellas con superfetación. La fecundidad se registró entre 12-179 ovocitos/hembra, 8-162 huevos/hembra y 29-72 embriones/hembra. El factor de condición se correlacionó positivamente con la longitud patrón y el peso.
An estimate of the sea level trend along the Tunisia coastsThis study evaluates the sea level trend along the Tunisia coasts based on available historical and recent tide gauge observations for the period 1880-2018. The stations used are located in the Tunisia coasts and in the western side of the Strait of Gibraltar. Sea level series based on reanalyses and Mediterranean Sea model simulations are also used. First, a single series representing the western Strait of Gibraltar sea level evolution is constructed. Then, the sea level series along the Tunisia coasts is constructed based on the hypothesis that the observed sea level drop relative to that in the western side of the Strait of Gibraltar remains nearly unchanged when long term periods are considered. The constructed series for the Tunisia coasts shows an evident sea level rise superimposed on a decadal variability in connection with the North Atlantic Oscillation (NAO). For the whole period, the estimated sea level trend is +1.5 mm/year, whereas it is +3mm/y for the recent period 1980- 2015. In addition to the widely accepted of the sea level rise acceleration during the recent decades, this higher trend may also be attributed to the effect of the decadal variability. Projections for the future state of the sea level along the Tunisia coasts are given based on the trend estimates found in this study.
A zoomed 3d circulation model for the Monastir bay: comparison to operational analysesThe present work aims at developing a zoomed 3D hydrodynamic model that simulates the circulation of water masses for the Central-Eastern coasts of Tunisia (Nabeul to Chebba) with the bay of Monastir in the center. The resolution of the model gradually increases from the edges (~ 1100 m) towards the bay of Monastir where it is of the order of 300 m. The model is forced at the sea surface by atmospheric data from a neighboring weather station and by ocean re-analyses. We present here a comparison between the results of the model and the reanalyses for the simulated year 2008. The outputs of the model show a strong seasonal cycle with winter cooling and summer warming more accentuated near the coasts. The surface salinity is modulated by the penetration of the Atlantic water vein in the Gulf of Hammamet, more important in summer. Near shallow coastal areas, the salinity is relatively high especially in the bay interior and is more accentuated in summer. The circulation is characterized by currents directed towards the southeast in winter and the West and Northwest in summer. These simulation results are similar to those of the re-analyses. The re-analyses offshore currents are, however, oriented towards the southwest in summer. A comparison of vertical sections of temperature and salinity shows high agreement with the presence of the trace of the Atlantic water vein at a depth of about 50 to 60 m.
Tres nuevos registros de hidrozoos (Cnidaria: Hydroidomedusae), para Cuba.Se registran por primera vez para aguas cubanas una familia, tres géneros y tres especies de hidrozoos marinos. Esta es la primera cita de Pteroclava kempfi para el Océano Atlántico.
Estimation of the spawning ground of some fish species in the Nha Trang bayThe paper presents the results of determining the spawning grounds of some fish species in Nha Trang bay MPA, which were sampled in 9/2018, 11/2018, 5/2019 and 7/2019. The analysis results are based on the distribution of the general density and the developmental stages, analysis of decision trees from egg density, location of stations and months by CHAID (Chi-square Automatic Interaction Detector), allowing a relatively accurate estimate of the spawning ground of the red anchovy (Encrasicholina punctifer Fowler, 1938) and the species of the genus Scarus. As a result, the main spawning grounds for red anchovy were the east of Hon Rua and the northeast of Hon Tam and that of Scarus is the southwest of Hon Mun island.