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AFRICA [5751]
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EUROPE [4400]
  • Relación entre las variables ambientales y el crecimiento de Pteria colymbus (Mollusca Bivalvia: Pteriidae), en tres profundidades de cultivo

    Felipe Freites, Luis; Guevara, Miguel; Márquez, Adrián; Revilla, Jormil; Narváez, Mariela; Lodeiros, César (2020)
    Se estudió la influencia de las variables ambientales asociadas con tres profundidades de agua (2, 6 y 10 m) en el crecimiento de la concha, la masa seca de los tejidos blandos (MSTB) y la supervivencia de la ostra alada del Caribe Pteria colymbus (Roding, 1798). La clorofila a (Chl-a), el oxígeno disuelto, la materia orgánica particulada (POM) y la temperatura se estudiaron a cada profundidad. Las ostras se colocaron en 135 cestas de plástico con cinco individuos en cada cesta. Se eligieron tres cestas en cada profundidad a intervalos mensuales para las mediciones de parámetros biométricos, bioincrustaciones y supervivencia. Al final del estudio, la masa seca de los individuos cultivados a 10 m fue significativamente menor (prueba no paramétrica de Kruskal-Wallis KW, P < 0,05), mientras que los valores más altos de MSTB correspondientes a las ostras cultivadas a 2 m de profundidad. El análisis del componente principal mostró una relación inversa (temperatura) y directa (Chl-a y POM) con la varianza observada en el MSTB. Teniendo en cuenta los resultados obtenidos en los rendimientos (crecimiento/supervivencia) de P. colymbus, recomendamos llevar a cabo su cultivo a profundidades de agua entre 2 y 6 m.
  • Levels of heavy metals in seawater, sediment and in the tissue of Crassostrea belcheri in the Western estuary of Ganh Rai bay

    Le, Hung Phu; Nguyen, Hong Thu; Pham, Hong Ngoc; Le, Trong Dung; Dao, Viet Ha (2020)
    Recent studies have shown that the seawater, sediment and commercial bivalve molluscs in the studied area have been contaminated by some heavy metals Zn, Cu, Pb and Cr. Highly toxic heavy metals like As, Cd, Pb, Hg have tended to accumulate in the tissue of clams. This paper presents the levels of some heavy metals in the seawater, sediment and soft part of oyster (Crassostrea belcheri) samples collected from the western estuaries of Ganh Rai bay in 2015 and 2017. The results also showed that Ha Thanh and Rach Lo sites recorded the highest contents of most studied metals in oyster samples. Levels of metals in oyster were in the order of Zn > Cu > As > Pb > Cr > Cd > Hg and the contents of metals in oyster did not reflect a correlation with those in surrounding environment. Concerning food safety criteria, Pb, Cd and Hg contents were lower than acceptable limit given by the compilation of FAO (1983), whereas As, Cu and Zn contents exceeded the legal limit, especially Zn contents. Cu and Cr contents in sediment samples of Nga Bay and Dong Hoa estuaries were between LEL-SEL values (≥ LEL and < SEL), which may cause biological impacts at moderate level.
  • Zooplankton community in Thi Nai lagoon in the period of 2001-2020

    Nguyen, Tam Vinh; Doan, Nhu Hai (2020)
    This paper presents the results of the surveys on zooplankton in Thi Nai lagoon from 2001 to 2020. There were 179 species found in the lagoon, among which Copepod was the dominant group with 97 species (50.78% of total species), followed by Cladocera with 20 species (10.36%), Hydrozoa with 18 species (9.33%), Tunicata with 11 species (5.7%) and Siphonophora with 10 species (5.18%). Based on Bray-Curtis similarity analysis of zooplankton community and the station position, the sampling stations in the lagoon were grouped into three areas: The upper lagoon (UP), the middle (MI), and the mouth of the lagoon (MO). Among the surveyed years, there was a slight variation in the species number, while the density decreased by time and was especially low in 2020. Zooplankton density was much lower in the rainy season compared to that in the dry season, while the species number was less varied. Analysis of the differences between the areas in the lagoon demonstrated a clear distribution pattern of zooplankton with a decreasing density and an increasing number of species from upper lagoon to the mouth of the lagoon. Zooplankton diversity was less affected by time and only the Pielou index in the MI area between 2004 and 2009 was significantly different. Analysis of the various indices between seasons showed that the MO area was less volatile than the two other regions. The multi-dimensional scaling analysis demonstrated that zooplankton community was less variable by regions (50% similarity) compared to by the years (only 30% of similarity), except in 2009 and 2020 when differences among the areas were significant. Seasonal community change between the dry and rainy seasons was 30%.
  • Variation of phytoplankton community structure in Quang Ngai coastal waters during 2015-2019

    Huynh, Thi Ngoc Duyen; Tran, Thi Minh Hue; Tran, Thi Le Van; Phan, Tan Luom; Nguyen, Ngoc Lam; Doan, Nhu Hai (2020)
    Phytoplankton in coastal waters are important for the evaluation of either biodiversity or environmental impacts because of this highly vulnerable ecosystem. Seasonal and annual changes in the phytoplankton community structure in Quang Ngai waters during the period 2015 to 2019 were analyzed to assess the phytoplankton diversity and reveal possible causes of these changes. A total of 366 phytoplankton taxa belonging to 10 classes were identified throughout this present study. The highest species number was found in 2019 with 295 taxa, followed by those in 2015 (247), 2017 (185), and 2018 (99). The waters of Ly Son transect showed the highest diversity and most stable phytoplankton communities in both dry and rainy seasons, whereas the stations of Quang Ngai coast revealed high variability of the communities. All diversity indices including Margalef, Pielou, Shannon, Simpson did not reflect well differences in average values but a certain degree of variances, indicating possible environmental impacts. During the study time, there were blooms of certain diatom species including Skeletonema spp. in 2015 and Pseudo-nitzschia spp. in 2019. Analysis of a diatoms index, Centric/Pennate ratio, indicated that the waters were in eutrophic status with a decreasing trend from the coast area to Ly Son island in 2015 and 2019. This research built up fundamental data on phytoplankton communities for Quang Ngai province. The Centric/Pennate diatom index and diversity would be used as indicators for environmental changes and their values provided warning of eutrophication in this coastal waters including the water surrounding Ly Son island.
  • Los peces triple aletas del Santuario de Fauna y Flora Malpelo, Pacífico colombiano

    Rojas-Vélez, Stephania; Beltrán-León, Beatriz Susana; Tavera, José; Instituto de Investigaciones Marinas y Costeras “José Benito Vives de Andréis” (2021)
    La familia Tripterygiidae incluye a los peces conocidos como triple aletas por la división en tres segmentos que caracteriza la aleta dorsal de sus especies. De las 183 especies reconocidas como válidas para la familia solamente 16 se distribuyen en el Pacífico oriental, incluyendo dos endémicas y únicas representantes de la familia en el Santuario de Fauna y Flora Isla Malpelo: Axoclinus rubinoffi y Lepidonectes bimaculatus. El presente trabajo aporta datos morfológicos y ecológicos de la etapa larval y adulta para las dos especies de triple aletas del santuario. Con respecto a las larvas, la abundancia promedio fue de 1,88 individuos/m2 para A. rubinoffi y 0,25 individuos/m2 para L. bimaculatus en las estaciones nocturnas donde fueron recolectadas, a 0,8 y 1,61 km de distancia al occidente y en localidades muy cercanas a la isla como El Arrecife y La Nevera. Los adultos fueron recolectados alrededor de la isla entre 0-30 m de profundidad y su abundancia fue de 0,22 individuos/m2 para L. bimaculatus y de 0,19 individuos/m2 para A. rubinoffi. Se amplía el conocimiento de la variabilidad natural de los rangos morfológicos de ambas especies y se evidencian diferencias entre las densidades poblacionales encontradas en previos estudios. Para entender las dinámicas poblacionales de estas

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