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  • Ashgill biostratigraphy  (1)
  • Corals  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Netherlands journal of geosciences 77 (1998), S. 77-91 
    ISSN: 1573-9708
    Keywords: diagenesis ; metamorphism ; Ashgill biostratigraphy ; Variscan belt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Conodont colour alteration index (CAI) data in Upper Ordovician rocks from several areas of the Variscan domain in the Iberian Peninsula indicate conditions ranging from diagenesis to low-grade metamorphism. In most of the areas, where studies using other indicators, such as illite crystallinity (IC) or where vitrinite reflectance are lacking, the CAI method has permitted a preliminary estimation of the metamorphic grade. In the Almadén syncline (Central-Iberian Zone), where IC studies are available, the thermal conditions inferred from CAI data agree with those obtained by the IC method. In the Puertollano–Almuradiel syncline, the thermal interval obtained primarily from fluid inclusions (270–370°C) overlaps considerably with that obtained from CAI data (180–340°C). In general, cleavage in rocks is present in anchizonal or epizonal conditions, whereas in diagenetic conditions with CAI ≥ 2.5, cleavage is scarce. The conodont texture changes with increasing metamorphism, and apatite recrystallisation appears in general with CAI ≥ 5. Variation of CAI values within a single sample and/or within short stratigraphic distances observed at several localities is due to hydrothermal activity.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2021-05-19
    Description: Este trabajo ofrece la primera lista taxonómica de macroalgas, corales y peces presentes en los arrecifes de coral del Parque Nacio- nal Cayos de San Felipe, en la plataforma suroccidental de Cuba. El inventario reúne información de siete años de muestreos in situ (entre 2006 y el 2015) y de publicaciones y reportes de pesca. Las observaciones se realizaron en manglares, en fondos blandos con o sin vegetación y en biotopos de arrecife de coral entre 1 y 25 m de profundidad (cresta, explanadas rocosas y camellones). Se encontró diversidad alta de especies, todas registradas con anterioridad en la región occidental de Cuba. La lista incluyó 4 especies de angios- permas marinas, 83 de macroalgas, 4 de hidrocorales, 52 de cora- les pétreos y 201 de peces (9 Chondrichthyes y 192 Actinopterygii). Nueve especies de corales y 14 de peces se consideran amenazadas según la lista roja de IUCN y algunas fueron escasas en el parque. La alta abundancia de juveniles y adultos de pargos con importan- cia para la pesca y la escasez de depredadores de talla grande (más de 40 cm) fue un resultado significativo. Por esto, la presencia del pez león se debe considerar como una amenaza potencial a la biodi- versidad local. Para lograr la conservación de la salud del arrecife, se recomienda realizar estudios de la ictiofauna y su relación con la condición del sustrato y la actividad de pesca.
    Description: This paper presents the first check list of macroalgae, corals and coral ports. Observations were made in mangroves, soft bottoms with or without vegetation and coral reef habitats between 1 and 30 m depth (crest, rocky plains and spur-groove). High diversity of species were found, all of them previously reg- istered in the western region of Cuba. The list included 4 species of marine angiosperms, 83 of macroalgae, 4 of hydrocorals, 52 of stony cor- als and 201 of fishes (9 Chondrichthyes and 192 Actinopterygii). Nine species of corals and 14 of fish were considered threatened by IUCN red list and some of them were rare in the park. The high abundance of juveniles and adults of snap- pers of importance to fisheries and the scarce presence of predators of big size (more than 40 cm) was a significant result. Due this, the pres- ence of the lionfish should be considered as a potential threat to local biodiversity. To achieve coral reef health conservation, we recommend the study of the ichthyofauna and its relation- ship with the condition of the substrate and the fishing activity.reef fish in the National Park “San Felipe Keys”, on the southwest shelf of Cuba. The inventory compiled information from seven years of in situ sampling (between 2006 and 2015) and from papers and fisheries re-
    Description: Published
    Keywords: Lista de especies ; Diversidad ; Macroalgas ; Corales ; Peces ; Check list ; Diversity ; Macroalgae ; Corals ; Fish
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp.21-43
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