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7 resultados encontrados para: TEMA: Plataforma continental
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1.
Artículo
*Solicítelo con su bibliotecario/a
Influence of bottom environment conditions and hydrographic variability on spatiotemporal trends of macrofaunal amphipods on the Yucatan continental shelf
Paz Ríos, Carlos Enrique (autor) ; Pech Pool, Daniel Guadalupe (autor) ; Mariño Tapia, Ismael (autor) ; Simões, Nuno (autor) ;
Disponible en línea
Contenido en: Continental Shelf Research Volumen 198, artículo número 104098 (July 2020), p. 1-11 ISSN: 0278-4343
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Amphipod species collected during three oceanographic campaigns (2010–2012) were analyzed to describe their spatiotemporal community distribution trends and their relationships with bottom water and sediment variables. The results show that the species richness (117 spp.) did not reach its maximum value according to the species accumulation curve (up to 187 spp.). Multivariate analyses and constrained ordinations techniques detected three main amphipod assemblages along the longitudinal gradient (i.e., Western Caribbean, Mid-Yucatan, and West-Yucatan) and during two temporal hydrographic scenarios (i.e., upwelling in 2010–2011 and non- upwelling in 2012). In 2010–2011, low values in species richness and abundance from the Western Caribbean and eastern Mid-Yucatan assemblages were associated with relatively low bottom-water temperatures from the upwelling systems. In 2012, the absence of upwelling and the occurrence of a warm-core anticyclonic eddy seemed to cause an increase in species richness and abundance in the three assemblages. The hydrographic variability and sediment characteristics are suggested as the major environmental drivers that shapes the soft- bottom amphipod community structure and diversity in the Yucatan continental shelf.


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Resumen en: Inglés |
Resumen en inglés

Background: We assessed metrics of the metazoan parasite infracommunities of the dusky founder (Syacium papillosum) as indicators of aquatic environmental health of the Yucatan Shelf (YS) prior to oil extraction. We sampled the dusky founder and its parasites along the YS, mostly during the 2015 north wind season (November–April). Our aims were: (i) to determine whether the parasite infracommunity metrics of S. papillosum exhibit signifcant diferences among YS subregions; (ii) to determine whether the probability of the occurrence of its parasite species and individu‑ als were afected by environmental variables, nutrients, heavy metals and hydrocarbons at the seascape level; and (iii) to determine whether there were statistical diferences between the parasite infracommunity metrics of S. papillosum from YS and those of Syacium gunteri from the Campeche Sound. Multivariate statistical analyses and generalised additive models (GAMs) were used to examine the potential statistical associations between the contaminants, environmental variables and parasite community metrics, and the maximum entropy algorithm (MaxEnt) was used to characterise the habitat’s suitability for the parasite’s probability of occurrence. Results: We recovered 48 metazoan parasite species from 127 S. papillosum, with larval cestodes and digeneans being the most numerically-dominant. Multivariate analyses showed signifcant diferences in parasite infracommu‑ nity metrics among Western YS, Mid YS and Caribbean subregions, with the latter being the richest in species but not in individuals. The GAM and MaxEnt results indicated a negative efect of top predators (e.g. sharks and rays) removal on parasite metrics. The parasite infracommunities of S. papillosum were twice as rich in the number of species and individuals as those reported for S. gunteri from the Campeche Sound.

Conclusions: The significant differences among subregions in parasite metrics were apparently due to the interruption of the Yucatan current during the north wind season. The fishing of top predators in combination with an influx of nutrients and hydrocarbons in low concentrations coincides with an increase in larval cestodes and digeneans in S. papillosum. The dusky founder inhabits a region (YS) with a larger number of metazoan parasite species compared with those available for S. gunteri in the Campeche Sound, suggesting better environmental conditions for transmis‑ sion in the YS.


3.
Artículo
Testing marine regional-scale hypotheses along the Yucatan continental shelf using soft-bottom macrofauna
Hernández Avila, Iván (autor) ; Ocaña Borrego, Frank Alberto (autor) ; Pech Pool, Daniel Guadalupe (autor) ;
Contenido en: PeerJ No. 8:e8227 (2020), p. 1-28 ISSN: 2167-8359
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Resumen en: Inglés |
Resumen en inglés

Different hypotheses related to the regional-scale configuration of the Yucatan Continental Shelf (YCS) between the Gulf of Mexico (GoM) and the Caribbean Sea have been proposed. Hypotheses regarding its regional boundaries include: (i) an ecoregional boundary at Catoche Cape, dividing the Western Caribbean and the Southern GoMecoregions; and (ii) a boundary within the Southern GoM ecoregion at 89ºW, separating the West and Mid-Yucatan areas. We tested the hypothesis of no variation in benthic macrofaunal assemblages between regions delimited by the former boundaries using the species and functional traits of soft-bottom macrofauna. We considered that the depth and temporal environmental dynamics might interact with regional variations, generating complex benthic community patterns. The data were collected over fiveyears (2010–2012, 2015–2016) at 86 stations (N=1,017 samples, 10–270 m depth), comprising 1,327 species with 45 combinations of functional traits. The variation inspecies composition and functional trait assemblages were both consistent with the occurrence of three separate regions in the Yucatan Peninsula (West Yucatan, Mid-Yucatan and Western Caribbean). This regional configuration was consistent with changes in assemblage structure and depth zonation as well as temporal variation. Along with spatial and temporal variation, diversity diminished with depth and different regions exhibited contrasting patterns in this regard. Our results suggest that the spatialand temporal variation of soft-bottom macrofauna at YCS demonstrate the complex organization of a carbonate shelf encompassing different regions, which may represent transitional regions between the Caribbean and the GoM.


4.
Libro
Introduction to the physical and biological oceanography of shelf seas / John H. Simpson, Jonathan Sharples
Simpson, John ; Sharples, Jonathan (coaut.) ;
Cambridge : Cambridge University Press , 2012
Clasificación: 551.4618 / S5
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030007829 (Disponible)
Disponibles para prestamo: 1
Resumen en: Inglés |
Resumen en inglés

In this exciting and innovative textbook, two leading oceanographers bring together the fundamental physics and biology of the coastal ocean in a quantitative but accessible way for undergraduate and graduate students. Shelf sea processes are comprehensively explained from first principles using an integrated approach to oceanography that helps build a clear understanding of how shelf sea physics underpins key biological processes in these environmentally sensitive regions. Using many observational and model examples, worked problems and software tools, the authors explain the range of physical controls on primary biological production and shelf sea ecosystems. Boxes throughout the book present extra detail for each topic and non-mathematical summary points are provided for physics sections, allowing students to develop an intuitive understanding.


5.
- Artículo con arbitraje
Lumbrineridae (Polychaeta) from the Portuguese continental shelf (NE Atlantic) with the description of four new species
Martins, Roberto ; Carrera Parra, Luis Fernando (coaut.) ; Quintino, Víctor (coaut.) ; Rodrígues, Ana María (coaut.) ;
Contenido en: Zootaxa No. 3416 (2012), p. 1–21 ISSN: 1175-5326
Resumen en: Inglés |
Resumen en inglés

The present study reports four new species of the Family Lumbrineridae Schmarda, 1861, three in the genus Lumbrineris de Blainville, 1828 and one in the genus Gallardoneris Carrera-Parra, 2006. The new species were found on the Portuguese continental shelf at water depths ranging from 11 to 190 m. Gallardoneris iberica sp. nov. is the first record of this genus in the Atlantic Ocean and can be distinguished from the other two known Gallardoneris species by the distribution of the composite and the simple multidentate hooded hooks and the shape of the parapodial lobes. Lumbrineris luciliae sp. nov. has an arcuate, unidentate MIII and MIV unidentate with well-developed plate, digitiform wide basally postchaetal lobes in anterior parapodia, composite multidentate hooded hooks with short blade. Furthermore, L. luciliae sp. nov. has simple multidentate hooded hooks of two sizes, preacicular hook twice as big as postacicular hook, and distally curved aciculae in median and posterior parapodia. Both Lumbrineris lusitanica sp. nov. and Lumbrineris pinaster sp. nov. are characterized by having MIII unidentate followed by a knob. However, L. lusitanica sp. nov. has digitiform wide basally postchaetal lobes in the anterior parapodia, composite multidentate hooded hooks with short blade and simple multidentate hooded hooks with short hood; while L. pinaster sp. nov. has auricular postchaetal lobes in the anterior parapodia, composite multidentate hooded hooks with long blade, and simple multidentate hooded hooks with short and long hood. A multivariate analysis was performed upon morphological characteristics and validates the separation of the four new species. A taxonomic key to lumbrinerid species from Iberian waters is included.


6.
- Artículo con arbitraje
Detiding ADCP data in a highly variable shelf sea: the celtic sea
Carrillo Bibriezca, Laura Elena ; Souza, A. J. (coaut.) ; Hill, A. E. (coaut.) ; Brown, J. (coaut.) ; Fernand, L. (coaut.) ; Candela, J. (coaut.) ;
Clasificación: AR/577.64 / D4
Contenido en: Journal of Atmospheric and Oceanic Technology Vol. 22, no. 1 (January 2005), p. 94-97 ISSN: 1520-0426
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
ECO010018747 (Disponible)
Disponibles para prestamo: 1
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Resumen en: Inglés |
Resumen en inglés

This paper presents a comparison of two conventional detiding techniques carried out for ship-mounted acoustic Doppler current profiler (ADCP) data collected in the European shelf area of the Celtic Sea during the summer of 1998. One technique consisted of extracting the vertically averaged tidal currents obtained from a barotropic three-dimensional numerical tidal model. The second technique consisted of fitting the spatiotemporal ADCP data using least squares and polynomial spatial functions. In the least squares technique, the incorporation of zero velocity normal to the coast appears to improve the estimation of the tidal currents near the coast. Quantitative comparisons of the results from both techniques with historical current meter observations are shown. However, both methods showed limitations in accurately representing the tidal currents in the study area. Consequently, an alternative detiding technique is proposed. This technique consists of blending the tidal currents derived from the numerical model with those fitted to the ADCP data from the least squares method. Improved results were obtained using the blending technique. ADCP-derived residual currents were comparable with contemporaneous flows measured using drifting buoys and also with estimates obtained by geostrophic calculations.


7.
Artículo
*En hemeroteca, SIBE-San Cristóbal, SIBE-Villahermosa, SIBE-Campeche
Caracterización geomorfológica del talud y la plataforma continentales de Campeche-Yucatán, México
Mendoza, Manuel E. ; Ortiz Pérez, Mario Arturo (coaut.) (1943-2016) ;
Contenido en: Investigaciones Geográficas No. 43 (diciembre 2000), p. 7-31 ISSN: 2448-7279
Cerrar
SIBE Campeche
B3389 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
B3328 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE Villahermosa
B1572 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal, SIBE-Villahermosa, SIBE-Campeche
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Resumen en: Español | Inglés |
Resumen en español

Este trabajo incorpora métodos y técnicas de análisis cartográfico y geornorfológíco terrestres y marinas, especialmente geológicas y geofísicas, con la intención de determinar las características morfológicas de la margen continental del sureste del Golfo de México. El análisis cartográfíco-geomorfológico integra la información de los componentes del paisaje submarino, mediante el apoyo de un sistema de información geográfica (SIG). Se digitizaron las isobatas de tres cartas batimétricas en escala 1:200 000 y se interpolaron 7 000 datos batimétricos correspondientes a la porción de la Plataforma Campeche-Yucatán, de la cual no existía ninguna cartografía a escala semidetallada, construyéndose por tal motivo un mapa batimétrico en escala 1:250 000. Con base en este mapa se realizaron la cartografía morfométrica (mapa de pendientes e hipsométrico) y los Modelos Digitales de Terreno (MOT) que, junto con los ecogramas levantados durante los cruceros en el área en estudio, permitieron definir un estilo tectónico tensional que se presenta en la carta de Morfolineamíentos, así como identificar las cinco unidades principales y las siete unidades secundarias de relieve en la carta Morfogenétíca de la porción sureste del Golfo de México.

Resumen en inglés

This paper uses cartographic and terrestrial geomorphologie techniques linked to marine geologic techniques in order to analyze morphological features of the continental margin in the southeastern Gulf of Mexico. The cartographic-geomorphological analysis integrates information from components of the underwater landscape and was carried out through a Geographical Information System (GIS). Isobaths from three different bathymetrie charts, scale 1:200 000, were digitized and interpolated. About 7 000 bathymetrie records located in the Campeche-Yucatán continental shelf were interpolated for areas without cartographic references. Finally, a map at a 1:250 000 scale was obtained. Based on this map, morphometric charts (slopes and hypsometric) and Land Digital Models (LDM) were obtained. These, along with ecograms produced during cruises in the study area, allowed to define a tensional techtonic style showed in the resulting cartography. Five major and seven secondary morphogenetic units were identified in the Southern portion of the Gulf of Mexico.