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4 resultados encontrados para: AUTOR: Hernández Avila, Iván
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Spatial assessment of the vulnerability of benthic communities to multiple stressors in the Yucatan Continental Shelf, Gulf of Mexico
Ocaña Borrego, Frank Alberto (autor) ; Pech Pool, Daniel Guadalupe (autor) ; Simões, Nuno (autor) ; Hernández Avila, Iván (autor) ;
Contenido en: Ocean and Coastal Management Vol. 181, article number 104900 (November 2019), p. 1-9 ISSN: 0964-5691
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Resumen en: Inglés |
Resumen en inglés

Here, we show a spatially explicit assessment of the vulnerability of benthic communities from the Yucatan Continental Shelf (YCS) to multiple pressures: fishing activities, shipping traffic, storms and hurricanes, and marine acidification. The vulnerability index was obtained by combining benthic biological traits with exposure and sensitivity and recovery capacity; this was then represented in a spatially explicit model. Moreover, we estimated a cumulative vulnerability index using three different scenarios that were based on 1) equal weight for each vulnerability layer to each stressor, 2) results of expert consultation and 3) a linear reduction in the weight of the pressures. By comparing scenarios, the synergistic and antagonistic effects of the multiple stressors were determined. The main results showed that, independent of the considered scenario, approximately 90% of the YCS presented moderate to high vulnerability to cumulative pressures, while areas with high recovery and high potential impact on a particular stressor showed low or moderate vulnerability to the pressures. Meanwhile, areas classified as having medium impact levels and low recovery capacities of benthic fauna showed moderateto high vulnerability to the same threats. Our findings also showed that ship traffic and marine acidification were the threats that contributed to the greatest vulnerability. The paired comparison of scenarios allows for the identification of areas with higher probabilities of synergistic effects. No antagonistic effects were detected. Overall, our results constitute the first effort to understand the ecological status of the benthic communities of the YCS and their potential vulnerability to the multiple pressures they face.

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
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.

- Artículo con arbitraje
Resumen en: Inglés |
Resumen en inglés

Diversity patterns of the deep-sea megafauna in the Caribbean Basin and the Guiana ecoregion were analyzed in order to test the hypothesis of species richness variation as a function of depth and the hypothesis of non-differences between ecoregions by analyzing spatial patterns of five taxa and a merged assemblage. Collections of five taxa (corals, sea stars, sea urchins, sea lilies and gastropods) were obtained from seven oceanographic expeditions aboard the R/V Pillsbury at 310 stations between 60 and 7500 m depth. Data were sorted according to depth zones and ecoregions and were analyzed in order to estimate species richness, changes in species composition and distinction of β-diversity by species turnover or by nestedness. The observed patterns of diversity were consistent between taxa and their assemblage: Species richness increased from the continental shelf (60±200 m deep) to the slope (200±2000 m deep), followed by a decrease at the continental rise-abyssal zone. We detected marked changes in species composition according to depth ranges. Changes in species composition in relation to ecoregions were also detected. In general, the Caribbean Basin lacks important physical barriers, causing high deep-sea ecosystem connectivity; however, variation in composition could be related to changes in environmental conditions associated with productivity and/or continental influences.

Contribuciones de la ciencia al manejo costero integrado de la Bahía de Chetumal y su área de influencia / por: Francisco J. Rosado May, Rafael Romero Mayo y Alberto de Jesús Navarrete, (editores)
Encuentro Internacional sobre la Bahía de Chetumal y su Área de Influencia (2001) ; Rosado May, Francisco Javier (editor) ; Romero Mayo, Rafael Ignacio (editor) ; De Jesús Navarrete, Alberto (editor) ;
Chetumal, Quintana Roo, México : Universidad de Quintana Roo. Programa de Manejo Integrado de Recursos Costeros , 2002
Clasificación: Q/333.917160972 / E5/2
Bibliotecas: Chetumal , San Cristóbal
SIBE Chetumal
ECO030001001 (Disponible)
Disponibles para prestamo: 1
SIBE San Cristóbal
ECO010005496 (Disponible)
Disponibles para prestamo: 1