Términos relacionados

23 resultados encontrados para: AUTOR: Pech Pool, Daniel Guadalupe
  • «
  • 1 de 3
  • »
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.


PDF
Resumen en: Inglés |
Resumen en inglés

The southern Gulf of Mexico (sGoM) is highly susceptible to receiving environmental impacts due to the recent increase in oil-related activities. In this study, we assessed the changes in the bacterioplankton community structure caused by a simulated oil spill at mesocosms scale. The 16S rRNA gene sequencing analysis indicated that the initial bacterial community was mainly represented by Gamma-proteobacteria, Alpha-proteobacteria, Flavobacteriia, and Cyanobacteria. The hydrocarbon degradation activity, measured as the number of culturable hydrocarbonoclastic bacteria (CHB) and by the copy number of the alkB gene, was relatively low at the beginning of the experiment. However, after four days, the hydrocarbonoclastic activity reached its maximum values and was accompanied by increases in the relative abundance of the well-known hydrocarbonoclastic Alteromonas. At the end of the experiment, the diversity was restored to similar values as those observed in the initial time, although the community structure and composition were clearly di erent, where Marivita, Pseudohongiella, and Oleibacter were detected to have di erential abundances on days eight–14. These changes were related with total nitrogen (p value = 0.030 and r² = 0.22) and polycyclic aromatic hydrocarbons (p value = 0.048 and r² = 0.25), according to PERMANOVA. The results of this study contribute to the understanding of the potential response of the bacterioplankton from sGoM to crude oil spills.


PDF PDF
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.


4.
Artículo
*Solicítelo con su bibliotecario/a
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
Nota: Solicítelo con su bibliotecario/a
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.


5.
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
PDF
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.


6.
Artículo
A dataset on the species composition of amphipods (Crustacea) in a Mexican marine national park: Alacranes Reef, Yucatan
Paz Ríos, Carlos Enrique ; Simões, Nuno (coaut.) ; Pech Pool, Daniel Guadalupe (coaut.) ;
Contenido en: Biodiversity Data Journal No. 6, e22622 (Jan 2018), p. 1-11 ISSN: 1314-2828
PDF PDF
Resumen en: Inglés |
Resumen en inglés

Alacranes Reef was declared as a National Marine Park in 1994. Since then, many efforts have been made to inventory its biodiversity. However, groups such as amphipods have been underestimated or not considered when benthic invertebrates were inventoried. Here we present a dataset that contributes to the knowledge of benthic amphipods (Crustacea, Peracarida) from the inner lagoon habitats from the Alacranes Reef National Park, the largest coral reef ecosystem in the Gulf of Mexico. The dataset contains information on records collected from 2009 to 2011. Data are available through Global Biodiversity Information Facility (GBIF).


7.
Capítulo de libro - Memoria en libro con arbitraje
Distribución espacial y temporal del carbono inorgánico disuelto en la Plataforma de Yucatán
Barranco Servin, Linda Margarita (autora) ; Hernández Ayón, J. Martín (autor) ; Aguilar Trujillo, Ana (autora) ; Herrera, Jorge (autor) ; Pech Pool, Daniel Guadalupe (autor) ;
Disponible en línea
Contenido en: Estado actual del conocimiento del ciclo del carbono y sus interacciones en México: síntesis a 2018 Álamos, Sonora, México: Programa Mexicano del Carbono : Instituto Tecnológico de Sonora, 2018 páginas 294-298 ISBN:978-607-96490-6-7
PDF
Resumen en: Español | Inglés |
Resumen en español

En el contexto del cambio climático global y la acidificación oceánica es fundamental ampliar nuestro entendimiento sobre la dinámica del ciclo del carbono y los procesos que la regulan en diferentes ambientes; con este propósito el objetivo de este trabajo es presentar los primeros resultados de las variaciones espaciales en la concentración del CID en la Plataforma de Yucatán, como una primera aproximación al entendimiento de la dinámica del ciclo del carbono en esta zona. Se analizaron muestras discretas de agua de mar tomadas en dos cruceros oceanográficos realizados en noviembre del 2015 (Gomex 4) y agosto-septiembre 2016 (Gomex 5), a dos diferentes niveles de profundidad: superficie y fondo. Los resultados muestran dos escenarios generados a partir de las condiciones oceanográficas y ambientales prevalecientes: 1) una plataforma con mayores concentraciones de CID (de 2 097 – 2 490 µmol/kg) en un gradiente costa-océano con valores más altos asociados a la costa producto de la entrada de aguas subterráneas y el efecto de la presencia de los vientos “Nortes” (noviembre 2015), y 2) una plataforma homogénea con concentraciones bajas (de 2020 a 2170 µmol/kg) en un gradiente sutil este-oeste con valores más bajos provenientes del este, asociados a la advección de masas de agua proveniente del Caribe (agosto-septiembre 2016). Debido a que no existen estudios sobre la dinámica del CO2 sobre la Plataforma de Yucatán, este trabajo contribuye al establecimiento de una línea base para tratar de entender su papel dentro del ciclo del carbono y los procesos que lo determinan.

Resumen en inglés

In the context of global climate change and ocean acidification, it is essential to broaden our understanding of the dynamics of the carbon cycle and the processes that regulate it in different environments; With this purpose, the objective of this work is to present the first results of the spatial variations in the concentration of DIC in the Platform of Yucatan, as a first approximation to understand the dynamics of the carbon cycle in this area. Discrete samples of seawater taken from two oceanographic cruise ships in November 2015 (Gomex 4) and August-September 2016 (Gomex 5) were analyzed at two different depth levels: surface and bottom. The results show us two scenarios generated from the prevailing oceanographic and environmental conditions: 1) a platform with higher concentrations of DIC (2 097 – 2 490 µmol/kg) in a coastal-ocean gradient with higher values associated with the coast, as a result of the entry of groundwater and the effect of the presence of “Nortes” winds (November 2015), and 2) a homogeneous platform with lower concentrations (2020 a 2170 µmol/kg) in a subtle east-west gradient with lower values from the east, associated with the advection of water masses from the Caribbean (August-September 2016). Because there are no studies on the dynamics of CO2 on the Platform of Yucatan, this work contributes to the establishment of a baseline to try to understand its role within the carbon cycle and the processes that determine it.


8.
Tesis - Doctorado
PDF
Resumen en: Español |
Resumen en español

La presente investigación describe la diversidad y distribución espacio-temporal de la comunidad de anfípodos bentónicos de la plataforma continental de Yucatán, así como su relación biogeográfica con el Atlántico occidental tropical. Se revisó material biológico de cuatro campañas de muestreo (2009–2012), obteniendo información sobre la riqueza, abundancia, y composición de especies; también se obtuvo información de literatura y bases de datos en línea. El análisis de datos de 2009, de un ecosistema de arrecife (Alacranes), demostró que la comunidad de anfípodos se estructura en tres ensamblajes de especies en función del tipo de fondo (blando, duro y artificial), con valores altos de riqueza y abundancia de especies en hábitats de fondo duro y artificiales, respectivamente. El análisis de datos de 2010–2012, de hábitats de sustratos blandos en la plataforma continental, reveló tres ensamblajes de especies, Caribe Oeste, Yucatán Medio y Golfo Sureste, en dos escenarios hidrográficos (surgencia en 2010–2011 y no surgencia en 2012), siendo la temperatura, textura del sedimento, productividad primaria, y materia orgánica las características que mayor explicaron la variabilidad espacio-temporal en la estructura de la comunidad de anfípodos en la plataforma interior (<60 m). Finalmente, el análisis de la composición de especies del material revisado, literatura, y bases de datos permitió reconocer una elevada riqueza de anfípodos (201 spp.) respecto a otras regiones del Atlántico, y una distribución geográfica por provincia biogeográfica Caribeña y Caroliniana, confirmando que la diversidad de anfípodos de la plataforma de Yucatán está más relacionada con la Caribeña.

La evidencia generada demostró que los hábitats bentónicos de la plataforma de Yucatán permiten al grupo de los anfípodos ser muy diversos, con especies recientemente descubiertas para la ciencia, como Gammaropsis elvirae (descrita en la tesis) y otras potencialmente nuevas (en proceso de descripción), así como una fauna con afinidad tropical hacia la provincia Caribeña. La distribución de la composición de especies reflejó la influencia de factores ambientales temporalmente dominantes en la plataforma de Yucatán interior asociados con procesos hidrográficos de la surgencia, y espacialmente a los tipos de fondo y a las características de los sedimentos carbonatados en el gradiente geográfico longitudinal.


9.
Artículo
*Solicítelo con su bibliotecario/a
Gammaropsis elvirae sp. nov., a widely distributed amphipod (Amphipoda: Photidae) in the Yucatan Shelf, with ecological comments and a key for the genus in tropical America
Paz Ríos, Carlos Enrique (autor) ; Pech Pool, Daniel Guadalupe (autor) ;
Contenido en: Zootaxa Vol. 4555, no. 3 (Feb. 2019), p. 359–371 ISSN: 1175-5326
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

Gammaropsis elvirae sp. nov. is described and illustrated here, as a new species of the family Photidae Boeck, 1871, occurring on sites widely distributed in the soft-sediment habitats from the Yucatan shelf, southern Gulf of Mexico. This new species differs from all other congeners by a unique set of characteristics: lateral cephalic lobes rounded; outer lobes of lower lip with one cone on each lobe; gnathopod 1 propodus longer than carpus; gnathopod 2 propodus enlarged with small convoluted processes on posterior margin and palmar angle undefined; gnathopod 2 dactylus short, less than one half in length of propodus; dense setation on basis, carpus, and propodus of gnathopod 2; epimeral plates 1–3 rounded; inner ramus of uropods 1–3 longer than outer ramus; and telson emarginated. Ecological comments on spatial distribution and associated environmental variables are included, as well an identification key to the genus in tropical America.


10.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Species richness and spatial distribution of benthic amphipods (Crustacea: Peracarida) in the Alacranes Reef National Park, Gulf of Mexico
Paz Ríos, Carlos Enrique (autor) ; Simões, Nuno (autor) ; Pech Pool, Daniel Guadalupe (autor) ;
Disponible en línea
Contenido en: Marine Biodiversity Vol. 49, no. 2 (April 2019), p. 673–682 ISSN: 1867-1616
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

The diversity and distribution of benthic amphipods has been explored in the Alacranes Reef, which is the largest coral reef ecosystemin the Gulf of Mexico. New insights into species richness, spatial distribution and extension of geographical ranges are presented by using data from published records and field surveys. A total of 117 species have been recorded, 9 of which are potentially new to science, 39 of which have new geographical records, and 7 are non-indigenous and previously reported in the literature as potentially invasive. Based on the use of a species-richness indicator (Chao 2), the expected species number is 40% higher, up to 200 spp., when compared to the observed species richness. The spatial distribution of amphipods varied significantly as a function of habitat type, showing the highest richness values on coral patches and the major abundances on man-made structures, such as navigation buoys and fishing traps. Multivariate analyses suggested the distinction between three taxonomically diverse species assemblages that showed similar ecological affinities, i.e. those on: (1) soft-bottom environments, grouping bare substrata and seagrass beds habitats; (2) hard-bottom environments, grouping coral patch and reef wall habitats; and (3) artificial substrata. The results highlight the importance of this reef ecosystem for a high amphipod diversity, but it is susceptible to future modifications in the presence of non-indigenous species, potentially invasive, on artificial substrata.