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25 resultados encontrados para: AUTOR: Herrera Silveira, Jorge Alfredo
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1.
Artículo
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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.


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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.


Resumen en: Inglés |
Resumen en inglés

Holbox Island is a contemporary hotspot for global tourism. Here, long-term coastal exploitation and increasing anthropogenic activities threaten coastal habitats and resources. The impact of these activities is exacerbated by the lack of a management plan for the past 24 years, until October 2018. An interdisciplinary approach that integrates fishers’ traditional knowledge was used to determine how small-scale fisheries (SSF) exploitation contributed to the decline of resources over time. Open interviews with community members and surveys of fishers’ perspectives on fisheries overexploitation and practices as well as knowledge of fishing sites were collected. Over one hundred fishing sites were documented that were once very productive. Furthermore, over 40 species were highly fished (e.g., Carcharhinidae, Shpyrnidae, Pristidae, Cheloniidae) over the past 50 years. Survey results allowed for the construction of maps with baseline information of coastal exploitation. Additional data from archaeozoological remains (n= 545) of aquatic fauna identified 33 families of exploited taxa, of which finfish (e.g., Haemulidaea, Ariidae, Serranidae), sharks (e.g., Carcharhinidae), and sea turtles were the most abundant. Fishers and literature sources (n= 50) document Holbox’s contemporary issues, including overfishing, illegal fishing, and accelerated tourism development. These types of data (fishers’ perspectives, interdisciplinary literature, and archaeozoological data) were combined using historical ecology techniques and geospatial tools to obtain novel baseline information on SSF exploitation. This information is essential for conservation managers and scientists to meet the management needs of Holbox’s natural and social capital, which can assure the future provision of coastal ecosystem services to humans.


4.
Capítulo de libro - Memoria en libro con arbitraje
Almacenes de carbono aéreo en manglares del caribe mexicano
Cinco Castro, S. (autor/a) ; Herrera Silveira, Jorge Alfredo (autor) ; Hernández Arana, Héctor Abuid (autor) ;
Disponible en línea
Contenido en: Estado actual del conocimiento del ciclo del carbono y sus interacciones en México: síntesis a 2018 / Fernando Paz, Alma Velázquez y Marlén Rojo, editores Álamos, Sonora, México: Programa Mexicano del Carbono : Instituto Tecnológico de Sonora, 2018 páginas 200-206 ISBN:978-607-96490-6-7
PDF
Resumen en: Español | Inglés |
Resumen en español

En la Península de Yucatán se encuentra más del 50% de los manglares de México, sin embargo, los de las costas del Mar Caribe son los más amenazados debido al desarrollo turístico al que se encuentran expuestos. Estos ecosistemas proveen servicios ambientales como la captura y almacén de carbono, por lo que contribuyen a mitigar algunos de los efectos del cambio climático. Debido a esto, el objetivo de este trabajo es estimar el carbono aéreo almacenado en los manglares de Puerto Morelos, Q. Roo. Se muestrearon las características hidrológicas y ecológicas en 44 parcelas distribuidas en la zona usando la metodología de Kauffman et al. (2013) para la estimación de carbono. Los resultados indican que el almacén de carbono aéreo promedio en los manglares de Puerto Morelos es de 52.6 ± 18.5 Mg C ha-¹, siendo el componente biomasa de árboles el que tiene un mayor aporte (77.3%). El conocimiento de los almacenes de carbono representa una herramienta básica para las medidas locales de mitigación del cambio climático global. Para disminuir la incertidumbre en estas estimaciones es necesario incrementar el esfuerzo de muestreo y/o tomar en cuenta metodologías geoestadísticas que permitan optimizar la información disponible.

Resumen en inglés

In Yucatan Peninsula, more than 50% of the mangroves in Mexico are found, however, those on the coasts of the Caribbean Sea are the most threatened due to the tourism development to which they are exposed. These ecosystems provide environmental services such as the capture and storage of carbon, so they contribute to mitigate some of the effects of climate change. Due to this, the objective of this work is to estimate the aboveground carbon stored in the mangroves of Puerto Morelos, Q. Roo. The hydrological and ecological characteristics were sampled in 44 plots distributed in the area using the Kauffman methodology for carbon estimation. The results indicate that the average aerial carbon storage in the mangroves of Puerto Morelos is 52.6 ± 18.5 Mg C ha-¹, with the biomass component of trees having the highest contribution (77.3%). Knowledge of carbon stores represents a basic tool for local measures to mitigate global climate change. To reduce the uncertainty in these estimates, it is necessary to increase the sampling effort and / or consider geostatistical methodologies that allow optimizing the available information.


5.
Tesis - Maestría
Análisis espectral de la frecuencia de inundación en manglares de Bahía de Chetumal, Q. Roo / Haydée López Adame
López Adame, Haydée (autora) ; Hernández Arana, Héctor Abuid (director) ; Herrera Silveira, Jorge Alfredo (asesor) ; Torrescano Valle, Nuria (asesora) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2016
Clasificación: TE/583.42097267 / L6
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030008655 (Disponible)
Disponibles para prestamo: 1
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Índice | Resumen en: Español |
Resumen en español

La dinámica hidrológica en los ecosistemas de manglar se expresa en las fluctuaciones del nivel de las inundaciones en escalas intra-anuales relacionadas a escalas estacionales, mensuales, diurnas y semi-diurnas. La hidrología local determina y modifica las propiedades físico-químicas del sustrato, lo que a su vez influye en los aspectos funcionales del ecosistema, como la productividad, la descomposición, la remineralización y las exportaciones de materia orgánica. El presente estudio tuvo como objetivo describir el hidroperiodo, la estructura forestal y la producción de hojarasca de dos manglares con diferencias estructurales e hidrológicas. Nuestro estudio se llevó a cabo en dos localidades (Rio Hondo y Tamalcab) con dinámica hidrológica contrastante y geomorfología en la Bahía de Chetumal (ChB), en la costa del noroeste del Caribe. Las características del hidroperiodo se utilizan para explicar los patrones estructurales y funcionales espacio-temporales del manglar. Basado en datos de series temporales de 29 meses de nivel de agua, marea, viento, precipitación y presión atmosférica. Realizamos un Análisis Espectral de Fourier de los componentes de variación de cada serie temporal y un análisis de espectro cruzado entre variables de nivel de inundación, atmosféricas y meteorológicas para identificar su relación. Se evaluó la estructura forestal en 2013 y 2015, en dos parcelas de 100 m2 cada una por localidad y estimamos el área basal, índice de complejidad e índice de valor de importancia para la descripción del bosque.

La productividad de la hojarasca se cuantificó para cada localidad en un período de tres años mediante la técnica de la canasta, cada muestra fue separada por especies, secada, ponderada y registrada, la productividad se expresa como peso seco promedio diario por área (g / 0.25 m2 / 7 día). La relación entre el componente de viento E-W y el nivel de inundación fue positiva con alta coherencia para ambos lugares. La inundación y marea de Río Hondo tuvo una relación positiva, con una variación compartida a 21 días de ciclo de alta coherencia y un retraso de tres días. Por el contrario, en Tamalcab, la inundación y la marea presentaron una relación negativa, con una variación compartida a 21 días de ciclos de coherencia y un retraso de diez días. La relación entre la presión atmosférica y el nivel de inundación fue negativa y de alta coherencia para ambos lugares. La estructura del bosque está dominada por R. mangle en ambos lugares en términos de índice de complejidad, índice de valor de importancia y productividad de la hojarasca. La productividad presenta un patrón estacional. La alta productividad de RH se produce durante la estación seca con algunos picos de productividad durante la temporada de lluvias. En Tamalcab la productividad más alta ocurre durante la temporada de lluvias. Los análisis de correlación entre tiempo inundado / agua saturada versus productividad promedio diaria de la hojarasca para ambos lugares mostraron una relación positiva significativa débil para RH, en Tamalcab tuvo una relación positiva significativa moderadamente. La relación entre el nivel de inundación, el régimen de mareas y el viento indicó que estos son los principales impulsores de las fluctuaciones de inundación y el tiempo de saturación de agua. La productividad se relacionó con el tiempo que el suelo permaneció inundado o saturado de agua.

Índice

Resumen
Introducción
Objetivos General
Objetivos particulares
Artículo entregado para revisión y publicación en Estuarine Coastal and Shelf Science
Spectral analysis of flooding frequency in mangroves and its relation with litterfall productivity
Abstract
1. Introduction
2. Methods
2.1 Study area
2.2 Data collection
2.3 Data analyses
3. Results
3.1 Spectral analysis
3.2 Cross spectral analysis 3.3 Mangrove interstitial salinity
3.4 Forest structure and litterfall productivity
3. 5 Relationship between water level as explanatory variable of litterfall productivity
4. Discussion
5. Conclusions
6. Acknowledgements
Conclusiones
Aspectos éticos en la investigación
Literatura citada


6.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Los peces como indicador de restauración de áreas de manglar en la costa norte de Yucatán
Arceo Carranza, Daniel ; Gamboa, Eric (coaut.) ; Teutli Hernández, Claudia (coaut.) ; Badillo Alemán, Maribel (coaut.) ; Herrera Silveira, Jorge Alfredo (coaut.) ;
Contenido en: Revista Mexicana de Biodiversidad Vol. 87, no. 2 (junio 2016), p. 489–496 ISSN: 1870-3453
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
57938-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
PDF
Resumen en: Español | Inglés |
Resumen en español

Los manglares son reconocidos por los servicios ecológicos que proveen a muchas especies de peces. Estudios previos sobre restauración ecológica han pasado por alto estas funciones, generalmente enfocándose a la restauración de cobertura vegetal. El objetivo fue determinar las funciones de los manglares como zonas de refugio y alimentación para peces, evaluando la composición y abundancia en sitios con diferente tiempo de restauración. Se realizaron 2 muestreos en 4 sitios de manglar en restauración en Yucatán —Celestún 1, Celestún 2, Yucalpetén, Progreso—, en donde se registraron 22 especies de peces. Celestún 2 fue el sitio con mayor riqueza y diversidad (Gambusia yucatana, Poecilia velifera, Mugil cephalus y Anchoa mitchilli las más abundantes). Progreso registró la diversidad más baja y alta dominancia de G. yucatana (> 90%). El sitio con mayor tiempo de restauración presentó organismos juveniles detritófagos y zoobentófagos. Los resultados demuestran la función del manglar como zona de crianza y alimentación para especies marinas que intervienen en la transferencia de energía y nutrientes con sistemas adyacentes, también demuestran gran dominancia de G. yucatana, una especie endémica y característica del ecosistema de manglar en Yucatán.

Resumen en inglés

Mangroves are well recognized for the ecological services that they provide to many fish species. Previous studies on ecological restoration have overlooked these ecological functions, as they are generally focused on the restoration of vegetation cover. The objective of this study is to determine the function of mangroves as nursery and feeding grounds for fishes, by assessing the species composition and abundance in sites with different restoration time. Two samplings were performed in 4 sites where mangrove is recovering along the Yucatán coast —Celestún 1, Celestún 2, Yucalpetén, Progreso—. A total of 22 fish species were recorded, the higher richness and diversity were recorded in Celestún 2 (Gambusia yucatana, Poecilia velifera, Mugil cephalus and Anchoa mitchilli were the most abundant). In Progreso, the diversity was lower due to the dominance of G. yucatana (> 90%). The site with the longest restoration time presented juveniles of detritophagous and zoobentophagous species, which show the nursery and feeding functions of the area. These marine species are involved in the transfer of energy and nutrients to adjacent systems, also a great dominance of G. yucatana was found, which is an endemic and characteristic fish species from the mangrove ecosystem in Yucatán.


7.
- Capítulo de libro con arbitraje
Resumen en: Inglés |
Resumen en inglés

Understanding the processes and mechanisms that determine coastal connectivity may help us to propose and establish more effective strategies for maintaining the environmental goods and services from coastal ecosystems. The eastern Yucatán Peninsula, from inland to sea range from: karstic freshwater lakes, brackish lagoons, estuarine coastal lagoons to reef lagoons. These ecosystems coalesced to form the largest and complex coastal ecosystems of the Yucatán Peninsula. The spatio-temporal structure of this complex ecosystem can be used as a model system to study connectivity processes through its hydrological, biogeochemical and ecological interactions. Based on its structure we propose a conceptual model, which we call the “Transverse Coastal Corridor” as a meaningful strategy for research, coastal development and conservation in the southeastern Yucatán Peninsula. The corridor includes the second largest freshwater karstic lake in Mexico, Laguna Bacalar; the largest estuarine-coastal lagoon, Chetumal Bay, the largest extant freshwater microbialite ecosystem and the structurally most complex coral reef ecosystem of the Mesoamerican Barrier Reef System. Physical, chemical and biological exchanges and interactions across the corridor of terrestrial, freshwater, marine environments drive a diverse and complex set of ecological processes that determine biodiversity and ecosystem functioning. We consider that the conceptual model of The Transverse Coastal Corridor may be more appealing to the different actors involved in the regional scale as it recognizes the particular biological and ecological characteristics of the interrelated ecosystems by seeking a balance from protection, management efforts, and sustainable use of the natural resources whilst preserving ecosystem functioning.


8.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Seasonal changes in epiphytic dinoflagellate assemblages near the northern coast of the Yucatan Peninsula, Gulf of Mexico
Okolodkov, Yuri B. ; Merino Virgilio, F. C. (coaut.) ; Aké-Castillo, J. A. (coaut.) ; Aguilar-Trujillo, A. C. (coaut.) ; Espinosa-Matías, S. (coaut.) ; Herrera Silveira, Jorge Alfredo (coaut.) ;
Contenido en: Acta Botánica Mexicana No. 107 (abril 2014), p. 121-151 ISSN: 0187-7151
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
53628-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
PDF
Resumen en: Español | Inglés |
Resumen en español

Se estudió a los dinoflagelados epífitos en 250 muestras de 10 sitios en Chelem (una laguna rodeada parcialmente por manglar) y Dzilam de Bravo (una localidad costera expuesta), en la costa norte de la Península de Yucatán, obtenidas durante cinco exploraciones en 2008-2009. Se midió la temperatura, salinidad, turbidez, pH, oxígeno disuelto, nitratos, nitritos, fosfatos, silicatos, urea, clorofila-a extraída de la columna de agua, precipitación, así como velocidad y dirección del viento. El sistema de la laguna de Chelem reveló menor variabilidad de las características físico-químicas comparado con la localidad expuesta de Dzilam de Bravo. Los dinoflagelados se encontraron asociados con todos los macrófitos hospederos incluyendo cuatro especies de pastos marinos y 33 de macroalgas representantes de 24 géneros. Un total de 20 taxa de dinoflagelados correspondientes a 12 géneros se obtuvieron de estos sustratos. El género Prorocentrum incluyó la mayor cantidad de especies. La variación en la abundancia promedio de dinoflagelados epifíticos en ambas localidades osciló entre ~200 y 3500 células g-1 de peso húmedo de sustrato. La abundancia de células en los sitios, en contraste, varió entre ~100 y >25 000 células g-1. Esta variación es típica de la distribución en parches de estas especies en el tiempo y el espacio. En general,Prorocentrum rhathymum (máximo 2.41×104 células g-1) fue la especie más abundante en las muestras. Otras especies abundantes fueron Bysmatrum caponii (máximo 1.19×104 células g-1) y Amphidinium cf. carterae (máximo 3.69×103 células g-1).

La abundancia máxima de Gambierdiscus spp. se presentó en mayo y noviembre (9.90x103 células g-1) en Chelem cuando la temperatura varió de 24.5 a 30.2 °C. Los datos obtenidos muestran que el mayor potencial para el flujo de ciguatoxinas a través de la red trófica puede encontrarse en ambientes protegidos de turbulencia baja, donde la salinidad es alta, los nutrientes abundantes y la temperatura de agua entre 24 y 31 °C.

Resumen en inglés

Epiphytic dinoflagellates were studied in 250 samples from 10 sites in Chelem (a semi-enclosed mangrove lagoon) and Dzilam de Bravo (an exposed coastal locality), on the northern coast of the Yucatan Peninsula, during five surveys in 2008-2009. Temperature, salinity, turbidity, pH, dissolved oxygen, nitrates, nitrites, phosphates, silicates, urea, extractable water column chlorophyll-a, precipitation, and wind speed and direction were measured. The Chelem lagoon system showed minor variability in physical-chemical characteristics compared to the exposed site at Dzilam de Bravo. Dinoflagellates were associated with all the host macrophytes examined including four seagrass species and 33 macroalgal species representing 24 genera. A total of 20 dinoflagellate taxa from 12 genera were recovered from these substrates. The genus Prorocentrum contained the largest number of individual species. The variation in mean epiphytic dinoflagellate abundance over both localities ranged from ~200 to 3500 cells g-1 substrate wet weight. Cell abundances at individual sites, in contrast, ranged from ~100 to >25 000 cells g-1 substrate wet weight. This variation is typical of the patchy distribution of these species in time and space. Overall, Prorocentrum rhathymum (up to 2.41×104 cells g-1) was the most abundant species observed across samples. Other abundant species were Bysmatrum caponii (maximum of 1.19×104 cells g-1) and Amphidinium cf. carterae (maximum of 3.69×103 cells g-1). The highest abundances of Gambierdiscus speciesoccurred in May and November (9.90x103 cells g-1) in Chelem when temperatures ranged from 24.5 to 30.2 oC. The data obtained indicate that the greatest potential for ciguatoxin flux into the food web may occur in protected, low turbulence environments, where salinities are high, nutrients abundant, and water temperatures are between 24 and 31 °C.


9.
- Artículo con arbitraje
*En hemeroteca, SIBE-San Cristóbal
Drivers of mangrove litterfall within a karstic region affected by frequent hurricanes
Adame, María F. ; Zaldívar Jiménez, Arturo (coaut.) ; Teutli, Claudia (coaut.) ; Caamal, Juan P. (coaut.) ; Anduez, María T. (coaut.) ; López Adame, Haydée (coaut.) ; Cano, Romel (coaut.) ; Hernández Arana, Héctor Abuid (coaut.) ; Torres Lara, Ricardo (coaut.) ; Herrera Silveira, Jorge Alfredo (coaut.) ;
Contenido en: Biotropica Vol. 45, no. 2 (March 2013), p. 147–154 ISSN: 0006-3606
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
35840-20 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

Tropical storms can shape the structure and productivity of mangrove forests. In this study, we compared current litterfall with historical tropical storm disturbance in the karstic Yucatan Peninsula (YP). We also explored the relationship between litterfall and the fresh/seawater mixture of floodwater. Our hypotheses were that litterfall peaks at moderate perturbations and in sites where seawater dominates the floodwater mixture, and thus, where soil total phosphorus (TP) is relatively high. Litterfall was sampled for 2 yr, from eight mangrove forests around the YP. At each site, forest structure, interstitial salinity, TP, nitrogen, carbon, pH, and bulk density were measured. Our results show that mangrove forest from northeast YP are historically impacted by stronger and more frequent tropical storms compared with those in northwest and southeast YP, where tropical storm intensity is moderate and mild, respectively. Litterfall was higher in northwest YP ( 3 g/m2 d) compared with northeast and southeast ( 2 g/m2 d), mimicking a subsidy-stress gradient where highest productivity is reached at moderate perturbations. Neither salinity nor forest structure alone satisfactorily explained litterfall variability. Soil TP followed a similar geographical pattern as the disturbance gradient: highest concentrations in the northwest YP ( 0.05%) and lowest in the northeast and southeast ( 0.03%). Thus, it is likely that TP, and not tropical storm disturbance, is the main driver of litterfall in mangrove forests of the YP. Alterations in TP availability (e.g., sea level rise and aquifer contamination) have the potential to modify mangrove productivity in the region.


Resumen en: Inglés |
Resumen en inglés

The demonstration project on monitoring and environmental evaluation of the Gulf of Mexico Large Marine Ecosystem (GoM LME) aims to provide the basis for the joint monitoring of the Gulf of Mexico between the USA and Mexico. The project is roughly based on the National Coastal Condition (NCC) reported by the USEPA–NOAA–USGS and changes to the approach used in the USA have been adopted. It consists of five modules: Habitat degradation, water quality, sediment quality, fish, and benthic fauna. For each module different parameters are measured, and categorized as being in “good” (score of 5), “fair” (score of 3) or “poor” (score of 1) condition according to pre-determined criteria. The Coastal Condition Index is calculated as the mean of the scores for all modules. Results were presented to stakeholders and environmental managers as maps with color-coded “street lights” indicating the status of each sampling station and parameter. Terminos Lagoon in Mexico was exclusively used as a site for the demonstration study. We discuss the importance of adopting a bilateral (Mexico-US) transboundary monitoring strategy to assess the coastal condition of the GoM LME.