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10 resultados encontrados para: AUTOR: Cobián Rojas, Dorka
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Resumen en: Inglés |
Resumen en inglés

Marine protected areas (MPAs) conserve diversity and abundance of fish communities. According to the biotic resistance hypothesis, communities with higher diversity and abundance should resist invasions better. To test this idea, the presence of lionfish in two Caribbean MPAs was studied: Parque Nacional Guanahacabibes (PNG) in Cuba and Parque Nacional Arrecifes de Xcalak (PNAX) in Mexico. Selection of these MPAs was based on both their different levels of success with enforcement and different abundances of native fish, with a more abundant native fish fauna at PNG. Underwater visual censuses were used to evaluate both the native fish structure and composition and at the same time distribution and abundance of lionfish. The abundance of potential predators on lionfish was also measured to determine possible effects of lionfish on both the abundance and the size of its prey and competitors. Lionfish showed higher abundance and larger size in PNG compared to PNAX, even though its probable competitors and predators were also more abundant and larger in PNG. Prey abundance and size decreased after the invasion. No correlation was detected between potential predators and lionfish, which might indicate natural predation is not substantial. In PNAX, lower abundance of prey, potential competitors and predators can also be attributed to historical overfishing, but this did not provide an advantage to lionfish. Lionfish were less abundant and reached smaller sizes in PNAX compared to PNG. This work confirms the effectiveness of lionfish culling at PNAX, but does not support the biotic resistence hypothesis that native fish might have controlled this invasive species.


Resumen en español

El proyecto estudió los movimientos de peces entre el mar Caribe (áreas protegidas de Xcalak, México y Bacalar Chico, Belice) y la bahía de Chetumal/Corozal, también un área protegida (Santuario del Manatí), por marcado-recaptura, isótopos estables y parasitología, con énfasis en el macabí (Albula vulpes), un recurso valioso y vulnerable, así como en la palometa (Trachinotus falcatus), pargos (Lutjanus griseus, L. apodus), barracuda (Sphyraena barracuda), pez aguja (Strongylura notata), y otros. Se buscó no sólo una descripción de las migraciones estacionales, sino también cambios entre la situación actual y la de hace una década y media, para la cual se comparó con datos propios previos, tanto en el arrecife de Xcalak como en la bahía de Chetumal, con el fin de estimar los posibles efectos de la apertura de una comunicación directa con el mar a través del canal de Zaragoza. Al cabo de tres años de trabajo y unos 100 días efectivos en el campo, se marcaron cerca de 9000 ejemplares de macabí y palometa y se recuperaron casi 600 marcas, además de analizar isotópicamente más de 100 muestras de tejido. También se realizaron talleres con pescadores en ambos países, tanto para aprender de su conocimiento tradicional, como para colaborar en la recuperación de marcas y compartir los avances. Por último, se examinó también la aproximación de especies exóticas invasoras a la bahía, tanto desde el mar (pez león, Pterois volitans) como desde el río Hondo (pez diablo, Pterygoplichthys pardalis). Los resultados del proyecto, que siguen analizándose, confirman el grado de dependencia mutua de ambos ecosistemas, bahía y mar adyacente, a través de los movimientos de los peces, y se detallan en tesis, artículos y ponencias sobre macabí, barracuda, pargos, pez aguja, pez león, pez diablo, y los cambios de la ictiofauna en general desde 1995 a la fecha.


3.
- Artículo con arbitraje
Resumen en español

El pez león (Pterois volitans) invadió la región del Caribe y tiene el potencial de alterar la composición y estructura de las comunidades de peces en los arrecifes coralinos. El objetivo de este estudio fue analizar los índices de diversidad en las comunidades de peces nativos en sitios invadidos por el pez león en dos áreas marinas protegidas (AMP) del Caribe y compararlos con datos previos a la invasión. En ambas AMP, Parque Nacional Guanahacabibes (PNG) en el occidente de Cuba y Parque Nacional Arrecifes de Xcalak (PNAX) en el S de Quintana Roo, se realizaron censos visuales de las especies de peces en hábitats durante las épocas de seca y lluvia del 2013-2015. Se evaluaron nueve sitios, mediante conteos estacionarios. Se registró mayor riqueza de especies en el PNG (43.47±5.14) que en el PNAX (40.22±4.96). No se observaron diferencias entre épocas en ninguna de las AMP. El pez león se ubicó entre las especies más abundantes del PNG. La abundancia media en el PNG (0.76 ± 1.25) fue mayor a la registrada en el PNAX (0.19±0.46). La diversidad disminuyó después de la llegada del pez león en un solo sitio del PNG y en dos sitios del PNAX, pero al parecer estos resultados están más asociados al efecto de la pesca que a la presencia del pez león. A partir de los resultados y asumiendo que los cambios en las comunidades de peces por el pez león podrían no detectarse aún, recomendamos seguir los monitoreos de los descriptores comunitarios para detectar cambios futuros en las comunidades de peces.

Resumen en inglés

Lionfish (Pterois volitans) invaded the Caribbean region with the potential to alter the composition and structure of native coral reef fish communities. The objective of this study was to analyze the diversity indices of these fish communities potentially affected by lionfish predation and to compare with pre-invasion data. The study was undertaken in two Caribbean marine protected areas (MPAs): Guanahacabibes National Park (PNG) in W Cuba and Xcalak Reefs National Park (PNAX) in S Quintana Roo. We carried out visual censuses of fish species in reef habitats during the dry and rainy seasons of the period 2013-2015. For this, nine sites were defined and evaluated using stationary counts. Our results showed higher species richness (43.47 ± 5.14) and mean abundance (0.76 ± 1.25) in PNG than in PNAX (40.22 ± 4.96, 0.19 ± 0.46, respectively). Diversity decreased after the arrival of lionfish in a single site of PNG and in two sites of the PNAX, but apparently, these results are more related to the fishing activity effect than to the lionfish presence. Based on the results and assuming that changes in the native fish communities by lionfish may not yet be detected, we recommend to continue the monitoring community descriptions in order to detect future changes in native fish communities.


4.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Interdecadal trends in composition, density, size, and mean trophic level of fish species and guilds before and after coastal development in the Mexican Caribbean
Schmitter Soto, Juan Jacobo (autor) ; Aguilar Perera, Alfonso (coaut.) ; Cruz Martínez, Alicia (coaut.) ; Herrera Pavón, Roberto Luis (coaut.) ; Morales Aranda, Aura Aletse (coaut.) ; Cobián Rojas, Dorka (coaut.) ;
Contenido en: Biodiversity and Conservation Vol. 27, no. 2 (February 2018), p. 459-474 ISSN: 1572-9710
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

This study explores the possible influence of human coastal development (before and after) and protected area status (within and outside a marine protected area, MPA) on composition, density, and maximum size of fish species and guilds, including mean trophic level of the fish community, in four localities of the Yucatan Peninsula, Mexican Caribbean. Reef fish density, maximum length, species composition, and trophic guilds were recorded by SCUBA belt transects and stationary points in fore reef and lagoon reef areas at decadal intervals (1995–1998, 2006–2010, 2014–2015). Mean density of most species and guilds decreased significantly through the years, as also did mean trophic level of the fish community. Some fish species increased in length. Fish density for many species was larger outside than inside the MPA in 1995–1998; however, the difference tended to disappear in the more recent decades, which reflects either a positive effect of the MPA, or a detrimental effect of coastal development in the non-protected area. Nevertheless, the overall negative trends suggest a regional or global rather than a local cause.


5.
- Artículo con arbitraje
Resumen en: Inglés |
Resumen en inglés

This study assessed the coral reef condition of two marine protected areas in the Caribbean: Guanahacabibes National Park, Cuba, and Costa Occidental de Isla Mujeres-Punta Cancun-Punta Nizuc National Park, Mexico, in a two-year period. The analyzed indicators for corals were live coral cover, diameter and height of the colonies, ancient and recent mortalities and abundance of recruits, which were evaluated in quadrats of 1 m² . In addition, it was estimated the coverage by morphofunctional groups of macroalgae in 25 × 25 cm quadrats and the density of the Diadema antillarum urchin in 1 m² quadrats. The results showed differences between countries at broad spatial scales (hundreds of kilometers). Reefs of both MPAs seem to be in different stages of changes, which have been associated with deterioration of Caribbean reefs, toward the dominance of more resistant, non-tridimensional coral species, causing a decrease of the reef complexity that may leads to the reefs to collapse. At scales of kilometers (within MPAs), a similar pattern was found in reefs of GNP-Cuba and different trends were observed in reefs of CNP-Mexico. The observed differences between CNP-Mexico sites appear to be associated with the current tourism use patterns.


6.
- Artículo con arbitraje
PDF
Resumen en: Inglés |
Resumen en inglés

In Caribbean reefs, the lionfish Pterois volitans is an invasive species that causes severe negative ecological effects, especially as this crepuscular predator consumes very diverse prey. Lionfish are not active during the day and stay in their refuges, sharing these spaces with various other fishes. The aim of this study is to determine which fishes are associated with the lionfish in their shelters, and what characteristics of both the invasive and native species may influence and explain such coexistence between a predator and its potential prey. Through diving and snorkelling, we visited 141 lionfish refuges, mostly caves, where we observed 204 lionfish and 494 other fish from 16 native species. We recorded species and abundance, as well as lionfish size and abundance. Half of the lionfish were observed in groups and the majority were large-sized. The association with most fish species seems fortuitous, but three species, Gramma loreto, Chromis cyanea and Canthigaster rostrata, were frequently observed in association with lionfish. Numerous fish juveniles, most likely Scarus coeruleus, were also observed together with the invasive predator. The more commonly associated fishes, particularly G. loreto, are mostly associated with large-sized lionfish that were found in groups. The associated fishes are also generally found in groups. Gramma loreto is a potential cleaner of the lionfish; the reasons for the association between these fish species and the invasive lionfish may be more complex than a simple predator-prey relationship and are discussed based on their biological traits and previously reported lionfish trophic ecology and predation behaviour.


Resumen en: Inglés |
Resumen en inglés

Knowledge of the current condition of reef communities is essential for the implementation of marine protected areas (MPAs). In 2014, we assessed the conditions of reefs of two MPAs in the Caribbean: Guanahacabibes National Park (Guanahacabibes), Cuba and Costa Occidental de Isla Mujeres - Punta Cancun - Punta Nizuc National Park (Cancun), Mexico. Within each of the two MPAs studied, we examined two reefs. We took data from fifteen 10-m long transect lines. Indicators included coral cover, diameter of coral colonies, old and recent coral mortalities and coral diseases. The abundance of coral recruits and the density of Diadema antillarum were assessed in 1 m2 quadrats. The cover of groups of macroalgae was obtained from 25 25 cm quadrats. Our data illuminated distinct stages in the loss of reef structure similar to what has been seen by other investigators, particularly the change in the dominance of coral species and the deterioration of the three-dimensional structure of reefs. The Cuevones site (in Cancun), which has been closed to tourism for fifteen years, remains dominated by corals, with a high coral cover (33.36%), but with a species dominance (principally Porites astreoides), different from the lead species observed in the Caribbean a few decades ago. The reefs of Guanahacabibes (Laberinto and Yemaya) subject to a low diving intensity appear to be at an earlier stage of changes than the Cancun reefs. The coral indicators remains similar to previous reports, so perhaps this can be slowed or reversed. Meanwhile, Manchones in Cancun showed the lowest coral cover (11.49%) and the lowest recruit density (0.6 recruits/m2), probably due to the joint action of the natural pressures and to the heavy influx of visitors these reefs receive.


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Resumen en: Inglés |
Resumen en inglés

The Indo-Pacific lionfish Pterois volitans is an invasive species that was first recorded in the Guanahacabibes National Park (GNP), a marine protected area in western Cuba, in 2009. In order to determine the invasion progression of this species, we studied lionfish abundance, size, and diet at 6 sites in the GNP between 2010 and 2014. The species’ density, biomass, and length increased over this period, probably due to the abundance of food and shelter in the GNP. Analysis of stomach contents indicated that lionfish fed primarily on fish and crustaceans; main prey were teleosts, predominantly Gobiidae, Pomacentridae, Mullidae, Labridae, Scaridae, and Grammatidae. This example of a rapid increase in an unmanaged population at the onset of invasion provides information that can be used to design a management program targeting lionfish.


9.
Tesis - Doctorado
Impacto potencial del pez león sobre la comunidad de peces en dos áreas marinas protegidas del Caribe (Cuba y México) / Dorka Cobián Rojas
Cobián Rojas, Dorka (autora) ; Schmitter Soto, Juan Jacobo (director) ; Aguilar Betancourt, Consuelo María (asesora) ; Aguilar Perera, Alfonso (asesor) ; Ruíz Zárate, Miguel Ángel (asesor) ;
Chetumal, Quintana Roo, México : El Colegio de la Frontera Sur , 2016
Clasificación: TE/597.68 / C6
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
ECO030008624 (Disponible)
Disponibles para prestamo: 1
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Índice | Resumen en: Español |
Resumen en español

Este estudio caracterizó la estructura comunitaria de peces arrecifales en los parques nacionales Guanahacabibes (PNG) en Cuba y Arrecifes de Xcalak (PNAX) en México después del establecimiento del pez león. Se realizaron censos visuales para determinar la estructura y composición de las principales especies presa, competidoras y depredadoras, a partir de la distribución y abundancia del pez león. Se analizó la dieta del pez león a través de estudios de contenido estomacal. El PNG presentó mayores abundancias y tallas de todas las especies presa, competidoras y depredadoras potenciales del pez león que el PNAX. La población de pez león se incrementó significativamente en el PNG, siendo mayor que la establecida en el PNAX. Se detectó que en la dieta del pez león dominaron los peces de las familias Gobiidae, Pomacentridae y Labridae. La diversidad, abundancia y biomasa de las comunidades de peces del PNG no mostraron diferencias respecto a la época. La abundancia fue mayor en secas en el PNAX. La época no influyó en la abundancia y talla del pez león en ambas AMP. En general, la abundancia y talla de las especies presa disminuyeron con el aumento de pez león, sobre todo en el PNG. Los depredadores potenciales no guardaron relación con el pez león en ambas AMP. Las diferencias en cuanto a riqueza, diversidad y equidad en las comunidades de peces en ambas AMP no se asociaron con el pez león. El pez león no es el único factor de impacto sobre los peces arrecifales del Caribe occidental y la hipótesis de resistencia biótica a las invasiones no aplica en éstas áreas.

Índice

I. Introducción General
Áreas marinas protegidas
Comunidades de peces y pez león
Parque Nacional Guanahacabibes
Parque Nacional Arrecifes de Xcalak
Justificación
Hipótesis
Objetivo General
Objetivos específicos
II. Density, size, biomass, and diet of lionfish in Guanahacabibes National Park, western Cuba
Introduction
Methods
Results
Discussion
Literature cited
III. Are there effects of lionfish on native reef fishes? A survey of two marine protected areas
Introduction
Methods
Results
Discussion
Conclusions
References
IV. Diversidad de las comunidades de peces en dos áreas marinas protegidas del Caribe y su relación con el pez león
Introducción
Materiales y Métodos
Resultados
Discusión
Literatura citada
Cuadros y figuras
V. Discusión
Conclusiones
VI. Literatura Citada
VII. Anexos


10.
- Artículo con arbitraje
The use of ISSR markers for species determination and a genetic study of the invasive lionfish in Guanahacabibes, Cuba
Labastida Estrada, Elizabeth ; Cobián Rojas, Dorka (coaut.) ; Hénaut, Yann (coaut.) ; García Rivas, María del Carmen (coaut.) ; Chevalier, Pedro P. (coaut.) ; Machkour M'Rabet, Salima (coaut.) ;
Contenido en: Latin American Journal of Aquatic Research Vol. 43, no. 5 (Nov. 2015), p. 1011-1018 ISSN: 0718-560X
Resumen en español

El pez león rojo (Pterois volitans) y el pez fuego diablo (Pterois miles) son especies invasoras que amenazan la biodiversidad y estabilidad de los arrecifes coralinos del Atlántico occidental, Golfo de México y Mar Caribe. La identificación del pez león sigue incierta en unas zonas de Cuba y la investigación se ha centrado principalmente en su biología y ecología. El propósito principal de este estudio fue determinar marcadores altamente polimórficos (secuencias repetidas inter simples, ISSR) útiles para estudios de genética poblacional del pez león y aplicarlos para determinar la especie de Pterois presente en el Parque Nacional Guanahacabibes. Se comparó el perfil genético de individuos colectados en México, formalmente identificados como P. volitans, con el perfil genético de especímenes de Cuba. Los perfiles genéticos mostraron un bajo número de “bandas diagnósticas” y un alto número de bandas comunes lo que demuestra que en ambos países está presente la misma especie. Por otra parte, los resultados de distancia genética de Nei y el árbol no enraizado no muestran ninguna diferencia significativa entre ambas localidades. Estos resultados confirman la presencia de P. volitans en el Parque Nacional Guanahacabibes, Cuba, y se demostró la funcionalidad de ISSR como herramienta molecular para la identificación de especies y su aplicación para estudios de genética poblacional de este pez invasor.

Resumen en inglés

The red lionfish (Pterois volitans) and devil fire-fish (Pterois miles) are invasive species that pose a threat to the biodiversity and stability of coral reefs in the Western Atlantic, Gulf of Mexico and Caribbean Sea. Species identification of lionfish is uncertain in some parts of Cuba, and research has mainly been focused on their biology and ecology. The principal aim of this study was to determine highly polymorphic markers (Inter Simple Sequence Repeat, ISSR) that could be used in research on lionfish population genetics in addition to confirming the presence of Pterois species in the Guanahacabibes National Park. The genetic profile or “fingerprint” of individuals collected in Mexico, formally identified as P. volitans, was compared with the genetic profile of specimens from Cuba. There were very few “diagnostic bands” and a high number of "common bands", demonstrating that the same species exists in both countries. Furthermore, Nei's genetic distance and the unrooted tree do not show significant differences between both localities. In light of these results, we can confirm the presence of P. volitans in the Guanahacabibes National Park, Cuba. This study demonstrates the functionality of ISSR as a molecular tool for species identification and their application for genetic population studies of this invasive fish species.