En los años 2001 y 2005, se estudió la composición de las comunidades de octocorales y corales pétreos en el archipiélago de los Jardines de la Reina. Se analizó, en la comunidad de corales pétreos, la incidencia del blanqueamiento ocurrido en el 2005 en el Caribe. Para ello se establecieron doce estaciones de muestreo (siete en el arrecife frontal somero y cinco en el arrecife de cresta), en cada una de estas se estimó la densidad mediante el marco cuadrado de 1 m de lado. En el arrecife frontal somero se identificaron un total de 62 especies (26 de octocorales y 36 de corales), siendo las más abundantes: Pseudopterogorgia americana (2.4 colonias/m2), Eunicea flexuosa (1.1 colonias/m2), Siderastrea siderea (5.0 colonias/m2) y Agaricia agaricites (4.0 colonias/m2). En el arrecife de cresta se identificaron un total de 31 especies (13 de octocorales y 18 de corales), predominando: Briareum asbestinum (1.3 colonias/m2), Porites astreoides (2.5 colonias/m2) y Millepora complanata (1.0 colonias/m2). Las especies más sensibles al blanqueamiento fueron: A. agaricites , Millepora spp. y Montastraea annularis. En sentido general, dicho suceso tuvo una incidencia pobre sobre los corales pétreos. Es menester la ejecución de monitoreos al permitir ajustar los planes de manejo en función de los cambios que puedan ocurrir en la estructura de las comunidades bentónicas.ABSTRACT Octocoral and stony coral communities in the Jardines de la Reina archipelago (Cuba) were studied in 2001 and again in 2005. The incidence of the 2005 bleaching event in the Caribbean was analyzed in the stony coral community. Twelve sampling stations were established: seven in the shallow forereef and five in reef crests, with one square meter quadrants to estimate density. A total of 62 species (26 octocorals and 36 stony corals) were identified in the shallow forereef, including Pseudopterogorgia americana (2.4 colonies/m2), Eunicea flexuosa (1.1 colonies/m2), Siderastrea siderea (5.0 colonies/m2) and Agaricia agaricites (4.0 colonies/m2). In the reef crest, 31 species were identified (13 octocorals and 18 stony corals), with Briareum asbestinum (1.3 colonies/m2), Porites astreoides (2.5 colonies/m2) and Millepora complanata (1.0 colonies/m2) being the most abundant. The most sensitive species to bleaching were: A. agaricites, Millepora spp. and Montastraea annulariS. In general, this event showed a poor incidence with stony corals. Constant monitoring is necessary to adjust the management plan to the changes that may occur in the structure of the benthic communities.
Coral reefs are complex and biodiverse ecosystems that are undergoing significant change. Understanding reef composition and biodiversity at multiple spatial scales is necessary to track both large-scale and more subtle ecosystem changes. The Jardines de la Reina (JR) archipelago, located offshore of the island of Cuba, contains the largest marine protected area (MPA) in the Caribbean Sea but lacks multi-scale studies. In this contribution, we documented the diversity of scleractinian corals, octocorals, algae, and sponges across nested spatial scales spanning four orders of magnitude (10 1-10 5 m). In addition, we tested the hypothesis that species diversity followed a gradient along the ca. 200 km of reef tract. Across the archipelago, we examined benthic cover and species diversity within 255 photo-quadrats (25 × 25 cm) at 13 fore reef sites (two sampling locations per site, and 10 photo-quadrats per location). Small-scale (10 1 m) variability between photo-quadrats characterized the coral reef community structure in JR compared with local-(10 2 m) and mesoscale (10 4-10 5 m) variability. This finding suggests that biological processes (e.g., recruitment, competition) had primacy over hydrodynamics for driving the differences in reef community composition. However, the dominance of algae and low cover and diversity of scleractinian corals suggests the pervasive effects of global change on coral communities despite potential benefits provided by the MPA (e.g., oligotrophy and abundance of herbivores). There was no gradient of benthic community structure along the fore reef tract of JR; instead, a patchy distribution occurred in response to more subtle drivers acting at local scales. Overall, our multi-scale comparison was useful for differentiating the impacts of processes potentially impacting the JR reefs, thus providing important information to understand how reef communities are impacted by different environmental and anthropogenic stressors, and the potential benefits of MPAs.
RESUMENUna de las actividades que más se desarrolla en el Parque Nacional Jardines de la Reina (PNJR), ubicado al sur de las provincias de Sancti Spíritus, Ciego de Ávila y Camagüey, es el buceo autónomo. Sobre esta base se realizó un estudio acerca de la incidencia de dicha actividad sobre los arrecifes de esta región, específicamente, sobre los corales pétreos. Para ello se estudiaron 28 sitios, en 10 días, lo que permitió comparar zonas de alta, media, baja y sin intensidad de buceo en cuanto al porcentaje de cobertura viva de los corales, mediante 220 transectos lineales y con la observación de 51 buceadores. En los sitios con alta intensidad de buceo se identificaron 36 especies de corales, siendo las más abundantes: S. siderea, A. agaricites, P. astreoides, M. alcicornis y O. faveolata. De los 51 buceadores observados, 48 cometieron infracciones: contactos sobre los organismos, resuspensión de sedimentos, y en menor medida, daños mecánicos (rompimiento). Las gorgonias fueron los organismos más contactados, seguidas por los corales. La cantidad de toques por buceador en el PNJR fue de 5.8 toques/min. La capacidad de carga efectiva en el PNJR varió entre 15 y 35 buceadores/sitio/día. Se infiere que los sitios de buceo del PNJR, a pesar de la incidencia del buceo autónomo sobre ellos, no muestran deterioro. No obstante, se recomienda monitorear los organismos afectados para conocer con precisión su evolución ante las incidencias, así como cumplir con el número de buceadores/sitio/día que se sugiere en este estudio.Palabras claves: Buceo autónomo, corales pétreos, Parque Nacional Jardines de la Reina, capacidad de carga, incidencias del buceo. ABSTRACTScuba diving is one of the main activities in the Jardines de la Reina National Park (PNJR), located off the southern coast of Sancti Spiritus, Ciego de Avila and Camagüey provinces. This study was conducted to determine the effect of this activity on the coral reefs of the area, particularly on stony corals. A total of 28 sites were surveyed during a ten-day period. Areas with high, medium, and low diving intensity, as well as no diving were compared taking into account the percentage of stony coral cover. A total of 220 line transects were used and 51 divers were observed. In sites with high diving intensity, 36 species of stony corals were identified, mostly including S. siderea, A. agaricites, P. astreoides, M. alcicornis and O. faveolata. Of the 51 divers observed, 48 violated diving regulations such as making contact with the corals, sediment resuspension, and, to a lesser degree, mechanical damage (breaking of organisms). Gorgonians, followed by stony corals, were the most contacted organisms. The amount of touches per diver was 5.8 touches/minute. Effective carrying capacity in PNJR ranged from 15 to 35 divers/site/day. It is inferred that, in spite of the impact of scuba diving recorded on the surveyed sites, the sites showed no signs of deterioration. However, monitoring affected organisms to follow up post-damage evolution and complying with the numb...
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