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16 resultados encontrados para: AUTOR: Ocaña Borrego, Frank Alberto
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1.
Artículo
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Co-occurring factors affecting ghost crab density at four sandy beaches in the Mexican Caribbean
Ocaña Borrego, Frank Alberto (autor) ; De Jesús Navarrete, Alberto (autor) ; Hernández Arana, Héctor Abuid (autor) ;
Disponible en línea
Contenido en: Regional Studies in Marine Science Volume 36, artículo número 101310 (April 2020), p. 1-4 ISSN: 2352-4855
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Human pressure can cause a decrease in the abundance of beach macrofauna, especially supralittoral crustaceans. In studying the life history traits of supralittoral crustaceans, human impact and beach features (e.g. beach slope, grain size, swash width) are often considered separately. Ghost crabs are widely accepted as ecological indicators of beach quality and condition since their abundance decreases at disturbed beaches; moreover, ghost crabs can respond to natural drivers. This study aims to determine factors affecting the density of the ghost crab Ocypode quadrata in the Mexican Caribbean. We studied the spatiotemporal variation of the density of ghost crabs at two urbanized and two reference beaches by counting crab burrows on all beaches during six sampling periods. Our results indicate that physical features of the beach are significantly correlated with burrow density, and burrow density varies substantially between urbanized and reference beaches. The greater variation of burrow density accounted for beach disturbance, followed by beach morphodynamic features. Basedon these results, our study confirms that the ghost crab is a relevant biological indicator species andis useful for guiding beach management criteria in the Mexican Caribbean. Our findings demonstrate that temporal replications must be included when using ghost crabs as ecological indicators.


2.
- Artículo con arbitraje
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Abundance, distribution, and secondary production of the apple snail Pomacea flagellate (Say, 1829) in Bacalar Lake, a tropical karstic system in southern Mexico
De Jesús Navarrete, Alberto (autor) ; Ocaña Borrego, Frank Alberto (autor) ; Oliva Rivera, José Juan (autor) ; Jesús Carrillo, Rosa M. de (autor) ; Vargas Espósitos, Abel Abraham (autor) ;
Contenido en: Studies on Neotropical Fauna and Environment Vol. 54, no. 1 (2019), p. 1–9 ISSN: 1744-5140
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Resumen en: Inglés |
Resumen en inglés

Pomacea flagellata is a gastropod conspicuous in freshwater environments, and represents a fishing resource. To assess their abundance, distribution, and secondary production, monthly samplings were carried out in Bacalar Lake from June 2012 to May 2013 at 12 sampling sites. In each site, three random transects were marked parallel to the shore. All snails on transect were collected and shell length and wet weight measured. The highest density occurred in September (1.27 ind.m−²), lowest in October (0.47 ind.m−²). Shell lengths ranged from 2 to 56 mm, with recruitment in January–March. Growth parameters were L∞ 59.50 mm, K 0.65.year−¹; the lifetime span was 3 years. Average biomass reached 5.57 wet g.m−² and secondary production was 6.025 wet g.m−². year-¹ ; annual renewal rate P/B 1.08. Highest abundance and secondary production was contributed by individuals between 31 and 41 mm in length. A potential biomass of 25.06 tons of snails was estimated in the lake. Snail densities, secondary production, and turnover were very low during the year, indicating that it is not viable to consider a commercial catch without affecting the population. A ban of 10 years is proposed, and aquaculture practices of snails are recommended to recover the resource.


3.
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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 |
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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.


4.
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
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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.


5.
- Artículo con arbitraje
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Across-shore distribution of Ocypode quadrata burrows in relation to beach features and human disturbance
Ocaña Borrego, Frank Alberto (autor) ; De Jesús Navarrete, Alberto (autor) ; Hernández Arana, Héctor Abuid (autor) ;
Disponible en línea
Contenido en: Journal of Natural History Vol. 52, no. 33-34 (2018), p. 2185–2196 ISSN: 0022-2933
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Resumen en: Inglés |
Resumen en inglés

Spatial distribution patterns of the ghost crab Ocypode quadrata were analysed using different approaches at one disturbed and two preserved reflective sandy beaches of the Mexican Caribbean. We used spatial correlation analysis to describe the across-shore distribution of O. quadrata and their patch dynamics by beach and sampling time. In addition, we analysed the across-shore variability of habitat extent of O. quadrata (habitat envelope) and its relation to human disturbance and beach features. The spatial structure of burrow density was consistent through time, showing a bimodal distribution with very low abundance in the mid distribution range and a discrete increment of burrows to landward. Nonetheless, the size of patches varied temporally for the three beaches. Burrow size increased from seaward to landward. The location of the first burrow and the habitat envelope varied among sampling times and beaches. The location of the first burrow is mostly mediated by the swash climate, while the habitat envelope is mainly controlled by the level of human disturbance. Despite the low number of disturbed and control beaches, our results suggest that the habitat envelope could be included in future studies when using ghost crabs as indicators of human disturbance. Polynomial models and variographic analysis proved to be useful tools to describe the across-shore distribution and patch dynamics of the ghost crab.


6.
- Artículo con arbitraje
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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.


7.
- Artículo con arbitraje
Efectos del disturbio humano sobre la dinámica poblacional de Ocypode quadrata (Decapoda: Ocypodidae) en playas del Caribe mexicano
Ocaña Borrego, Frank Alberto ; De Jesús Navarrete, Alberto (coaut.) ; De Jesús Carrillo, Rosa María (coaut.) ; Oliva Rivera, José Juan (coaut.) ;
Contenido en: Revista de Biología Tropical Vol. 64, no. 4 (December 2016), p. 1-17 ISSN: 0034-7744
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Resumen en: Español | Inglés |
Resumen en español

El cangrejo fantasma Ocypode quadrata, tiene una alta relevancia ecológica en las playas del Atlántico occidental y se ha propuesto como un indicador del impacto humano sobre este ecosistema. Sin embargo, no se han evaluado los efectos del disturbio humano sobre su dinámica poblacional. En este trabajo se compara la abundancia, el crecimiento y la mortalidad de O. quadrata en dos playas perturbadas (Aventuras y Majahual) y dos playas conservadas (Xcacel y Puerto Ángel) de las costas del Caribe mexicano. Se realizaron nueve muestreos en cada playa (marzo/2013-noviembre/2014). Durante las primeras horas de la noche se recolectaron cangrejos, de forma manual por tres personas, en un área aproximada de 9 000 m². Los cangrejos fueron medidos, pesados y separados en tres grupos: jóvenes, hembras y machos. La mayor abundancia de cangrejos se encontró en las playas conservadas pero solo se observaron diferencias significativas entre Puerto Ángel y Majahual (Tukey, p<0.05). La proporción jóvenes adultos fue 1:1 en Xcacel y Aventuras. En Majahual se recolectó un mayor número de jóvenes que adultos y en Puerto Ángel el número de adultos triplicó el de jóvenes. La talla máxima para Aventuras, Xcacel, Majahual y Puerto Ángel fue de 27, 32, 25 y 30 mm, respectivamente. En las playas se encontraron entre dos y tres grupos de edades diferentes. En las cuatro playas se recolectaron individuos con tallas menores de 10 mm en casi todos los meses de muestreo, indicando que el reclutamiento es continuo durante todo el año. La relación entre la longitud y el peso del cangrejo fantasma fue isométrica en las playas mejor conservadas y alométrica negativa en las playas impactadas. Los cangrejos de Puerto Ángel mostraron mejor condición corporal que en el resto de las playas (Tukey, p<0.05). Los valores de K oscilaron entre 0.6-0.97/año y la L∞ entre 29.0-33.6 mm.

Los cangrejos en las dos playas conservadas mostraron mayores parámetros de crecimiento en comparación con las dos playas perturbadas. Los mayores valores de mortalidad se encontraron en Xcacel y Aventuras. En las playas perturbadas, la destrucción de las dunas, la limpieza mecánica y la remoción de materia orgánica, parecen ser las principales causas que conllevan a una baja abundancia de cangrejos, un menor crecimiento y una alta mortalidad. Sin embargo en las playas mejor conservadas, las relaciones biológicas parecen ser más importantes en regular la dinámica poblacional de esta especie. Estos resultados tienen relevancia desde el punto de vista de manejo de las playas arenosas, ya que el cangrejo fantasma es un buen indicador del disturbio humano y sus respuestas poblacionales son medibles y comparables.

Resumen en inglés

The ghost crab Ocypode quadrata is a relevant species in the Western Atlantic beaches, and has been proposed as an indicator of human impact in these ecosystems. Eventhough some studies have covered various aspects of its natural history, no evaluations on the effects of human disturbance on its population dynamics have been made. This work compared the abundance, growth, and mortality of O. quadrata in two disturbed beaches (Aventuras and Majahual) and two preserved beaches (Xcacel and Puerto Angel) from the Mexican Caribbean. For this, nine samplings were made on each beach (every two to three months) between March 2013 and November 2014. Crabs were collected manually by three people, during the night first hours and for one hour, and a total area of 9 000 m² per beach. The crabs were measured, weighed, and separated into three groups: juvenile, male and female; while abundance was estimated by the number of collected crabs, and growth parameters were estimated using length frequencies. A total of 1 047 crabs were sampled in the four beaches; a higher crab abundance was found in the preserved beaches, but significant differences were only found between Puerto Angel and Majahual (Tukey, p<0.05). The adultjuvenile ratio was 1:1 in Xcacel and Aventuras, while in Majahual, more juveniles than adults were collected; and Puerto Angel had more adults than the juveniles. The size structure at Xcacel ranged from 4-32 mm, but in the rest of the beaches the minimum size was 5 mm. The maximum size at Aventuras, Majahual and Puerto Angel were 27 mm, 25 mm and 30 mm, respectively. The modal progression analysis of length’s pooled data, revealed the presence of at least two groups of ages in all beaches.

For all beaches, individuals smaller than 10 mm length were collected in almost all sampling months, indicating a continuous recruitment throughout the year. The length-weight relationship of the ghost crab was found isometric in the two preserved beaches, and negative allometric at the two impacted beaches. Crabs from Puerto Angel showed the highest body condition (Tukey, p<0.05). K-values ranged from 0.6-0.97/year and L∞ from 29.0 mm to 33.6 mm with higher values for the two preserved beaches. The highest mortality values were found in Xcacel and Aventuras. In the disturbed beaches, the destruction of the dunes, the mechanical cleaning and the removal of organic matter, seem to be the main causes that lead to a low abundance of crabs, their slower growth and higher mortalities. However, in the best preserved beaches, biological interactions appear to be the most important aspects in regulating the population dynamics of this species. These results supported the information that the ghost crab is a good indicator of human disturbance, and its population changes were clearly measurable and comparable among protected and impacted beaches; these results are also relevant for the management of sandy beaches in the Mexican Caribbean.


8.
Artículo
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Resumen en: Español | Inglés |
Resumen en español

Pomacea flagellata es una especie de caracol de agua dulce nativo en el sureste de México. Sobre esta especie existen pocos estudios y en ninguno se han abordado aspectos de su reproducción. Este caracol ha sido explotado durante años en la laguna Bacalar y sus poblaciones han decrecido considerablemente, conllevando a la veda de su captura. Este trabajo se realizó con el objetivo de evaluar las variaciones temporales de la frecuencia de cópulas y la abundancia de masas de huevos de P. flagellata en la laguna de Bacalar, así como sus relaciones con la abundancia de los caracoles y con variables ambientales. Los muestreos fueron realizados durante tres temporadas: Lluvias (julio, agosto y septiembre 2012), Nortes (diciembre 2012, enero y febrero 2013) y Secas (marzo, abril y mayo 2013) en 12 estaciones a lo largo de la laguna de Bacalar. En cada estación, se recorrió un transecto de 100 m paralelo a la orilla y se contó el número de huevas frescas (color rosado) puestas sobre la vegetación, troncos, rocas o estructuras artificiales. En el agua se hicieron tres transectos de 50 x 2 m y en cada uno se contaron los caracoles y se registró el número de cópulas.

La densidad de caracoles mostró variaciones significativas entre temporadas, disminuyendo desde la temporada de Lluvias hasta la temporada de Secas. Entre los meses dentro de temporadas no se presentaron diferencias significativas (ANOVA, p>0.05). Durante toda la temporada de Lluvias se registraron cópulas con una frecuencia significativamente mayor que en Nortes, mientras en Secas no se registraron cópulas (Kruskal-Wallis, p˂0.05). La puesta de masas de huevos se extendió de julio a marzo. La densidad de huevas no presentó diferencias entre la temporadas de Lluvias y Nortes (2.72 masas/m y 2.93 masas/m, respectivamente), pero en Secas fue significativamente menor con un valor de 0.1 masas/m (H, p˂0.05). La frecuencia de cópulas se relacionó significativamente con la abundancia de caracoles (rs= 0.26; p<0.05) y con la temperatura del agua (rs= 0.34; p<0.05). La abundancia de masas de huevos se relaciona significativamente con la abundancia de individuos (rs= 0.46; p<0.05). De forma general se observó que la actividad reproductiva de P. flagellata en la laguna de Bacalar, está asociada a los meses más cálidos y con mayor precipitación. Este hallazgo es relevante para apoyar la gestión de este recurso en la región, de tal forma que para implementar alguna medida de manejo para esta especie, es necesario tener en cuenta que al menos se debe mantener una veda temporal durante la etapa reproductiva.

Resumen en inglés

The Apple snail Pomacea flagellate is native from Southeastern Mexico. Studios about this species are scarce and none has treated their reproduction. This freshwater snail has been exploited at Bacalar lagoon for many years leading to a significant decrease of their abundance. Because of that a permanent ban has decreed by the government. This work is aimed to assess the temporal variations of mating frequency and the abundance of egg clutches of P. flagellata at Bacalar lagoon, as well as their relation with snails density and environmental variables. Sampling were done during the three climatic seasons: rainy (July, August and Sepetember/2012), norths or cold fronts (December/2012 and January and February/ 2013) and dry (March, April and May/2013) in 12 sampling stations located along the lagoon. On each station a transect of 100 m length were set parallel to the edge of the lagoon, and the number of fresh egg clutches laid over vegetation, rocks or manmade structures, were counted. In the water, three 50 x 2 m transects were set and the number of snails were counted as well as the number of mating. Density of snails decreased from rainy season to dry season, with a significant lower value during the latter. There were no significant differences of snail abundance among months, nested in climatic seasons (ANOVA, p>0.05).

During rainy season the mating frequency was significantly higher than in norths, meanwhile in dry season no mating were registered (Kruskal-Wallis, p˂0.05). Eggs clutches appeared from July to March. Density of egg clutches presented no differences between rainy and north seasons (2.72 and 2.93 clutches.m-1, respectively), nonetheless during dry season abundance of egg masses was significantly lower (0.1 clutches.m-1) (H, p˂0.05). Mating frequency was related with snail abundance (rs=0.26; p<0.05) and water temperature (rs=0.34; p<0.05) and the abundance of egg masses is related with snail abundance (rs=0.46; p<0.05). In general, we observed that reproductive activity of P. flagellata at Bacalar lagoon is related with the warmer months and with higher rainfall. This finding is relevant to support the management of this resource in the region. When authorities decide to stop the permanent ban they must be aware that a temporal ban is necessary during the reproductive season.


9.
- Artículo con arbitraje
Reproducción de Pomacea flagellata (Mollusca: Ampullariidae) en la laguna de Bacalar, Quintana Roo, México
Oliva Rivera, José Juan ; Ocaña Borrego, Frank Alberto (coaut.) ; De Jesús Navarrete, Alberto (coaut.) ; Jesús Carrillo, Rosa M. de (coaut.) ; Vargas Espósitos, Abel Abraham (coaut.) ;
Contenido en: Revista de Biología Tropical Vol. 64, no. 4 (December 2016), p. 1643-1650 ISSN: 0034-7744
PDF
Resumen en: Español | Inglés |
Resumen en español

Pomacea flagellata es una especie de caracol de agua dulce nativo en el sureste de México. Sobre esta especie existen pocos estudios y en ninguno se han abordado aspectos de su reproducción. Este caracol ha sido explotado durante años en la laguna Bacalar y sus poblaciones han decrecido considerablemente, conllevando a la veda de su captura. Este trabajo se realizó con el objetivo de evaluar las variaciones temporales de la frecuencia de cópulas y la abundancia de masas de huevos de P. flagellata en la laguna de Bacalar, así como sus relaciones con la abundancia de los caracoles y con variables ambientales. Los muestreos fueron realizados durante tres temporadas: Lluvias (julio, agosto y septiembre 2012), Nortes (diciembre 2012, enero y febrero 2013) y Secas (marzo, abril y mayo 2013) en 12 estaciones a lo largo de la laguna de Bacalar. En cada estación, se recorrió un transecto de 100 m paralelo a la orilla y se contó el número de huevas frescas (color rosado) puestas sobre la vegetación, troncos, rocas o estructuras artificiales. En el agua se hicieron tres transectos de 50 x 2 m y en cada uno se contaron los caracoles y se registró el número de cópulas. La densidad de caracoles mostró variaciones significativas entre temporadas, disminuyendo desde la temporada de Lluvias hasta la temporada de Secas. Entre los meses dentro de temporadas no se presentaron diferencias significativas (ANOVA, p>0.05). Durante toda la temporada de Lluvias se registraron cópulas con una frecuencia significativamente mayor que en Nortes, mientras en Secas no se registraron cópulas (Kruskal-Wallis, p˂0.05). La puesta de masas de huevos se extendió de julio a marzo.

La densidad de huevas no presentó diferencias entre la temporadas de Lluvias y Nortes (2.72 masas/m y 2.93 masas/m, respectivamente), pero en Secas fue significativamente menor con un valor de 0.1 masas/m (H, p˂0.05). La frecuencia de cópulas se relacionó significativamente con la abundancia de caracoles (rs= 0.26; p<0.05) y con la temperatura del agua (rs= 0.34; p<0.05). La abundancia de masas de huevos se relaciona significativamente con la abundancia de individuos (rs= 0.46; p<0.05). De forma general se observó que la actividad reproductiva de P. flagellata en la laguna de Bacalar, está asociada a los meses más cálidos y con mayor precipitación. Este hallazgo es relevante para apoyar la gestión de este recurso en la región, de tal forma que para implementar alguna medida de manejo para esta especie, es necesario tener en cuenta que al menos se debe mantener una veda temporal durante la etapa reproductiva.

Resumen en inglés

The freshwater snail Pomacea flagellata is native from Southeastern Mexico. Studies about this species are scarce and none has treated their reproduction. This snail has been exploited at Bacalar lagoon for many years, leading to a significant decrease in their abundance and currently, a permanent ban was proposed by the government. This work aimed to assess the temporal variations of mating frequency and the abundance of egg clutches of P. flagellata at Bacalar lagoon, as well as their relation with snails density and environmental variables. Sampling was done during the three climatic seasons: Rainy (July, August and September/2012), North or Cold fronts (December/2012 and January and February/2013) and Dry (March, April and May/2013) in 12 sampling stations located along the Bacalar lagoon. On each station a transect of 100 m length was set parallel to the edge, and the number of fresh egg clutches (pink color) laid over vegetation, rocks or manmade structures, were counted. In the water, three 50 x 2 m transects were set and the number of snails were counted as well as the mating frequency. Density of snails varied significantly among seasons, decreasing from the rainy to the dry season. There were no significant differences of snail abundance among months, nested in climatic seasons (ANOVA, p>0.05). During the rainy season the mating frequency was significantly higher than in the Norths, meanwhile in the dry season no mating were registered (Kruskal-Wallis, p˂0.05). Eggs clutches appeared from July to March. Density of egg clutches presented no differences between the Rainy and the North seasons (2.72 and 2.93 clutches/m, respectively), nonetheless during the dry season abundance of egg masses was significantly lower (0.1 clutches/m) (H, p˂0.05).

Mating frequency was related with snail abundance (rs= 0.26; p<0.05) and water temperature (rs= 0.34; p<0.05) and the abundance of egg masses is related with snail abundance (rs= 0.46; p<0.05). In general, we observed that reproductive activity of P. flagellata at Bacalar lagoon is related with the warmer months and with higher rainfall. This finding is relevant to support the management of this resource in the region, so that to implement any management arrangement they must be aware that a temporal ban is necessary during the reproductive season at least.


10.
- Artículo con arbitraje
Abundance and relative growth of Donax denticulatus (Bivalvia: Donacidae) at Levisa Beach, Southeastern Cuba
Ocaña Borrego, Frank Alberto ; Cala de la Hera, Yuself Roberto (coaut.) ; Apín, Yanet C. (coaut.) ;
Contenido en: Revista de Ciencias Marinas y Costeras ISSN: 1659-455X
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Resumen en: Español | Inglés |
Resumen en español

Este trabajo fue realizado con el objetivo de describir la variación espacio-temporal de la abundancia, la estructura de tallas y la relación talla-peso de una población de Donax denticulatus en playa Levisa en la costa sur oriental de Cuba. Entre abril y septiembre de 2008, se recolectaron muestras mensuales en cuatro estaciones localizadas a lo largo de la playa; en cada estación se delimitaron tres estratos perpendiculares al límite inferior de la zona intermareal. En cada estrato se tomaron tres réplicas de muestras de sedimentos con un cilindro de PVC de 0.025 m2 de área y el sedimento fue tamizado posteriormente a través de una malla de 1 mm. La densidad media osciló entre 612.2 y 1366.7 ind. m-2 y no se encontraron diferencias entre los meses de muestreo, aunque sí existió diferencia de la densidad entre los estratos de la playa. Existe una asociación entre la abundancia de reclutas, jóvenes y adultos, y los diferentes estratos. La parte media de la zona intermareal mostró la mayor proporción de individuos, fundamentalmente jóvenes y adultos. Los histogramas mensuales de frecuencias de longitud de tallas mostraron que los reclutas aparecieron en abril y mayo. La relación longitud-peso mostró que existe una correlación significativa entre estas variables, pero el valor del coeficiente de alometría es diferente, considerando distintos estadios del ciclo de vida. Esta población tiene potencial para ser explotada, pero se deben tener en cuenta algunas medidas de manejo para asegurar su sostenibilidad.

Resumen en inglés

This paper is aimed at describing spatio-temporal variation in abundance, size structure and length-weight relationship of a Donax denticulatus population at Levisa Beach on the Southeastern coast of Cuba. From April to September 2008, monthly samples were collected from four stations located along the beach; three strata were established across the intertidal zone of each station. Three replicate sediment samples were collected from each stratum with a 0.025 m2 PVC corer and sieved with a 1 mm mesh. Mean density ranged from 612.2 to 1366.7 ind. m-2, and no differences were found among the sampled months but rather among strata. There is a relationship between the abundance of recruits, young and adults, and strata. The middle intertidal zone showed the highest proportion of individuals, mainly young and adults. Monthly length frequencies showed that recruits appeared in April and May. Length-weight relationship showed a significant correlation between these variables; however, the allometric coefficient value is different considering different life stages. This population shows potential to be exploited, but some management measures proposed in this paper must be taken into account to ensure sustainability.