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Redalyc.Estructura Y Categorías Tróficas De Peces Asociados A Investigaciones Marinas ISSN: 0716-1069 [email protected] Pontificia Universidad Católica de Valparaíso Chile Allen, Thays; Jiménez, Máyré; Villafranca, Sioliz Estructura y categorías tróficas de peces asociados a praderas de Thalassia testudinum (Hydrocharitales, Hydrocharitaceae) en el golfo de Cariaco, Estado de Sucre, Venezuela Investigaciones Marinas, vol. 34, núm. 2, 2006, pp. 125-136 Pontificia Universidad Católica de Valparaíso Valparaíso, Chile Disponible en: http://www.redalyc.org/articulo.oa?id=45634212 Cómo citar el artículo Número completo Sistema de Información Científica Más información del artículo Red de Revistas Científicas de América Latina, el Caribe, España y Portugal Página de la revista en redalyc.org Proyecto académico sin fines de lucro, desarrollado bajo la iniciativa de acceso abierto Invest. Mar., Valparaíso, 34(2): 125-136,Peces 2006 de praderas Thalassia testudinum y su categoría trófica 125 Estructura y categorías tróficas de peces asociados a praderas de Thalassia testudinum (Hydrocharitales, Hydrocharitaceae) en el golfo de Cariaco, Estado de Sucre, Venezuela* Thays Allen1, Máyré Jiménez1 & Sioliz Villafranca1 1Universidad de Oriente, Núcleo de Sucre, Departamento de Biología Marina Instituto Oceanográfico de Venezuela, Avenida Universidad, Cerro Colorado Cumaná, Apartado Postal 245, Código Postal 6101, Estado de Sucre, Venezuela RESUMEN. Se analiza la estructura y categorías tróficas de la comunidad de peces asociados a praderas de Thalassia testudinum del golfo de Cariaco, Venezuela. Las capturas de peces se realizaron desde diciembre 1996 hasta noviembre 1997, utilizando una red tipo chinchorro. Se cuantificaron los individuos, se calculó la abundancia total de las especies, la riqueza específica total y la frecuencia de aparición. Se determinó la categoría trófica de cada especie, establecién- dose cinco categorías: carnívoros, herbívoros, omnívoros, planctívoros y detritívoros. Mediante un dendrograma se estableció el grado de similitud alimentaria entre las distintas especies y su categoría trófica. Se colectaron 15.509 peces pertenecientes a 27 familias y 44 especies. Se determinaron 23 especies carnívoras (57%), ocho omnívoras (20%), cinco planctívoras (13%), dos herbívoras y dos detrítivoras (5%). De las especies carnívoras se identificaron 12 especies de escasa presencia. Las únicas especies herbívoras fueron Nicholsina usta y Sparisoma radiams. El dendrograma mostró dos grupos principales, el grupo A formado por especies omnívoras y carnívoras y el grupo B, conformado por especies detritívoras, herbívoras y planctívoras. Palabras clave: peces, Thalassia testudinum, categoría trófica, Caribe, Venezuela. Trophic structure and categories of fish associated with Thalassia testudinum meadows (Hydrocharitales, Hydrocharitaceae) in Golfo de Cariaco, Estado de Sucre, Venezuela* ABSTRACT. The trophic structure and categories of the fish community associated with Thalassia testudinum meadows in the Golfo de Cariaco, Venezuela, were analyzed. The fish were caught from December 1996 through November 1997, using a seine-type net. Specimens were quantified and the total species abundance, total species richness, and frequency of appearance were calculated. Each species was placed into one of five trophic categories: carnivorous, herbivorous, omnivorous, planktivorous, and detritivorous. A dendrogram was used to establish the degree of similarity in food between the different species and trophic categories. The 15,509 fish collected belonged to 27 families and 44 species. Of these, 23 species were found to be carnivorous (57%), eight omnivorous (20%), five planktivorous (13%), two herbivorous, and two detritivorous (5%). Twelve of the carnivorous species were scarce. The only herbivorous species were Nicholsina usta and Sparisoma radiams. The dendrogram showed two main groups: group A, made up of omnivorous and carnivorous species and group B, consisting of detrivorous, herbivorous, and planktivorous species. Key words: fish, Thalassia testudinum, trophic category, Caribbean, Venezuela. Autor corresponsal: Thays Allen ([email protected]) * Trabajo presentado en el XXV Congreso de Ciencias del Mar de Chile y XI Congreso Latinoamericano de Ciencias del Mar (COLACMAR), realizados en Viña del Mar, entre el 16 y 20 de mayo de 2005. 126 Investigaciones Marinas, Vol. 34(2) 2006 INTRODUCCIÓN mentación es primordial para la elección del hábitat por los peces y constituye un aspecto importante de La fanerógama marina Thalassia testudinum confor- su actividad diaria. La particularidad de los peces ma mosaicos de parches vegetados y sustratos libres en los patrones de alimentación viene dado por la (Bologna & Heck, 2000), constituyendo áreas de alta locomoción, tipo, distribución, espacio y talla de la productividad (McRoy & Macmillan, 1977; Thayer fanerógama, y distribución de la presa. Sin embargo, et al., 1984), siendo la fanerógama más abundante la locomoción muchas veces podría restringir el ac- y característica del Caribe (Dawes, 1986). Entre sus ceso a varios hábitats y microhábitats modificando el funciones más sobresalientes está evitar la erosión de éxito en la captura de la presa (Fulton & Bellwood, las costas, contribuir al enriquecimiento del ambiente 2002). Para los peces herbívoros su alimentación donde habita, formando zonas de protección y crianza aparentemente depende de la disrupción de las pa- para invertebrados y peces, estabiliza el fondo marino redes celulares de los vegetales que consume. Los y representa un área de alimentación para diversos peces herbívoros que consumen hojas de faneróga- organismos (Randall, 1965; Thayer et al., 1984; mas muchas veces pastorean sus epífitas y solo una Vargas-Maldonado & Yáñez-Arancibia, 1987). pequeña parte de la hoja de Thalassia es utilizada El valor de las praderas de fanerógamas como (Thayer et al., 1984). fuente de alimento está dado por su disponibilidad, En el mar Caribe, se han realizado varios estu- distribución, abundancia, morfología, producción dios sobre la estructura de comunidades de peces en y composición química. Estas praderas tienen un praderas de fanerógamas y sus relaciones tróficas contenido relativamente alto en minerales y otros (Randall, 1965, 1967; Greenway, 1976, 1995; Ogden, nutrientes, contenido que varía dependiendo de la 1976, 1980; Heck & Orth, 1980; Lobel & Ogden, parte de la planta, edad, estación y grado de epifitismo 1981; Guevara-Carrió et al., 1994). En Venezuela, es- (Thayer et al., 1984). pecíficamente en el oriente del país, son diversos los Las praderas de T. testudinum constituyen una estudios sobre los hábitos alimentarios y categorías fuente importante de alimento a pesar que pocos tróficas de peces (Carreño, 1975; González-Cabello, organismos se alimentan directamente de ella. Sin 1981; Hug, 1984; Parra & León, 1984; García et al., embargo, las principales cadenas tróficas están 1985; Caldera et al., 1988; Parra, 1992; Ramírez- basadas en el detrito derivado de esta fanerógama Arredondo, 1994; Rivas et al., 1999). Los estudios y pueden llegar a sostener cadenas alimentarias de sobre hábitos alimentarios y ecología trófica de zonas adyacentes; por otro lado, las hojas sirven de comunidades de peces asociadas a T. testudinum en substrato a muchos organismos epibiontes que suelen Venezuela son muy escasos a pesar de la contribución ser consumidos por un gran número de invertebrados al conocimiento científico que esto aporta, por lo que y peces. La estructura trófica en una pradera de T. tes- se planteó como objetivo principal de este estudio tudinum generalmente está formada por herbívoros, determinar la estructura y categorías tróficas de los carnívoros, omnívoros, detritívoros y suspensívoros peces asociados a tres praderas de T. testudinum del o filtradores, los cuales están interconectados unos a golfo de Cariaco, Venezuela. otros por los patrones de flujo energético (Greenway, 1995). La fauna asociada con T. testudinum es muy varia- MATERIALES Y MÉTODOS da tanto en vertebrados como invertebrados y desde el punto de vista ecológico y trófico, los diferentes Se seleccionaron tres praderas de T. testudinum de organismos que la habitan son muy importantes. aguas claras y someras de la costa sur del golfo de Los peces son los organismos más sobresalientes de Cariaco: Juana Josefa (10°26’N, 64°03’W), Tocu- esta comunidad debido a que son muy abundantes chare (10°26’N, 64°00’W) y Tunantal (10°26’N, y utilizan a la fanerógama de diversas maneras, ya 63°59’W) (Fig. 1). El golfo en general presenta una sea como refugio o como área de reproducción y alta productividad debido al fenómeno de surgencia alimentación. Las relaciones tróficas son esenciales característico del área (Ferraz-Reyes, 1987). para inferir sobre las interacciones biológicas en Las capturas de los peces se realizaron de diciem- comunidades animales (Carrasson & Cartes, 2002). bre de 1996 a noviembre de 1997, en horas diurnas La complejidad del hábitat y los depredadores pueden por medio de una red tipo chinchorro playero de 1,50 intervenir en la aparición, distribución y abundancia x 50 m y 0,7 cm de abertura de malla, realizándose de los pastoreadores (Schanz et al., 2002). La ali- un arrastre mensual en cada pradera. En el labora- Peces de praderas Thalassia testudinum y su categoría trófica 127 Figura 1. Ubicación de las estaciones de muestreo en el área de estudio. Figure 1. Sampling stations in the study area. torio los especímenes se mantuvieron refrigerados a Vargas-Maldonado et al., 1981; García et al., 1985; 3ºC. La identificación taxonómica y la ordenación Estrada,
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