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Studies on metabolic balance in hermatypic corals have been unable to separate the analysis of animal’s respiration from that of plant. The objective of this research was to determine the metabolic balance in the mutualistic symbiosis polyp-algae through incubations in respirometric chambers of twelve fragments of coral. The species studied Porites panamensis (Scleractinia: Poritidae), Verrill, 1866 was collected near La Paz, Baja California Sur, Mexico. Experiments were performed during fall 2009 and winter 2010. Water temperature, salinity, dissolved oxygen, pH, irradiance and photosynthetic pigments were measured every two hours during the incubation times. The concentration of pigments was determined through spectrophotometry. The maximum primary production was at 12:00 h, with 3.80 mg O 2 ∙l -1 ∙h -1 for fall and 4.92 mg O 2 ∙l -1 ∙h -1 for winter. According to the P : R (Production : Respiration) ratio of 1.90 for fall and 2.07 for winter, the mutualistic symbiosis in P. panamensis showed a predominantly autotrophic behavior. The relative quotients of chlorophyll concentrations (mg∙polyp -1 ), Chl a : Chl c 2 , were 1.0 : 0.69 for fall and 1.0 : 1.22 for winter; while ratio of concentrations chlorophyll a : carotenes , Chl a : carotenes (both in mg∙polyp -1 ), were 1.0 : 2.13 for fall and 1.0 : 1.88 for winter. The high relative concentrations of Chl c 2 and carotenes with respect to Chl a is explained as an adaptive response to high irradiance. Balance metabolico en la simbiosis mutualista polipo-alga en el coral hermatipico Porites panamensis en La Paz, Baja California Sur, Mexico Estudios del balance metabolico en corales hermatipicos han sido incapaces de separar el analisis de la respiracion animal y vegetal. El objetivo en este trabajo fue determinar el balance metabolico en la simbiosis mutualista alga-polipo a traves de incubaciones en camaras respirometricas en doce fragmentos de coral. Los experimentos se realizaron en otono del 2009 e invierno del 2010. La especie estudiada fue Porites panamensis (Scleractinia: Poritidae), Verrill, 1866, recolectada en La Paz, Baja California Sur, Mexico. La temperatura del agua, salinidad, oxigeno disuelto, pH, irradiacion y pigmentos fotosinteticos fueron registrados cada dos horas durante los tiempos de incubacion. Los pigmentos fotosinteticos se determinaron mediante espectrofotometria. La produccion primaria maxima fue a las 12:00 h, con 3.80 mg O 2 ∙l -1 ∙h -1 para otono y 4.92 O 2 ∙l -1 ∙h -1 para invierno. De acuerdo con el cociente P : R (Produccion : Respiracion) con valor de 1.90 para el otono, y 2.07 para el invierno, la simbiosis mutualista en P. panamensis muestra un comportamiento predominantemente autotrofo. Los cocientes relativos de concentracion de clorofilas (mg ∙polyp -1 ), Cl a : Cl c 2 , fueron 1.0 : 0.69 para otono y 1.0 : 1.22 para invierno, mientras que la relacion de clorofila a : carotenos, Cl a : carotenos (ambos en mg∙polyp -1 ), fueron de 1.0 : 2.13 para otono y 1.0 : 1.88 para invierno. Las altas concentraciones relativas de Cl c 2 y carotenos con respecto a Cl a se explican como una respuesta adaptativa a una mayor irradiancia.

Metabolic balance of the polyp-algae mutualistic symbiosis in the hermatypic coral Porites panamensis in La Paz, Baja California Sur, Mexico.