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Variabilidad metabΓ³lica de dos corales masivos constructores de arrecifes ππ³π£πͺπ€π¦πππ’ π§π’π·π¦π°ππ’π΅π’ y ππͺπ₯π¦π³π’π΄π΅π³π¦π’ π΄πͺπ₯π¦π³π¦π’ en el gradiente de profundidad en la Reserva Natural La Parguera, Lajas, Puerto Rico
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Abstract
Los arrecifes de coral son comunidades marinas complejas, altamente productivas y diversas. Los simbiontes que viven dentro del tejido del coral juegan un papel importante en el metabolismo de estos. Existe poca informaciΓ³n sobre las tasas metabΓ³licas basales y los cambios bajo diferentes condiciones ambientales o de estrΓ©s para los corales escleractinios. Los cambios en las tasas metabΓ³licas permiten evaluar la respuesta de estos organismos. Ha habido varios intentos de medir las tasas basales y su respuesta a las condiciones ambientales usando diferentes mΓ©todos que eran logΓsticamente complejos y requerΓan mover o manipular el organismo de su hΓ‘bitat, lo cual causa cambios en el nivel metabΓ³lico. Recientemente, se desarrollΓ³ un instrumento llamado CISME (Coral In Situ Metabolism) (CISME Instruments, LLC) para medir las tasas de respiraciΓ³n y fotosΓntesis in situ el cual permite evaluar la salud metabΓ³lica de los corales individuales sin manipular las colonias. Los objetivos de este proyecto eran utilizar el CISME para evaluar la variabilidad metabΓ³lica a lo largo del gradiente de profundidad en dos importantes especies masivas formadoras de arrecifes, Orbicella faveolata y Siderastrea siderea, y cuΓ‘n diferentes eran estas tasas entre las dos especies en la Reserva Natural La Parguera en Puerto Rico. Se realizaron tres mediciones repetidas con el CISME en cada una de las seis colonias de tamaΓ±o mediano de cada especie en cada uno de los tres intervalos de profundidad (0-5, 5-10, 15-20m). Los resultados mostraron una disminuciΓ³n significativa en las tasas metabΓ³licas (respiraciΓ³n, fotosΓntesis y calcificaciΓ³n) a lo largo del gradiente de profundidad en ambas especies (PERMANOVA, P < 0.05). Hubo una alta variabilidad intra e inter-colonia dentro de ambas especies y O. faveolata mostrΓ³ tasas de respiraciΓ³n y fotosΓntesis mΓ‘s altas en comparaciΓ³n con S. siderea. La tasa de calcificaciΓ³n tambiΓ©n mostrΓ³ una disminuciΓ³n con el gradiente de profundidad (pero no significativa) en ambas especies.
Coral reefs are complex, highly productive, and diverse marine communities. The symbionts that live within the coral tissue play an important role in coral metabolism. Little information exists on basal metabolic rates and changes under different environmental or stress conditions for scleractinian corals. Changes in metabolic rates allows the assessment of the response of these organisms. There have been several attempts to measure respiration, photosynthesis, and calcification basal rates, and their response to changing conditions using different methods were logistically complex and cumbersome, and required removing and manipulating the organism from its habitat, which inherently causes changes at the metabolic level. Recently, an instrument called CISME (Coral In Situ Metabolism) (Coral Instruments, LLC) was developed to measure respiration and photosynthesis rates in situ. It assesses the metabolic health of individual corals and other important benthic components of coral reefs without manipulation of colonies. The goals of this project were to use CISME to assess the depth-related metabolic variability within each of two important reef-building, massive species, Orbicella faveolata and Siderastrea siderea species, and how different these rates were between the two species in La Parguera Natural Reserve in Puerto Rico. Three replicate CISME measurements were done in each of six, medium size colonies of each species in each of three depth intervals (0-5, 5-10, 15-20m). Results showed a significant decrease in metabolic rates (respiration, photosynthesis, and calcification) along the depth gradient in both species (PERMANOVA, P < 0.05). There was high intra- and inter-colony variability within both species and, O. faveolata showed higher respiration and photosynthesis rates compared to S. siderea. The calcification rate also showed a decrease with the depth gradient (but not significant) in both species.
Coral reefs are complex, highly productive, and diverse marine communities. The symbionts that live within the coral tissue play an important role in coral metabolism. Little information exists on basal metabolic rates and changes under different environmental or stress conditions for scleractinian corals. Changes in metabolic rates allows the assessment of the response of these organisms. There have been several attempts to measure respiration, photosynthesis, and calcification basal rates, and their response to changing conditions using different methods were logistically complex and cumbersome, and required removing and manipulating the organism from its habitat, which inherently causes changes at the metabolic level. Recently, an instrument called CISME (Coral In Situ Metabolism) (Coral Instruments, LLC) was developed to measure respiration and photosynthesis rates in situ. It assesses the metabolic health of individual corals and other important benthic components of coral reefs without manipulation of colonies. The goals of this project were to use CISME to assess the depth-related metabolic variability within each of two important reef-building, massive species, Orbicella faveolata and Siderastrea siderea species, and how different these rates were between the two species in La Parguera Natural Reserve in Puerto Rico. Three replicate CISME measurements were done in each of six, medium size colonies of each species in each of three depth intervals (0-5, 5-10, 15-20m). Results showed a significant decrease in metabolic rates (respiration, photosynthesis, and calcification) along the depth gradient in both species (PERMANOVA, P < 0.05). There was high intra- and inter-colony variability within both species and, O. faveolata showed higher respiration and photosynthesis rates compared to S. siderea. The calcification rate also showed a decrease with the depth gradient (but not significant) in both species.
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Date
2023-07-07
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Keywords
Metabolismo de corales, CISME, FotosΓntesis bruta, RespiraciΓ³n oscura, CalcificaciΓ³n