Compilación Oceanográfica de la Cuenca Pacífica Colombiana

Morales, Andrea Devis; Hansen, Ingrid García; Málikov, Igor; Bolaños, Nancy Liliana Villegas

doi:10.26640/9583338699.2002

Cited by 5 publications

(2 citation statements)

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“…3 ) coincided with El Niño events ( Canchala et al, 2020 ; NOAA, 2022 ) when the winds and upwelling are relaxed ( Ledesma et al, 2022 ). These findings coincide with what has been previously described for the Colombian Pacific basin during different phases of ENSO events, with high DO conditions during an El Niño year (1998, 6.8 mg L −1 ) and low DO conditions during a La Niña year (1999, 4.5 mg L −1 ; Devis-Morales et al, 2002 ).…”

Section: Discussionsupporting

confidence: 91%

Spatiotemporal variability of oxygen concentration in coral reefs of Gorgona Island (Eastern Tropical Pacific) and its effect on the coral Pocillopora capitata

Castrillón-Cifuentes

Zapata

Giraldo

et al. 2023

PeerJ

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Dissolved oxygen concentration (DO) is one of the main factors limiting benthic species distribution. Due to ocean warming and eutrophication, the ocean is deoxygenating. In the Eastern Tropical Pacific (ETP), deep waters with low DO (<1 mg L−1) may reach coral reefs, because upwelling will likely intensify due to climate change. To understand oxygen variability and its effects on corals, we characterize the Spatio-temporal changes of DO in coral reefs of Gorgona Island and calculate the critical oxygen tension (Pcrit) to identify the DO concentration that could represent a hypoxic condition for Pocillopora capitata, one of the main reef-building species in the ETP. The mean (±SD) DO concentration in the coral reefs of Gorgona Island was 4.6 ± 0.89 mg L−1. Low DO conditions were due to upwelling, but hypoxia (<3.71 mg L−1, defined as a DO value 1 SD lower than the Mean) down to 3.0 mg O2 L−1 sporadically occurred at 10 m depth. The Pcrit of P. capitata was 3.7 mg L−1 and lies close to the hypoxic condition recorded on coral reefs during the upwelling season at 10 m depth. At Gorgona Island oxygen conditions lower than 2.3 mg L−1 occur at >20 m depth and coincide with the deepest bathymetric distribution of scattered colonies of Pocillopora. Because DO concentrations in coral reefs of Gorgona Island were comparably low to other coral reefs in the Eastern Tropical Pacific, and the hypoxic threshold of P. capitata was close to the minimum DO record on reefs, hypoxic events could represent a threat if conditions that promote eutrophication (and consequently hypoxia) increase.

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Section: Discussionsupporting

confidence: 91%

Spatiotemporal variability of oxygen concentration in coral reefs of Gorgona Island (Eastern Tropical Pacific) and its effect on the coral Pocillopora capitata

Castrillón-Cifuentes

Zapata

Giraldo

et al. 2023

PeerJ

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“…As is typical of coastal waters in the region, seawater salinity at Gorgona is relatively low and variable (29-33) compared to that of the open ocean, but nonetheless it is higher and more stable than that of the mainland coast, which is usually <20ºC (Prahl 1986). The tidal regime at Gorgona is semidiurnal with a maximum vertical range of ~5.7 m. Climatic and oceanographic conditions are described in greater detail by Díaz et al (2001) and Giraldo et al (2008) for Gorgona, and by Devis-Morales et al (2002) for the Colombian Pacific basin. Besides strong El Niño warming events that periodically (on average once every 13 years) cause severe coral bleaching and mortality (Glynn 1990, the most significant physical perturbation on Gorgona Island coral reefs are repeated aerial exposures during extreme low tides.…”

Section: Study Area: Coral Reefs In the Colombianmentioning

confidence: 98%

Mid-term coral-algal dynamics and conservation status of a Gorgona Island (Tropical Eastern Pacific) coral reef

Zapata

Rodríguez-Ramírez

Caro-Zambrano

et al. 2015

RBT

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<span>A través del Sistema Nacional de Monitoreo de Arrecifes Coralinos en Colombia (SIMAC) se han colectado anualmente (1998-2004) datos de cobertura de corales y algas en 20 transectos de 10m localizados en dos profundidades de dos sitios del arrecife de La Azufrada, Isla Gorgona (costa Pacífica). En general, la cobertura coralina fue alta (55.1% - 65.7%) y la de algas baja (28.8% - 37.5%), con una significativa variación entre años, más notablemente en áreas someras. Las diferencias entre sitios tanto en cobertura de coral como de algas estuvieron presentes desde que comenzó el estudio y pueden ser explicadas por diferencias en estrés por sedimentación (escorrentía terrestre). Las diferencias entre las profundidades muy probablemente se deben a los efectos de exposiciones aéreas durante mareas bajas. Las exposiciones aéreas particularmente intensas y repetidas entre enero-marzo de 2001 explican la disminución de la cobertura de coral, y aumento de la de algas en áreas someras observadas más tarde ese año. Adicionalmente, el área somera del sitio norte parece ser negativamente afectada por el efecto combinado de la sedimentación y la exposición mareal. Sin embargo, una tendencia a la disminución de la cobertura coralina y aumento de la de algas desde 2001 en las áreas profundas de ambos sitios permanece sin explicación. Comparaciones con estudios previos indican que el arrecife de La Azufrada ha sido más elástico que otros arrecifes del Pacífico Oriental Tropical (POT). A pesar de las perturbaciones naturales recurrentes, la cobertura coralina en 2004 fue tan alta como la existente antes de 1982 en La Azufrada, y una de las más altas observadas en arrecifes coralinos saludables de la región del POT.</span>

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Projecting future changes in distributions of small-scale pelagic fisheries of the southern Colombian Pacific Ocean

Selvaraj¹,

Rosero-Henao

Cifuentes-Ossa³

2022

Heliyon

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Compilación Oceanográfica de la Cuenca Pacífica Colombiana

Cited by 5 publications

References 0 publications

Spatiotemporal variability of oxygen concentration in coral reefs of Gorgona Island (Eastern Tropical Pacific) and its effect on the coral Pocillopora capitata

Spatiotemporal variability of oxygen concentration in coral reefs of Gorgona Island (Eastern Tropical Pacific) and its effect on the coral Pocillopora capitata

Mid-term coral-algal dynamics and conservation status of a Gorgona Island (Tropical Eastern Pacific) coral reef

Projecting future changes in distributions of small-scale pelagic fisheries of the southern Colombian Pacific Ocean

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