Variabilidad mensual de la velocidad de surgencia y clorofila a en la región del Panama Bight

Villegas, Nancy; Málikov, Igor; Díaz, Diana

doi:10.21789/22561498.1153

Cited by 8 publications

(7 citation statements)

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“…Zooplankton samples used in this study were obtained during the ERFEN XV-CPC LI oceanographic campaign carried out in September 2012 aboard the ARC Providencia research vessel, ascribed to the Navy National Armed Forces and administered by the Maritime General Direction-DIMAR of Colombia. The oceanographic conditions at this location are strongly influenced by the Panama wind jet and by the intertropical convergence zone (Villegas & Málikov, 2006;Villegas, Málikov & Díaz, 2016). The 21 ºC isotherm occurs between 30 and 35 m depth year-round, and the 15 ºC isotherm occurs at 70 m depth during the first months of the year, and at over 125 m depth during the second semester of the year (Rodríguez-Rubio & Giraldo, 2011).…”

Section: Methodsmentioning

confidence: 99%

Euphausiids (Euphausiacea) off Malpelo Island, Colombian Eastern Tropical Pacific

Rivera-Gómez

Giraldo

2019

RBT

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Euphausiids migrate vertically in the water column as part of their diel cycle. These migrations make them a key element in the biological pump of the pelagic environment. We took stratified zooplankton samples (0-50, 50-100, and 100-150 m) during the Pacífico-ERFEN campaign in September 2012 to evaluate the vertical distribution of euphausiids around Malpelo Island (3.8 - 4.2 N, 81.4 - 81.8 W). A total of 10 species belonging to four genera were identified. Euphausia diomedeae was the most abundant species in the 0-50 and 100-150 m layers, whereas E. distinguenda was the most abundant species in the 50-100 m layer. Based on quasi-Poisson generalized linear distribution models we found that abundance in the 50-100 m layer was significantly higher than in the 100-150 m layer (t = 3.05, p < 0.05). There were no significant differences associated with sampling hour (diurnal/nocturnal) (t = 0.07, p = 0.94). We calculated a vertical distribution index (VDI) based on abundance, which showed that euphausiid species were concentrated in the 50-100 m layer during day and night. Calyptopis larvae dominated in abundance at all depth layers, followed by furcilia larvae, juveniles and adults. The abundance of the latter increased gradually from the most superficial layer to the deepest layer, whereas juveniles showed the opposite pattern. This is the first study to describe the taxonomic composition, and vertical and spatial distribution of euphausiids associated with Malpelo Island, Colombian Pacific.

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Section: Methodsmentioning

confidence: 99%

Euphausiids (Euphausiacea) off Malpelo Island, Colombian Eastern Tropical Pacific

Rivera-Gómez

Giraldo

2019

RBT

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“…It could be that CCS is greatly influenced by local atmospheric and hydrographic processes (Lonin et al 2010, Restrepo et al 2014, generating more differences between the observed SST and the series obtained by ROMS. Instead, the CPB exchanges its waters with the open ocean (Villegas & Malikov 2009) and is influenced by global and regional processes (Wallace et al 1989, Zhang et al 2010, Zheng et al 2012, Villegas et al 2016, which appear to be reflected in the initial, boundary and forcing conditions given to ROMS. Although these factors allowed achieving better results in CPB than in CCS, we have to consider the conclusions of Sierra et al (2018), who evaluated the ability to simulate the ChLLJ of coupled and uncoupled GCMs included in CMIP5.…”

Section: Comparison Between Sst Simulated With Roms In the Recent Past And Observed Data For The Cpb Through Deviation Measuresmentioning

confidence: 99%

“…7b), excluding negative trends observed in the small coastal areas characterized by marked rivers influx from the Andes (Restrepo 2006), positive trends are found throughout the region. Higher positive trends are in 1) the WCSW zone , 2) south of the CPB where oceanic waters (ESW) arrive as part of the NECC (Chaigneau et al 2006), and 3) in upwelling areas observed all year round (Villegas et al 2016) named CCSW. Biasutti et al (2012), when comparing simulations between North American Regional Climate Change Program (NARCCAP) and IPCC AR4 projections, pointed that future climate will resemble an El Niño event, implying weakening of tropical atmospheric circulation in response to warming.…”

Section: Sst Trends In the Colombian Caribbean Sea (Ccs) And Colombian Pacific Basin (Cpb)mentioning

confidence: 99%

Sea surface temperature in continental and insular coastal Colombian waters: observations of the recent past and near-term numerical projections

Villegas

Málikov

Farneti

2021

Lat. Am. J. Aquat. Res.

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Sea surface temperature (SST) simulation for the 1970-2007 period and its projection up to 2035 was carried out with the Regional Ocean Modeling System (ROMS) for the Colombian Caribbean Sea (CCS) and the Colombian Pacific Basin (CPB). Spatial bias using the International Comprehensive Ocean-Atmosphere Data Sets (ICOADS) and Operational Sea Surface Temperature and Sea Ice Analysis (OSTIA) for 1982-2007 shows an adequate representation of surface characteristics in both marine study regions, especially on the CPB. The 1970-2007 period's deviation measures reveal a good fit between ICOADS data and simulated SST. The spatial distribution of linear multi-annual regression (ICOADS 1970(ICOADS -2007) evidences a similar positive trend in both regions (0.01ºC yr -1 ). Differences in the spatial distribution of trends between the two regions (ROMS 2008(ROMS -2035 prescribe that general warming of CCS will be less (0.01ºC yr -1 ) than that of CPB (0.02ºC yr -1 ). The average SST trend in waters close to continental and insular coastal stations of CCS and CPB obtained from ICOADS are 0.016 and 0.013°C yr -1 , respectively. The average trend in the same stations obtained from the projection using ROMS (2008-2035) is 0.025°C yr -1 for CCS and 0.015°C yr -1 for CPB. The SST projection for 2008-2035 in the CCS shows the highest SST increase slope in waters near Punta Gallinas and in the CPB it is evidenced in waters near Malpelo Island.

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“…Este patrón, se ha observado, por ejemplo, al norte de Tenerife (islas Canarias), con aumento de los quetognatos y otros zoopláncteres epipelágicos, por la menor presión depredadora del macrozooplancton y el micronecton (Hernández et al 2001) . Hacia la superficie de la misma región, la biomasa seca del mesozooplancton puede ser muy alta en cuarto creciente y disminuir drásticamente tras luna llena, la que se puede elevar en estratos inferiores, con una gran El análisis de agrupamiento (Figura 4) mostró el asocio de las estaciones de muestreo en cuatro bloques, según los periodos día: noche y las fases lunares, alguna correspondencia con la ubicación de las estaciones en el OPC y los eventos de surgencia, reportados como permanentes para la época de muestreo (Málikov & Villegas, 2010;Villegas et al 2016) .…”

Section: Distribución De Las Biomasas Y Abundanciasunclassified

Abundancia y biomasa de Chaetognatha (Aphragmophora) en la zona pelágica del Pacífico Colombiano

Peralta

2018

Rev. U.D.C.A Act. & Div. Cient.

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RESUMENDada la importancia de los quetognatos por su alto impacto depredador y su rol en la transferencia energética desde el fitoplancton hasta niveles tróficos superiores, por primera vez, se evaluó en el Océano Pacífico Colombiano (OPC) su biomasa seca, además de su abundancia, en relación con la estructura termohalina y la influencia de la luz, durante septiembre de 2007 . Se analizaron 23 muestras obtenidas con una red bongo, mediante arrastres oblicuos en el estrato epipelágico de sendas estaciones, distribuidas en toda el área . Las condiciones abióticas fueron características de una época normal, con posible beneficio para la comunidad de los quetognatos, en respuesta a la disponibilidad de alimento . Mientras que los adultos dominaron en las sub-áreas intermedia (x̅ = 240 ind ./100m 3 , 34,7g/100m 3 ) y oceánica (x̅ = 290 ind ./100m 3 39,2g/100m 3 ), las aguas costeras, generalmente más productivas, pudieron promover el desove, el desarrollo y el mayor biomasa-abundancia de los juveniles (910ind ./100m 3 , 26,2g/100m 3 ), sugiriendo su mejor adaptación a aguas menos salinas, así como un impacto trófico más marcado y un papel más relevante, que los adultos en la estructura de la comunidad zooplanctónica . Es muy probable que la dinámica hidrológica haya influido en la distribución heterogénea de los organismos en la zona epipelágica, con biomasa-abundancia más alta en algunas estaciones costeras y oceánicas, debido a la mayor oferta trófica resultante de la conjunción de procesos de surgencia, migración vertical nocturna e influencia lunar, en especial, durante luna nueva y cuarto creciente . Se da una lista de verificación preliminar de los quetognatos . SUMMARYDue to the importance of chaetognaths, their high predatory impact and their role in energy transfer from phytoplankton to higher trophic levels, their abundance and dry biomass were evaluated for the first time in relation to thermohaline structure and light influence in the Colombian Pacific Ocean (CPO) in September 2007 . Twenty-three samples were obtained with a bongo net (294 μm mesh) by oblique trawls in the epipelagic stratum in equal number of stations distributed throughout the CPO . Abiotic conditions were characteristic of a normal period, with possible benefit to the chaetognath community as a result of food availability . While adults dominated in the intermediate (x̅ = 240 ind/100 m 3 , 34 .7 g/100 m 3 ) and oceanic (x̅ = 290 ind/100 m 3 39 .2 g/100 m 3 ) subareas, coastal waters, generally more productive, promoted the spawning, development and higher abundance and biomass of juveniles (910 ind/100 m 3 , 26 .2 g/100 m 3 ), which indicates better adaptation to less saline waters, as well as a more pronounced trophic impact and relevant role to the structure of the zooplankton community when compared to the adult community . It is likely that hydrological dynamics have influenced heterogeneous organism distribution on the epipelagic zone, with a higher biomass-abundance in some coastal and oceanic stations, due to greater trophic supp...

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Variabilidad mensual de la velocidad de surgencia y clorofila a en la región del Panama Bight

Cited by 8 publications

References 3 publications

Euphausiids (Euphausiacea) off Malpelo Island, Colombian Eastern Tropical Pacific

Euphausiids (Euphausiacea) off Malpelo Island, Colombian Eastern Tropical Pacific

Sea surface temperature in continental and insular coastal Colombian waters: observations of the recent past and near-term numerical projections

Abundancia y biomasa de Chaetognatha (Aphragmophora) en la zona pelágica del Pacífico Colombiano

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