Microfitoplancton a lo largo de la ruta transpacífica y al norte de la Península Antártica Occidental , Verano Austral 2023-2024

dc.contributor.advisorTigreros Benavides, Paulo César
dc.contributor.advisorHerrera, Andrés Franco
dc.contributor.advisorNariño Vargas, María José
dc.creatorCalderón Valderrama, Santiago José
dc.date.accessioned2025-11-24T19:41:05Z
dc.date.created2025-11-24
dc.description.abstractEl fitoplancton desempeña un papel esencial al conectar procesos atmosféricos y oceánicos, siendo un eslabón fundamental en las redes tróficas y en la fijación global de carbono. Este estudio, llevado a cabo durante la X Expedición de Colombia a la Antártica en el verano austral 2023-2024, examinó la composición del fitoplancton a lo largo de la ruta transpacífica y en el norte de la Península Antártica Occidental (PAO). Las muestras se recolectaron con botellas Niskin acopladas a una roseta oceanográfica a la profundidad de máxima Chl-a y se fijaron con Lugol. La identificación y cuantificación de los organismos se realizó mediante microscopía invertida aplicando la metodología de Utermöhl. La biomasa de carbono se estimó con los modelos geométricos de Hillebrand et al. (1999) y Sun y Liu (2003) y de acuerdo con la metodología de Menden-Deuer y Lessard (2000). Los resultados indicaron que la ruta transpacífica presentó mayor densidad y biomasa (620 cel/L y 1,78 μg C/L) que el norte de la PAO (170 cel/L y 0,10 μg C/L), con una dominancia de dinoflagelados de 20 a 50 μm (Prorocentrum spp. y Protoperidinium spp.), mientras que en el norte de la PAO predominaron diatomeas céntricas (Thalassiosira spp.) y dinoflagelados atecados de 20 a 30 μm (Gyrodinium spp.). Ambos sectores se vieron afectados por el evento de El Niño 2023-2024 resultando en una reducción de la densidad y biomasa del microfitoplancton con respecto a otros estudios realizados durante otros eventos El Niño, influenciada principalmente por la abundancia más que por el biovolumen.
dc.description.abstractenglishPhytoplankton plays a vital role in linking atmospheric and oceanic processes, being fundamental to the trophic web and global carbon fixation. This study, conducted during the X Colombian Expedition to Antarctica, at austral summer of 2023–2024, examined phytoplankton composition along the transpacific route and in the northern region of the Western Antarctic Peninsula (WAP). Samples were collected at the depth of maximum Chl-a concentration with Niskin bottles and fixed with Lugol solution. Organisms were identified and quantified through inverted microscopy applying the Utermöhl method. Carbon biomass was estimated following the geometric models of Hillebrand et al. (1999) and Sun and Liu (2003), as well as the methodology of Menden-Deuer and Lessard (2000). Results indicated higher density and biomass along the transpacific route (620 cells/L and 1,78 μg C/L), with dominance of dinoflagellates measuring 20–50 μm (Prorocentrum spp. and Protoperidinium spp.), whereas in the northern WAP, centric diatoms (Thalassiosira spp.) and athecate dinoflagellates measuring 20–30 μm (Gyrodinium spp.) predominated. Both regions were affected by the 2023–2024 El Niño event resulting in a reduction in microphytoplankton density and biomass, which was primarily influenced by the abundance rather than their volume.
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dc.identifier.urihttps://hdl.handle.net/20.500.12010/38447
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dc.subjectRuta transpacífica Antártica
dc.subjectBiomasa
dc.subjectAbundancia
dc.subjectBiovolumen
dc.subject.keywordTrans-pacific route
dc.subject.keywordAntarctic
dc.subject.keywordBiomass
dc.subject.keywordAbundance
dc.subject.keywordBiovolume
dc.subject.lembFitoplancton - Análisis
dc.subject.lembBiomasa marina - Evaluación
dc.subject.lembCambio climático - Impacto en organismos marinos
dc.titleMicrofitoplancton a lo largo de la ruta transpacífica y al norte de la Península Antártica Occidental , Verano Austral 2023-2024
dc.type.coarhttp://purl.org/coar/resource_type/c_7a1f

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