Seasonal plankton variability in Chilean Patagonia fjords: Carbon flow through the pelagic food web of Aysen Fjord and plankton dynamics in the Moraleda Channel basin

González, Humberto E.; Castro, L. R.; Daneri, Giovanni; Iriarte, J. L.; Silva, N.; Vargas, Cristian A.; Giesecke, Ricardo; Sánchez, Nicolás

doi:10.1016/j.csr.2010.08.010

Cited by 83 publications

(43 citation statements)

References 37 publications

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“…Such latitudinal variation may be associated to the constant entrance of SAAW that mixes with the EW, causing less vertical stability in the water column of the northern sector (Boca del Guafo, Corcovado Gulf and northern area of the Moraleda Channel) (Silva & Guzmán, 2006), and a higher stability in the southern zone (Aysén and Elefantes fjords), where the continental freshwater input is higher. In spring, however, no geographical distribution pattern was observed, as there is a generalized abundance in the whole study area probably due to a higher trophic availability as a result of the elevated biological productivity caused by a larger solar radiation and temperature increase typical of the beginning of the summer period (González et al, 2011), which promotes jellyfish reproduction and proliferation in the study area.…”

Section: Seasonal Distributions Patterns Of Jellyfishmentioning

confidence: 95%

“…These abundance fluctuations have also been ascribed to the trophic availability and inter-specific competence in highly productive systems (Edwards & Richardson, 2004). Studies on inner waters have shown a high biological productivity in inner waters during spring, especially in the Moraleda Channel, reflected in high primary productivity values and zooplanktonic biomass (Palma & Silva, 2004;González et al, 2011). Besides, it has also been suggested the simultaneous occurrence of two or more species in the community reflects some degree of consistency in the ecological, environmental or biological requirements with a tendency to form more or less compact groups according to their requirement similarities (Lie et al, 1983;Gasca et al, 1996).…”

Section: Seasonal Distributions Patterns Of Jellyfishmentioning

confidence: 99%

“…The phylum Cnidaria has been widely studied in the Chiloé region (Galea, 2007;Galea et al, 2007;Palma et al, 2007aPalma et al, , 2007bPalma et al, , 2011Villenas et al, 2009a), which is characterized by high biological production reflected on high values of chlorophyll-a (González et al, 2011) and zooplanktonic biomass, mainly supported by copepods, euphausiids and carnivorous jellyfish (Palma & Silva, 2004). In this area, strong seasonal fluctuations have been established in jellyfish abundance in winter and spring, observing 33 species with a summer dominance of Amphogona apicata, Bougainvillia muscoides, Clytia simplex, Cunina peregrina, Hydractinia tenuis, Obelia spp.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal and vertical distribution of medusae in Aysen region, southern Chile

Bravo

Palma

Silva

2011

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ABSTRACT. Medusae collected in winter and spring 2007 were analyzed in a longitudinal transect made between the Boca de Guafo and Elefantes Fjord, southern Chile. A total of 30 species were identified, Hydromedusae (29) and Scyphozoa (1), where Bougainvillia macloviana, Hybocodon chilensis, Hydractinia tenuis, Laodicea pulcra, L. undulada, Modeeria rotunda and Chrysaora plocamia represent new records for the area. A significant increase in the jellyfish abundance was higher in spring than in winter (fourteen times higher), with 68% of common species in both seasons. The specific diversity was slightly higher in winter (3.4 bits) than spring (3.2 bits), the species richness instead was higher in spring than in winter, with a mean of 5 and 12 species, respectively. The vertical distribution showed the presence of surface (H. borealis), deep (A. apicata, C. peregrina and R. velatum) and wide bathymetric distribution (B. muscoides and B. muscus) species. Results from the area were compared with previous results (2002)(2003) thus proving that most species identified are common in southern Chilean fjords and channels.

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Section: Seasonal Distributions Patterns Of Jellyfishmentioning

confidence: 95%

Section: Seasonal Distributions Patterns Of Jellyfishmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal and vertical distribution of medusae in Aysen region, southern Chile

Bravo

Palma

Silva

2011

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“…This ecosystem is greatly influenced by rivers and the Patagonian Ice Fields (Pickard, 1971) and supports high rates of biological productivity and vertical export fluxes of carbon (Pantoja et al, 2005;González et al, 2010González et al, , 2011González et al, , 2013Montero et al, 2011Montero et al, , 2017a. The Patagonian fjord ecosystem as a whole is considered to represent a net sink of CO 2 (Torres et al, 2011;González et al, 2013) and of enhanced sedimentary burial of organic carbon (Sepúlveda et al, 2011;Smith et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Linking Seasonal Reduction of Microbial Diversity to Increase in Winter Temperature of Waters of a Chilean Patagonia Fjord

et al. 2018

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Since microorganisms play a major role in the biogeochemistry of the ocean, understanding structure and dynamics of natural microbial communities is crucial in assessing the impact of environmental changes on marine ecosystems. In order to identify key environmental drivers of microbial community structure in Chilean Patagonian fjords, we analyzed composition of the prokaryotic community over an annual cycle at a single sampling site in Puyuhuapi Fjord. Distinctive communities represented mainly by Actinomycetales, Rhodobacteraceae, Cryomorphaceae, and Flavobacteriaceae were associated with Estuarine Fresh Waters, whereas Cenarchaeaceae and Oceanospirillales were representative of Modified Sub Antarctic Waters present in the fjord. Salinity and oxygen were first-order factors explaining segregation of microbial communities in these contrasting water masses. Positive correlations of members of Flavobacteriaceae, Alteromonadales, and Verrucomicrobiales with diatoms in subsurface waters and of Flavobacteriales (Cryomorphaceae and Flavobacteriaceae), Rhodobacteraceae, and Pelagibacteraceae with dinoflagellates in surface waters suggest that phytoplankton composition could define specific niches for microorganisms in Puyuhuapi fjord waters. A dramatic reduction of richness and individual abundances within Flavobacteriaceae, Rhodobacteraceae, and Cenarchaeaceae families was principally explained by seasonal increase of surface water temperature, with major reduction associated with changes in temperature during winter conditions. Taxa that are sensitive to increased temperature are key components of organic matter and element cycling, and we therefore suggest that potential decrease in diversity associated with rising of surface water temperature could impact current biogeochemical status of Patagonian fjord ecosystems.

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“…Además, en esta zona, no se observó la presencia de las masas de aguas oceánicas y mezcladas, e.g., ASAAM y ASAA, debido a que la fuerte convección por temperatura no sólo profundizó las isotermas, sino también las isohalinas, resultando entonces en un menor gradiente de salinidad, que también contribuyó a la disminución de la intensidad de la DDC. La ocurrencia de la DDC por debajo de la capa estratificada de la columna de agua (7-10 m) conjuntamente con el viento, mareas y ondas internas (Aiken, 2008), constituyen un mecanismo importante para la mezcla vertical, influenciando el hábitat de las especies marinas en estas profundidades y a la exportación de carbono hacia los sedimentos (González et al, 2011). Queda por determinar la magnitud de los flujos de calor hacia la superficie desde el ASAA por medio del mecanismo de la DDC.…”

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Doble difusion a partir de mediciones de microestructura en los canales Martinez y Baker, Patagonia chilena central (47,85S)

Peréz-Santos

Garces-Vargas

Schneider

et al. 2013

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RESUMEN.Con un microperfilador SCAMP (Self Contained Autonomous MicroProfile) se detectó un proceso de Doble Difusión Convectiva (DDC), en los canales Martínez y Baker de la Patagonia central, Chile. Este perfilador midió temperatura y salinidad en la columna de agua con una resolución del orden de milímetros. El muestreo se efectuó en diciembre 2011, en 19 estaciones oceanográficas de ∼55 m de profundidad. Los registros del microperfilador permitieron detectar la formación de escaleras termohalinas que caracterizan la formación de la DDC. Por medio del ángulo de Turner se confirmó que debajo de una capa superficial fuertemente estratificada (7-10 m) se registraron eventos de DDC a profundidades entre 15 y 45 m. La DDC fue débil en la mayoría de los registros pero se evidenciaron eventos fuertes entre 15 y 40 m. En la capa subsuperficial, su origen se debió al intercalamiento de las masas aguas estuarinas (aguas frías y menos saladas) encima de las oceánicas (aguas más cálidas y saladas), mientras que en la superficie la interacción océano-atmósfera favoreció su ocurrencia. La DDC en conjunto con el viento, las mareas y las ondas internas, puede constituir un mecanismo importante para la mezcla vertical, influenciando los flujos de calor, el hábitat de las especies marinas en estas profundidades y la exportación de carbono hacia los sedimentos. Palabras clave: doble difusión, convección, escaleras termohalinas, canales australes, Patagonia chilena. Double diffusion from microstructure measurements in the Martínez and Baker channels, central Chilean Patagonia (47.85°S)ABSTRACT. Double-diffusive convection (DDC) has been detected in the Martinez and Baker channels of central Patagonia (Chile) by employing a Self Contained Autonomous Micro-Profiler (SCAMP). This profiler measures temperature and salinity in the water column with a vertical resolution on the millimetre scale. The expedition took place in December 2011 and included 19 vertical high-resolution profiles from surface to ∼55 m depth. The formation of thermohaline staircase patterns, resulting from the DDC process, could be documented by the micro-profiler's measurements. DDC events, below the shallow but strongly stratified surface layer (7-10 m), were confirmed to occur in intermediate depths between 15 and 45 m by means of the Turner angle. Most of these events were usually weak but several strong ones could also be detected between 15 and 40 m. DDC is initiated at the interface between sub-surface waters of estuarine origin (cold and less salty) and intermediate waters of oceanic origin (warmer and saltier), with upward heat and salt fluxes. DDC together with mixing caused by winds, tides, and internal waves, constitute an important mechanism for mixing the water column with implications for small organisms therein.

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Seasonal plankton variability in Chilean Patagonia fjords: Carbon flow through the pelagic food web of Aysen Fjord and plankton dynamics in the Moraleda Channel basin

Cited by 83 publications

References 37 publications

Seasonal and vertical distribution of medusae in Aysen region, southern Chile

Seasonal and vertical distribution of medusae in Aysen region, southern Chile

Linking Seasonal Reduction of Microbial Diversity to Increase in Winter Temperature of Waters of a Chilean Patagonia Fjord

Doble difusion a partir de mediciones de microestructura en los canales Martinez y Baker, Patagonia chilena central (47,85S)

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