Latitudinal patterns of export production recorded in surface sediments of the Chilean Patagonian fjords (41–55°S) as a response to water column productivity

Aracena, Claudia; Lange, Carina B.; Iriarte, José Luis; Rebolledo, Lorena; Pantoja, Silvio

doi:10.1016/j.csr.2010.08.008

Cited by 88 publications

(64 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We have no direct estimates of PP during sampling, but considering the climatological distribution of surface chlorophyll from satellite data (Thomas et al, 2001;Yuras et al, 2005), no enhanced PP is found between 20 • and 10 • S, and none in comparison with the region further south (Farías et al, 2009b;Fernandez et al, 2009;Aracena et al, 2011). The most widespread and biologically productive areas are found over the continental shelf between 42 • -50 • S, 32 • -37 • S, and 0 • -10 • S (Kellog and Mohriak, 2001).…”

Section: Resultsmentioning

confidence: 99%

On the Nitrous Oxide Accumulation in Intermediate Waters of the Eastern South Pacific Ocean

Carrasco

Karstensen

2017

Front. Mar. Sci.

View full text Add to dashboard Cite

because N 2 O and AOU do not follow a linear trend, we suspect that, in addition to nitrification, denitrification also takes place in N 2 O cycling. By making use of water mass mixing analyses, we show that an increase in N 2 O occurs in the region where high oxygen from AAIW merges with low oxygen from Equatorial Subsurface Water (ESSW), creating favorable conditions for local N 2 O production. We conclude that the non-linearity in the relationship between N 2 O and O 2 is a result of mixing between two water masses with very different source characteristics, paired with the different time frames of nitrification and denitrification processes that impact water masses en route before they finally meet and mix in the ESP region.

show abstract

Section: Resultsmentioning

confidence: 99%

On the Nitrous Oxide Accumulation in Intermediate Waters of the Eastern South Pacific Ocean

Carrasco

Karstensen

2017

Front. Mar. Sci.

View full text Add to dashboard Cite

show abstract

“…The surface layers (0-50 m) of the Baker and Eyre Fjords and along both longitudinal transects were well oxygenated, generally above 6 mL L -1 (>90% saturation; Fig. 2C and F), due to photosynthetic processes (Aracena et al 2011) and ocean-atmosphere oxygen exchange. Beneath the highly oxygenated surface layer, dissolved oxygen concentrations dropped below 4 mL L -1 (<50% saturation), presumably due to consumption caused by the degradation of autochthonous and allochthonous particulate organic matter coming from the surface layer and river discharge (Silva 2008).…”

Section: Hydrographic Characteristicsmentioning

confidence: 99%

Horizontal and vertical distributions of siphonophores in relation to oceanographic conditions in Chilean Patagonian fjords

Palma¹,

Retamal²,

Silva³

et al. 2014

Sci. Mar.

View full text Add to dashboard Cite

Summary:Siphonophores collected in Chilean Patagonian fjords, between the Gulf of Penas and the Trinidad Channel in 2008 were analysed. A total of 12 species were recorded, of which Muggiaea bargmannae, Lensia subtilis, Praya dubia and Sphaeronectes fragilis were identified for the first time in this sector of the Patagonian fjords. M. bargmannae represents a new record for the southeastern Pacific. The most abundant species were Muggiaea atlantica (78.6%), Lensia conoidea (8.7%) and Dimophyes arctica (8.5%). M. atlantica, the dominant species, showed high densities in both oceanic and interior waters. L. conoidea and D. arctica, on the other hand, were principally collected in interior waters. M. atlantica was collected in less saline (<30), more oxygenated (6-7 mL L -1 ) shallow strata (0-50 m), while L. conoidea and D. arctica were collected below 50 m depth in more saline (30-33) and less oxygenated (4-6 mL L -1 ) waters. The eudoxids of these species followed the same horizontal and vertical distribution patterns as their polygastric stages. These results confirm the success of M. atlantica in the colonization of all the southern fjords and document an increase with respect to the results obtained for the same geographical area in the spring of 1996. They also allowed us to infer that salinity and dissolved oxygen vertical gradients play an important role in determining the depth distribution patterns of these species.Keywords: siphonophores; gelatinous zooplankton; horizontal distribution; vertical distribution; Chilean Patagonian fjords. Distribución horizontal y vertical de los sifonóforos en relación con las condiciones oceanográficas en fiordos patagónicos chilenosResumen: Se analizaron los sifonóforos muestreados en fiordos patagónicos chilenos, entre el golfo de Penas y canal Trinidad en primavera de 2008. Se identificó un total de 12 especies, de las cuales Muggiaea bargmannae, Lensia subtilis, Praya dubia y Sphaeronectes fragilis fueron registrados por primera vez en este sector de fiordos patagónicos. M. bargmannae constituye un nuevo registro de sifonóforos en el Pacífico suroriental. Las especies más abundantes fueron Muggiaea atlantica (78.6%), Lensia conoidea (8.7%) y Dimophyes arctica (8.5%). M. atlantica, la especie dominante, mostró altas densidades tanto en aguas oceánicas como interiores. Por otra parte, L. conoidea y D. arctica se colectaron principalmente en aguas interiores. Las eudoxias de estas especies siguieron los mismos patrones de distribución horizontal que sus fases poligástricas. M. atlantica se encontró en aguas menos salinas (<30) y más oxigenadas (6-7 mL L -1 ) en el estrato superficial (0-50 m), mientras que L. conoidea y D. arctica se colectaron bajo los 50 m de profundidad en aguas más salinas (30-33) y menos oxigenadas (4-6 mL L -1 ). Estos resultados confirman el éxito de M. atlantica en la colonización de todos los fiordos australes y su incremento respecto a resultados obtenidos en la misma área geográfica en primavera de 1996.Palabras clave: sifonóforos; zooplancto...

show abstract

“…The Chilean fjord system receives organic matter input in the form of marine primary production and land-6 plant remains carried from the surrounding native forests by rivers and overland runoff. In addition, some shallow and semi-restricted areas evidence the anthropogenic impact of salmon farming activities (Soto and Norambuena, 2004 (Aracena et al, this issue;Gonzalez et al, this issue;Pizarro et al, 2005;). A decrease in primary production is observed from the mouth of Moraleda Channel in the north to the Elefantes Gulf in the south, whereas the vertical flux of organic carbon at 50 meters is nearly twice as high in spring than in winter (González et al, this issue).…”

mentioning

confidence: 99%

Sources and distribution of organic matter in northern Patagonia fjords, Chile (∼44–47°S): A multi-tracer approach for carbon cycling assessment

Sepúlveda

Pantoja

Hughen

2011

Continental Shelf Research

Self Cite

View full text Add to dashboard Cite

We investigated the provenance of organic matter in the inner fjord area of northern Patagonia, Chile (~44-47° S), by studying the elemental (organic carbon, total nitrogen), isotopic (δ 13 C, δ 15 N), and biomarker (n-alkanoic acids from vascular plant waxes) composition of surface sediments as well as local marine and terrestrial organic matter.Average end-member values of N/C, δ 13 C, and δ 15 N from organic matter were 0.127 ± 0.010, -19.8 ± 0.3‰, and 9.9 ± 0.5‰ for autochthonous (marine) sources and 0.040 ± 0.018, -29.3 ± 2.1‰, 0.2 ± 3.0‰ for allochthonous (terrestrial) sources. Using a mixing equation based on these two end-members, we calculated the relative contribution of marine and terrestrial organic carbon from the open ocean to the heads of fjords close to river outlets. The input of marine-derived organic carbon varied widely and accounted for 13 to 96% (average 61%) of the organic carbon pool of surface sediments. Integrated regional calculations for the inner fjord system of northern Patagonia, which encompasses an area of ~ 4,280 km 2 , suggest that carbon accumulation may account for between 2.3 and 7.8 x 10 4 ton C yr -1 . This represents a storage capacity of marine-derived carbon between 1.8 and 6.2 x 10 4 tons yr -1 , which corresponds to an assimilation rate of CO 2 by marine photosynthesis between 0.06 and 0.23 x 10 6 tons yr -1 . This rate suggests that the entire fjord system of Patagonia, which covers an area of ~ 240,000 km 2 , may represent a potentially important region for the global burial of marine organic matter and the sequestration of atmospheric CO 2 .

show abstract

Latitudinal patterns of export production recorded in surface sediments of the Chilean Patagonian fjords (41–55°S) as a response to water column productivity

Cited by 88 publications

References 47 publications

On the Nitrous Oxide Accumulation in Intermediate Waters of the Eastern South Pacific Ocean

On the Nitrous Oxide Accumulation in Intermediate Waters of the Eastern South Pacific Ocean

Horizontal and vertical distributions of siphonophores in relation to oceanographic conditions in Chilean Patagonian fjords

Sources and distribution of organic matter in northern Patagonia fjords, Chile (∼44–47°S): A multi-tracer approach for carbon cycling assessment

Contact Info

Product

Resources

About