Winter and summer distribution of dissolved oxygen, pH and nutrients at the heads of fjords in Chilean Patagonia with possible phosphorus limitation

Prado-Fiedler, Roberto

doi:10.4067/s0718-19572009000300024

Cited by 8 publications

(7 citation statements)

References 6 publications

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“…The freshwater outflow is compensated by the inflow of (2) Subantarctic oceanic water (Palma & Silva, 2004; Valle-Levinson et al, 2007) constituting an intermediate layer. Below 300 m we found (3) a water mass with a longer residence time in the fjord (Farmer & Freeland, 1983) showing higher salinity and temperature and lower pH and oxygen due to decomposition processes in the lower water column and fjord bottom (Prado-Fiedler, 2009; Silva, 2008). The 300 m isobath is also the one separating the deep Comau Fjord from the shallower parts of the adjacent Golfo de Ancud (Fig.…”

Section: Discussionmentioning

confidence: 99%

Vertical and horizontal distribution ofDesmophyllum dianthusin Comau Fjord, Chile: a cold-water coral thriving at low pH

Fillinger

Richter

2013

PeerJ

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Cold-water corals provide an important habitat for a rich fauna along the continental margins and slopes. Although these azooxanthellate corals are considered particularly sensitive to ocean acidification, their responses to natural variations in pH and aragonite saturation are largely unknown due to the difficulty of studying their ecology in deep waters. Previous SCUBA investigations have shown an exceptionally shallow population of the cold-water coral Desmophyllum dianthus in near-surface waters of Comau Fjord, a stratified 480 m deep basin in northern Chilean Patagonia with suboxic deep waters. Here, we use a remotely operated vehicle to quantitatively investigate the distribution of D. dianthus and its physico-chemical drivers in so far uncharted naturally acidified waters. Remarkably, D. dianthus was ubiquitous throughout the fjord, but particularly abundant between 20 and 280 m depth in a pH range of 8.4 to 7.4. The persistence of individuals in aragonite-undersaturated waters suggests that present-day D. dianthus in Comau Fjord may show pre-acclimation or pre-adaptation to conditions of ocean acidification predicted to reach over 70% of the known deep-sea coral locations by the end of the century.

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Section: Discussionmentioning

confidence: 99%

Vertical and horizontal distribution ofDesmophyllum dianthusin Comau Fjord, Chile: a cold-water coral thriving at low pH

Fillinger

Richter

2013

PeerJ

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“…With extremely high Fe input into these catchments, NO 3 limitation might be expected year-round. However, PO 4 limitation is also plausible close to glaciers in strongly stratified fjords (Prado-Fiedler, 2009), due to the low availability of PO 4 in freshwater rel-ative to NO 3 (Ren et al, 2019). Conversely, in the Southern Ocean, it is possible that Fe-limited conditions occur extremely close to glaciers and ice shelves (Fig.…”

Section: Contrasting Fe-and No 3 -Limited Regions Of the Oceanmentioning

confidence: 99%

Review article: How does glacier discharge affect marine biogeochemistry and primary production in the Arctic?

et al. 2020

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Abstract. Freshwater discharge from glaciers is increasing across the Arctic in response to anthropogenic climate change, which raises questions about the potential downstream effects in the marine environment. Whilst a combination of long-term monitoring programmes and intensive Arctic field campaigns have improved our knowledge of glacier–ocean interactions in recent years, especially with respect to fjord/ocean circulation, there are extensive knowledge gaps concerning how glaciers affect marine biogeochemistry and productivity. Following two cross-cutting disciplinary International Arctic Science Committee (IASC) workshops addressing the importance of glaciers for the marine ecosystem, here we review the state of the art concerning how freshwater discharge affects the marine environment with a specific focus on marine biogeochemistry and biological productivity. Using a series of Arctic case studies (Nuup Kangerlua/Godthåbsfjord, Kongsfjorden, Kangerluarsuup Sermia/Bowdoin Fjord, Young Sound and Sermilik Fjord), the interconnected effects of freshwater discharge on fjord–shelf exchange, nutrient availability, the carbonate system, the carbon cycle and the microbial food web are investigated. Key findings are that whether the effect of glacier discharge on marine primary production is positive or negative is highly dependent on a combination of factors. These include glacier type (marine- or land-terminating), fjord–glacier geometry and the limiting resource(s) for phytoplankton growth in a specific spatio-temporal region (light, macronutrients or micronutrients). Arctic glacier fjords therefore often exhibit distinct discharge–productivity relationships, and multiple case-studies must be considered in order to understand the net effects of glacier discharge on Arctic marine ecosystems.

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“…With extremely high Fe input into these catchments, NO 3 limitation might be expected year-round. However, PO 4 limitation is also plausible close to glaciers in strongly-stratified fjords, due to the low availability of PO 4 in freshwater (Prado-Fiedler, 2009). Conversely, in the Southern Ocean, it is possible that Felimited conditions occur extremely close to glaciers and ice shelves (Fig.…”

Section: Contrasting Fe and No 3 Limited Regions Of The Oceanmentioning

confidence: 99%

“…where inorganic PO 4 concentrations are potentially low enough to limit primary production (Prado-Fiedler, 2009), this process may be particularly important-yet is also understudied in glaciated catchments (Stibal et al, 2009).…”

Section: Organic Matter In Glacial Dischargementioning

confidence: 99%

Review Article: How does glacier discharge affect marine biogeochemistry and primary production in the Arctic?

Hopwood¹,

Carroll²,

Dunse³

et al. 2019

Preprint

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Abstract. Freshwater discharge from glaciers is increasing across the Artic in response to anthropogenic climate change, which raises questions about the potential downstream effects in the marine environment. Whilst a combination of long-term monitoring programmes and intensive Arctic field campaigns have improved our knowledge of glacier-ocean interactions in recent years, especially with respect to fjord/ocean circulation in the marine environment, there are extensive knowledge gaps concerning how glaciers affect marine biogeochemistry and productivity. Following two cross-cutting disciplinary International Arctic Science Committee (IASC) workshops addressing ‘The importance of glaciers for the marine ecosystem’, here we review the state of the art concerning how freshwater discharge affects the marine environment with a specific focus on marine biogeochemistry and biological productivity. Using a series of Arctic case studies (Nuup Kangerlua/Godthåbsfjord, Kongsfjorden, Bowdoin Fjord, Young Sound, and Sermilik Fjord), the interconnected effects of freshwater discharge on fjord-shelf exchange, nutrient availability, the carbonate system, and the microbial foodweb are investigated. Key findings are that whether the effect of glacier discharge on marine primary production is positive, or negative is highly dependent on a combination of factors. These include glacier type (marine- or land-terminating) and the limiting resource for phytoplankton growth in a specific spatiotemporal region (light, macronutrients or micronutrients). Glacier fjords therefore often exhibit distinct discharge-productivity relationships and multiple case-studies must be considered in order to understand the net effects of glacier discharge on Arctic marine ecosystems.

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Winter and summer distribution of dissolved oxygen, pH and nutrients at the heads of fjords in Chilean Patagonia with possible phosphorus limitation

Cited by 8 publications

References 6 publications

Vertical and horizontal distribution ofDesmophyllum dianthusin Comau Fjord, Chile: a cold-water coral thriving at low pH

Vertical and horizontal distribution ofDesmophyllum dianthusin Comau Fjord, Chile: a cold-water coral thriving at low pH

Review article: How does glacier discharge affect marine biogeochemistry and primary production in the Arctic?

Review Article: How does glacier discharge affect marine biogeochemistry and primary production in the Arctic?

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