Learning from crises? The long and winding road of the salmon industry in Chiloé Island, Chile

Billi, Marco; Mascareño, Aldo; Henríquez, Pablo A.; Rodríguez, Ignacia; Padilla, Felipe; Ruz, Gonzalo A.

doi:10.1016/j.marpol.2022.105069

Cited by 5 publications

(2 citation statements)

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“…Finally, most published manuscripts hypothesize and discuss the processes favoring deoxygenation inside 100 Patagonian fjords but never show any quantification. The Patagonian fjord ecosystem is under substantial continued economic pressure, with salmon aquaculture occupying the first position, with a national production of ~1,000,000 tons of salmon in 2019 (Billi et al, 2022). The northern Patagonian fjord (a region similar to the study area; Figure 1b, 1c) reported half of the national production and a significant number of salmon concessions (Billi et al, 2022).…”

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confidence: 91%

“…The Patagonian fjord ecosystem is under substantial continued economic pressure, with salmon aquaculture occupying the first position, with a national production of ~1,000,000 tons of salmon in 2019 (Billi et al, 2022). The northern Patagonian fjord (a region similar to the study area; Figure 1b, 1c) reported half of the national production and a significant number of salmon concessions (Billi et al, 2022). A risk analysis carried out in this region established that the Reloncaví estuarine system, and the Comau, Puyuhuapi, 105 Quitralco, and Cupquelan fjords are regions with an especially elevated level of risk for the development of harmful https://doi.org/10.5194/egusphere-2023-706 Preprint.…”

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confidence: 99%

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Oceanographic Processes Favoring Deoxygenation Inside Patagonian Fjords

Linford

Peréz-Santos

Montero

et al. 2023

Preprint

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Abstract. The dissolved oxygen (DO) levels of oceanic-coastal waters has decreased over the last decade owing to the increase in surface water temperature caused by climate change. In addition, biological and human activity in coastal zones, bays, and estuaries has contributed to the acceleration of current deoxygenation. The Patagonian fjord and channel system is one world region where low DO water (LDOW, 30 %–60 % oxygen saturation) and hypoxia conditions (< 30 % oxygen saturation, 2 ml L−1 or 89.2 µmol L−1) is observed. An in-situ data set of hydrographic and biogeochemical parameters (2017 stations), collected from sporadic oceanographic cruises between 1970 and 2021, was used to quantify the mechanism involved in the presence of LDOW and hypoxic conditions in northern Patagonian fjords. Results denoted two main areas with LDOW (e.g., Puyuhuapi Fjord-Jacaf channel, Comau Fjord, and the Reloncaví estuarine system) extending from 25–400 m depth. Simultaneously, hypoxia was recorded in the Puyuhuapi Fjord, Jacaf Channel, and Quitralco Fjord. Quitralco registered the lowest values of DO (9.36 µmol L−1 and 1.6 % oxygen saturation) of the entire Patagonian fjord system. Areas of LDOW and hypoxia coincided with the accumulation of inorganic nutrients. Water mass analysis confirmed the contribution of equatorial subsurface water in the advection of the LDOW to only the Puyuhuapi Fjord and Jacaf Channel. In addition, in Puyuhuapi Fjord, hypoxic conditions occurred when the community respiration rate (6.6 g C m−2d−1) exceeded the gross primary production estimate (1.9 g C m−2d−1) possibly due to the increased consumption of DO during the use of both autochthonous and allochthonous organic matter. Biogeochemical processes and circulation regimens also contribute to deoxygenation and will be part of the discussion of the present research.

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confidence: 91%

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confidence: 99%