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Title: Plankton Community Changes From Warm to Cold Winters in the Oligotrophic Subtropical Ocean
Authors: Armengol, Laia 
Franchy, Gara
Ojeda, Alicia 
Hernández-León, Santiago 
UNESCO Clasification: 2510 Oceanografía
Keywords: Late Winter Bloom
Oligotrophic Waters
Tunneling Effect
Issue Date: 2020
Project: Ciclos Lunares y Fertilización Con Hierro. 
Biomasa y Flujo Activo en la Zona Batipelágica 
Tropical and South Atlantic - climate-based marine ecosystem prediction for sustainable management 
Journal: Frontiers in Marine Science 
Abstract: Subtropical gyres are large areas of the ocean characterized by high stratification, low nutrients, and low primary production. The Canary Current System (CanCS) shows a rather strong seasonal thermocline during most of the annual cycle, which erodes through convective mixing from January to March promoting the so-called Late Winter Bloom (LWB). Atmospheric deposition from the Sahara desert is also another key feature of the CanCS providing additional nutrients to the euphotic zone. As a consequence of global warming, these oligotrophic regimes systems are expanding and the temperature increase affects phytoplankton, and reverberate on the food web structure and biogeochemical cycles. In the CanCS, the effect of warming and dust deposition on the planktonic community remains poorly know. Here, we show the effects of a 0.5°C increase in ocean temperature during two consecutive years. During 2011, winter temperature allowed the development of the LWB, promoting the increase of autotrophic cells and the coexistence of the microbial loop and the “classic” trophic web. The former predominated before and after the LWB, while the latter prevailed during the LWB. The rather high temperature during 2010 prevented the LWB development, causing highly oligotrophic conditions and episodic events of Saharan dust contributing to nutrient inputs. During this warm year, we found a dominance of small cells such as nanoflagellates and dinoflagellates, and surprisingly high biomass of mesozooplankton, hinting at the “tunneling effect” as an alternative trophic pathway (rapid uptake of phosphate by prokaryotes which are consumed by flagellates and then by zooplankton). These changes show the impact of a slight increase in temperature in this oligotrophic system and how future scenarios in the context of global warming could promote considerable shifts in the trophic web structure.
ISSN: 2296-7745
DOI: 10.3389/fmars.2020.00677
Source: Frontiers in Marine Science [EISSN 2296-7745], v. 7, artículo 677 (Agosto 2020)
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