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Massive salp outbreaks in the inner sea of Chiloé Island (Southern Chile): possible causes and ecological consequences
Citation
Giesecke, R and Clement, A and Garces-Vargas, J and Mardones, JI and Gonzalez, HE and Caputo, L and Castro, L, Massive salp outbreaks in the inner sea of Chiloe Island (Southern Chile): possible causes and ecological consequences, Latin American Journal of Aquatic Research, 42, (3) pp. 604-621. ISSN 0718-560X (2014) [Refereed Article]
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Copyright Statement
Copyright 2014 Latin American Journal of Aquatic Research-Licensed under a Creative Commons Attribution-NonCommercial-NoDeris 3.0 Unported License. (CC BY-NC-ND 3.0)http://creativecommons.org/licenses/by-nc-nd/3.0/
DOI: doi:10.3856/vol42-issue3-fulltext-18
Abstract
During 2010 several massive salp outbreaks of the Subantarctic species Ihlea magalhanica were recorded in the inner sea of Chiloé Island (ISCh, Southern Chile), affecting both phytoplankton abundance and salmon farmers by causing high fish mortality. First outbreaks were recorded during February 2010 when Ihlea magalhanica reached up to 654,000 ind m-3 close to the net pens in Maillen Island and consecutive outbreaks could be followed during March and from October to November 2010. One month prior to the first recorded salp outbreak, the adjacent oceanic region and ISCh showed a sharp decline of ca. 1.0ºC in sea surface temperature and an atypical pattern of oceanic sea surface currents, changing from a predominantly meridional (northward) to a zonal (eastward) direction, probably causing a massive Subantarctic Water parcel to enter the ISCh. During the outbreaks, surface chlorophyll concentration decreased from an historical mean of 13.8 to less than 4 mg Chl-a m-3, and did not return to normal conditions throughout the entire year, and similar results were also observed in phytoplankton abundance. The abundance of salp aggregations were highest close to the salmon net pens, which acted as physical barriers, and may have favored the successful reproduction and persistence of the outbreaks during 2010. The possible impact of these outbreaks on phytoplankton quality and quantity, as well as potential scenarios for the development of further outbreaks is discussed.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | Ihlea magalhanica, outbreak, salmon mortality, Chiloé Island, southern Chile |
| Research Division: | Biological Sciences |
| Research Group: | Zoology |
| Research Field: | Invertebrate Biology |
| Objective Division: | Environment |
| Objective Group: | Flora, Fauna and Biodiversity |
| Objective Field: | Marine Flora, Fauna and Biodiversity |
| UTAS Author: | Mardones, JI (Mr Jorge Mardones) |
| ID Code: | 98617 |
| Year Published: | 2014 |
| Web of Science® Times Cited: | 7 |
| Deposited By: | Sustainable Marine Research Collaboration |
| Deposited On: | 2015-02-20 |
| Last Modified: | 2015-05-19 |
| Downloads: | 301 View Download Statistics |
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