Potential retention effect at fish farms boosts zooplankton abundance

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Title: Potential retention effect at fish farms boosts zooplankton abundance
Authors: Fernandez-Jover, Damian | Toledo-Guedes, Kilian | Valero-Rodriguez, Juan Manuel | Fernandez-Gonzalez, Victoria | Sanchez-Jerez, Pablo
Research Group/s: Biología Marina
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada
Keywords: Aquaculture impact | Wild fauna | Fish early-life-stages | Zooplankton | Wild fish | Light trap
Knowledge Area: Zoología
Issue Date: 5-Nov-2016
Publisher: Elsevier
Citation: Estuarine, Coastal and Shelf Science. 2016, 181: 144-152. doi:10.1016/j.ecss.2016.08.015
Abstract: Coastal aquaculture activities influence wild macrofauna in natural environments due to the introduction of artificial structures, such as floating cages, that provide structural complexity in the pelagic system. This alters the abundance and distribution of the affected species and also their feeding behaviour and diet. Despite this, the effects of coastal aquaculture on zooplankton assemblages and the potential changes in their abundance and distribution remain largely unstudied. Traditional plankton sampling hauls between the farm mooring systems entail some practical difficulties. As an alternative, light traps were deployed at 2 farms in the SW Mediterranean during a whole warm season. Total zooplankton capture by traps at farms was higher than at control locations on every sampling night. It ranged from 3 to 10 times higher for the taxonomic groups: bivalvia, cladocera, cumacea, fish early-life-stages, gastropoda, polychaeta and tanaidacea; 10–20 times higher for amphipoda, chaetognatha, isopoda, mysidacea and ostracoda, and 22 times higher for copepoda and the crustacean juvenile stages zoea and megalopa. Permutational analysis showed significant differences for the most abundant zooplankton groups (copepoda, crustacean larvae, chaetognatha, cladocera, mysidacea and polychaeta). This marked incremental increase in zooplankton taxa at farms was consistent, irrespective of the changing environmental variables registered every night. Reasons for the greater abundance of zooplankton at farms are discussed, although results suggest a retention effect caused by cage structures rather than active attraction through physical or chemical cues.
URI: http://hdl.handle.net/10045/58077
ISSN: 0272-7714 (Print) | 1096-0015 (Online)
DOI: 10.1016/j.ecss.2016.08.015
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier Ltd.
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.ecss.2016.08.015
Appears in Collections:INV - BM - Artículos Científicos / Scientific Papers

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