Journal
MARINE POLLUTION BULLETIN
Volume 127, Issue -, Pages 342-351Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2017.12.024
Keywords
Mytilus chilensis; Volcanic ash; Physiological responses; Weight loss; Suspension-feeding; Mussels; Clearance rate; Oxygen consumption rate
Funding
- Fondo Nacional de Investigation Cientifica y Tecnologica, Fondecyt-Chile [1141052]
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Ashes settling into the sea from volcanic explosions expose suspension-feeding species to reduced seston quality. Adults and juveniles of the mussel Mytilus chilensis were exposed for 15 days to the phytoplankton Isochrysis galbana together with various concentrations of ashes. We then quantified impact on survival and physiology. Although no individuals died during the experiment, by the end of the study clearance rates and oxygen consumption rates had decreased substantially, and tissue weight of mussels exposed to the highest ash concentrations declined substantially. Gills showed no physical damage, but did show abundant mucus secretion in response to ash particles. Moreover, as the relative proportions of microalgae to ash in the diet decreased, individuals showed increasing preferential ingestion of microalgal particles. Increased ash content in the diet altered physiological rates and activated distinct particle selection with a high production of pseudofeces and high energy costs, with potential long-term consequences.
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