Enhanced growth rates of the Mediterranean mussel in a coastal lagoon driven by groundwater inflow

Andrisoa, Aladin, Lartaud, Franck, Rodellas, Valentí, Neveu, Ingrid, and Stieglitz, Thomas C. (2019) Enhanced growth rates of the Mediterranean mussel in a coastal lagoon driven by groundwater inflow. Frontiers in Marine Science, 6. 753.

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Abstract

Groundwater discharge is today recognized as an important pathway for freshwater, nutrients and other dissolved chemical substances to coastal systems. While its effect on supporting primary production in coastal ecosystems is increasingly recognized, its impact on growth of animals at higher trophic level (primary and secondary consumers) is less well documented. Here, we investigate the impact of groundwater discharge on the growth of the Mediterranean mussel (Mytilus galloprovincialis) in a coastal lagoon. Growth rates and condition index (tissue weight/shell weight) of mussels growing at groundwater-exposed sites and at a control site in Salses-Leucate lagoon (France) were measured. The mussels in this lagoon produce circadian (daily rhythm) growth increments in their shell, as opposed to semi-diurnal increments in tidally influenced systems. Mussels from groundwater-influenced sites have higher growth rate and condition index compared to those from a control site. Importantly, growth rates from groundwater-influenced sites are amongst the highest rates reported for the Mediterranean region (41 ± 9 μm d⁻¹). The higher growth rates at groundwater-influenced sites are likely a consequence of both the higher winter temperatures of lagoon water as a result of groundwater discharging with relatively constant temperatures, and the groundwater-driven nutrient supply that increase the food availability to support mussel growth. Overall, this study demonstrates that groundwater discharge to Mediterranean lagoons provides favorable environmental conditions for fast growth of mussels of high commercial-quality.

Item ID: 61641
Item Type: Article (Research - C1)
ISSN: 2296-7745
Keywords: coastal lagoon, condition index, groundwater discharge, growth rate, Mediterranean mussel, Mytilus galloprovincialis
Copyright Information: © 2019 Andrisoa, Lartaud, Rodellas, Neveu and Stieglitz.
Funders: French National Research Agency (ANR), European Union Horizon 2020 (EU H2020)
Projects and Grants: ANR @RAction chair medLOC (ANR- 14-ACHN-0007-01), EU H2020 Marie Skłodowska- Curie Grant Agreement No 748896
Date Deposited: 04 May 2020 23:48
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050102 Ecosystem Function @ 50%
04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology @ 50%
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