Effects of an invasive mussel, Arcuatula senhousia, on local benthic consumers: a laboratory 13C‐labeling study
- 331 Downloads
Filter-feeding bivalves play an important ecological role in aquatic systems through benthic–pelagic coupling. However, the mechanisms by which invasive mussels influence the food uptake by local consumers are little known. We tested the interactive effects of the invasive mussel Arcuatula senhousia and the native clam Ruditapes decussatus on the uptake of 13C-enriched microalgae, Isochrysis sp., by two polychaetes, the surface deposit feeder Cirriformia tentaculata and the sub-surface deposit feeder Phylo foetida. Polychaetes were exposed to two different densities of A. senhousia and R. decussatus used alone or together. In each treatment, the 13C-concentration throughout the sediment horizon (0–0.5, 0.5–2.5 and 2.5–5 cm) was also quantified. Results showed that, irrespective of bivalve densities, the 13C-uptake by C. tentaculata was lower in the presence of the two bivalves together than in the presence of one bivalve species (either A. senhousia or R. decussatus). This was consistent with decreased 13C-concentrations in the 0–0.5 cm sediment layer in the treatment with the two bivalves together. Contrary to C. tentaculata, no changes were observed among treatments in the 13C-uptake by P. foetida. This possibly reflected a limited 13C-enrichment of the lower sediment layers. Our main findings are: (1) A. senhousia reduces the 13C-uptake by R. decussatus, and (2) A. senhousia reduces the availability of phytoplankton-derived C for deposit feeders by impairing the feeding, incorporation and bio-deposition of R. decussatus. We conclude that the interaction of A. senhousia with native bivalves needs to be taken into consideration in future food web studies.
KeywordsPhytoplankton Bivalve Polychaete Algal Cell Deposit Feeder
The authors are grateful to Elena Maggi, Lisandro Benedetti-Cecchi, Tasman Crowe and Giovanni De Falco for their comments and discussion during various stages of this work, and to Giovanni Fenzi, Andrea Satta and Fabio Antognarelli for their help in the field and in the laboratory. We sincerely thank two anonymous reviewers for their helpful comments on the manuscript. This work is a contribution to the EU FP7 project VECTORS (Vectors of Change in Oceans and Seas Marine Life, Impact on Economic Sectors; Grant Agreement No. 266445) and to the Flagship Project RITMARE—The Italian Research for the Sea—coordinated by the Italian National Research Council within the National Research Program 2011–2013.
- Amouroux JM, Amourous J, Bastide J, Cachet G (1990) Interrelations in a microcosm with a suspension-feeder and a deposit-feeder. 1: experimental study. Oceanol Acta 13:61–68Google Scholar
- Cannas A (2010) Dinamica di popolazione di Ruditapes decussatus (L) e insediamento di Ruditapes philippinarum (Adam & Reeve) in Sardegna (Italia). Ph.D. thesis, Università degli Studi di Cagliari, Italy (in Italian)Google Scholar
- DAISIE (2009) European Invasive Alien Species Gateway. www.europe-aliens.org/. Accessed 27 Nov 2015
- Helm MM, Bourne N (2004) Hatchery culture of bivalves: a practical manual. FAO Fisheries Technical Paper 471. FAO, Rome, 201 ppGoogle Scholar
- Kushner RB (2005) The effects of the introduced Asian mussel Musculista senhousia in native bivalve growth and survival in Southern California. PhD dissertation, San Diego State UniversityGoogle Scholar
- Newell RIE (2004) Ecosystem influences of natural and cultivated populations of suspension-feeding bivalve molluscs: a review. J Shellfish Res 23:51–61Google Scholar
- Underwood AJ (1997) Experiments in ecology. Their logical design and interpretation using analysis of variance. Cambridge University Press, CambridgeGoogle Scholar