Mussel Shells from Marine Aquaculture Act like Ecosystem Engineers: Legacy Effects on Benthic Communities

  1. Sanchez-Jerez, Pablo 14
  2. Casado-Coy, Nuria 1
  3. Souza Troncoso, Jesus 3
  4. Olabarria, Celia 3
  5. Valle-Pérez, Carlos 4
  6. Marí Such, Candela 4
  7. Sanz-Lázaro, Carlos 12
  1. 1 Multidisciplinary Institute for Environmental Studies (MIES), University of Alicante, 03690 Alicante, Spain
  2. 2 Department of Ecology, University of Alicante, 03690 Alicante, Spain
  3. 3 Centro de Investigación Mariña, Universidade de Vigo, EcoCost, Edificio CC Experimentais, Campus de Vigo, As Lagoas, Marcosende, 36310 Vigo, Spain
  4. 4 Department of Marine Science and Applied Biology, University of Alicante, 03690 Alicante, Spain
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Revista:
Coasts

ISSN: 2673-964X

Ano de publicación: 2023

Volume: 3

Número: 4

Páxinas: 328-344

Tipo: Artigo

DOI: 10.3390/COASTS3040020 GOOGLE SCHOLAR lock_openAcceso aberto editor

Outras publicacións en: Coasts

Obxectivos de Desenvolvemento Sustentable

Resumo

Ecosystem engineers are organisms that cause changes in the physical state of biotic and abiotic structures that modulate the availability of resources to other species, thus affecting biochemical cycles. Molluscs, especially bivalves such as mussels, are widespread in coastal environments and they are excellent ecosystem engineers because of the durability of their shells, which add complexity and heterogeneity to benthic environments. The presence of mussel farms favours the accumulation of shells in benthic environments and may influence surrounding bare sediments, with potential legacy effects on benthic communities. We studied the effects of the accumulation of mussel shells at finfish farms and mussel farms by experimentally comparing bare sediment and sediment with fragmented shells in terms of the abundance of the most relevant faunal groups, specifically polychaete families as well as physical–chemical variables in sediment water samples, specifically organic matter (OM), redox potential, and acid-volatile sulphides (AVS) NH4+ and PO43−. The experiment was replicated under two environmental conditions over a period of 35 days: eutrophic muddy sediments and oligotrophic sandy sediments. The OM and AVS values were significantly higher in the eutrophic sediment with mussel shells. Only NH4+ was positively affected by the mussel shells in the oligotrophic conditions. Differences between the two environments were observed, and the effect of the mussel shells on the polychaete assemblages was more significant in the oligotrophic conditions. Mussel shell accumulations affected the structure of benthic assemblages by modifying their heterogeneity and complexity, which suggests that the presence of mussel farms above bare sediment may affect ecosystem functioning. Aquaculture has potentially negative or positive effects that must be addressed on a large scale, considering the increased input of organic matter and also the simultaneous presence of mussel shell waste, both of which alter the surrounding environment. This is particularly important in oligotrophic sandy sediment.

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Financiadores

  • Spanish National Agency for Research
    • CGL2015-70136-R

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