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<p>The invasive mussel <i>Limnoperna fortunei</i> modifies native macroinvertebrate assemblages in South America, but the underlying mechanisms are understudied. We assessed mussel-derived effects over basal resource availability, and its consequences on benthic food web subsidies in the Uruguay river, considering less-studied indirect effects of this invasion. Benthic organic matter (OM) and periphyton biomasses were compared in contrasting in situ experimental scenarios: high density (HD) <i>vs.</i> low density (LD) of <i>L. fortunei</i>. We determined: (i) the origin of OM (planktonic <i>vs.</i> periphytic), and (ii) the contribution of OM and periphyton to macroinvertebrate biomass. An increase in OM was observed from the LD towards the HD scenario. Concomitantly, periphyton biomass strongly decreased. OM was similarly supported by periphytic and planktonic resources in LD, but became predominantly planktonic-derived in HD. Macroinvertebrate biomass was predominantly subsidized by OM in LD and by periphyton in HD, contrary to the expected according to resource availability. Thus, the increased OM promoted by the invasion seems to constitute a trophic bottleneck at the base of the web, limiting bottom-up energy transfer in food webs. This exemplifies the strength of indirect effects that invasions can trigger, beyond better-known direct bottom-up/top-down mechanisms, providing further perspectives on the complexity of impacts.</p>

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Golden mussel invasion alters basal resources promoting a trophic bottleneck in river food webs

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Ivana Silva,
  • Daniel E. Naya,
  • Ernesto Brugnoli,
  • Alejandro D’Anatro,
  • Franco Teixeira de Mello,
  • Nicolás Vidal,
  • Iván González-Bergonzoni

摘要

The invasive mussel Limnoperna fortunei modifies native macroinvertebrate assemblages in South America, but the underlying mechanisms are understudied. We assessed mussel-derived effects over basal resource availability, and its consequences on benthic food web subsidies in the Uruguay river, considering less-studied indirect effects of this invasion. Benthic organic matter (OM) and periphyton biomasses were compared in contrasting in situ experimental scenarios: high density (HD) vs. low density (LD) of L. fortunei. We determined: (i) the origin of OM (planktonic vs. periphytic), and (ii) the contribution of OM and periphyton to macroinvertebrate biomass. An increase in OM was observed from the LD towards the HD scenario. Concomitantly, periphyton biomass strongly decreased. OM was similarly supported by periphytic and planktonic resources in LD, but became predominantly planktonic-derived in HD. Macroinvertebrate biomass was predominantly subsidized by OM in LD and by periphyton in HD, contrary to the expected according to resource availability. Thus, the increased OM promoted by the invasion seems to constitute a trophic bottleneck at the base of the web, limiting bottom-up energy transfer in food webs. This exemplifies the strength of indirect effects that invasions can trigger, beyond better-known direct bottom-up/top-down mechanisms, providing further perspectives on the complexity of impacts.