Feeding preference of the native sea urchin Arbacia dufresnii in an environment invaded by the kelp Undaria pinnatifida

Autores/as

  • Lucia Epherra Centro para el Estudio de Sistemas Marinos (CESIMAR-CONICET)
  • Karen Castro Instituto de Biología de Organismos Marinos (IBIOMAR-CONICET)
  • Marianela Arijón 1-CESIMAR-CONICET, 2-Universidad Nacional de la Patagonia San Juan Bosco
  • Tamara Rubilar 1-CESIMAR-CONICET, 2-Universidad Nacional de la Patagonia San Juan Bosco
  • Enrique Morsan Centro de Investigación Aplicada y Transferencia Tecnológica en Recursos Marinos “Almirante Storni”, CONICET, Universidad Nacional del Comahue.

Palabras clave:

Food preference, echinoid, invasive kelp, Patagonia

Resumen

In Argentina, the invasive kelp Undaria pinnatifida has modified the benthic community of Nuevo Gulf, northern Patagonia, where it was first recorded and is currently showing advanced invasion. Arbacia dufresnii, an abundant generalist omnivore sea urchin, has fully incorporated U. pinnatifida into its diet. Since sea urchins can influence the structure and dynamics of benthic macroalgal assemblages, determining the importance of U. pinnatifida in the feeding preferences of A. dufresnii complements the evaluation of the modifications caused by this species. Thus, this study aimed to assess the feeding preference of A. dufresnii in an environment invaded by U. pinnatifida. We conducted feeding experiments to determine whether A. dufresnii feeds on different developmental stages of U. pinnatifida, and preference experiments of this invasive species against six macroalgal species abundant in the environment. Arbacia dufresnii consumed both blades and sporophylls of U. pinnatifida at all the developmental stages evaluated, showing a preference for blades over sporophylls. Arbacia dufresnii showed preference for U. pinnatifida only when it was offered together with species that possess defense mechanisms against herbivory. The lack of preference for other macroalgae species over U. pinnatifida suggests that this invasive species may alter resource use and thereby affect the trophic structure of native communities. These findings complement previous diet studies, corroborating the feeding plasticity of A. dufresnii, as well as its ability to adapt to newly available resources. This research enhances the understanding of the impacts caused by invasive macroalgal species through feeding ecology studies of native grazers.

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Publicado

2025-07-23