2026-04-18T01:26:27Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2221372026-01-29T19:00:55Zcom_2072_1057col_2072_478777col_2072_478917

00925njm 22002777a 4500 dc Prado Villegas, Patricia author Baeta Alacio, Marc author Mestre, Estel author Solís, Marco Antonio author Sanahuja Piera, Ignasi author Gairín, Ignasi author Camps Castellà, Judith author Falco, Silvia author Ballesteros, Manuel (Ballesteros Vázquez) author 2025-07-10T11:09:45Z 2026-01-28T06:10:24Z 2024-01-29 2025-07-10T11:09:45Z The Ebro Delta has become a major blue crab (Callinectes sapidus) fishery area in the NW Mediterranean, but there is limited information on factors controlling the abundance of populations in open waters, a crucial habitat for ovigerous females. Here, we use a stable isotope approach (δ15N and δ13C), to assess blue crab trophic position, the potential consumption of food items using mixing models, and the isotopic niche overlap with local commercial species. For Octopus vulgaris, a potential blue crab key predator, a trophic enrichment experiment was also conducted to further assess predation control in wild populations. The blue crab showed 1.6 times higher trophic position than in other habitats of the Ebro Delta, and similar to that found in the harbor crab, Liocarcinus depurator, and several predatory fish. Additionally, the isotopic niche of blue crabs showed overlaps from 46.2 to 14.9% with native predators, and mixing models also suggest even dietary contributions throughout the food web. For O. vulgaris, field results showed a trophic position of 3.93, lower than that of blue crab, and lower δ15N signatures were also obtained in a captivity experiment drawing negative fractionation (−1.1‰). We conclude that high dietary contribution of animal prey might provide a high protein diet that could be crucial for allowing the maintenance of a large local population, but the overall functional trophic similarity could also disfavor local native species. The similarity between experimental fractionation and field differences between predator and prey (−1.6‰) suggests that predation of blue crab is possible, but further research is needed to clarify the metabolic routes involved in octopus δ15N fractionation. Crustacis Invasions biològiques Ebre, Delta de l' (Catalunya) Crustacea Biological invasions Ebro River Delta (Catalonia) Trophic role and predatory interactions between the blue crab Callinectes sapidus and native species in open waters of the Ebro Delta