Isotopic Niche and Trophic Position of the Invasive Portunid Portunus segnis Forskål, (1775) in Elounda Bay (Crete Island, Eastern Mediterranean)

Giorgio Mancinelli (), Thanos Dailianis, Costas Dounas, Panagiotis Kasapidis, Panayota Koulouri, Grigorios Skouradakis, Roberta Bardelli, Cristina Di Muri, Maria Teresa Guerra and Salvatrice Vizzini
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Giorgio Mancinelli: Department of Biological and Environmental Sciences and Technologies—DiSTeBA, University of Salento, SP Lecce-Monteroni, 73100 Lecce, Italy
Thanos Dailianis: Hellenic Centre for Marine Research—HCMR, Institute of Marine Biology, Biotechnology and Aquaculture—IMBBC, 71500 Heraklion, Greece
Costas Dounas: Hellenic Centre for Marine Research—HCMR, Institute of Marine Biology, Biotechnology and Aquaculture—IMBBC, 71500 Heraklion, Greece
Panagiotis Kasapidis: Hellenic Centre for Marine Research—HCMR, Institute of Marine Biology, Biotechnology and Aquaculture—IMBBC, 71500 Heraklion, Greece
Panayota Koulouri: Hellenic Centre for Marine Research—HCMR, Institute of Marine Biology, Biotechnology and Aquaculture—IMBBC, 71500 Heraklion, Greece
Grigorios Skouradakis: Hellenic Centre for Marine Research—HCMR, Institute of Marine Biology, Biotechnology and Aquaculture—IMBBC, 71500 Heraklion, Greece
Roberta Bardelli: Department of Earth and Marine Sciences—DiSTeM, University of Palermo, Via Archirafi 22, 90133 Palermo, Italy
Cristina Di Muri: Italian National Research Council, Institute of Research on Terrestrial Ecosystems—CNR-IRET, University of Salento, SP Lecce-Monteroni, 73100 Lecce, Italy
Maria Teresa Guerra: Department of Biological and Environmental Sciences and Technologies—DiSTeBA, University of Salento, SP Lecce-Monteroni, 73100 Lecce, Italy
Salvatrice Vizzini: Consorzio Nazionale Interuniversitario per le Scienze del Mare—CoNISMa, Piazzale Flaminio 9, 00196 Rome, Italy

Sustainability, 2022, vol. 14, issue 22, 1-17

Abstract: There is a growing recognition that an advanced understanding of the trophic characteristics of an invasive consumer can provide important information on its ecological impact. In recent years, the blue swimming crab Portunus segnis , one of the earliest Lessepsian invaders, has considerably expanded its distribution range in the Mediterranean Sea, yet, its trophic habits in invaded areas remain scarcely investigated. In this study, we used carbon and nitrogen stable isotopes analysis (SIA) to determine the trophic position and isotopic niche of the crab compared with other representatives of the flora and fauna occurring in Elounda Bay (Crete). P. segnis showed a trophic position of 3.9, higher than the values determined by SIA or conventional gut content analysis in other areas of the Mediterranean Sea or in the native range. Crab specimens showed a high inter-individual variability in both δ 13 C and δ 15 N values; further analysis indicated negligible differences in the isotopic niche of adult males and females. Conversely, δ 15 N values were significantly related to the size of the specimens, ultimately suggesting an ontogenetic dietary shift. This study represents the first attempt to characterize the trophic habits of the blue swimming crab in the context of an invaded food web and may contribute to the implementation of long-term management strategies of control and mitigation of its ecological impact.

Keywords: non-indigenous species; blue swimming crab; trophic ecology; stable isotopes; trophic level; diet plasticity (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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