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<p>The feeding ecology of invasive species provides essential information on trophic interactions within invaded ecosystems. This study evaluated the feeding ecology of the invasive swimming crab <i>Charybdis (Charybdis) hellerii</i> (A. Milne Edwards, 1867) from a sexual, ontogenetic, and seasonal perspective in Southern Brazil. We collected 410 individuals between May 2021 and April 2022, once a month, using Jereré-type traps (top-opening traps, with 10&#xa0;mm mesh size, baited with fresh fish). The Feeding Index (IAi) was calculated using the frequency of occurrence and the proportion of each prey in the stomach. The invasive population consumes mostly Crustacea and Mollusca, and did not show a significant difference in the feeding consumption pattern between males and females, among ontogenetic development stages, nor throughout the year. The absence of diet variation among different individuals from the invasive population might represent a good strategy for invasion success because all individuals are able to feed on the most available prey items in the region. This is an important result because the invasive population is well adapted and growing in ecosystems that host a large diversity of native crabs, essential for aquaculture and fishing, that might be threatened by the invader.</p>

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Feeding ecology of an invasive swimming crab: how feeding patterns favors invasion success

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • Vinícius Soares Correa da Costa,
  • Vivian de Mello Cionek,
  • Joaquim Olinto Branco

摘要

The feeding ecology of invasive species provides essential information on trophic interactions within invaded ecosystems. This study evaluated the feeding ecology of the invasive swimming crab Charybdis (Charybdis) hellerii (A. Milne Edwards, 1867) from a sexual, ontogenetic, and seasonal perspective in Southern Brazil. We collected 410 individuals between May 2021 and April 2022, once a month, using Jereré-type traps (top-opening traps, with 10 mm mesh size, baited with fresh fish). The Feeding Index (IAi) was calculated using the frequency of occurrence and the proportion of each prey in the stomach. The invasive population consumes mostly Crustacea and Mollusca, and did not show a significant difference in the feeding consumption pattern between males and females, among ontogenetic development stages, nor throughout the year. The absence of diet variation among different individuals from the invasive population might represent a good strategy for invasion success because all individuals are able to feed on the most available prey items in the region. This is an important result because the invasive population is well adapted and growing in ecosystems that host a large diversity of native crabs, essential for aquaculture and fishing, that might be threatened by the invader.