Diet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem

Abstract The occurrence of the signal crayfish Pacifastacus leniusculus in the Valla Stream was the first established population of this invasive species recorded in an Italian stream ecosystem. We evaluated the seasonality of diet and trophic niche of invasive signal crayfish in order to estimate t...

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Autores principales:	Fabio Ercoli, Daniela Ghia, Laura Gruppuso, Gianluca Fea, Tiziano Bo, Timo J. Ruokonen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b850e950e4af4d5a9a1081f28073b872
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spelling	oai:doaj.org-article:b850e950e4af4d5a9a1081f28073b8722021-12-02T17:32:59ZDiet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem10.1038/s41598-021-88073-22045-2322https://doaj.org/article/b850e950e4af4d5a9a1081f28073b8722021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88073-2https://doaj.org/toc/2045-2322Abstract The occurrence of the signal crayfish Pacifastacus leniusculus in the Valla Stream was the first established population of this invasive species recorded in an Italian stream ecosystem. We evaluated the seasonality of diet and trophic niche of invasive signal crayfish in order to estimate the ecological role and effects on native communities of the stream ecosystem. We studied the differences in food source use between sexes, life stages and seasons using carbon and nitrogen stable isotope analyses. To supplement stable isotope analyses, we evaluated food source usage using traditional stomach content analysis. We tested the hypothesis that juveniles have a different diet, showing different trophic niches, compared to adults. Results indicated that signal crayfish adult and juvenile diets mainly rely on macroinvertebrates and periphyton in summer, shifting to mostly periphyton in autumn. Although the two age classes occupied an equivalent trophic niche, juveniles showed slightly different carbon isotope values, suggesting a somewhat ontogenetic shift consistent among seasons. No significant differences were found in adult and juvenile diets between summer and autumn seasons. Our findings suggest that signal crayfish juveniles and adults exhibited seasonal feeding habits, probably due to ecological behaviour rather than food resource availability, and that both are likely to impose similar effects on macroinvertebrate communities in this and similar stream ecosystems.Fabio ErcoliDaniela GhiaLaura GruppusoGianluca FeaTiziano BoTimo J. RuokonenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Fabio Ercoli Daniela Ghia Laura Gruppuso Gianluca Fea Tiziano Bo Timo J. Ruokonen Diet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem
description	Abstract The occurrence of the signal crayfish Pacifastacus leniusculus in the Valla Stream was the first established population of this invasive species recorded in an Italian stream ecosystem. We evaluated the seasonality of diet and trophic niche of invasive signal crayfish in order to estimate the ecological role and effects on native communities of the stream ecosystem. We studied the differences in food source use between sexes, life stages and seasons using carbon and nitrogen stable isotope analyses. To supplement stable isotope analyses, we evaluated food source usage using traditional stomach content analysis. We tested the hypothesis that juveniles have a different diet, showing different trophic niches, compared to adults. Results indicated that signal crayfish adult and juvenile diets mainly rely on macroinvertebrates and periphyton in summer, shifting to mostly periphyton in autumn. Although the two age classes occupied an equivalent trophic niche, juveniles showed slightly different carbon isotope values, suggesting a somewhat ontogenetic shift consistent among seasons. No significant differences were found in adult and juvenile diets between summer and autumn seasons. Our findings suggest that signal crayfish juveniles and adults exhibited seasonal feeding habits, probably due to ecological behaviour rather than food resource availability, and that both are likely to impose similar effects on macroinvertebrate communities in this and similar stream ecosystems.
format	article
author	Fabio Ercoli Daniela Ghia Laura Gruppuso Gianluca Fea Tiziano Bo Timo J. Ruokonen
author_facet	Fabio Ercoli Daniela Ghia Laura Gruppuso Gianluca Fea Tiziano Bo Timo J. Ruokonen
author_sort	Fabio Ercoli
title	Diet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem
title_short	Diet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem
title_full	Diet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem
title_fullStr	Diet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem
title_full_unstemmed	Diet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem
title_sort	diet and trophic niche of the invasive signal crayfish in the first invaded italian stream ecosystem
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b850e950e4af4d5a9a1081f28073b872
work_keys_str_mv	AT fabioercoli dietandtrophicnicheoftheinvasivesignalcrayfishinthefirstinvadeditalianstreamecosystem AT danielaghia dietandtrophicnicheoftheinvasivesignalcrayfishinthefirstinvadeditalianstreamecosystem AT lauragruppuso dietandtrophicnicheoftheinvasivesignalcrayfishinthefirstinvadeditalianstreamecosystem AT gianlucafea dietandtrophicnicheoftheinvasivesignalcrayfishinthefirstinvadeditalianstreamecosystem AT tizianobo dietandtrophicnicheoftheinvasivesignalcrayfishinthefirstinvadeditalianstreamecosystem AT timojruokonen dietandtrophicnicheoftheinvasivesignalcrayfishinthefirstinvadeditalianstreamecosystem
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Diet and trophic niche of the invasive signal crayfish in the first invaded Italian stream ecosystem

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