Isotopic determination of the trophic ecology of a ubiquitous key species. The crab Liocarcinus depurator (Brachyura: Portunidae)
Knowledge of the trophic ecology of predators is key to understanding how they affect food web structure and ecosystem functioning. The harbour crab Liocarcinus depurator (L.) (Brachyura: Portunidae) is one of the most abundant decapod species in soft-bottom areas of the Mediterranean Sea and northe...
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Online Access: | http://hdl.handle.net/11573/954426 https://doi.org/10.1016/j.ecss.2017.04.013 |
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ftunivromairis:oai:iris.uniroma1.it:11573/954426 2024-02-27T08:43:47+00:00 Isotopic determination of the trophic ecology of a ubiquitous key species. The crab Liocarcinus depurator (Brachyura: Portunidae) CAREDDU, GIULIO CALIZZA, EDOARDO COSTANTINI, Maria Letizia ROSSI, Loreto Careddu, Giulio Calizza, Edoardo Costantini, Maria Letizia Rossi, Loreto 2017 STAMPA http://hdl.handle.net/11573/954426 https://doi.org/10.1016/j.ecss.2017.04.013 eng eng Elsevier Science place:Oxford info:eu-repo/semantics/altIdentifier/wos/WOS:000402494100011 volume:191 firstpage:106 lastpage:114 numberofpages:9 journal:ESTUARINE, COASTAL AND SHELF SCIENCE http://hdl.handle.net/11573/954426 doi:10.1016/j.ecss.2017.04.013 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85018517919 info:eu-repo/semantics/closedAccess coastal water food web trophic relationship detritus feeder stable isotope Tyrrhenian sea info:eu-repo/semantics/article 2017 ftunivromairis https://doi.org/10.1016/j.ecss.2017.04.013 2024-01-31T17:53:17Z Knowledge of the trophic ecology of predators is key to understanding how they affect food web structure and ecosystem functioning. The harbour crab Liocarcinus depurator (L.) (Brachyura: Portunidae) is one of the most abundant decapod species in soft-bottom areas of the Mediterranean Sea and northeast Atlantic Ocean. It is both a common prey and predator of commercial and non-commercial marine species and its predation pressure appears to have little effect on the subtidal community assemblage. However, there are few studies of its diet and little is known about its role in mediating energy flows in marine ecosystems. In this study, carbon (d13C) and nitrogen (d15N) stable isotope analysis (SIA) and Bayesian analytical tools were used to characterise the trophic niche of L. depurator and to quantify the most important prey supporting this species under various environmental conditions. Specimens of L. depurator, their potential prey and basal resources were collected from two different subtidal areas of the Gulf of Gaeta, one affected by human activities (north side) and the other seasonally influenced by freshwater inputs originating from the River Garigliano (south side). While there were differences between the two sampling areas in terms of the abundance and d15N and d13C values of the macrobenthic prey community, no differences in the d15N values and trophic position of L. depurator were observed. Specifically, Bayesian mixing models showed Polychaeta Errantia as the main source of crab diets in both areas. The observed differences in the d13C values and the analysis of trophic pathways also indicate that the terrestrial organic matter originating from the discharge of the River Garigliano was integrated along the food web up to L. depurator. Although this species is usually considered an opportunistic feeder, it appears to be highly selective and its trophic habits did not influence food web topology, which in contrast was found to be strongly influenced by River Garigliano discharge. Article in Journal/Newspaper Northeast Atlantic Sapienza Università di Roma: CINECA IRIS Estuarine, Coastal and Shelf Science 191 106 114 |
institution |
Open Polar |
collection |
Sapienza Università di Roma: CINECA IRIS |
op_collection_id |
ftunivromairis |
language |
English |
topic |
coastal water food web trophic relationship detritus feeder stable isotope Tyrrhenian sea |
spellingShingle |
coastal water food web trophic relationship detritus feeder stable isotope Tyrrhenian sea CAREDDU, GIULIO CALIZZA, EDOARDO COSTANTINI, Maria Letizia ROSSI, Loreto Isotopic determination of the trophic ecology of a ubiquitous key species. The crab Liocarcinus depurator (Brachyura: Portunidae) |
topic_facet |
coastal water food web trophic relationship detritus feeder stable isotope Tyrrhenian sea |
description |
Knowledge of the trophic ecology of predators is key to understanding how they affect food web structure and ecosystem functioning. The harbour crab Liocarcinus depurator (L.) (Brachyura: Portunidae) is one of the most abundant decapod species in soft-bottom areas of the Mediterranean Sea and northeast Atlantic Ocean. It is both a common prey and predator of commercial and non-commercial marine species and its predation pressure appears to have little effect on the subtidal community assemblage. However, there are few studies of its diet and little is known about its role in mediating energy flows in marine ecosystems. In this study, carbon (d13C) and nitrogen (d15N) stable isotope analysis (SIA) and Bayesian analytical tools were used to characterise the trophic niche of L. depurator and to quantify the most important prey supporting this species under various environmental conditions. Specimens of L. depurator, their potential prey and basal resources were collected from two different subtidal areas of the Gulf of Gaeta, one affected by human activities (north side) and the other seasonally influenced by freshwater inputs originating from the River Garigliano (south side). While there were differences between the two sampling areas in terms of the abundance and d15N and d13C values of the macrobenthic prey community, no differences in the d15N values and trophic position of L. depurator were observed. Specifically, Bayesian mixing models showed Polychaeta Errantia as the main source of crab diets in both areas. The observed differences in the d13C values and the analysis of trophic pathways also indicate that the terrestrial organic matter originating from the discharge of the River Garigliano was integrated along the food web up to L. depurator. Although this species is usually considered an opportunistic feeder, it appears to be highly selective and its trophic habits did not influence food web topology, which in contrast was found to be strongly influenced by River Garigliano discharge. |
author2 |
Careddu, Giulio Calizza, Edoardo Costantini, Maria Letizia Rossi, Loreto |
format |
Article in Journal/Newspaper |
author |
CAREDDU, GIULIO CALIZZA, EDOARDO COSTANTINI, Maria Letizia ROSSI, Loreto |
author_facet |
CAREDDU, GIULIO CALIZZA, EDOARDO COSTANTINI, Maria Letizia ROSSI, Loreto |
author_sort |
CAREDDU, GIULIO |
title |
Isotopic determination of the trophic ecology of a ubiquitous key species. The crab Liocarcinus depurator (Brachyura: Portunidae) |
title_short |
Isotopic determination of the trophic ecology of a ubiquitous key species. The crab Liocarcinus depurator (Brachyura: Portunidae) |
title_full |
Isotopic determination of the trophic ecology of a ubiquitous key species. The crab Liocarcinus depurator (Brachyura: Portunidae) |
title_fullStr |
Isotopic determination of the trophic ecology of a ubiquitous key species. The crab Liocarcinus depurator (Brachyura: Portunidae) |
title_full_unstemmed |
Isotopic determination of the trophic ecology of a ubiquitous key species. The crab Liocarcinus depurator (Brachyura: Portunidae) |
title_sort |
isotopic determination of the trophic ecology of a ubiquitous key species. the crab liocarcinus depurator (brachyura: portunidae) |
publisher |
Elsevier Science |
publishDate |
2017 |
url |
http://hdl.handle.net/11573/954426 https://doi.org/10.1016/j.ecss.2017.04.013 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000402494100011 volume:191 firstpage:106 lastpage:114 numberofpages:9 journal:ESTUARINE, COASTAL AND SHELF SCIENCE http://hdl.handle.net/11573/954426 doi:10.1016/j.ecss.2017.04.013 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85018517919 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.ecss.2017.04.013 |
container_title |
Estuarine, Coastal and Shelf Science |
container_volume |
191 |
container_start_page |
106 |
op_container_end_page |
114 |
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1792051841917255680 |