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Sporta Caputi S, Kabala JP, Rossi L, Careddu G, Calizza E, Ventura M, Costantini ML. Individual diet variability shapes the architecture of Antarctic benthic food webs. Sci Rep 2024; 14:12333. [PMID: 38811641 PMCID: PMC11137039 DOI: 10.1038/s41598-024-62644-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 05/20/2024] [Indexed: 05/31/2024] Open
Abstract
Antarctic biodiversity is affected by seasonal sea-ice dynamics driving basal resource availability. To (1) determine the role of intraspecific dietary variability in structuring benthic food webs sustaining Antarctic biodiversity, and (2) understand how food webs and the position of topologically central species vary with sea-ice cover, single benthic individuals' diets were studied by isotopic analysis before sea-ice breakup and afterwards. Isotopic trophospecies (or Isotopic Trophic Units) were investigated and food webs reconstructed using Bayesian Mixing Models. As nodes, these webs used either ITUs regardless of their taxonomic membership (ITU-webs) or ITUs assigned to species (population-webs). Both were compared to taxonomic-webs based on taxa and their mean isotopic values. Higher resource availability after sea-ice breakup led to simpler community structure, with lower connectance and linkage density. Intra-population diet variability and compartmentalisation were crucial in determining community structure, showing population-webs to be more complex, stable and robust to biodiversity loss than taxonomic-webs. The core web, representing the minimal community 'skeleton' that expands opportunistically while maintaining web stability with changing resource availability, was also identified. Central nodes included the sea-urchin Sterechinus neumayeri and the bivalve Adamussium colbecki, whose diet is described in unprecedented detail. The core web, compartmentalisation and topologically central nodes represent crucial factors underlying Antarctica's rich benthic food web persistence.
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Affiliation(s)
- Simona Sporta Caputi
- Department of Environmental Biology, Sapienza University of Rome, Via Dei Sardi 70, 00185, Rome, Italy
- CoNISMa, National Inter-University Consortium for Marine Sciences, Piazzale Flaminio 9, 00196, Rome, Italy
| | - Jerzy Piotr Kabala
- Department of Environmental Biology, Sapienza University of Rome, Via Dei Sardi 70, 00185, Rome, Italy
| | - Loreto Rossi
- CoNISMa, National Inter-University Consortium for Marine Sciences, Piazzale Flaminio 9, 00196, Rome, Italy.
| | - Giulio Careddu
- Department of Environmental Biology, Sapienza University of Rome, Via Dei Sardi 70, 00185, Rome, Italy
- CoNISMa, National Inter-University Consortium for Marine Sciences, Piazzale Flaminio 9, 00196, Rome, Italy
| | - Edoardo Calizza
- Department of Environmental Biology, Sapienza University of Rome, Via Dei Sardi 70, 00185, Rome, Italy
- CoNISMa, National Inter-University Consortium for Marine Sciences, Piazzale Flaminio 9, 00196, Rome, Italy
| | - Matteo Ventura
- Department of Environmental Biology, Sapienza University of Rome, Via Dei Sardi 70, 00185, Rome, Italy
| | - Maria Letizia Costantini
- Department of Environmental Biology, Sapienza University of Rome, Via Dei Sardi 70, 00185, Rome, Italy
- CoNISMa, National Inter-University Consortium for Marine Sciences, Piazzale Flaminio 9, 00196, Rome, Italy
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Xie B, Du J, Zheng X, Chen B. Marine food webs, ecosystem models and stable isotopes. REFERENCE MODULE IN EARTH SYSTEMS AND ENVIRONMENTAL SCIENCES 2023. [DOI: 10.1016/b978-0-323-90798-9.00027-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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Bertucci A, Hoede C, Dassié E, Gourves PY, Suin A, Le Menach K, Budzinski H, Daverat F. Impact of environmental micropollutants and diet composition on the gut microbiota of wild european eels (Anguilla anguilla). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 314:120207. [PMID: 36165828 DOI: 10.1016/j.envpol.2022.120207] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 08/22/2022] [Accepted: 09/15/2022] [Indexed: 06/16/2023]
Abstract
In fish, the gut microbiome plays a crucial role in homeostasis and health and is affected by several organic and inorganic environmental contaminants. Amphidromous fish are sentinel species, particularly exposed to these stressors. We used whole metagenome sequencing to characterize the gut microbiome of wild European eels (Anguilla anguilla) at a juvenile stage captured from three sites with contrasted pollution levels in term of heavy metals and persistent organic pollutants. The objectives were to identify what parameters could alter the gut microbiome of this catadromous fish and to explore the potential use of microbiota as bioindicators of environment quality. We identified a total of 1079 microbial genera. Overall, gut microbiome was dominated by Proteobacteria, Firmicutes and Actinobacteria. Alpha and beta diversity were different amongst sites and could be explained by a reduced number of environmental and biological factors, specifically the relative abundance of fish preys in eels' diet, PCB101, γHCH (lindane), transnonachlor and arsenic. Furthermore, we identified a series of indicator taxa with differential abundance between the three sites. Changes in the microbial communities in the gut caused by environmental pollutants were previously undocumented in European eels. Our results indicate that microbiota might represent another route by which pollutants affect the health of these aquatic sentinel organisms.
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Affiliation(s)
| | - Claire Hoede
- Université de Toulouse, INRAE, UR MIAT, PF GenoToul Bioinfo, 31320, Castanet-Tolosan, France; Université Fédérale de Toulouse, INRAE, BioinfOmics, GenoToul Bioinformatics Facility, 31326, Castanet-Tolosan, France
| | - Emilie Dassié
- Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, 33600, Pessac, France
| | | | - Amandine Suin
- Genome & Transcriptome - Plateforme GeT-PlaGe, INRAE, 31326, Castanet-Tolosan, France
| | - Karine Le Menach
- Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, 33600, Pessac, France
| | - Hélène Budzinski
- Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, 33600, Pessac, France
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Zheng X, Como S, Huang L, Magni P. Temporal changes of a food web structure driven by different primary producers in a subtropical eutrophic lagoon. MARINE ENVIRONMENTAL RESEARCH 2020; 161:105128. [PMID: 32916642 DOI: 10.1016/j.marenvres.2020.105128] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 08/19/2020] [Accepted: 08/22/2020] [Indexed: 06/11/2023]
Abstract
Coastal lagoons are often characterized by eutrophic conditions which are known to impair the structure and functioning of both pelagic and benthic compartments. However, the manner in which eutrophication triggers a series of cascade effects in the whole food web in coastal lagoons has received little attention. Using stable isotope (SI) analyses, we investigated the food web structure in the hypertrophic lagoon of Yundang (Xiamen, China) in two periods of the year characterized by the recurrent alternation of Ulva lactuca and phytoplankton blooms in the cool (March) and warm (September) seasons, respectively. Large temporal fluctuations in the dominance of primary producers (i.e. macroalgae vs. phytoplankton) and, thus, in the available food items, were reflected in major changes in the diet and SI signals of several primary consumers, such as the amphipod Grandidierella japonica, the polychaetes Neanthes japonica and Capitella capitata, and omnivorous fishes (i.e. Mugil cephalus, Oreochromis niloticus, and Sardinella zunasi), while these changes were limited in top carnivorous fishes, such as Lateolabrax japonicus. Furthermore, reduced macrozoobenthic abundance available for omnivores in September was found to force omnivores to switch their feeding habits to those of herbivores. The present study provides evidence that the periodical alternation of macroalgal and phytoplankton blooms throughout the year strongly affect the relations among different trophic levels leading to a cascading effect across the whole food web and to major changes in the lagoon's food web structure. Importantly, our study shows that the lagoon's food web structure under persistent eutrophic conditions can still cope with seasonal changes in primary energy source type from macroalgae to microalgae due to the ability of omnivorous fishes to conduit different food sources up to the highest trophic levels. Thus, this study suggests that in such a highly variable eutrophic system, omnivores play a central role in the lagoon's functioning, and help to sustain the biological resources and the ecosystem services provided by the lagoon.
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Affiliation(s)
- Xinqing Zheng
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, Fujian Province, 361005, PR China
| | - Serena Como
- National Research Council of Italy, Institute of Biophysics (CNR-IBF), 56124, Pisa, Italy
| | - Lingfeng Huang
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, 361102, China.
| | - Paolo Magni
- National Research Council of Italy, Institute for the Study of Anthropogenic Impact and Sustainability in Marine Environment (CNR-IAS), Loc. Sa Mardini, Torregrande, 09170, Oristano, Italy; Foundation International Marine Centre (IMC), Loc. Sa Mardini, Torregrande, 09170, Oristano, Italy.
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