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  1. Article ; Online: Deforestation strengthens environmental filtering and competitive exclusion in Neotropical streams and rivers.

    Cantera, Isabel / Jézéquel, Céline / Dejean, Tony / Murienne, Jérôme / Vigouroux, Régis / Valentini, Alice / Brosse, Sébastien

    Proceedings. Biological sciences

    2023  Volume 290, Issue 2006, Page(s) 20231130

    Abstract: Understanding how anthropization impacts the assembly of species onto communities is pivotal to go beyond the observation of biodiversity changes and reveal how disturbances affect the environmental and biotic processes shaping biodiversity. Here, we ... ...

    Abstract Understanding how anthropization impacts the assembly of species onto communities is pivotal to go beyond the observation of biodiversity changes and reveal how disturbances affect the environmental and biotic processes shaping biodiversity. Here, we propose a simple framework to measure the assembly processes underpinning functional convergence/divergence patterns. We applied this framework to northern Amazonian fish communities inventoried using environmental DNA in 35 stream sites and 64 river sites. We found that the harsh and unstable environmental conditions characterizing streams conveyed communities towards functional convergence, by filtering traits related to food acquisition and, to a lower extent, dispersal. Such environmental filtering also strengthened competition by excluding species having less competitive food acquisition traits. Instead, random species assembly was more marked in river communities, which may be explained by the downstream position of rivers facilitating the dispersion of species. Although fish assembly rules differed between streams and river fish communities, anthropogenic disturbances reduced functional divergence in both ecosystems, with a reinforcement of both environmental filtering and weaker competitor exclusion. This may explain the substantial biodiversity alterations observed under slight deforestation levels in Neotropical freshwater ecosystems and underlines their vulnerability to anthropic disturbances that not only affect species persistence but also modify community assembly rules.
    MeSH term(s) Animals ; Conservation of Natural Resources ; Ecosystem ; Rivers ; Fresh Water ; Anthropogenic Effects
    Language English
    Publishing date 2023-09-13
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209242-6
    ISSN 1471-2954 ; 0080-4649 ; 0962-8452 ; 0950-1193
    ISSN (online) 1471-2954
    ISSN 0080-4649 ; 0962-8452 ; 0950-1193
    DOI 10.1098/rspb.2023.1130
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Accessibility and appeal jointly bias the inventory of Neotropical freshwater fish fauna

    Herrera-R, Guido A. / Tedesco, Pablo A. / DoNascimiento, Carlos / Jézéquel, Céline / Giam, Xingli

    Biological Conservation. 2023 Aug., v. 284 p.110186-

    2023  

    Abstract: Inventorying biodiversity is fundamental to overcoming knowledge shortfalls in species discovery and description (Linnean shortfall), their distributions (Wallacean shortfall) and abiotic niches (Hutchinsonian shortfall). However, inventorying efforts ... ...

    Abstract Inventorying biodiversity is fundamental to overcoming knowledge shortfalls in species discovery and description (Linnean shortfall), their distributions (Wallacean shortfall) and abiotic niches (Hutchinsonian shortfall). However, inventorying efforts often show spatial biases, and the underlying causes have only been explored at large spatial extents for the most well-known terrestrial taxa. Improving our understanding of these biases and their drivers is particularly crucial in the speciose tropics, where biodiversity knowledge suffers the most from knowledge shortfalls. Using the most complete information available on freshwater fish distributions in three regions in the Neotropics (Orinoco and Trans-Andeans, the Amazon and the La Plata basins), first, we evaluated environmental biases in inventory effort and completeness across sub-basins. Further, we examined three hypotheses (Accessibility, Appeal, and Safety) to explain the differences in contemporary (2000–2018) inventorying efforts. The Accessibility and Appeal hypotheses were well-supported and conjointly explained a moderate proportion of the spatial variation in the inventorying effort. By contrast, the Safety hypothesis predictors showed limited support. The most accessible sub-basins (i.e., lower travel time from cities or closer to fluvial ports) experienced higher inventorying effort regarding the number of unique inventorying locations and years inventoried. Our results suggest that differences in Accessibility alone may be insufficient to explain inventorying biases. Inventorying efforts were also biased against sub-basins with lower biodiversity and habitat diversity, showing preferential sampling driven by sub-basins' Appeal. The imprint driven by Appeal elucidates opportunities to coordinate future efforts to fill the shortfalls of biodiversity knowledge more efficiently for the Neotropical fish fauna.
    Keywords Neotropics ; biodiversity ; fauna ; freshwater fish ; habitats ; inventories ; tropical fish ; Biodiversity knowledge shortfalls ; Amazon ; Colombia ; La Plata ; Inventory completeness ; Inventory effort ; Sampling
    Language English
    Dates of publication 2023-08
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ISSN 0006-3207
    DOI 10.1016/j.biocon.2023.110186
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Environmental DNA reveals a mismatch between diversity facets of Amazonian fishes in response to contrasting geographical, environmental and anthropogenic effects

    Coutant, Opale / Jézéquel, Céline / Mokany, Karel / Cantera, Isabel / Covain, Raphaël / Valentini, Alice / Dejean, Tony / Brosse, Sébastien / Murienne, Jérôme

    Global Change Biology. 2023 Apr., v. 29, no. 7 p.1741-1758

    2023  

    Abstract: Freshwater ecosystems are among the most endangered ecosystem in the world. Understanding how human activities affect these ecosystems requires disentangling and quantifying the contribution of the factors driving community assembly. While it has been ... ...

    Abstract Freshwater ecosystems are among the most endangered ecosystem in the world. Understanding how human activities affect these ecosystems requires disentangling and quantifying the contribution of the factors driving community assembly. While it has been largely studied in temperate freshwaters, tropical ecosystems remain challenging to study due to the high species richness and the lack of knowledge on species distribution. Here, the use of eDNA‐based fish inventories combined to a community‐level modelling approach allowed depicting of assembly rules and quantifying the relative contribution of geographic, environmental and anthropic factors to fish assembly. We then used the model predictions to map spatial biodiversity and assess the representativity of sites surveyed in French Guiana within the EU Water Framework Directive (WFD) and highlighted areas that should host unique freshwater fish assemblages. We demonstrated a mismatch between the taxonomic and functional diversity. Taxonomic assemblages between but also within basins were mainly the results of dispersal limitation resulting from basin isolation and natural river barriers. Contrastingly, functional assemblages were ruled by environmental and anthropic factors. The regional mapping of fish diversity indicated that the sites surveyed within the EU WFD had a better representativity of the regional functional diversity than taxonomic diversity. Importantly, we also showed that the assemblages expected to be the most altered by anthropic factors were the most poorly represented in terms of functional diversity in the surveyed sites. The predictions of unique functional and taxonomic assemblages could, therefore, guide the establishment of new survey sites to increase fish diversity representativity and improve this monitoring program.
    Keywords basins ; endangered ecosystems ; environmental DNA ; freshwater ; freshwater fish ; functional diversity ; geographical distribution ; global change ; humans ; rivers ; species richness ; surveys ; French Guiana
    Language English
    Dates of publication 2023-04
    Size p. 1741-1758.
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 1281439-8
    ISSN 1365-2486 ; 1354-1013
    ISSN (online) 1365-2486
    ISSN 1354-1013
    DOI 10.1111/gcb.16533
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  4. Article: Geomorphological diversity of rivers in the Amazon Basin

    Jézéquel, Céline / Oberdorff, Thierry / Tedesco, Pablo A. / Schmitt, Laurent

    Geomorphology. 2022 Mar. 01, v. 400

    2022  

    Abstract: The regional extent and transboundary nature of the world largest rivers accentuate the difficulty to characterize river forms and processes at a whole basin scale. We developed a framework to define a river classification protocol adapted to large ... ...

    Abstract The regional extent and transboundary nature of the world largest rivers accentuate the difficulty to characterize river forms and processes at a whole basin scale. We developed a framework to define a river classification protocol adapted to large rivers and further applied this protocol to elaborate a geomorphological classification of Amazonian rivers using two interlocked hierarchical spatial scales: the landscape unit at the basin scale and the reach unit at the local scale. Our framework relies on open-source geospatial data, reproducible and automatic methods to extract the geomorphological attributes of the river network, and on statistical modelling. We followed five main steps to develop our geomorphological classification of Amazonian rivers: (1) the identification of the basin landscape units (LUs) using a set of physical, topographic, and climatic variables; (2) the delineation of the active channel and floodplain surfaces along the river basin longitudinal continuum using satellite image-based data; (3) the sub-division of the entire river network into elementary river reach units displaying uniform conditions; (4) the selection, at the reach scale, of a set of geomorphic variables adapted to large rivers; (5) the elaboration of the Amazonian rivers classification by statistically grouping the reach units into ‘homogenous’ river types. Finally, we described the spatial patterns of river types within the basin, and illustrate the multi-scale flexibility and robustness of the approach focusing on the multi-threaded Negro River, a main tributary of the Amazon mainstem.
    Keywords basins ; floodplains ; landscapes ; rivers ; satellites ; spatial data ; topography ; watersheds
    Language English
    Dates of publication 2022-0301
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 58028-4
    ISSN 0169-555X
    ISSN 0169-555X
    DOI 10.1016/j.geomorph.2021.108078
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: Major shifts in biogeographic regions of freshwater fishes as evidence of the Anthropocene epoch.

    Leroy, Boris / Bellard, Céline / Dias, Murilo S / Hugueny, Bernard / Jézéquel, Céline / Leprieur, Fabien / Oberdorff, Thierry / Robuchon, Marine / Tedesco, Pablo A

    Science advances

    2023  Volume 9, Issue 46, Page(s) eadi5502

    Abstract: Animals and plants worldwide are structured in global biogeographic regions, which were shaped by major geologic forces during Earth history. Recently, humans have changed the course of events by multiplying global pathways of introduction for ... ...

    Abstract Animals and plants worldwide are structured in global biogeographic regions, which were shaped by major geologic forces during Earth history. Recently, humans have changed the course of events by multiplying global pathways of introduction for nonindigenous species and propagating local species extirpations. Here, we report on how introductions and extirpations have changed the distributions of freshwater fishes worldwide and how it affected their natural biogeographic regions. We found major shifts in natural regions, with the emergence of an intercontinental region arising from the fusion of multiple faunas, which we named Pan-Anthropocenian Global North and East Asia (PAGNEA). The PAGNEA region is evocative of the Pangea supercontinent, as flows of introductions show that dispersal has become possible again across multiple continents, suggesting that human activities have superseded natural geological forces. Our results constitute evidence on the expected modification of biostratigraphic boundaries based on freshwater fish, which are abundant in the fossil record, thereby supporting the concept of the Anthropocene epoch.
    MeSH term(s) Animals ; Humans ; Fresh Water ; Fishes ; Asia, Eastern ; Fossils ; Geology ; Phylogeny
    Language English
    Publishing date 2023-11-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.adi5502
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Évaluation des effets de l'augmentation des débits réservés à l'aval de deux barrages du Haut-Rhône français à l'aide de l'examen des communautés d'oligochètes

    Vivien, Régis / Jézéquel, Céline / Lafont, Michel

    Bulletin de la Société Vaudoise des Sciences Naturelles ; 128552-x ; 0037-9603 ; 100 ; 2021 ; 103

    2021  

    Publisher Société Vaudoise des Sciences Naturelles
    Publishing country ch
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article: Correlations between broad‐scale taxonomic and genetic differentiations suggest a dominant imprint of historical processes on beta diversities

    Robuchon, Marine / Leroy, Boris / Jézéquel, Céline / Hugueny, Bernard

    Journal of biogeography. 2019 May, v. 46, no. 5

    2019  

    Abstract: AIM: Dispersal limitation, environmental selection and drift are known to influence both taxonomic similarity between communities and genetic similarity between populations. However, disentangling the relative roles of these processes on spatial patterns ...

    Abstract AIM: Dispersal limitation, environmental selection and drift are known to influence both taxonomic similarity between communities and genetic similarity between populations. However, disentangling the relative roles of these processes on spatial patterns of differentiation—whether regarding taxonomic differentiation (TD) between communities or genetic differentiation (GD) between populations—is challenging. Investigating whether spatial patterns of TD and GD are correlated (β‐SGDCs) is a promising approach to address this issue. Here, we investigated β‐SGDCs over broad spatial scales and 22 freshwater fish species to elucidate the processes shaping TD and GD between drainage basins. LOCATION: Global scope, data mainly from Europe and North America. TAXON: Actinopterygii and Petromyzontiformes (freshwater fishes). METHODS: We used Mantel tests to investigate the raw correlation between TD and GD. We carried out multiple regressions to characterize the effects of geographic distance (proxy of dispersal limitation), environmental distance (proxy of environmental selection) and pairwise harmonic mean area between basins (proxy of drift) on TD and GD taken separately. We then analyzed the correlation between the residuals of these two regressions with Mantel tests. Finally, we investigated whether the variation in β‐SGDC between species was related to species traits. RESULTS: We detected an overall positive β‐SGDC, both for the raw and the residual correlations. This implies that, unmeasured effects, other than geographic distance, environmental distance and harmonic mean area, influence the β‐SGDC observed. Values of β‐SGDCs greatly varied between species, but this was not explained by any species traits. MAIN CONCLUSIONS: Independently of the effects of geographic distance, environmental distance and harmonic mean area, the β‐SGDC we observed suggests that historical processes strongly shaped the patterns of TD and GD between basins. Consequently, TD may be an appropriate proxy to explain the influence of historical processes on GD.
    Keywords Actinopterygii ; Petromyzontiformes ; basins ; freshwater fish ; genetic similarity ; genetic variation ; regression analysis ; species diversity ; watersheds ; Europe ; North America
    Language English
    Dates of publication 2019-05
    Size p. 1083-1095.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 188963-1
    ISSN 0305-0270
    ISSN 0305-0270
    DOI 10.1111/jbi.13559
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  8. Article: The global geography of fish diadromy modes

    Chalant, Anaïs / Hugueny, Bernard / Jézéquel, Céline / Keith, Philippe

    Global ecology and biogeography. 2019 Sept., v. 28, no. 9

    2019  

    Abstract: AIM: Geographical gradients in resource production are likely to translate into macroecological patterns in the biodiversity of migratory organisms, but few studies have addressed this question at a global scale. Here, we tested a hypothesis based on ... ...

    Abstract AIM: Geographical gradients in resource production are likely to translate into macroecological patterns in the biodiversity of migratory organisms, but few studies have addressed this question at a global scale. Here, we tested a hypothesis based on uncoupled latitudinal gradients in marine and freshwater primary productivities aimed at explaining where (e.g., at which latitude) and at which stage of the life cycle (larvae, amphidromy; juvenile, catadromy; or adult, anadromy) migration from ocean to freshwater occurs (diadromy). LOCATION: Global. TIME PERIOD: Current. MAJOR TAXA STUDIED: Fishes. METHODS: We modelled, using multinomial regressions, the proportion of catadromous, anadromous and amphidromous species in 994 river basins as a function of freshwater and marine net primary productivities (NPP; in milligrams of carbon per square metre per day) and additional biotic and abiotic variables. Using data extracted from the Global Biodiversity Information Facility (GBIF) database, we tested whether diadromous, catadromous and amphidromous species differed with respect to the NPP of their marine and freshwater occurrences. RESULTS: Among diadromous species, anadromous species are present in higher proportions when conditions for growth are more favourable in the sea (higher productivity, higher temperature and lower number of competitors) than in freshwaters. The model reconstructs the latitudinal pattern observed in the proportion of anadromous species, including an asymmetry between the Northern and Southern Hemispheres. According to GBIF occurrences, the ratio of marine over freshwater productivity is higher for anadromous species compared with catadromous and amphidromous species. MAIN CONCLUSIONS: Our results support the hypothesis stating that migration between ocean and freshwater occurs by choosing the biome that optimizes pre‐reproductive growth and is one more example of the importance of primary productivity in shaping large‐scale community patterns. This result suggests that some diadromous fish populations and species may suffer from anticipated climate change if interbiome productivity gradients are affected.
    Keywords adults ; anadromous fish ; asymmetry ; biodiversity ; carbon ; catadromous fish ; climate change ; databases ; ecosystems ; fish communities ; freshwater ; juveniles ; larvae ; latitude ; migratory behavior ; models ; primary productivity ; temperature ; watersheds
    Language English
    Dates of publication 2019-09
    Size p. 1272-1282.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 2021283-5
    ISSN 1466-8238 ; 1466-822X ; 0960-7447
    ISSN (online) 1466-8238
    ISSN 1466-822X ; 0960-7447
    DOI 10.1111/geb.12931
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  9. Article ; Online: Modelling built infrastructure heights to evaluate common assumptions in aquatic conservation.

    Januchowski-Hartley, Stephanie R / Jézéquel, Céline / Tedesco, Pablo A

    Journal of environmental management

    2018  Volume 232, Page(s) 131–137

    Abstract: Built infrastructure, such as dams and weirs, are some of the most impactful stressors affecting aquatic ecosystems. However, data on the distribution and characteristics of small built infrastructure that often restrict fish movement, impede flows, and ... ...

    Abstract Built infrastructure, such as dams and weirs, are some of the most impactful stressors affecting aquatic ecosystems. However, data on the distribution and characteristics of small built infrastructure that often restrict fish movement, impede flows, and retain sediments and materials, remain limited. Collection of this necessary information is challenged by the large number of built infrastructure with unknown dimensions (e.g., height), which means scientists and practitioners need to make assumptions about these characteristics in research and decision-making. Evaluating these common assumptions is essential for advancing conservation that is more effective. We use a statistical modelling approach to double the number of small (≤5 m high) built infrastructure with height values in France. Using two scenarios depicting common assumptions (all infrastructure without height data are impassable, or all are passable for all species) and one based on our modelled heights, we demonstrate how assumptions can influence our understanding of river fragmentation. Assuming all built infrastructure without height data are passable results in a 5-fold reduction in estimated river fragmentation for fish species that cannot pass built infrastructure ≥1.0 m. The opposite is true for fish species that cannot pass ≥2.0 m, where assuming all built infrastructure without height data are impassable results in a 7-fold increase in fragmentation compared to the scenario with modelled heights to attribute built infrastructure passability. Our findings suggest that modelled height data leads to better understanding of river fragmentation, and that knowledge of different fish species' abilities to pass a variety of built infrastructure is essential to guide more effective management strategies. Our modelling approach, and results, are of particular relevance to regions where efforts to both remediate and remove built infrastructure is occurring, but where gaps in data on characteristics of built infrastructure remain, and limit effective decision making.
    MeSH term(s) Animals ; Conservation of Natural Resources ; Ecosystem ; Fishes ; France ; Rivers
    Language English
    Publishing date 2018-11-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2018.11.040
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Environmental DNA reveals a mismatch between diversity facets of Amazonian fishes in response to contrasting geographical, environmental and anthropogenic effects.

    Coutant, Opale / Jézéquel, Céline / Mokany, Karel / Cantera, Isabel / Covain, Raphaël / Valentini, Alice / Dejean, Tony / Brosse, Sébastien / Murienne, Jérôme

    Global change biology

    2022  Volume 29, Issue 7, Page(s) 1741–1758

    Abstract: Freshwater ecosystems are among the most endangered ecosystem in the world. Understanding how human activities affect these ecosystems requires disentangling and quantifying the contribution of the factors driving community assembly. While it has been ... ...

    Abstract Freshwater ecosystems are among the most endangered ecosystem in the world. Understanding how human activities affect these ecosystems requires disentangling and quantifying the contribution of the factors driving community assembly. While it has been largely studied in temperate freshwaters, tropical ecosystems remain challenging to study due to the high species richness and the lack of knowledge on species distribution. Here, the use of eDNA-based fish inventories combined to a community-level modelling approach allowed depicting of assembly rules and quantifying the relative contribution of geographic, environmental and anthropic factors to fish assembly. We then used the model predictions to map spatial biodiversity and assess the representativity of sites surveyed in French Guiana within the EU Water Framework Directive (WFD) and highlighted areas that should host unique freshwater fish assemblages. We demonstrated a mismatch between the taxonomic and functional diversity. Taxonomic assemblages between but also within basins were mainly the results of dispersal limitation resulting from basin isolation and natural river barriers. Contrastingly, functional assemblages were ruled by environmental and anthropic factors. The regional mapping of fish diversity indicated that the sites surveyed within the EU WFD had a better representativity of the regional functional diversity than taxonomic diversity. Importantly, we also showed that the assemblages expected to be the most altered by anthropic factors were the most poorly represented in terms of functional diversity in the surveyed sites. The predictions of unique functional and taxonomic assemblages could, therefore, guide the establishment of new survey sites to increase fish diversity representativity and improve this monitoring program.
    MeSH term(s) Animals ; Humans ; Ecosystem ; DNA, Environmental ; Anthropogenic Effects ; Biodiversity ; Fishes/physiology ; Environmental Monitoring
    Chemical Substances DNA, Environmental
    Language English
    Publishing date 2022-11-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 1281439-8
    ISSN 1365-2486 ; 1354-1013
    ISSN (online) 1365-2486
    ISSN 1354-1013
    DOI 10.1111/gcb.16533
    Database MEDical Literature Analysis and Retrieval System OnLINE

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