Browsing by Autor "Thibault Datry"

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A global analysis of terrestrial plant litter dynamics in non-perennial waterways
(Nature Portfolio, 2018) Thibault Datry; Arnaud Foulquier; Roland Corti; Daniel von Schiller; Klement Tockner; Clara Mendoza‐Lera; Jean‐Christophe Clément; Mark O. Gessner; Marcos Moleón; Rachel Stubbington
Author Correction: A global analysis of terrestrial plant litter dynamics in non-perennial waterways
(Nature Portfolio, 2018) Thibault Datry; Arnaud Foulquier; Roland Corti; Daniel von Schiller; Klement Tockner; Clara Mendoza‐Lera; Jean‐Christophe Clément; Mark O. Gessner; Marcos Moleón; Rachel Stubbington
Context‐dependent resistance of freshwater invertebrate communities to drying
(Wiley, 2017) Thibault Datry; Ross Vander Vorste; Edgar Goïtia; Nabor Moya; Melina Campero; Fabiola Rodríguez; José Zubieta; Thierry Oberdorff
Abstract More freshwater ecosystems are drying in response to global change thereby posing serious threat to freshwater biota and functions. The production of desiccation‐resistant forms is an important adaptation that helps maintain biodiversity in temporary freshwaters by buffering communities from drying, but its potential to mitigate the negative effects of drying in freshwater ecosystems could vary greatly across regions and ecosystem types. We explored this context dependency by quantifying the potential contribution of desiccation‐resistance forms to invertebrate community recovery across levels of regional drying prevalence (defined as the occurrence of drying events in freshwaters in a given region) and ecosystem types (lentic, lotic) in temporary neotropical freshwaters. We first predicted that regional drying prevalence influences the selection of species with desiccation‐resistant forms from the regional species pools and thus increases the ability of communities to recover from drying. Second, we predicted lentic freshwaters harbor higher proportions of species with desiccation‐resistant forms compared to lotic, in response to contrasted hydrologic connectivity. To test these predictions, we used natural experiments to quantify the contribution of desiccation‐resistant forms to benthic invertebrate community recovery in nine intermittent streams and six geographically isolated temporary wetlands from three Bolivian regions differing in drying prevalence. The contribution of desiccation‐resistant forms to community recovery was highest where regional drying prevalence was high, suggesting the species pool was adapted to regional disturbance regimes. The contribution of desiccation‐resistant forms to community recovery was lower in streams than in wetlands, emphasizing the importance of hydrologic connectivity and associated recolonization processes from in‐stream refuges to recovery in lotic systems. In all regions, the majority of functional traits were present in desiccation‐resistant taxa indicating this adaptation may help maintain ecosystem functions by buffering communities from the loss of functional traits. Accounting for regional context and hydrologic connectivity in community recovery processes following drying can help refine predictions of freshwater biodiversity response to global change.
Determinants of local and regional communities in intermittent and perennial headwaters of the Bolivian Amazon
(Centre National de la Recherche Scientifique, 2016) Thibault Datry; Nabor Moya; J. Zubieta; Emili García‐Berthou
[Departement_IRSTEA]Eaux [TR1_IRSTEA]QUASARE
Determinants of local and regional communities in intermittent and perennial headwaters of the Bolivian Amazon
(Wiley, 2016) Thibault Datry; Nabor Moya; José Zubieta; Thierry Oberdorff
Summary The effect of drying events on aquatic biodiversity is still overlooked in wet Neotropical systems. Yet, the responses of local communities and metacommunities in these biodiversity hotspots may differ from what is reported in other areas. We addressed the effect of drying events on local and regional fish and macroinvertebrate communities in the headwaters of the Chipiriri River basin, in the wet Neotropical piedmont of Bolivia. According to current knowledge in intermittent rivers and ephemeral streams (IRES) ecology, we predicted that intermittent (INT) sites would harbour lower α‐diversity, but higher β‐diversity, than perennial (PER) sites, due to local, negative effect of drying combined with the existence of multiple recovery stages at the network scale. Although habitat variables were similar between INT and PER sites, local and regional diversity patterns differed. Local invertebrate communities were not different between site types as soon as 4–6 weeks after flow resumption. The proximity of colonist sources and frequent rainfall probably enhanced persistence through dry periods and high resilience. In contrast, fish communities were still poorer at INT than PER sites, indicating they were still in the process of recolonising upstream INT reaches. β‐diversity analyses confirmed that invertebrate and fish metacommunities were not at the same recovery stage because (i) β‐diversity of invertebrates was best explained by physical and environmental distances at both INT and PER sites, whereas that of fish was explained only by physical distances at INT sites; (ii) fish β‐diversity was higher at INT than at PER sites, but invertebrate β‐diversity was similar; and (iii) physical distances were correlated with the turnover component of invertebrate β‐diversity but with the nestedness component for fish. Exploring regional community patterns in IRES and across biota with different dispersal abilities and modes can advance metacommunity theory and improve our ability to predict local community composition in dynamic ecosystems.
Drying has limited effects on the composition of invertebrate communities across a river network of the arid Bolivian Andes
(European Organization for Nuclear Research, 2025) Nabor Moya; Mathis Messager; Beymar Fernandez Rodriquez; Florentino Saigua; Ariel Angel Cespedes Llave; N. Bonada; Thibault Datry
This dataset consists of an Excel file with two sheets. The first sheet contains environmental data and invertebrate abundance data, while the second sheet provides explanations for each column. Specifically, the environmental variables recorded in the first sheet are described in the second sheet. ‘N/A’ (not applicable) indicates missing information in environmental variables or metadata, which may vary depending on whether the data were not collected or were lost.
Metacommunity patterns across three Neotropical catchments with varying environmental harshness
(Wiley, 2016) Thibault Datry; Adriano S. Melo; Nabor Moya; José Zubieta; Evans De La Barra; Thierry Oberdorff
Summary Most metacommunity studies indicate that dispersal processes play a minor role compared with species sorting in explaining metacommunity organisation, in particular, in stream systems. However, the role of dispersal could vary with environmental harshness, as a result of frequent resetting of community succession by disturbances and the selection of generalist species from regional species pools. The importance of dispersal may also be mitigated by species dispersal ability. In this study, we explored how species sorting and dispersal shaped invertebrate and fish metacommunities across streams in three tropical headwater catchments in Bolivia with contrasting environmental harshness, including flow regime, altitude and climate conditions. We addressed the hypothesis that the relative roles of dispersal and species sorting vary with environmental harshness: we predicted that the role of species sorting would predominate in benign conditions, whereas that of dispersal would predominate under moderate environmental harshness, and that neither dispersal nor species sorting would be relevant to explain metacommunities under high environmental harshness. We also hypothesised that the role of dispersal would decrease with increasing species dispersal ability. Although there was little or no spatial autocorrelation of environmental distances (i.e. environmental differences) across the headwater catchments, community similarity correlated more strongly with environmental than spatial distances among headwater sites that had low environmental harshness, but the opposite pattern was observed among sites with moderate environmental harshness. Under high environmental harshness, neither environmental harshness nor spatial distances between sites explained community similarity. Under moderate environmental harshness, the correlation between community similarity and spatial distances was the strongest for moderate dispersers of both invertebrates and fish. Yet, in contrast to fish, strongly dispersing invertebrate taxa were spatial structured, suggesting that they were not able to reach all sites as predicted. Our results suggest the role of dispersal might be underestimated, notably in systems prone to environmental harshness. Better proxies for dispersal, along with the use of spatial distances to account for resistance to animal movements in river systems and that account for flow magnitude and directionality, slope, riparian vegetation, wind and streambed roughness, may promote a more realistic integration of dispersal processes in basic and applied metacommunity research.
Securing Biodiversity, Functional Integrity, and Ecosystem Services in Drying River Networks (DRYvER)
(Pensoft Publishers, 2021) Thibault Datry; Daniel C. Allen; Roger Argelich; José Barquín; Núria Bonada‬‬‬‬‬‬‬‬‬‬‬; Andrew J. Boulton; Flora Branger; Yongjiu Cai; Miguel Cañedo‐Argüelles; Núria Cid
River networks are among Earth’s most threatened hot-spots of biodiversity and provide key ecosystem services (e.g., supply drinking water and food, climate regulation) essential to sustaining human well-being. Climate change and increased human water use are causing more rivers and streams to dry, with devastating impacts on biodiversity and ecosystem services. Currently, more than a half of the global river networks consist of drying channels, and these are expanding dramatically. However, drying river networks (DRNs) have received little attention from scientists and policy makers, and the public is unaware of their importance. Consequently, there is no effective integrated biodiversity conservation or ecosystem management strategy of DRNs. A multidisciplinary team of 25 experts from 11 countries in Europe, South America, China and the USA will build on EU efforts to assess the cascading effects of climate change on biodiversity, ecosystem functions and ecosystem services of DRNs through changes in flow regimes and water use. DRYvER (DRYing riVER networks) will gather and upscale empirical and modelling data from nine focal DRNs (case studies) in Europe (EU) and Community of Latin American and Caribbean States (CELAC) to develop a meta-system framework applicable to Europe and worldwide. It will also generate crucial knowledge-based strategies, tools and guidelines for economically-efficient adaptive management of DRNs. Working closely with stakeholders and end-users, DRYvER will co-develop strategies to mitigate and adapt to climate change impacts in DRNs, integrating hydrological, ecological (including nature-based solutions), socio-economic and policy perspectives. The end results of DRYvER will contribute to reaching the objectives of the Paris Agreement and placing Europe at the forefront of research on climate change.
Unravelling large-scale patterns and drivers of biodiversity in dry rivers
(2023) Arnaud Foulquier; Thibault Datry; Roland Corti; Daniel von Schiller; Klement Tockner; Rachel Stubbington; Mark O. Gessner; Frédéric Boyer; Marc Ohlmann; Wilfried Thuiller
<title>Abstract</title> The lack of data from non-perennial rivers, which regularly cease to flow and dry up, poses a significant challenge in understanding river biodiversity. These dynamic ecosystems, accounting for over half of the global river network, remain understudied. To address this gap, we conducted a coordinated experiment and a metabarcoding approach on environmental DNA targeting multiple taxa (i.e. Archaea, Bacteria, Fungi, Algae, Protozoa, Nematoda, Arthropoda and Streptophyta). Dry sediments were collected from 84 non-perennial rivers across 19 countries on five continents to investigate biodiversity patterns and drivers. Our findings reveal that both direct (e.g., nutrient and carbon availability) and indirect (e.g., latitude and climate) drivers significantly influence local biodiversity for most taxa. In particular, we observed that low resource availability and extended dry phases promote the prevalence of oligotrophic microbial taxa, similar to soil microbial communities during drought events. Interestingly, our inferred partial correlation networks indicate that covariation among taxa, particularly Bacteria, Fungi, Algae, and Protozoa, plays a more substantial role in explaining variations in community composition than abiotic gradients. This unexpected result suggests that biotic interactions may drive community assembly in non-perennial rivers, potentially shaping biodiversity responses in the face of global changes like warming and altered hydrological patterns.
Unravelling large-scale patterns and drivers of biodiversity in dry rivers
(Nature Portfolio, 2024) Arnaud Foulquier; Thibault Datry; Roland Corti; Daniel von Schiller; Klement Tockner; Rachel Stubbington; Mark O. Gessner; Frédéric Boyer; Marc Ohlmann; Wilfried Thuiller