Characterizing Space‐Time Channel Network Dynamics in a Mediterranean Intermittent Catchment of Central Italy Combining Visual Surveys and Cameras

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(1)

Published: Jan. 1, 2024

Abstract Non‐perennial streams have a global prevalence, but quantitative knowledge of the temporal dynamics their flowing length—namely extent wet portion stream network—remains limited, as monitoring spatiotemporal configuration channels is challenging in most settings. This work combines high spatial resolution visual surveys and camera‐based approaches to reconstruct space‐time network 3.7 km 2 Mediterranean catchment central Italy. Information on hydrological status derived from 40 field sub‐hourly images collected with 21 stage‐cameras are combined exploiting hierarchical principle. The latter postulates existence Bayesian chain, defined local persistence nodes that dictates wetting/drying order during expansion/retraction cycles network. Our results highlight complexity study area: while number decreases dry season increases season, persistency exhibits highly heterogeneous non‐monotonic pattern, originating dynamically disconnected Despite this heterogeneity, model well approximates evolution state nodes, an accuracy exceeds 99%. Crucially, allows reconstruction even cases which part was not observed. provides novel conceptual approach for poorly accessible sites.

Language: Английский

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Resistance not resilience traits structure macroinvertebrate communities in newly drying stream sections

Hydrobiologia, Journal Year: 2024, Volume and Issue: 851(15), P. 3577 - 3590

Published: April 15, 2024

Abstract Transitioning from perennial to non-perennial flow regimes causes ecological shifts in aquatic communities. Aquatic macroinvertebrates deploy resistance and resilience strategies cope with intermittency, crucial rivers long-term seasonal dry episodes. Less is known, about how these support community persistence streams that only recently have experienced drying, where local assemblages lack such adaptations. Our study conducted two four-season campaigns, separated by a one-year break, assess macroinvertebrate responses newly drying intermittent comparing stream sections. We characterize communities structural functional perspectives, then evaluate the response at trait state level. observed decline taxa richness abundance, but not diversity, intermittency. Resistance traits are more important than resilient structuring Taxa sections exhibit smaller space, indicating lower redundancy. The intermittency lacks predictable pattern, suggesting time-dependent trait-state-specific colonization adapted assembly strategies. As river drought increases due climate change, recognizing temporal dimension becomes for understanding

Language: Английский

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Natural Disturbances and Connectivity Drive Seasonal Taxonomic and Trait Patterns of Aquatic Macroinvertebrate Communities Across Europe

Global Ecology and Biogeography, Journal Year: 2025, Volume and Issue: 34(5)

Published: May 1, 2025

ABSTRACT Aim Understanding the joint influence of natural disturbance regime, connectivity and biogeography on seasonal variation community structure. Location Drying river networks (DRN) in Europe. Time Period Present. Major Taxa Studied Aquatic macroinvertebrates. Methods We analyse taxonomic trait structure 638 macroinvertebrate communities sampled across 125 reaches with perennial intermittent streamflow, surveyed six DRNs Europe, up to times over 1 year. Results Richness diversity decreased increasing drying frequency, but increased spatio‐temporal long events. Communities experiencing frequent events had higher relative abundance taxa a lifecycle resistance traits. compensated by high connectivity, more fecundity dispersal ability. richness peaked summer that pattern was prominent when frequency high. Trait throughout year, showing abiotic stress as year progressed. changed from mobile, fecund, short‐lived spring autumn long‐lived summer. However, increased, shifted towards taxa. Macroinvertebrate It opposed Mediterranean and/or upland (with fecund mobile taxa) lowland taxa). Main Conclusions Frequency duration drive divergent structures, suggesting presence an ecological threshold explains variability disturbed ecosystems broad spatial scales. These factors also variations, shaped distinct trait‐filtering processes based frequency. Ultimately, plays crucial role sustaining species intense drying.

Language: Английский

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Integrating spatiotemporal hydrological connectivity into conservation planning to protect temporary rivers

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2024, Volume and Issue: 34(3)

Published: March 1, 2024

Abstract Temporary rivers (TRs) have been largely overlooked in conservation assessments. Because TRs are such dynamic ecosystems, spatial and temporal aspects of their hydrology ecology need to be taken into account when designing plans. The aim this paper is propose a set recommendations that could useful for managers do this, using seasonal diatom macroinvertebrate data from north‐eastern Spain as case study. Beta diversity was partitioned local species contributions beta (LCBD SCBD). Additionally, priority sites covering the distribution all were identified Marxan selection frequency (MSF) served measure relative irreplaceability each site. Using both approaches (beta Marxan), effects changing spatiotemporal connectivity habitat heterogeneity on prioritization conserved assessed. It found LCBD MSF ranged widely space time. However, weakly related. adequately represented taxa by selecting few sites, while selected communities with higher differentiation but not necessarily those rare species. In addition, SCBDs assigned low values taxa, thus care must index planning. Spatiotemporal played critical role at regional scales, driving site prioritization. Overall, we recommend: 1) monitoring multiple hydrological phases encompass different community types capturing total diversity; 2) combination, benefit complementary insights; 3) integrating isolation plans, since they main drivers variation over time TRs.

Language: Английский

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Retos y oportunidades para la evaluación del estado ecológico en ríos temporales

Ecosistemas, Journal Year: 2024, Volume and Issue: unknown, P. 2655 - 2655

Published: March 9, 2024

Los ríos temporales (RTs) son ecosistemas fluviales en los que efectos de las perturbaciones antrópicas se mezclan con la propia perturbación natural impone temporalidad del flujo. A pesar avances el conocimiento RTs, todavía persisten muchas lagunas limitan desarrollo metodologías adecuadas para evaluación su estado ecológico. En esta revisión identificamos retos actuales correcta ecológico RTs y analizamos oportunidades existentes hacerles frente. Estos centran en: diferenciación entre naturales o hidrológicamente impactados, antrópicas, índices biológicos pozas desconectadas cauces secos, adaptación hidrogeomorfológicos, aplicación teoría metacomunidades RTs. Las están relacionadas con: uso nuevas herramientas moleculares, existencia alternativos a tradicionales, disponibilidad datos poder hacer modelización, implicación social hidrológico La centra mayoritariamente científico gestión acumulado desde implementación DMA España, pero recoge experiencias otros mundo guiar acciones conservación estos únicos altamente amenazados por cambio global.

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Evaluating the response of current biotic indices and functional metrics to natural and anthropogenic predictors in disconnected pools of temporary rivers

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 948, P. 174825 - 174825

Published: July 15, 2024

Temporary rivers, forming the majority of river networks worldwide, are key biodiversity hotspots. Despite their great value for maintaining and ecosystem functioning, they often neglected in biomonitoring programs due to several challenges, such as variable hydromorphology difficulty establishing reference conditions given dynamic nature, resulting highly communities. Disconnected pools form temporary rivers when flow ceases, providing refuge aquatic taxa. Given importance conservation, revising adapting biotic indices needed. Here, we evaluate performance current biological designed perennial (macroinvertebrates, diatoms) functional metrics (macroinvertebrates) assessing quality disconnected pools. We sampled 55 Catalonia, NE Spain, covering local (e.g., physico-chemical variables, water chemistry) regional human influence, hydrological variables at body level) natural anthropogenic gradients. Only a few macroinvertebrate family richness, EPT/EPT + OCH OCH) showed strong responses predictors were unaffected by both scales, making them suitable biomonitoring. Of newly adopted communities tested, only two (i.e., redundancy predators response diversity based on total community) responded strongly predictors. The rest varying interactive effect predictors, requiring calibration efforts. Models these explained <40 % variation, likely interplay colonization/extinction dynamics density-dependent trophic interactions governing community assemblages Although some existing could potentially be used monitor ecological status pools, call further development tools specifically habitats since will become more widespread with global change.

Language: Английский

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Natural disturbances and connectivity shape the seasonal variability of aquatic macroinvertebrate communities across Europe

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 10, 2024

Abstract Understanding the joint influence of natural disturbance, spatial connectivity and biogeography on biodiversity is essential to forecast its responses climate change. Macroinvertebrate communities in drying river networks constitute an ideal study system understand interplay these ecological processes. We analyze taxonomic functional structure macroinvertebrate sampled across 126 reaches with perennial intermittent streamflow, surveyed six (DRN) Europe, times over one year. Drying frequency decreased community richness diversity communities, whereas spatio-temporal increased reaches. Communities experiencing a high proportion taxa K-strategies resistance traits. long duration compensated by had more r-strategy dispersal ability. Perennial varied from taxa-poor r-strategists spring autumn taxa-rich K-strategists summer constant throughout When increased, showed similar pattern except when they shifted towards species-poor K-strategists. Functional then peaked summer. Community trait particular optimal traits changed biogeographical scales. It opposed mountainous DRN (with r-strategies ability) non-mountainous K-strategies). frequency, duration, drive divergent structures, suggesting presence threshold that explains variability disturbed ecosystems broad These factors also shaped seasonal variations, particularly after summer, influenced stochastic recolonization events autumn. Spatial-temporal proved crucial for maintaining subjected intense drying. Lastly, effectiveness was dependent environmental conditions networks.

Language: Английский

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Assessing stream biological integrity across gradients of flow permanence and hydrologic connectivity

Freshwater Science, Journal Year: 2024, Volume and Issue: unknown, P. 000 - 000

Published: Aug. 14, 2024

Language: Английский

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Fundamentals of Environmental Economics in the Caribbean: Policy Design and Applications with Case Studies for Guyana

Published: Jan. 1, 2024

Language: Английский

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