Ecological Indicators, Год журнала: 2019, Номер 101, С. 41 - 49
Опубликована: Янв. 9, 2019
Язык: Английский
BioScience, Год журнала: 2025, Номер 75(1), С. 68 - 91
Опубликована: Янв. 1, 2025
Abstract Connectivity—the flows and exchanges of organisms, materials, energy within among watersheds—is a central paradigm in ecosystem science. Changes those connections have consequences for functioning water quality downstream upstream. Therefore, connectivity is cornerstone federal protection under the United States Clean Water Act (CWA). In present article, we review science connectivity, explain history changes CWA jurisdiction defining waters States, discuss implications US policy, highlight key steps to align that policy with The Sackett v. EPA (2023) Supreme Court decision significantly reduced wetlands headwaters, disregarding their larger, protected waterbodies. To fulfill goals restore maintain chemical, physical, biological integrity U.S. waters, Congress must amend act, fully recognizing multidimensional aquatic ecosystems ultimately incorporating these into ecosystem-level policy.
Язык: Английский
Процитировано
1
Metabarcoding and Metagenomics, Год журнала: 2018, Номер 2
Опубликована: Авг. 22, 2018
The hyporheic zone, i.e. the ecotone between surface water and groundwater, is a rarely studied freshwater ecosystem. Hyporheic taxa are often meiofaunal (<1 mm) in size difficult to identify based on morphology. Metabarcoding approaches promising for study of these environments taxa, but it yet unclear if commonly applied metabarcoding primers replication strategies can be used. In this study, we took sediment cores from two near natural upstream (NNU) ecologically improved downstream (EID) sites Boye catchment (Emscher River, Germany), their communities. We evaluated usability used, highly degenerate COI primer pair (BF2/BR2) tested how sequencing three PCR replicates per sample removing MOTUs present only one out impacts inferred community composition. A total 22,514 were detected, which 263 identified as Metazoa. Our results highlight gaps reference databases potential problems using studying samples containing high number non-metazoan taxa. Alpha diversity was higher EID showed similarity when compared NNU sites. Beta analyses that detected site greatly increased samples. Sequencing rare seen good compromise retaining too many false-positives introducing false-negatives. conclude communities provide valuable first insights into ecosystems some application scenarios.
Язык: Английский
Процитировано
74
Limnology and Oceanography, Год журнала: 2019, Номер 65(3), С. 557 - 568
Опубликована: Сен. 30, 2019
Abstract More than one‐third of the world's rivers cease to flow and go dry on a periodic basis—so‐called intermittent rivers. The frequency duration intermittency in running waters are increasing due climate change water demands for human use. Intermittency effects stream biodiversity ecosystem functioning dramatic expected become increasingly prevalent alpine landscapes near future. This project used modified field sensors measure intermittency, temperature, origin (groundwater, precipitation, glacier) at high spatio‐temporal resolution throughout an fluvial network (Val Roseg, Switzerland). We continuously recorded presence 30 tributary streams validated sensor performance with field‐collected measures. Three different regimes were observed network, including periodically intermittent, seasonally permanently flowing streams. Twenty‐four (80% streams) dried least once during sampling period. Principal components analysis along generalized additive models showed low average temperature conductivity (groundwater‐fed) prone permanent flow, whereas higher (glacier‐fed) typically had flow. proved precise simultaneously measuring river network. Overall, this approach provides effective way develop eco‐hydrological that examine riverine networks.
Язык: Английский
Процитировано
62
Ecohydrology, Год журнала: 2019, Номер 12(8)
Опубликована: Сен. 14, 2019
Abstract In most cases, intermittent rivers and ephemeral streams (IRES) form the principal surface water bodies in Mediterranean regions people are heavily dependent on them. Strong reliance such results numerous pressures, complex relationships formed between their various natural anthropogenic components, which creates challenges to decision‐makers who require a better understanding of IRES establish effective measures restore ecosystem functionality implement changes, while maintaining human well‐being. this paper, we present conceptual framework that identifies process cascades links identify variables governing map interrelations. Climate is main external driver, it affects through precipitation, temperature, wind action, geomorphic factors, turn influence physical biological attributes IRES. Monitoring knowledge gaps presented from framework, highlighting need solutions for monitoring mapping spatio‐temporal variability flow regimes bio‐physical quantifying services integrated environmental management. Finally, argue remote sensing techniques, specifically, combined use unmanned aerial vehicles structure motion photogrammetry, key bridging meeting managing
Язык: Английский
Процитировано
59
Ecological Indicators, Год журнала: 2019, Номер 111, С. 105982 - 105982
Опубликована: Дек. 16, 2019
Stream water quality assessments are conducted by analysing invertebrate communities as a biological element (BQE). In Denmark, of streams often estimated according to the Danish Fauna Index (DSFI). The conventional DSFI method is time consuming and requires highly specialized expertise for species identification relevant indicator invertebrates. Furthermore, indicators may be hampered differences in, or lack of, developmental stages due damages during sampling process. Metabarcoding has potential overcome challenges associated with morphology-based identification. Using high-throughput DNA sequencing, metabarcoding invertebrates collected from stream provides an alternative taxonomic experts. present study applies using universal primers targeting mitochondrial cytochrome oxidase I (COI) gene determine qualities. obtained community profiles were compared Multivariate data analysis sequences resulted in distinct clusters units, which reflected defined DSFI. conclusion, supports knowledge that efficient BQE assessment. sequencing provided unique fingerprint studied was successful describing quality.
Язык: Английский
Процитировано
56
Scientific Reports, Год журнала: 2021, Номер 11(1)
Опубликована: Ноя. 2, 2021
Abstract Looking across a landscape, river networks appear deceptively static. However, flowing streams expand and contract following ever-changing hydrological conditions of the surrounding environment. Despite ecological biogeochemical value rivers with discontinuous flow, deciphering temporary nature quantifying their extent remains challenging. Using unique observational dataset spanning diverse geomorphoclimatic settings, we demonstrate existence general hierarchical structuring network dynamics. Specifically, stream activation follows fixed repeatable sequence, in which least persistent sections activate only when most ones are already flowing. This phenomenon not facilitates monitoring activities, but enables development mathematical framework that elucidates how climate drives temporal variations active length. As gets drier, average fraction decreases while its relative variability increases. Our study provides novel conceptual basis for characterizing impacts.
Язык: Английский
Процитировано
42
Ecological Indicators, Год журнала: 2022, Номер 137, С. 108693 - 108693
Опубликована: Март 5, 2022
In these times of strong pressure on aquatic ecosystems and water resources due to climate change abstraction, intermittent rivers ephemeral streams (IRES) (rivers that periodically cease flow and/or dry) have become valuable assets. Indeed, not only do they supply but also offer services for humanity. Despite a growing recognition towards IRES, information assessing their ecosystem (ES) remains scarce. first step, an international interdisciplinary group researchers developed methodological framework acknowledge ES provided by IRES using 109 indicators. A subset selected indicators was then applied two case studies: the Rio Seco in Algarve (Portugal) Giofyros River Crete (Greece). This paper discusses applicability indicators, including temporal spatial variability regimes. Aspects framework, such as methods time required data collection, nature (demand or supply) functionality each indicator are discussed. The new accounts intermittence analyses can help scientists managers i) increase ease justification use management approaches ii) improve conservation restoration with comprehensive set appropriate IRES. addition, proposed ensures be understood broad audience easily applicable. Since were designed through public participation process, setting has been prepared holistic stakeholder analysis education around functions associated ES. From point view, it would particularly relevant perform economic evaluation this understand value category trade-offs. For scientific community, however, is important consider preferences design socially accepted policies. successfully bridge elements, hereby establishing solid basis assessment
Язык: Английский
Процитировано
30
The Science of The Total Environment, Год журнала: 2018, Номер 628-629, С. 1308 - 1316
Опубликована: Фев. 20, 2018
Язык: Английский
Процитировано
53
Journal of Applied Ecology, Год журнала: 2019, Номер 57(2), С. 283 - 295
Опубликована: Дек. 17, 2019
Abstract Ecosystems experience natural disturbances and anthropogenic impacts that affect biological communities ecological processes. When disturbance modifies impacts, current widely used bioassessment metrics can prevent accurate assessment of quality. Our aim was to assess the ability biomonitoring detect at both perennial intermittent sites, in latter including flowing disconnected pool aquatic phases. Specifically, macroinvertebrates from 20 rivers were sampled along gradients flow intermittence (natural disturbance) investigate their combined effects on river (i.e. taxonomic richness standard indices) novel functional metrics, redundancy number taxa contributing similarly an ecosystem function, here a trophic function) response diversity how functionally similar respond impacts). Only IBMWP index (Iberian Biological Monitoring Working Party) able when during Several also detected regardless intermittence. Besides, entire community remained effective even pools. Synthesis applications . results show confound bioassessment, set new could be as alternatives naturally disturbed rivers. findings suggest water managers should incorporate alternative routine
Язык: Английский
Процитировано
52
Advances in Water Resources, Год журнала: 2019, Номер 126, С. 129 - 136
Опубликована: Фев. 26, 2019
Язык: Английский
Процитировано
43