Measures to safeguard and restore river connectivity

Environmental Reviews, Год журнала: 2023, Номер 32(3), С. 366 - 386

Опубликована: Июнь 22, 2023

Freshwater connectivity and the associated flow regime are critical components of health freshwater ecosystems. When ecosystems fragmented, movements flows species, nutrients, sediments, water altered, changing natural dynamics The consequences these changes include declines loss species populations ecosystems, alterations in delivery certain ecosystem services, such as fisheries, buffering flood events, healthy deltas, recreational cultural values, others. Measures exist that can maintain restore or mitigate against its face constructed barriers other habitat alterations. These measures system-scale planning for energy resources includes options limiting connectivity; putting place protections keeping critically important habitats connected; mitigating impacts on via barrier design, fish passage, implementation environmental flows; restoring freshwaters removal reconnection rivers, wetlands, floodplains active management groundwater recharge. We present case studies applied Europe, Asia, Africa, Americas reflect next generation innovation needed to further enhance advance restoration protection mitigation impacts.

Язык: Английский

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One Hundred Pressing Questions on the Future of Global Fish Migration Science, Conservation, and Policy

Frontiers in Ecology and Evolution, Год журнала: 2019, Номер 7

Опубликована: Авг. 19, 2019

Migration is a widespread but highly diverse component of many animal life histories. Fish migrate throughout the world's oceans, within lakes and rivers, between two realms, transporting matter, energy, other species (e.g. microbes) across boundaries. therefore process responsible for myriad ecosystem services. Many human populations depend on presence predictable migrations fish their subsistence livelihoods. Although much research has focused migration, questions remain in our rapidly changing world. We assembled team fundamental applied scientists who study marine freshwater environments to identify pressing unanswered questions. Our exercise revealed themes related understanding migrating individual's internal state, navigational mechanisms, locomotor capabilities, external drivers threats confronting migratory including climate change, role migration. In addition, we identified key requirements aquatic management, restoration, policy, governance. Lessons included difficulties generalizing among populations, levels connectivity facilitated by fishes. conclude identifying priority needed assuring sustainable future

Язык: Английский

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The Use of Barriers to Limit the Spread of Aquatic Invasive Animal Species: A Global Review

Frontiers in Ecology and Evolution, Год журнала: 2021, Номер 9

Опубликована: Фев. 9, 2021

Aquatic invasive species (AIS) are one of the principal threats to freshwater biodiversity. Exclusion barriers increasingly being used as a management strategy control spread AIS. However, exclusion can also impact native organisms and their effectiveness is likely be context dependent. We conducted quantitative literature review evaluate use animal AIS in ecosystems worldwide. The aspect was supplemented by case studies that describe some challenges, successes, opportunities for globally. Barriers have been since 1950s AIS, but effort has increasing 2005 (80% studies) an diverse range taxa now targeted wide habitat types. global concentrated North America (74% studies), Australasia (11%), Europe (10%). Physical (e.g., weirs, screens, velocity barriers) most widely (47%), followed electric (27%) chemical (12%). Fish were (86%), crustaceans (10%), molluscs (3%) amphibians (1%). Most moderately successful limiting passage with 86% tested deterring >70% individuals. only 25% evaluated barrier impacts on species, development selective still its infancy. too short (47% < 1 year, 87% 5 years) detect ecological or failed robust before-after-control-impact (BACI) study designs (only 5%). Hence, more effective monitoring required assess long-term tool. Our highlight pressing need many ecoregions, potential become tool situations. design operation must refined deliver fauna, should sparingly part wider integrated strategy.

Язык: Английский

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From meta‐system theory to the sustainable management of rivers in the Anthropocene

Frontiers in Ecology and the Environment, Год журнала: 2021, Номер 20(1), С. 49 - 57

Опубликована: Окт. 5, 2021

Regional-scale ecological processes, such as the spatial flows of material, energy, and organisms, are fundamental for maintaining biodiversity ecosystem functioning in river networks. Yet these processes remain largely overlooked most management practices underlying policies. Here, we propose adoption a meta-system approach, where regional acting at different levels organization - populations, communities, ecosystems integrated into conventional conservation, restoration, biomonitoring. We also describe series measurements indicators that could be assimilated implementation relevant environmental Finally, highlight need alternative strategies can guide practitioners toward applying recent advances ecology to preserve restore services they provide, context increasing alteration network connectivity worldwide.

Язык: Английский

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Aquatic connectivity: challenges and solutions in a changing climate

Journal of Fish Biology, Год журнала: 2024, Номер 105(2), С. 392 - 411

Опубликована: Апрель 7, 2024

The challenge of managing aquatic connectivity in a changing climate is exacerbated the presence additional anthropogenic stressors, social factors, and economic drivers. Here we discuss these issues context structural functional for biodiversity, specifically fish, both freshwater marine realms. We posit that adaptive management strategies consider shifting baselines socio-ecological implications change will be required to achieve objectives. role renewable energy expansion, particularly hydropower, critically examined its impact on connectivity. advocate strategic spatial planning incorporates nature-positive solutions, ensuring mitigation efforts are harmonized with biodiversity conservation. underscore urgency integrating robust scientific modelling stakeholder values define clear, Finally, call innovative monitoring predictive decision-making tools navigate uncertainties inherent climate, goal resilience sustainability ecosystems.

Язык: Английский

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One hundred research questions in conservation physiology for generating actionable evidence to inform conservation policy and practice

Conservation Physiology, Год журнала: 2021, Номер 9(1)

Опубликована: Янв. 1, 2021

Abstract Environmental change and biodiversity loss are but two of the complex challenges facing conservation practitioners policy makers. Relevant robust scientific knowledge is critical for providing decision-makers with actionable evidence needed to inform decisions. In Anthropocene, science that leads meaningful improvements in conservation, restoration management desperately needed. Conservation Physiology has emerged as a discipline well-positioned identify mechanisms underpinning population declines, predict responses environmental test different situ ex interventions diverse taxa ecosystems. Here we present consensus list 10 priority research themes. Within each theme specific questions (100 total), answers which will address problems should improve biological resources. The themes frame set related following: (i) adaptation phenotypic plasticity; (ii) human–induced change; (iii) human–wildlife interactions; (iv) invasive species; (v) methods, biomarkers monitoring; (vi) policy, engagement communication; (vii) pollution; (viii) actions; (ix) threatened (x) urban systems. hopefully guide inspire researchers while also helping demonstrate makers many ways physiology can help support their

Язык: Английский

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Managing Freshwater Fish in a Changing Climate: Resist, Accept, or Direct

Fisheries, Год журнала: 2022, Номер 47(6), С. 245 - 255

Опубликована: Янв. 10, 2022

Abstract Climate change is altering the distribution, phenology (e.g., timing of spawning), and community dynamics freshwater fishes. Managers have three options for responding to these changes: “Resist” maintain or restore historic abiotic biological conditions; “Accept” manage within new “Direct” produce conditions considered desirable by humans. I discuss how inland fisheries management approaches stocking, regulations, habitat improvement, manipulations can be applied Resist-Accept-Direct (RAD) framework. also ways choose among ecological tipping points used determine when Resist no longer a feasible option managers must shift Accept Direct options.

Язык: Английский

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Overcoming the concrete conquest of aquatic ecosystems

Biological Conservation, Год журнала: 2020, Номер 247, С. 108589 - 108589

Опубликована: Май 25, 2020

Язык: Английский

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Single-Stream Recycling Inspires Selective Fish Passage Solutions for the Connectivity Conundrum in Aquatic Ecosystems

BioScience, Год журнала: 2020, Номер 70(10), С. 871 - 886

Опубликована: Июль 25, 2020

Barrier removal is a recognized solution for reversing river fragmentation, but restoring connectivity can have consequences both desirable and undesirable species, resulting in conundrum. Selectively passing taxa while restricting the dispersal of (selective connectivity) would solve many aspects Selective technical challenge sorting an assortment things. Multiattribute systems exist other fields, although none yet been devised freely moving organisms within river. We describe approach to selective fish passage that integrates ecology biology with engineering designs modeled after material recycling processes mirror stages passage: approach, entry, passage, fate. A key feature this concept integration multiple each targeting specific attribute. Leveraging concepts from sectors improve ecosystem function may yield fast, reliable solutions

Язык: Английский

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Anguillid eels as a surrogate species for conservation of freshwater biodiversity in Japan

Scientific Reports, Год журнала: 2020, Номер 10(1)

Опубликована: Май 29, 2020

Abstract To monitor and manage biodiversity, surrogate species (i.e., indicator, umbrella flagship species) have been proposed where conservation resources are focused on a limited number of focal organisms. Using data obtained from 78 sites across six rivers in the mainland Japan Amami-Oshima Island, we demonstrate that two anguillids – Japanese eel ( Anguilla japonica ) giant mottled A. marmorata can act as for freshwater biodiversity. Anguillid eels were widest topographically-distributed ranging near mouth to upper reaches rivers. Moreover, stable isotopic analyses indicated likely one highest-order predators ecosystems. A significant positive relationship was found between density other diadromous collected. However, optimal models revealed both significantly negatively correlated with distance river cumulative height trans-river structures each site. This suggests indirect related river-ocean connectivity. Given their catadromous life-cycle, global commercial cultural importance, taxa, anguillid species, comprehensive

Язык: Английский

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