Wetlands, Год журнала: 2025, Номер 45(5)
Опубликована: Июнь 1, 2025
Язык: Английский
Science, Год журнала: 2022, Номер 375(6582), С. 753 - 760
Опубликована: Фев. 17, 2022
Proposed hydropower dams at more than 350 sites throughout the Amazon require strategic evaluation of trade-offs between numerous ecosystem services provided by Earth's largest and most biodiverse river basin. These are spatially variable, hence collective impacts newly built depend strongly on their configuration. We use multiobjective optimization to identify portfolios that simultaneously minimize flow, connectivity, sediment transport, fish diversity, greenhouse gas emissions while achieving energy production goals. find uncoordinated, dam-by-dam expansion has resulted in forgone service benefits. Minimizing further damage from development requires considering diverse environmental across entire basin, as well cooperation among Amazonian nations. Our findings offer a transferable model for transboundary basins.
Язык: Английский
Процитировано
135
Scientific Data, Год журнала: 2020, Номер 7(1)
Опубликована: Март 19, 2020
Abstract The Amazon Basin is an unquestionable biodiversity hotspot, containing the highest freshwater on earth and facing off a recent increase in anthropogenic threats. current knowledge spatial distribution of fish species greatly deficient this basin, preventing comprehensive understanding hyper-diverse ecosystem as whole. Filling gap was priority transnational collaborative project, i.e . AmazonFish project - https://www.amazon-fish.com/ Relying outputs we provide most complete records covering whole drainage. database, including 2,406 validated native species, 232,936 georeferenced records, results from extensive survey 590 different sources ( e.g published articles, grey literature, online databases scientific collections museums universities worldwide) field expeditions conducted during project. This delivered at both localities (21,500 localities) sub-drainages grains (144 units), represents highly valuable source information for further studies biodiversity, biogeography conservation.
Язык: Английский
Процитировано
138
Global Change Biology, Год журнала: 2020, Номер 26(10), С. 5509 - 5523
Опубликована: Авг. 12, 2020
Abstract Upstream range shifts of freshwater fishes have been documented in recent years due to ongoing climate change. River fragmentation by dams, presenting physical barriers, can limit the climatically induced spatial redistribution fishes. Andean ecosystems Neotropical region are expected be highly affected these future disturbances. However, proper evaluations still missing. Combining species distribution models and functional traits Amazon fishes, coupled with dam locations climatic projections (2070s), we (a) evaluated potential impacts on ranges, (b) investigated combined impact river change (c) tested relationships between traits. Results show that will induce contraction for most fish species, particularly those inhabiting highlands. Dams not predicted greatly (i.e., Barrier effect). some barriers should prevent upstream a considerable number reducing diversity basins. is act jointly promoting decrease probability persist long‐term because splitting ranges smaller fragments Isolation Benthic fast‐flowing water adapted hydrodynamic bodies significantly associated severe contractions from
Язык: Английский
Процитировано
87
Acta Amazonica, Год журнала: 2024, Номер 54(spe1)
Опубликована: Янв. 1, 2024
ABSTRACT Amazonia (defined herein as the Amazon basin) is home to greatest concentration of biodiversity on Earth, providing unique genetic resources and ecological functions that contribute ecosystem services globally. The lengthy complex evolutionary history this region has produced heterogeneous landscapes riverscapes at multiple scales, altered geographic connections among populations, impacted rates adaptation, speciation, extinction. In turn, ecologically diverse Amazonian biotas promoted further diversification, species coexistence, coevolution, with accumulating over tens millions years. Important events in included: (i) late Cretaceous early Paleogene origin major rainforest plant animal groups; (ii) Eocene-Oligocene global cooling rainforests contracting tropical latitudes separating Atlantic coastal rainforests; (iii) Miocene uplift central northern Andes separated Pacific rainforests, spurred formation mega-wetlands western Amazon, contributed modern transcontinental River; (iv) Neogene Panamanian Isthmus facilitated Great American Biotic Interchange; (v) Pleistocene climate oscillations followed by Pleistocene-Holocene human colonization megafaunal extinctions; (vi) era widespread anthropogenic deforestation, defaunation, transformations regional climates. conservation requires decade-scale investments into documentation monitoring leverage existing scientific capacity, strategic habitat planning allow continuity processes now future.
Язык: Английский
Процитировано
14
Aquatic Conservation Marine and Freshwater Ecosystems, Год журнала: 2020, Номер 31(5), С. 1136 - 1149
Опубликована: Авг. 17, 2020
Abstract The extent and intensity of impacts multiple new dams in the Amazon basin on specific biological groups are potentially large, but still uncertain need to be better understood. It is known that river disruption regulation by may affect sediment supplies, channel migration, floodplain dynamics, and, as a major adverse consequence, likely decrease or even suppress ecological connectivity among populations aquatic organisms dependent upon seasonally flooded environments. This article complements our previous results assessing relationships between dams, Dam Environmental Vulnerability Index (DEVI), biotic environments threatened effects dams. Because cartographic representation DEVI, it useful tool compare potential hydrophysical proposed with spatial distribution diversity. As impact Amazonian biota both rivers periodically riparian severe, DEVIs from different tributary basins contrasted patterns diversity fish, forest trees bird species. There consistent relationship higher DEVI values species richness endemism all three groups. An assessment vulnerability at scale basins, biodiversity related analysis teleconnections scale, demonstrate recent construction affecting basin. evidence presented here predicts that, if currently planned built without considering balance energy production environmental conservation, their cumulative will increase drastically represent threat biodiversity.
Язык: Английский
Процитировано
70
Water Research, Год журнала: 2021, Номер 200, С. 117251 - 117251
Опубликована: Май 17, 2021
Язык: Английский
Процитировано
48
Frontiers in Ecology and Evolution, Год журнала: 2021, Номер 9
Опубликована: Июнь 10, 2021
Non-native fish (NNF) can threaten megadiverse aquatic ecosystems throughout the planet, but limited information is available for Amazon Region. In this study we review NNF data in Amazonian macroregion using spatiotemporal records on occurrence and richness of from a collaborative network 35 regional experts, establishing database (ANNF). The species was analyzed by river basin country, as well policies each geopolitical division Amazon. analysis included six countries (Brazil, Peru, Bolivia, Ecuador, Venezuela, Colombia), together comprising more than 80% A total 1314 were gathered. first record region 1939 there has been marked increase last 20 years (2000–2020), during which 75% observed. highest number localities with observed Colombia, followed Brazil Bolivia. include 9 orders, 17 families 41 species. Most are also used aquaculture (12 species) aquarium trade species). most frequent detected Arapaima gigas, Poecilia reticulata Oreochromis niloticus . current highlight that few documented cases Amazon, their negative impacts management strategies adopted. Region represents threat to native biodiversity increasing “silently” due difficulties large-scale sampling low reported when compared other South American regions. adoption effective measures decision-makers urgently needed enforcement change alarming trend help protect Amazon’s diversity.
Язык: Английский
Процитировано
46
Aquatic Conservation Marine and Freshwater Ecosystems, Год журнала: 2020, Номер 31(5), С. 1167 - 1189
Опубликована: Сен. 15, 2020
Abstract Freshwater ecosystems represent less than 0.01% of Earth's surface water but proportionately encompass the most species‐rich environment on planet, including nearly one‐third all vertebrate species. Even though inland continental waters are widely regarded as highly endangered ecosystems, their species assemblages mostly ignored in conservation plans, largely because spatial patterns freshwater remain poorly understood. This is particularly severe throughout Neotropics, notably Amazon superbasin, where sheer biotic diversity coupled with a lack biodiversity knowledge at several levels. Spatial Neotropical fishes focusing mainly superbasin were investigated. First, Endemic Amazonian Fish Areas (EAFAs) representing central units for delimited. Interpolated maps then analysed using alternative methodologies to delimit and endemicity across superbasin. Several biogeographical analyses used comprehensive dataset geographical coordinates fishes. The results reveal well‐defined richness fish fauna, showing that protected areas concentrated single bioregion (Amazon lowlands). Those incongruent insufficient protect endemic threatened species, which distributed upland regions. Effective fauna should include EAFAs within areas, especially those undergoing deforestation hydropower development pressure containing high concentration following be considered priorities: Upper Araguaia, Tocantins, Lower Teles Pires/Serra do Cachimbo, Chapada dos Parecis Marañon. These regions urgently avert loss important trophic relationships unique elements fauna.
Язык: Английский
Процитировано
50
Biological Conservation, Год журнала: 2021, Номер 257, С. 109090 - 109090
Опубликована: Апрель 16, 2021
Язык: Английский
Процитировано
38
Journal of Experimental Biology, Год журнала: 2022, Номер 225(10)
Опубликована: Май 15, 2022
ABSTRACT Amazonia is home to 15% (>2700, in 18 orders) of all the freshwater fish species world, many endemic region, has 65 million years evolutionary history and accounts for 20% discharge oceans. These characteristics make a unique region world. We review geological environment, its current biogeochemistry forces that led present are distributed amongst three very different water types: black waters [acidic, ion-poor, rich dissolved organic carbon (DOC)], white (circumneutral, particle-rich) clear DOC-poor). The annual flood pulse major ecological driver fish, providing feeding, breeding migration opportunities, profoundly affecting O2, CO2 DOC regimes. Owing climate change other anthropogenic pressures such as deforestation, pollution governmental mismanagement, now crisis. environment becoming hotter drier, more intense frequent pulses occurring, with greater variation between high low levels. Current projections Amazon near future will be even hotter, acidic, darker (i.e. DOC, suspended particles), higher ions, lower synergistic effects. physiological information on focusing temperature tolerance ionoregulatory strategies dealing acidic ion-poor environments. also discuss influences particles gill function, effects emphasis water- versus air-breathing mechanisms, pH compensation. conclude elevations most critical factor, eliminating species. Climate likely favour predominantly water-breathing routine metabolic rates, sensitivity anaerobic capacity, hypoxia thermal tolerance.
Язык: Английский
Процитировано
27