Non-perennial segments in river networks

Nature Reviews Earth & Environment, Journal Year: 2023, Volume and Issue: 4(12), P. 815 - 830

Published: Nov. 23, 2023

Language: Английский

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Towards harmonized standards for freshwater biodiversity monitoring and biological assessment using benthic macroinvertebrates

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 918, P. 170360 - 170360

Published: Feb. 2, 2024

Monitoring programs at sub-national and national scales lack coordination, harmonization, systematic review analysis continental global scales, thus fail to adequately assess evaluate drivers of biodiversity ecosystem degradation loss large spatial scales. Here we the state art, gaps challenges in freshwater assessment for both biological condition (bioassessment) monitoring ecosystems using benthic macroinvertebrate community. To existence nationally- regionally- (sub-nationally-) accepted protocols that are put practice/used each country, conducted a survey from November 2022 May 2023. Responses 110 respondents based 67 countries were received. Although responses varied their consistency, clearly demonstrated being done levels lakes, rivers artificial waterbodies. Programs bioassessment more widespread, some cases even harmonized among several countries. We identified 20 challenges, which classed into five major categories, these (a) field sampling, (b) sample processing identification, (c) metrics indices, (d) assessment, (e) other challenges. Above all, identify harmonization as one most important gaps, hindering efficient collaboration communication. IUCN SSC Global Freshwater Macroinvertebrate Sampling Protocols Task Force (GLOSAM) means address globally-harmonized protocols.

Language: Английский

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Water quality, biological quality, and human well-being: Water salinity and scarcity in the Draa River basin, Morocco

Ecological Indicators, Journal Year: 2023, Volume and Issue: 148, P. 110050 - 110050

Published: Feb. 26, 2023

River ecosystems are being threatened by rising temperatures, aridity, and salinity due to climate change increased water abstractions. These threats also put human well-being at risk, as people rivers closely connected, particularly in water-scarce regions. We aimed investigate the relationship between biological physico-chemical river quality using arid Draa basin a case study. Physico-chemical measurements, monitoring of aquatic macroinvertebrates, household surveys were used assess state water, ecosystem, well-being, well associations them. Salinity levels exceeded maximum permissible values for drinking 35 % irrigation 12 sites. low flow associated with quality. Human satisfaction quantity quality, agriculture, natural environment, overall life Middle Draa, where 89% respondents reported emotional distress scarcity. Drinking was generally rated lower areas characterized higher The study found positive indices, but no significant association these factors satisfaction. findings suggest that physicochemical is complex more comprehensive approach likely needed establish relationships.

Language: Английский

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N‐dimensional hypervolumes in trait‐based ecology: Does occupancy rate matter?

Functional Ecology, Journal Year: 2023, Volume and Issue: 37(7), P. 1802 - 1814

Published: May 7, 2023

Abstract Many methods for estimating the functional diversity of biological communities rely on measuring geometrical properties n‐dimensional hypervolumes in a trait space. To date, these are calculated from individual or their pairwise combinations. Our capacity to detect patterns due overlap multiple is, thus, limited. Here, we propose new approach set hypervolumes. We concept occupancy rate, defined as mean absolute number enclosing given point Furthermore, describe permutation test identify regions space which rate two sets differs. illustrate utility our over existing with examples aquatic macroinvertebrates. The first example shows how relates stability utilisation increased flow intermittency and allows identification taxa low rates. second based rates can differences river morphology variation even high degree among input newly developed is particularly suitable analysis when investigating emphasise need consider analyses into estimation. Read free Plain Language Summary this article Journal blog.

Language: Английский

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Drying shapes the ecological niche of aquatic fungi with implications on ecosystem functioning

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 859, P. 160374 - 160374

Published: Nov. 22, 2022

Fungi are among the most abundant and diverse organisms on Earth play pivotal roles in global carbon processing, nutrient cycling food webs. Despite their functional importance, little is known about patterns mechanisms governing community composition intermittent rivers ephemeral streams, which common fluvial ecosystems globally. Thus far, it that aquatic fungi have evolved various life-history strategies adaptations to cope with drying. Nevertheless, some of these a metabolic cost trade-offs between growth, reproduction dispersion may affect ecosystem functioning. Thus, understanding ecological along gradient drying crucial assess how species will respond change identify meaningful taxa maintain functions. By combining situ hydrological information niche-based approach, we analysed role explaining spatial segregation fungal species, determined specialization affinity over In addition, estimated whether niches good predictors two key processes: organic matter decomposition biomass accrual. Overall, found annual duration frequency were influential variables upon niche differentiation across 15 studied streams. Our cluster analysis identified four groups contrasting distributions responses gradient: drying-sensitive, partly tolerant drying, generalist, drying-resistant specialist. belonging specialist group showed weak contribution both processes, suggesting resistance energy invested growth. Taken together, our results suggest increased water scarcity jeopardise capacity guarantee functioning biogeochemical cycles despite ability

Language: Английский

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Macroinvertebrate community responses to salinity around non-saline–saline confluences in the Draa River basin, Morocco

Hydrobiologia, Journal Year: 2024, Volume and Issue: 851(9), P. 2189 - 2204

Published: Jan. 20, 2024

Abstract Freshwater salinization increasingly threatens river ecosystems in arid regions. In situ studies on effects of salinity freshwater communities are still scarce, especially largely understudied areas Africa. To compare macroinvertebrate differing levels, we conducted a confluence-based study the Draa River basin Morocco by focusing two tributaries and their joint downstream sections, immediate vicinity three confluences. Our revealed that α-diversity differed only minimal. Although around five taxa comprised over 90% specimens per section, more saline sections exhibited proportionally salt-tolerant generalist species. There was lower β-diversity between section each tributary compared to tributaries, indicating mixed community after confluence. The trait profile El Mellah displayed resistance resilience traits disturbances than less Iriri. Furthermore, low water flow reduced abundance sensitive taxa. Overall, observed minimal differences composition, due γ-diversity basin. However, design remains valuable for investigating specific stressors excluding large-scale geographic patterns, as sites close therefore share same climate, geology, altitude.

Language: Английский

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Typology and classification of water quality in an intermittent river in a semi-arid Mediterranean climate

Environmental Monitoring and Assessment, Journal Year: 2024, Volume and Issue: 196(4)

Published: March 19, 2024

Language: Английский

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A bacteria-based index of biotic integrity assesses aquatic ecosystems effectively in rewetted long-term dry river channel after water replenishment

AMBIO, Journal Year: 2024, Volume and Issue: unknown

Published: July 27, 2024

Language: Английский

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Drying Shapes Aquatic Fungal Community Assembly by Reducing Functional Diversity

Diversity, Journal Year: 2023, Volume and Issue: 15(2), P. 289 - 289

Published: Feb. 16, 2023

Aquatic fungi are highly diverse organisms that play a critical role in global biogeochemical cycles. Yet it remains unclear which assembly processes determine their co-occurrence and patterns over gradients of drying intensity, is common stressor fluvial networks. Although aquatic possess drying-specific adaptations, little known about how functional similarity influences probability traits sorted by drying. Using field data from 15 streams, we investigated responded to intensity. To do so, determined fungal patterns, best explain species likelihood, community mechanisms explaining changes diversity the gradient. Our results identified 24 pairs with positive probabilities 16 negative associations. The was correlated differences conidia shape endophytic capacity. Functional reduction gradient generally associated non-random abiotic filtering. However, changed gradient, random prevailing at low intensity filtering gaining more importance as intensifies. Collectively, our can help anticipate impacts change on communities ecosystem functioning.

Language: Английский

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Stressors affecting the ecological status of temporary rivers in the Mediterranean region

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 903, P. 166254 - 166254

Published: Aug. 11, 2023

Language: Английский

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