The role of environmental conditions, climatic factors and spatial processes in driving multiple facets of stream macroinvertebrate beta diversity in a climatically heterogeneous mountain region

Ecological Indicators, Journal Year: 2021, Volume and Issue: 124, P. 107407 - 107407

Published: Jan. 27, 2021

There is a growing recognition that examining patterns of ecological communities and their underlying determinants not only feasible based on taxonomic data, but also functional phylogenetic approaches. This because these additional facets can enhance the understanding relative contribution multiple processes in shaping biodiversity. However, few studies have focused multifaceted beta diversities lotic macroinvertebrates, especially when considering driving factors operating at spatial scales. Here, we examined multi-faceted (i.e., taxonomic, phylogenetic) diversity components turnover nestedness) macroinvertebrates 50 sites 10 streams situated north south slope Qinling Mountains, geographical dividing line Northern Southern China. We found draining showed significantly lower values all three than slope. Such north-to-south increases were caused by distinct climatic local environmental conditions between sides mountain range. Moreover, variables generally played most important role structuring diversity, followed variables, whereas catchment less important. Despite similar results explanatory each facet, details community-environment relationships (e.g., power) among different components. In conclusion, measuring provides complementary information to traditional approach. Therefore, an integrative approach embracing better reveal mechanisms biodiversity, which essential assessing valuing aquatic ecosystems for biodiversity management conservation.

Language: Английский

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Loss of functionally important and regionally endemic species from streams forced into intermittency by global warming

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(11), P. 3019 - 3038

Published: Feb. 22, 2023

Climate change is altering hydrological cycles globally, and in Mediterranean (med-) climate regions it causing the drying of river flow regimes, including loss perennial flows. Water regime exerts a strong influence over stream assemblages, which have developed geological timeframes with extant regime. Consequently, sudden formerly streams expected to large, negative impacts on fauna. We compared contemporary (2016/17) macroinvertebrate assemblages that became intermittently flowing (since early 2000s) recorded same by study conducted pre-drying (1981/82) med-climate region southwestern Australia (the Wungong Brook catchment, SWA), using multiple before-after, control-impact design. Assemblage composition reaches remained changed very little between studies. In contrast, recent intermittency had profound effect species impacted drying, extirpation nearly all Gondwanan relictual insect species. New arriving at intermittent tended be widespread, resilient desert-adapted taxa. Intermittent also distinct due part differences their hydroperiods, allowing establishment winter summer longer-lived pools. The remaining only refuge for ancient relict place catchment where many these still persist. fauna SWA upland becoming homogenised wider Western Australian landscape, as drought-tolerant, widespread replace local endemics. Flow caused situ alterations assemblage demonstrates threat posed faunas climates are drying.

Language: Английский

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Recent trends in stream macroinvertebrates: warm-adapted and pesticide-tolerant taxa increase in richness

Biology Letters, Journal Year: 2022, Volume and Issue: 18(3)

Published: March 1, 2022

Recently, a plethora of studies reporting insect declines has been published. Even though the common theme is decreasing richness, positive trends have also documented. Here, we analysed nationwide, systematic monitoring data on aquatic richness collected at 438 sites in Switzerland from 2010 to 2019. In addition taxonomic grouped taxa accordance with their ecological preferences and functional traits gain better understanding possible underlying mechanisms. We found that general, insects remained stable or increased time. Warm-adapted taxa, feeding guilds pesticide-tolerant showed increasing patterns while cold-adapted, rarer pesticide-sensitive displayed trends. Both climate land-use-related factors were most important explanatory variables for richness. Although our cover last decade only, results suggest recent developments are context-dependent affect groups differently. However, longer investigations good baseline reveal if increase temperature- species will lead decrease specialized homogenization biotic communities long term.

Language: Английский

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Non-interactive effects drive multiple stressor impacts on the taxonomic and functional diversity of atlantic stream macroinvertebrates

Environmental Research, Journal Year: 2023, Volume and Issue: 229, P. 115965 - 115965

Published: April 25, 2023

Freshwaters are considered among the most endangered ecosystems globally due to multiple stressors, which coincide in time and space. These local stressors typically result from land-use intensification or hydroclimatic alterations, others. Despite recent advances on stressor effects, current knowledge is still limited manipulative approaches minimizing biological abiotic variability. Thus, assessment of effects real-world required. Using an extensive survey 50 stream reaches across North Portugal, we evaluated taxonomic functional macroinvertebrate responses including marked gradients nutrient enrichment, flow reduction, riparian vegetation structure, thermal stress dissolved oxygen depletion. We analyzed two (taxon richness, Shannon-diversity) trait-based diversity indices (functional dispersion), as well changes trait composition. found that had additive all metrics, with enrichment identified important three out four followed by depletion stress. Taxon Shannon-diversity richness responded similarly, whereas dispersion was driven velocity Functional composition changed along a major gradient determined depletion, positively correlated organisms possessing fast-living strategies, aerial respiration, adult phases, gathering-collector feeding habits. Overall, our results reinforce need consider complementary facets biodiversity better identify assembly processes response stressors. Our data suggest interactions may be less frequent real-word streams than predicted experiments, can facilitate mitigation strategies. By combining field integrative consideration facets, study provides new insights help assess manage rivers global change context.

Language: Английский

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Using functional traits of chironomids to determine habitat changes in subtropical wetlands

Ecological Indicators, Journal Year: 2024, Volume and Issue: 159, P. 111656 - 111656

Published: Feb. 1, 2024

Ecosystem functions in wetlands are increasingly degrading under the multiple stresses of climate change and human disturbances. Traditional wetland bioassessment is usually based on taxonomic approaches but this approach has limitations. To explore effectiveness functional traits response to environmental changes, we compared traditional composition chironomid communities with a trait-based subtropical subalpine (Central China) spanning wide habitat gradient from dry peatland inundated pools. The results revealed that 57 % trait groups only 38 examined were significantly different between diverse habitats. Sphagnum moss hummocks generally inhabited by larvae collector-gatherers, small body-sized individuals sprawlers, while pools supported high abundance shredders, large burrowers. Ecotones had more niche opportunities hence possessed diversity. Ordination analyses indicated three similar variables (loss-on-ignition (LOI), depth water table (DWT) K+) most powerful explanations variability both compositions. LOI DWT interacted strongly dominant controls communities. Our research demonstrated chironomids robust sensitive than taxonomy-based therefore could be an alternative for aquatic ecosystem functioning palaeo-studies wetlands.

Language: Английский

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Effect of nutrient enrichment on alpha and beta diversity of macroinvertebrate community in a boreal river of northern China

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: April 1, 2025

Nutrient enrichment has long been recognized as a major threat to freshwater ecosystems. Mounting evidence suggests that nutrient leads decline in the biodiversity and functional homogenization of species, manifested alpha or beta diversity indices. While several studies have investigated effects on macroinvertebrates, comprehensive analysis taxonomic, functional, phylogenetic at levels remains relatively scarce. Therefore, data macroinvertebrate assemblage structure environmental factors were collected northern Chinese rivers elucidate response their multidimensional enrichment. The results revealed most significant factor, an increase total phosphorus not only reduced evenness dispersion within community level, leading benthic but also enhanced nested components turnover component level. This shift resulted loss endemic which stabilized structure. However, this community, composed universal markedly reduces ecosystem's resistance changes. Additionally, by constructing structural equation model, effect was found be more pronounced than taxonomic diversity. Collectively, these findings provide valuable insights for integrated research conservation nutrient-enriched river

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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The Biology and Ecology of Streams and Rivers

Oxford University Press eBooks, Journal Year: 2023, Volume and Issue: unknown

Published: May 30, 2023

Abstract A major textbook on running waters, promoting understanding of the nature rivers as ecosystems, and detailing biodiversity natural history their biota. The book takes a primarily biological approach to river ecology, dealing with scientific questions about but referring throughout possible applications approaches management. notion habitat templet refers suite environmental factors that face lotic organisms adaptations traits enable survival in such challenging environments. How does complex, patchy whole-river networks impinge population dynamics communities? Species interactions food web linkages determine flow energy material through communities lead ecosystem processes metabolism (the balance primary production community respiration) ecology nutrients. stresses systems ‘open’ exchanging materials land downstream systems. can be sustainable part capital which we all depend? In final chapter forward-looking view is progressively devoted applied questions. Biology Ecology Streams Rivers seeks provide knowledge necessary for their, our, future. We need appreciate ‘what do us’ reverse deterioration waters an increasingly thirsty, hungry changing world.

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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Impact of wastewater treatment and drought in an Alpine region: a multidisciplinary case study

Heliyon, Journal Year: 2024, Volume and Issue: 10(15), P. e35290 - e35290

Published: July 26, 2024

Language: Английский

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