Disproportionate declines of formerly abundant species underlie insect loss

Nature, Journal Year: 2023, Volume and Issue: 628(8007), P. 359 - 364

Published: Dec. 20, 2023

Abstract Studies have reported widespread declines in terrestrial insect abundances recent years 1–4 , but trends other biodiversity metrics are less clear-cut 5–7 . Here we examined long-term 923 assemblages monitored 106 studies, and found concomitant abundance species richness. For studies that were resolved to level (551 sites 57 studies), observed a decline the number of initially abundant through time, not very rare species. At population level, most at start time series showed strongest average (corrected for regression-to-the-mean effects). Rarer were, on average, also declining, these offset by increases Our results suggest decreases total 2 can mostly be explained formerly This counters common narrative loss is characterized 8,9 Although our fundamental changes occurring assemblages, it important recognize they represent only from those locations which sufficient data available. Nevertheless, given importance ecosystems 10 their general likely broad repercussions food webs ecosystem functioning.

Language: Английский

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Synthesis reveals approximately balanced biotic differentiation and homogenization

Science Advances, Journal Year: 2024, Volume and Issue: 10(8)

Published: Feb. 21, 2024

It is commonly thought that the biodiversity crisis includes widespread declines in spatial variation of species composition, called biotic homogenization. Using a typology relating homogenization and differentiation to local regional diversity changes, we synthesize patterns across 461 metacommunities surveyed for 10 91 years, 64 checklists (13 500+ years). Across all datasets, found no change was most common outcome, but with many instances differentiation. A weak homogenizing trend 0.3% increase shared among communities/year on average driven by increased numbers (high occupancy) strongly associated checklist data have longer durations large scales. At smaller temporal scales, show can be changes number distributions both rare species. The multiscale perspective introduced here help identify scale-dependent drivers underpinning

Language: Английский

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Density declines, richness increases, and composition shifts in stream macroinvertebrates

Science Advances, Journal Year: 2023, Volume and Issue: 9(18)

Published: May 3, 2023

Documenting trends of stream macroinvertebrate biodiversity is challenging because biomonitoring often has limited spatial, temporal, and taxonomic scopes. We analyzed composition assemblages >500 genera, spanning 27 years, 6131 sites across forested, grassland, urban, agricultural land uses throughout the United States. In this dataset, density declined by 11% richness increased 12.2%, insect 23.3 6.8%, respectively, over years. addition, differences in between urban versus forested grassland streams have time. Urban lost few disturbance-sensitive taxa they once had gained disturbance-tolerant taxa. These results suggest that current efforts to protect restore are not sufficient mitigate anthropogenic effects.

Language: Английский

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Biodiversity responses to agricultural practices in cropland and natural habitats

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 922, P. 171296 - 171296

Published: Feb. 27, 2024

Language: Английский

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Land Use Change Consistently Reduces α‐ But Not β‐ and γ‐Diversity of Bees

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(1)

Published: Jan. 1, 2025

ABSTRACT Land use change threatens global biodiversity and compromises ecosystem functions, including pollination food production. Reduced taxonomic α‐diversity is often reported under land change, yet the impacts could be different at larger spatial scales (i.e., γ‐diversity), either due to reduced β‐diversity amplifying diversity loss or increased dampening loss. Additionally, studies focus on diversity, while other important components, phylogenetic can exhibit differential responses. Here, we evaluated how agricultural urban alters α‐, β‐, γ‐diversity of an pollinator taxon—bees. Using a multicontinental dataset 3117 bee assemblages from 157 studies, found that was by 16%–18% in both habitats relative natural habitats. Phylogenetic decreased 11%–12% Compared with habitats, 11% 6% respectively, but exhibited no systematic We detected 22% decline 17% not significantly These findings highlight threat expansions large‐scale decline. In addition, urbanization agriculture lead consistent declines α‐diversity, their β‐ vary, highlighting need study effects multiple scales.

Language: Английский

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The meaning of Benthic Ecological Quality status through a warm temperate South African estuary and in a contained blind-ending marina

Ocean & Coastal Management, Journal Year: 2025, Volume and Issue: 262, P. 107550 - 107550

Published: Jan. 24, 2025

Language: Английский

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Chimpanzees (Pan troglodytes) Indicate Mammalian Abundance Across Broad Spatial Scales

Ecology and Evolution, Journal Year: 2025, Volume and Issue: 15(3)

Published: March 1, 2025

ABSTRACT Ongoing ecosystem change and biodiversity decline across the Afrotropics call for tools to monitor state of or elements extensive spatial temporal scales. We assessed relationships in co‐occurrence patterns between great apes other medium large‐bodied mammals evaluate whether ape abundance serves as a proxy mammal diversity broad used camera trap footage recorded at 22 research sites, each known harbor population chimpanzees, some additionally gorillas, 12 sub‐Saharan African countries. From ~350,000 1‐min videos 2010 2016, we estimated mammalian community metrics, including species richness, Shannon diversity, mean animal mass. then fitted Bayesian Regression Models assess potential detection rates (as abundance) these metrics. included site‐level protection status, human footprint, precipitation variance control variables. found that species, well mass were largely positive. In contrast, rate richness less clear differed according site impact context. no association diversity. Our findings suggest chimpanzees hold indicators specific communities, especially population‐level composition‐related characteristics. Declines chimpanzee populations may indicate associated declines sympatric highlight need improved conservation interventions.Changes likely precede extirpation mammals.

Language: Английский

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Quantitative environmental DNA metabarcoding shows high potential as a novel approach to quantitatively assess fish community

Scientific Reports, Journal Year: 2022, Volume and Issue: 12(1)

Published: Dec. 13, 2022

Abstract The simultaneous conservation of species richness and evenness is important to effectively reduce biodiversity loss keep ecosystem health. Environmental DNA (eDNA) metabarcoding has been used as a powerful tool for identifying community composition, but it does not necessarily provide quantitative information due several methodological limitations. Thus, the quantification eDNA through an frontier eDNA-based biomonitoring. Particularly, qMiSeq approach recently developed method attracted much attention its usefulness. aim here was evaluate performance monitoring fish communities by comparing quantified concentrations with results capture surveys. water sampling surveys using electrical shocker were conducted at total 21 sites in four rivers Japan. As result, we found significant positive relationships between each both abundance biomass captured taxon site. Furthermore, seven out eleven taxa, relationship observed sample and/or biomass. In total, our demonstrated that suitable useful communities. Due simplicity analysis, would promote further growth biodiversity.

Language: Английский

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Long‐term drought triggers severe declines in carabid beetles in a temperate forest

Ecography, Journal Year: 2024, Volume and Issue: 2024(4)

Published: Jan. 22, 2024

Evidence for widespread declines in arthropods is growing and climate change one of the suspected drivers. Recent droughts Europe were unprecedented previous centuries we are only beginning to understand impacts on ecosystems. We analysed a 24‐year dataset carabid beetles from temperate forest area northeast Germany investigated linear non‐linear trends abundance, biomass, diversity species traits. especially interested if how these linked at different temporal scales using standardized precipitation evapotranspiration index (SPEI). found significant abundance biomass with annual rates −3.1% (0.95 CI [−5.3, −1]) –4.9% [−9.4, −1.6]), respectively. Non‐linear closely related SPEI when considering climatic water balance six years showed severe between 2015 2022 (−71% 0.95 [−84, −61] / −89% [−97, −59]). However, there remained background‐decline −2.1% [−5.7, −0.2]) [−6.5, −0.1]), respectively, which occurred independently drought. observed negative metrics shift assemblage that less directly droughts. Declining drought‐sensitive tended be larger predators low dispersal abilities. This study among very first investigate current drought insects central Europe. Our findings add concerning amount evidence while pointing towards weather anomalies as important driver.

Language: Английский

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Differential sampling in the assessment of conservation and biodiversity merit: a comparison of the seagrass macrofauna in three nearby South African estuaries

Biodiversity and Conservation, Journal Year: 2024, Volume and Issue: 33(2), P. 509 - 532

Published: Jan. 5, 2024

Abstract To what extent is the relative biodiversity of some flagship conservation sites a result differential attention? Knysna estuarine bay topmost ranked South African estuary for importance and biodiversity. It also one most intensively studied, hence sampling effort could partly be responsible its apparent richness. assess to which this might true, identical area, methodology were employed compare benthic macrofauna specific major habitat ( Zostera capensis seagrass beds) with equivalent ones in two nearby lesser-studied estuaries, Keurbooms/Bitou Swartvlei. Investigation showed all three localities share common species pool, but different elements it dominated shared type each. The adjacent sandflat macrobenthos proved just as biodiverse unprotected Protected Area Knysna, that Swartvlei (also Area) was impoverished comparison, presumably consequent on mouth closure prevailing lower salinity. Despite marked geomorphological hydrological differences, estuaries suite unusual faunal such particularly close similarity suggests historical biogeographic processes. analysis emphasises need caution when assessing or other merits individual systems data-limited environment.

Language: Английский

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