Reconstructing Historical Land Use and Anthropogenic Inputs in Lake Victoria Basin: Insights from PAH and n-Alkane Trends DOI Creative Commons

Camille Joy Enalbes,

Dennis M. Njagi, Chen Luo

et al.

Toxics, Journal Year: 2025, Volume and Issue: 13(2), P. 130 - 130

Published: Feb. 10, 2025

Over the past century, human activities have profoundly transformed global ecosystems. Lake Victoria in East Africa exemplifies these challenges, showcasing interplay of anthropogenic pressures driven by land use changes, urbanization, agriculture, and industrialization. Our comprehensive study investigates polycyclic aromatic hydrocarbons (PAHs) n-alkanes lake its catchment to trace their sources historical deposition. Sediment cores were collected from six sites within catchment, representing diverse landforms activities, ensuring a understanding basin. The results indicate significant spatial temporal variations both PAH n-alkane profiles, reflecting changes development trajectories Urban often exhibited higher concentrations PAHs short-chain n-alkanes, indicative such as fossil fuel combustion, input petroleum hydrocarbons, industrial emissions. In contrast, rural areas showed low levels dominance long-chain terrestrial plant waxes. ratios, including Carbon Preference Index Terrigenous–Aquatic Ratio, suggested shifts organic matter over time, corresponding with increased activities. A mid-20th century shift toward contributions was observed across sites, coinciding post-independence development. mid-lake sediment core integrated inputs multiple sub-catchments, providing record basin-scale changes. These findings highlight three distinct periods input: pre-1960s, dominated natural biogenic sources; 1960s–1990s, marked increasing influence; post-1990s, characterized complex mixtures pyrogenic, petrogenic, sources. This underscores cumulative environmental aquatic ecosystem effects urbanization (rural vs. urban sites), industrialization, century. combined analyses provide ongoing impacts, emphasizing need for management strategies that address pollutant preserve Victoria’s ecological integrity.

Language: Английский

The Newly Formed Ribb Reservoir Could Serve as a Refugia for Conserving Ethiopia's Globally Unique Labeobarbus Species Flock DOI Open Access
Abebe Getahun, Minwyelet Mingist, Bayuh Asmamaw Hailu

et al.

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2025, Volume and Issue: 35(2)

Published: Feb. 1, 2025

ABSTRACT The 17 species of Labeobarbus found in Lake Tana constitute the only extant cyprinid flock world but extensive water development projects are impacting their habitats. Here, we assess if spp. established above Ribb Dam, constructed 2017, and so, condition individuals there is evidence local recruitment. Fish samplings were conducted once a month during species' spawning season July to end September 2022, using monofilament multifilament gillnets at three locations upstream Dam. We collected 10 spp., with L. intermedius (40.7%) being most abundant followed by brevicephalus (23.0%) nedgia (22.2%). fork lengths ranged from 7.8 43.0 cm no notable gaps across size ranges. Fulton's factors for where n ≥ 20 1.30–1.54 (good), like populations. Our collection included sexually immature first‐time maturing individuals, indicating reproducing recruiting successfully watershed dam. results suggest that River Dam may serve as refugia least some flock. However, challenges remain before upper should be viewed viable long‐term habitat , including need fisheries management program, pollution control mitigation catchment degradation uplands leading rapid infilling reservoir, current estimates 30‐year reservoir life span.

Language: Английский

Citations

0
Quantifying Biodiversity's Present and Future: Current Potentials and SSP‐RCP‐Driven Land Use Impacts DOI Creative Commons
Yunxiang Cheng, Hong Liu, Jizeng Du

et al.

Earth s Future, Journal Year: 2025, Volume and Issue: 13(2)

Published: Feb. 1, 2025

Abstract Biodiversity, vital for ecosystem stability and human well‐being, faces threats from land use climate change. Accurately predicting these effects is crucial effective conservation. High emission development scenario commonly viewed as the most detrimental to biodiversity. However, recent researches suggest a more complex relationship between paths biodiversity outcomes. Our study addresses this by using an emergy‐based approach estimate current provincial‐level potential project future species richness losses (amphibians, mammals, birds) across zones provincial divisions under various SSP‐RCP scenarios 2030, 2050, 2070, 2090. The results revealed significant regional variations in China's potential, with highest southwestern provinces. Future trends indicate increased construction barren alongside decline grasslands, leading considerable habitat loss fragmentation scenarios, stressing conservation needs. follows Hu line zones, decreases south humid regions. Land‐use changes could reduce 1–6 per 10 km grid cell. High‐emission SSP585 do not necessarily have on different require targeted focus specific climatic These findings underscore that efforts regions sensitive loss. provides scientific foundation efforts, ensuring are prioritized scenarios. This aids developing strategies amidst interplay of dynamics

Language: Английский

Citations

0
Reconstructing Historical Land Use and Anthropogenic Inputs in Lake Victoria Basin: Insights from PAH and n-Alkane Trends DOI Creative Commons

Camille Joy Enalbes,

Dennis M. Njagi, Chen Luo

et al.

Toxics, Journal Year: 2025, Volume and Issue: 13(2), P. 130 - 130

Published: Feb. 10, 2025

Over the past century, human activities have profoundly transformed global ecosystems. Lake Victoria in East Africa exemplifies these challenges, showcasing interplay of anthropogenic pressures driven by land use changes, urbanization, agriculture, and industrialization. Our comprehensive study investigates polycyclic aromatic hydrocarbons (PAHs) n-alkanes lake its catchment to trace their sources historical deposition. Sediment cores were collected from six sites within catchment, representing diverse landforms activities, ensuring a understanding basin. The results indicate significant spatial temporal variations both PAH n-alkane profiles, reflecting changes development trajectories Urban often exhibited higher concentrations PAHs short-chain n-alkanes, indicative such as fossil fuel combustion, input petroleum hydrocarbons, industrial emissions. In contrast, rural areas showed low levels dominance long-chain terrestrial plant waxes. ratios, including Carbon Preference Index Terrigenous–Aquatic Ratio, suggested shifts organic matter over time, corresponding with increased activities. A mid-20th century shift toward contributions was observed across sites, coinciding post-independence development. mid-lake sediment core integrated inputs multiple sub-catchments, providing record basin-scale changes. These findings highlight three distinct periods input: pre-1960s, dominated natural biogenic sources; 1960s–1990s, marked increasing influence; post-1990s, characterized complex mixtures pyrogenic, petrogenic, sources. This underscores cumulative environmental aquatic ecosystem effects urbanization (rural vs. urban sites), industrialization, century. combined analyses provide ongoing impacts, emphasizing need for management strategies that address pollutant preserve Victoria’s ecological integrity.

Language: Английский

Citations

0