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Relationship between species richness,taxonomic distinctness,functional diversity,and local contribution toβdiversity and effects of habitat disturbance in the riparian spider community of the Ganga River,India

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Ecological Processes 2023年第1期12卷 204-216页

作者： Kritish De Amar Paul Singh Arkojyoti Sarkar Kritika Singh Manju Siliwal Virendra Prasad Uniyal Syed Ainul Hussain Wildlife Institute of India ChandrabaniDehradun 248001India Present Address:Department of Life Sciences Sri Sathya Sai University for Human ExcellenceNavanihalOkali PostKamalapurKalaburagiKarnataka 585313India

Background In the riverine riparian ecosystem,particularly in India,the knowledge of the effects of habitat disturbance on taxonomic distinctness,functional diversity,and local contribution toβdiversity(LCBD)of spider community is *** present study examined the relationships between the index of taxonomic distinctness(Δ^(+)),index of variation in taxonomic distinctness(λ^(+)),functional evenness(FEve),functional divergence(FDiv),functional dispersion(FDis),and LCBD of spider community of the Ganga River and the effects of habitat disturbance on these indices.A total of 27 sampling sites were selected along the bank of the Ganga *** on the rating of the disturbance scores,the sites were classified into lowly,moderately,and highly disturbed *** understand the relationships between species richness,Δ^(+),λ^(+),FDis,FDiv,FEve,LCBD,and habitat disturbance score,Pearson’s correlation was calculated,followed by the linear regression *** one-way multivariate analysis of variance was used to find differences in taxonomic distinctness and functional diversity in the different disturbed *** Significant relationships were found betweenλ^(+)andΔ^(+),FDis andΔ^(+),FDis andλ^(+),FDiv and species richness,FEve and species richness,FEve andλ^(+),FEve and habitat disturbance,LCBD and FEve,and LCBD and habitat disturbance.A significant difference was present in the indices of functional diversity between the lowly,moderately,and highly disturbed ***,garbage dump,human settlement,and created embankment influenced the spider community’sλ^(+),FEve,and *** Unrestrained anthropogenic activities exacerbate habitat disturbance by affecting ecological ***,understanding linkages between ecosystem disturbance,taxonomic,functional,andβdiversity can be fundamental to managing and conserving natural *** work highlights the importance of including taxonomic and functional diversity to comprehend the impact of habit

关键词： Habitat disturbance Taxonomic distinctness Functional evenness Functional divergence Functional dispersion Local contribution to beta diversity Spider community riparian area Ganga River

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Effects of Sand-Harvesting on River Water Quality and riparian Soil Physico-Chemical Properties

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Open Journal of Ecology 2022年第8期12卷 570-583页

作者： Aquila Isere Lwanga Harrison Mugatsia Tsingalia Humphrey Agevi Zablon Weku Shilenje Department of Biological Sciences Masinde Muliro University of Science and Technology Kakamega Kenya Department of Water Environment Natural Resources and Climate Change County Government of Kakamega Kakamega Kenya Department of Biological Sciences Jaramogi Oginga Odinga University of Science and Technology Bondo Kenya Department of Atmospheric Physics Charles University Prague Czech Republic

The widespread distribution of river sand-harvesting activities continues to degrade river water quality and the surrounding riverine environments. This study determined practical effects of sand-harvesting on two rivers in Kakamega County Kenya. Water samples were tested for turbidity and total suspended solids (TSS). For riparian soils, nitrogen (N), phosphorus (P), pH, organic carbon (OC), moisture content and textural class were determined on composite samples obtained from the field. Two control sites not affected by sand-harvesting were also used for comparison. Results indicate TSS concentrations increased during the rainy season when sand-harvesting was occurring, with significant differences between the control and sand-harvesting sample groups. Between seasons—dry and wet—in natural circumstances, the riparian soil moisture and phosphorus contents increased significantly. The study shows that river sand-harvesting degrades the aesthetic value of riparian areas, and makes rivers prone to bank erosion, and silt. This increases river water turbidity. The study concludes that sand-harvesting does not directly affect the riparian soil moisture content, total N, P, pH, OC or textural class, but reduces productivity of riparian land and puts the riverine ecosystems at risk.

关键词： River Ecosystem Conservation riparian area Kakamega River Lusumu River Shiastala

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Monitoring River Restoration Efforts: Do Invasive Alien Plants Endanger the Success? A Case Study of the Traisen River

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Journal of Environmental Protection 2016年第6期7卷 831-843页

作者： Katharina Lapin Karl-Georg Bernhardt Elisabeth Mayer Stefanie Roithmayr Joachim Neureiter Claudia Horvath Department of Integrative Biology and Biodiversity Research Institute of Botany University of Natural Resources and Life Sciences Vienna Austria

River restoration activities are challenging for the native vegetation and the colonization process. The development of invasive alien plant species (IAS) as well as the development of the pioneer vegetation cover and seed bank were observed in one year prior to construction of a new river bed and within the first two years after construction, along the downstream section of the river Traisen in Austria. One year after completion of the new river channel, the occurrence of IAS above ground decreased while the occurrence of target species increased. Furthermore, no seeds of IAS were detected in the new river bed as a result of proper management of soil movement. Despite the positive impact on the abundance of IAS, the restoration project of the river Traisen shows that the fact that such a restoration activity is a disturbance event must be taken into consideration already during the planning process. Supporting the competitiveness of native plant species is an important tool for reducing the danger of establishment of invasive alien species.

关键词： landscape management Invasive alien plant species vegetation river restoration succession riparian area seed bank

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