The Ecological Role of Roadside Stormwater Ponds - Potential to Support Biodiversity
Doctoral thesis, 2020
The results of this thesis indicate that larger ponds are better for supporting aquatic biodiversity due to a more heterogeneous environment and the ability to dilute pollutants. Also, the presence of other ponds in the vicinity of the stormwater ponds can facilitate the movement of invertebrates between ponds through increased connectivity. An apparent negative effect of pollution levels on the macroinvertebrate community composition was observed, but not on the biodiversity measured as the number of taxa or Shannon index. The analyses based on the datasets identified using both morphology and DNA metabarcoding demonstrated that DNA metabarcoding captured and identified more than twice the number of taxa compared to morphological identification. Application of DNA metabarcoding greatly increases the number of species identified at each sampling site, thereby providing more accurate information regarding the way the ponds function and how they are affected by management. Subsequently, the differences in the macroinvertebrate community composition between different types of ponds were compared at the regional and global scale. The results indicated that environmental characteristics, especially conductivity and pH, were different between different types of ponds. Alpha and gamma diversity were similar or even higher in manmade ponds compared to natural ponds due to very different macroinvertebrate communities. Moreover, generally ponds exhibited high levels of spatial heterogeneity, which subsequently enhances gamma diversity.
In summary, stormwater ponds have the potential to provide suitable habitats to foster biodiversity. When such systems are created, larger ponds should be built to provide more heterogeneous habitat and dilute harmful pollutants. Additional ponds should also be created in the vicinity of the ponds, thereby promoting aquatic biodiversity through higher connectivity. Although stormwater ponds accumulate pollutants due to their primary functions, this pollution retention process creates a unique environment within the stormwater ponds, which are more suitable for taxa that are moderately to strongly tolerant to pollutants and that may not be found in natural ponds. In this way, stormwater ponds constitute an option in the areas along the highway so that they could combine water treatment properties with providing a suitable habitat for aquatic organisms.
Macroinvertebrates
Stormwater ponds
DNA metabarcoding
Sediments
High throughput sequencing
Road runoff
Water quality
Aquatic biodiversity
Author
Zhenhua Sun
Chalmers, Architecture and Civil Engineering, Water Environment Technology
Impact of environmental factors on aquatic biodiversity in roadside stormwater ponds
Scientific Reports,;Vol. 9(2019)
Journal article
DNA metabarcoding adds valuable information for management of biodiversity in roadside stormwater ponds
Ecology and Evolution,;Vol. 9(2019)p. 9712-9722
Journal article
Aquatic biodiversity in sedimentation ponds receiving road runoff – What are the key drivers?
Science of the Total Environment,;Vol. 610(2018)p. 1527-1535
Journal article
A comparative study of macroinvertebrate biodiversity in highway stormwater ponds and natural ponds
Science of the Total Environment,;Vol. 740(2020)
Journal article
Sun, Z., et al. Macroinvertebrate diversity and environmental characteristics: global comparison of manmade and natural ponds in different types of landscapes. Manuscript in preparation.
Subject Categories
Water Engineering
Ecology
Environmental Sciences
ISBN
978-91-7905-288-1