Impacts of Urbanization on Stream Fish Assemblages: The Role of the Species Pool and the Local Environment

Czeglédi, István; Kern, Bernadett; Tóth, Rita; Seress, Gábor; Erős, Tibor

doi:10.3389/fevo.2020.00137

Cited by 18 publications

(5 citation statements)

References 61 publications

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“…The advantage of running a PCA on the original environmental data prior to further analysis is that it reduces the number of variables to a small number of largely independent (orthogonal) explanatory variables (here environmental gradients, see e.g. [42][43][44]). The component scores of the waterbodies along the most influential first two principal components in both the physical habitat structure and chemical PCAs were used as explanatory variables in further analyses (forward selection and variance partitioning, see below).…”

Section: Data Analysesmentioning

confidence: 99%

eDNA metabarcoding reveals the role of habitat specialization and spatial and environmental variability in shaping diversity patterns of fish metacommunities

Erős,

Funk,

Pont

et al. 2024

PLoS ONE

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Information is scarce on how environmental and dispersal processes interact with biological features of the organisms, such as their habitat affinity, to influence patterns in biodiversity. We examined the role of habitat specialist vs. generalist species, and the spatial configuration, connectivity, and different environmental characteristics of river-floodplain habitats to get a more mechanistic understanding of alpha and beta diversity of fish metacommunities. We used environmental DNA metabarcoding to characterize species (taxa) richness and composition in two separate floodplains of the river Danube (Austria and Hungary) during two different hydrological conditions. Results showed that differences in the number of generalist and specialist species and their responses to connectivity and environmental gradients influenced patterns in alpha and beta diversity. Of the components of beta diversity, richness difference (nestedness) showed consistently higher values than replacement (turnover), mainly due to the decrease of specialist species along the connectivity gradient (i.e., from the mainstem to the most isolated oxbows). Variance in both alpha and beta diversity could be well predicted by a set of local and regional variables, despite high environmental variability, which characterizes river-floodplain ecosystems. Of these, the joint or shared variance fractions proved to be the most important, which indicates that the effects of local and regional processes cannot be unambiguously separated in these river-floodplain systems. Local scale environmental variables were more important determinants of both alpha and beta diversity in the low water period than in the high water period. These results indicate the differential role of local and regional processes in community organization during different hydrological conditions. Maintenance of both local and regional scale processes are thus important in the preservation of alpha and beta diversity of floodplain fish metacommunities, which should be considered by environmental management.

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Section: Data Analysesmentioning

confidence: 99%

eDNA metabarcoding reveals the role of habitat specialization and spatial and environmental variability in shaping diversity patterns of fish metacommunities

Erős,

Funk,

Pont

et al. 2024

PLoS ONE

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“…Most of the records on P. parva in Croatia are known from regularly-monitored larger rivers and lakes (Boršić et al 2018), but knowledge of its distribution in numerous lowland streams and canals is sparse and limited (Delić 1993, Mustafić et al 2020), whereas environmental factors associated with the occurrence of this species remains unknown. Environmental factors that shape fish communities (including the occurrence of each species) differ between regions (Wang et al 2006, Bierschenk et al 2019, Czeglédi et al 2020). Thus, we hypothesised that the occurrence of P. parva is associated with a set of specific environmental predictors in lowland waterbodies of the River Sava basin in Croatia.…”

Section: Introductionmentioning

confidence: 99%

Occurrence of topmouth gudgeon, Pseudorasbora parva, in relation to environmental factors in lowland streams and canals

Špelić

Piria

2023

Journal of Vertebrate Biology

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“…In urban areas, streams are often confined in channels covered with impervious concrete surfaces. Combined with the alteration of the riparian zone, these modifications result in channel simplification and homogenized habitat structure (Czeglédi et al, 2020). These effects cause important environmental deterioration, which strongly influences biodiversity (Gál et al, 2019;Tóth et al, 2019), for example, altering trophic food webs and triggering the loss of aquatic species (Fierro et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

A century of anthropogenic river alterations in a highly diverse river coastal basin: Effects on fish assemblages

Moraga

Vivancos²,

Ruiz³

et al. 2022

Front. Environ. Sci.

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The global increase in human population is driving a continuous conversion of land to anthropogenic uses. This is a major threat to lotic ecosystems worldwide, as it compromises the biotic integrity and health of rivers and streams. Studies in the northern hemisphere have shown that the effects of urbanization on fish assemblages include decrease and/or loss of diversity and abundance of native species, and a proliferation of tolerant exotic species. Such effects have not been widely studied in developing countries like Chile, where urbanization has impacted several river ecosystems. Over decades, the lower zone of the Andalién River in Central Chile has gone over intense non-planned urbanization stemming from the city of Concepción, leading to several physical alterations. The native fish and lamprey fauna of this coastal river basin has been reported as very diverse, with a total of 16 native species. However, this fauna has been affected by multiple effects of different land uses and direct alterations in the riverbed. To study how these fish and lamprey assemblages have changed, this paper compiles records from 1919 to 2018 and analyzes them in relation to the direct and indirect anthropogenic alterations in the basin. The results show a significant reduction in richness and abundance of native species, with only nine species currently. The two migratory lampreys, one of them endemic (Mordacia lapicida), have been extirpated from the Andalién River basin. Conversely, the richness and distribution of introduced species has increased throughout the river basin. The invasive species Gambusia holbrooki, first registered in 1999, is currently the most abundant in the urban zone of the river. Although the more substantial direct alterations of the riverbed occurred in the lower areas, a steeper reduction in native species richness occurred in the middle areas subjected to a long history of agricultural and forestry land use. We suggest the loss of resilience of the river ecosystem, and that the collapse of biodiversity in this river system demonstrates the lack of urban planning and the inefficiency of environmental regulations in protecting native species and ecosystems with high conservation value in Chile.

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Impacts of Urbanization on Stream Fish Assemblages: The Role of the Species Pool and the Local Environment

Cited by 18 publications

References 61 publications

eDNA metabarcoding reveals the role of habitat specialization and spatial and environmental variability in shaping diversity patterns of fish metacommunities

eDNA metabarcoding reveals the role of habitat specialization and spatial and environmental variability in shaping diversity patterns of fish metacommunities

Occurrence of topmouth gudgeon, Pseudorasbora parva, in relation to environmental factors in lowland streams and canals

A century of anthropogenic river alterations in a highly diverse river coastal basin: Effects on fish assemblages

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