An urban stream can support a healthy population of coastal cutthroat trout

Silver, Brook P.; Hudson, James M.; Smith, Christian T.; Lujan, Kenneth M.; Brown, Melissa J.; Whitesel, Timothy A.

doi:10.1007/s11252-017-0711-0

Cited by 3 publications

(2 citation statements)

References 56 publications

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“…In addition, urban landscapes are highly modified and undergo rapid human–urban expansion [ 76 , 81 , 82 , 83 ]. This expansion can greatly change the composition dynamics of species [ 84 , 85 ], as well as increase the connection of water bodies spread throughout urban environments [ 86 , 87 ], leading to more homogenization in species composition. Moreover, urban landscapes with fast-growing modifications are expected to be under climatic changes, such as drought stress, longer and drier periods with water shortage, and extremely hot weather conditions during summer time, with more frequent temperature extremes up to 100 °C [ 88 , 89 ].…”

Section: Discussionmentioning

confidence: 99%

Trait-Environment Relationships Reveal the Success of Alien Plants Invasiveness in an Urbanized Landscape

El-Barougy

Dakhil

Abdelaal

et al. 2021

Plants

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Urban areas are being affected by rapidly increasing human-made pressures that can strongly homogenize biodiversity, reduce habitat heterogeneity, and facilitate the invasion of alien species. One of the key concerns in invaded urban areas is comparing the trait–environment relationships between alien and native species, to determine the underlying causes of invasiveness. In the current study, we used a trait–environment dataset of 130 native plants and 33 alien plants, recorded in 100 plots covering 50 urban areas and 50 non-urban ones in an urbanization gradient in the arid mountainous Saint-Katherine protected area in Egypt. We measured eleven morphological plant traits for each plant species and ten environmental variables in each plot, including soil resources and human-made pressures, to construct trait–environment associations using a fourth-corner analysis. In addition, we measured the mean functional and phylogenetic distances between the two species groups along an urbanization gradient. Our results revealed strongly significant relationships of alien species traits with human-made pressures and soil resources in urban areas. However, in non-urban areas, alien species traits showed weak and non-significant associations with the environment. Simultaneously, native plants showed consistency in their trait–environment relationships in urban and non-urban areas. In line with these results, the functional and phylogenetic distances declined between the aliens and natives in urban areas, indicating biotic homogenization with increasing urbanization, and increased in non-urban areas, indicating greater divergence between the two species groups. Thereby, this study provided evidence that urbanization can reveal the plasticity of alien species and can also be the leading cause of homogenization in an arid urban area. Future urban studies should investigate the potential causes of taxonomic, genetic, and functional homogenization in species composition in formerly more diverse urbanized areas.

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Section: Discussionmentioning

confidence: 99%

Trait-Environment Relationships Reveal the Success of Alien Plants Invasiveness in an Urbanized Landscape

El-Barougy

Dakhil

Abdelaal

et al. 2021

Plants

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“…Despite their degraded conditions, many urban streams are home to threatened and endangered species (Morley & Karr 2002;Silver et al 2018), and effluent flows from WWTPs can supplement low base flow in rivers, expanding available habitats for native species in certain circumstances (Nedeau et al 2003). WWTP effluent output tends to elevate discharge year-round, with effluent flows comprising either a fraction or the entirety of the flow present, depending on the time of year (Goodrich et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Effects of urban spatial and temporal heterogeneity on benthic macroinvertebrate and diatom communities

Saffarinia¹,

Anderson²,

Palenscar³

2022

fal

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Water quality, distribution, and flow are often highly altered in rivers in urban watersheds, subjecting aquatic communities in the environment to novel spatial and temporal heterogeneity. An understanding of how novel spatial and temporal heterogeneity impacts aquatic communities is of paramount concern since these taxa are foundational to the urban food web. In this study, we documented the effects of flow perturbations on benthic macroinvertebrate and diatom communities relative to wastewater treatment plant outflows in a transect of an urbanized river in Southern California, USA. In particular, we analyzed trends in the richness and density of diatom and benthic macroinvertebrate communities in relation to novel flow heterogeneity introduced by wastewater treatment plants and urban storm runoff events. We found that diatom density decreased after a disturbance but quickly returned to its pre-disturbance levels, while the benthic macroinvertebrate community showed minimal shifts in composition and density after the disturbance, yet the sites had low richness of predominantly tolerant taxa. The locations of wastewater treatment plant outflows were found to exert a constant negative effect on density and richness in both communities. These results have implications for the conservation of endangered fish species in the urban Santa Ana River that depend on a thriving basal food web for survival.

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Genetic characteristics of coastal cutthroat trout inhabiting an urban watershed

2018

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An urban stream can support a healthy population of coastal cutthroat trout

Cited by 3 publications

References 56 publications

Trait-Environment Relationships Reveal the Success of Alien Plants Invasiveness in an Urbanized Landscape

Trait-Environment Relationships Reveal the Success of Alien Plants Invasiveness in an Urbanized Landscape

Effects of urban spatial and temporal heterogeneity on benthic macroinvertebrate and diatom communities

Genetic characteristics of coastal cutthroat trout inhabiting an urban watershed

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