The Importance of Providing Multiple-Channel Sections in Dredging Activities to Improve Fish Habitat Environments

Chiu, Hung Pin; Suen, Jian Ping

doi:10.3390/w8020036

Cited by 3 publications

(3 citation statements)

References 51 publications

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“…Feeding patterns also have a certain impact on the habitat selection of fish [58]; thus, some small-size fish such as Microphysogobio chenhsienensis, Squalidus atromaculatus, and R. ocellatus prefer slow-flow habitat. For instance, secondary channels are usually separated by bars or stable island [59], which are good habitats for aquatic organisms [60,61]. Furthermore, more than 60% of fish species distributed in secondary channel, including 11 rare fish species, Cyprinus carpio, R. ocellatus, T. pulcher, Schistura incerta, Schistura fasciolata, Pseudorasbora parva, Mircrophysogobio chenhsienensis, S. atromaculatus, Parasinilabeo assimils, C. whiteheadi, and O. niloticus.…”

Section: Discussionmentioning

confidence: 99%

Correlation of Fish Assemblages with Habitat and Environmental Variables in a Headwater Stream Section of Lijiang River, China

Huang

et al. 2019

Sustainability

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In order to determine the relationship between stream habitat and fish assemblages, an investigation of fish assemblages and environmental variables in different habitat types was carried out in the headwater stream section of Lijiang River, China, from September to November 2016. In total, 2968 individuals belonging to 4 orders, 11 families, 26 genera and 37 species were collected. Cypriniformes emerged as the most species-rich order, accounting for 62.2% of the total species. The dominant species were Pseudogastromyzon fangi, Zacco platypus, Acrossocheilus parallens and Erromyzon sinensis. Non-metric multidimensional scaling (NMDS) and permutational multivariate analysis of variance (PERMANOVA) revealed that fish assemblages were not affected by habitat type. However, one-way ANOVA results showed that species richness, fish abundance, fish density and Shannon index were significantly affected by habitat type. Redundancy analysis (RDA) further revealed that altitude, velocity, conductivity, turbidity, depth and wetted width had significant relationships within fish assemblages, whereas water temperature, dissolved oxygen and substrate size were less important in this study, and different fish species preferred different environmental variables potentially due to differences in species’ ecological requirements. Although habitat type did not affect overall fish assemblages, habitat heterogeneity played an important role in fish diversity. Hence, maintaining diverse stream habitats or restoring them are of key importance for fish diversity conservation and sustainability management of rivers.

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Section: Discussionmentioning

confidence: 99%

Correlation of Fish Assemblages with Habitat and Environmental Variables in a Headwater Stream Section of Lijiang River, China

Huang

et al. 2019

Sustainability

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“…Providing multiple-channel sections in dredging activities could improve fish habitat environments [35]. The final contribution of this study is that we provide an integrated approach for applying engineering and biology to the context of future habitat restoration and projects involving river dredging after extreme flood events.…”

Section: Discussionmentioning

confidence: 99%

Intraspecific and Interspecific Variations in Habitat Usage by Hemimyzon formosanus and Sinogastromyzon nantaiensis in Riffle Areas of a Mountain Stream

Lu,

Suen

2023

Water

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In this study, we explored the structure of two migratory fish species and their variations along the longitudinal gradient of a stream by examining abiotic factors such as spatial scale elements and environmental factors, and biotic factors such as competition. The studied fish species, i.e., Hemimyzon formosanus and Sinogastromyzon nantaiensis, were sampled from the middle and upper reaches of the Nanzihsian Stream using the electrofishing technique, and data were collected on the physical environment covered by the electric grid. Statistical analyses confirmed that the interspecific and the intraspecific hydraulic habitat environments of the two species were different, i.e., H. formosanus was distributed relatively upstream and S. nantaiensis was distributed relatively downstream. Therefore, the habitat use of the two benthic fish species was different. The Nanzihsian Stream experienced an extreme flood event in 2009. The densities of adult and juvenile H. formosanus and S. nantaiensis are significantly higher than those before the extreme flood event in 2021, so we suggest that the H. formosanus and S. nantaiensis populations have recovered to those of the stages before the extreme flood event. We provide an integrated approach for applying engineering and biology to the context of future projects involving river dredging after extreme floods.

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“…One of the main consequences of constructing these small obstacles is the hydromorphological modification of stretches, affecting fish communities (Tobes et al, 2016a;Latli et al, 2019). Similarly, other habitat alterations as channelisation or dredging produce significant modifications on fish assemblages (Fischer et al, 2012;Reis, 2013;Chiu & Suen, 2016).…”

Section: Discussionmentioning

confidence: 99%

Evaluating the influence of environmental variables on fish assemblages along Tropical Andes: considerations from ecology to conservation

et al. 2021

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The lack of knowledge about freshwater biodiversity in remote areas like montane Andean rivers is noticeable and hinder the development of efficient conservation plans for aquatic ecosystems. Habitat requirements of tropical Andean fishes have been poorly analysed, despite the relevance of these ecological features on the fish conservation strategies. The present study aimed to examine fish assemblages along the altitudinal gradient in tropical Andean rivers and their relationship to habitat features to detect the most relevant abiotic factors and their implication on conservation. This study was conducted on a regional scale, along six basins located in tropical Andes (500 to 2,692 m a.s.l.). We studied fish diversity and distribution and their habitats along these elevation gradients. We found 6,320 specimens from 53 genera. Our analysis for the six most common and widely distributed genera (Astroblepus, Brycon, Bryconamericus, Chaetostoma, Pimelodella and Trichomycterus) underlines the relevance of hydromorphological variables on fish community structure in the Andean montane rivers, whereas human alterations seem to be less significant. These findings could be useful for current management and conservation strategies considering present threats over tropical montane rivers.

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The Importance of Providing Multiple-Channel Sections in Dredging Activities to Improve Fish Habitat Environments

Cited by 3 publications

References 51 publications

Correlation of Fish Assemblages with Habitat and Environmental Variables in a Headwater Stream Section of Lijiang River, China

Correlation of Fish Assemblages with Habitat and Environmental Variables in a Headwater Stream Section of Lijiang River, China

Intraspecific and Interspecific Variations in Habitat Usage by Hemimyzon formosanus and Sinogastromyzon nantaiensis in Riffle Areas of a Mountain Stream

Evaluating the influence of environmental variables on fish assemblages along Tropical Andes: considerations from ecology to conservation

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