Trends and mechanisms behind the invasion of Coilia brachygnathus (Actinopterygii, Engraulidae) in one of the world’s largest reservoirs

Liao, Chuansong; Yu, Jixin; Wang, Jiacheng; Correa, Sandra Bibiana; Xiong, Fei; Zhai, Dongdong; Ye, Shaowen; Liu, Jiashou

doi:10.1007/s10750-022-04896-8

Cited by 3 publications

(1 citation statement)

References 42 publications

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“…This system is a run‐of‐the‐river reservoir, and its largest affluent flow (i.e., water volume that flows into the reservoir per unit time) and lowest water residence time (i.e., the amount of time that water takes to flow out of the system) contribute to reducing the decoupling from riverine dynamics, most likely promoting more niche opportunities (Freedman et al, 2014; Santos et al, 2013). Contrasting the prevalence of detritivores in cascade reservoirs with algivores and carnivores in the channel reservoir indicates the importance of more feeding areas supported by higher riverine influence (Liao et al, 2023; Miranda et al, 2019). The higher species richness in the channel reservoir compared with the cascade reservoirs reinforces this possibility (Figure 3; Uehara et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Unraveling trait‐based fish community assembly in tropical reservoirs

Camara,

Araújo,

de Azevedo

et al. 2023

River Research & Apps

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Damming of large rivers has promoted well‐documented ecosystem changes that constitute critical threats to freshwater fish biodiversity. However, it is unclear how trait–environment relationships drive community assembly in older (>50 years) tropical river‐reservoir systems. We assessed physical features filtering functional traits (RLQ and fourth‐corner approaches) in seven tropical reservoirs along a major river, in southeastern Brazil, and correlated taxonomic and functional counterparts of local and beta diversity to assess niche‐based assembly processes under prevailing environmental conditions (null model approach). Lower littoral habitat availability (smaller area, volume, and riverine influence) favored species inhabiting open areas that feed on the bottom (mostly migratory species). Downstream position (lower elevation and inflow of water from the mainstem) allowed migrators to enter the reservoirs and promoted environmental heterogeneity, favoring detritivores, invertivores, and carnivorous generalists. Total blocking of the main channel excluded most migratory species from reservoirs at upstream reaches, whereas higher riverine influence and hydrological stability (larger area, volume, and water residence time) favored small‐sized sedentary species (omnivores and piscivores with parental care, mostly non‐native species) in the littoral zone. Correlations differing from null expectations for alpha diversity and nestedness revealed that niche‐based processes support species richness and loss under higher riverine influence and hydrological stability. Our study supports the importance of physical features to set functional spaces available for fish species, but random processes that boost taxonomic differences between reservoirs, largely related to non‐native species introductions, are the primary drivers of fish assemblage structure in tropical reservoirs long‐term disconnected from riverine dynamics.

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