Integrated Physiological Biomarkers Responses in Wild Fish Exposed to the Anthropogenic Gradient in the Biobío River, South-Central Chile

Quiroz-Jara, Mauricio; Casini, Silvia; Fossi, María Cristina; Orrego, Rodrigo; Gavilán, J. F.; Barra, Ricardo

doi:10.1007/s00267-021-01465-y

Cited by 6 publications

(1 citation statement)

References 38 publications

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“…As a consequence, deterioration of water quality and biodiversity has been registered during last decades (e.g., endocrine disruption, presence of toxic metabolites in fish, etc.) [33,36,41]. Furthermore, the Biobío River is currently fragmented by 18 hydropower dams and is projected for further rapid hydropower development with up to 158 dams in 2050 [31].…”

Section: Study Areamentioning

confidence: 99%

Taxonomic and Functional Responses of Species-Poor Riverine Fish Assemblages to the Interplay of Human-Induced Stressors

Colin

Habit

Manosalva

et al. 2022

Water

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The effects of human-induced stressors on riverine fish assemblages are still poorly understood, especially in species-poor assemblages such as those of temperate South American rivers. In this study we evaluated the effects of human-induced stressors on the taxonomic and functional facets of fish assemblages of two central-southern Chilean rivers: the Biobío River (flow regulated by multiple dams) and the Valdivia River (free-flowing). The study design considered reference condition, urban polluted, and urban-industrial polluted sites. To evaluate the effects of stressors on fish assemblages we assessed: (i) components of beta diversity; (ii) spatial and temporal patterns of fish structure using a multivariate approach; and (iii) functional diversity (specialization, originality, dispersion, and entropy) using linear models. We found a strong association between taxonomic and functional fish assemblage facets with a predominance of natural processes in the Valdivia River reflected in marked temporal dynamics. In contrast, the Biobío River showed a clear loss of association with seasonal pattern, and both taxonomic and functional facets appeared to respond significantly to pollution zones. Implementation of stricter environmental policies and integrated river basin management are instrumental for conserving species-poor fish assemblages in Chilean temperate rivers characterized by low functional traits redundancy.

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