Invasive Rainbow Trout (Oncorhynchus mykiss) Are Not Affected by Different Land Uses in a Multi-Use, Mediterranean Climate Landscape

Lacy, Shaw Nozaki; Ugalde, Fernando; Mao, Luca

doi:10.3390/fishes3040037

Cited by 3 publications

(1 citation statement)

References 55 publications

(89 reference statements)

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“…Invasive species have been shown to influence native fish body size (Blanchet et al, 2010), which can have significant effects on SDM performance. In Chile, invasive species such as rainbow trout ( Oncorhynchus mykiss ) and brown trout ( Salmo trutta ) have strong impacts on fishes (Pardo, Vila & Capella, 2009; Arismendi et al, 2014) and may benefit from riparian vegetation conservation, especially in upland areas (Lacy, Ugalde & Mao, 2018). Regrettably, in the current study, we were unable to evaluate the effect of invasive species on body size.…”

Section: Discussionmentioning

confidence: 99%

Assessing the effect of fish size on species distribution model performance in southern Chilean rivers

Zamorano

Labra

Villarroel³

et al. 2019

PeerJ

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Despite its theoretical relationship, the effect of body size on the performance of species distribution models (SDM) has only been assessed in a few studies, and to date, the evidence shows unclear results. In this context, Chilean fishes provide an ideal case to evaluate this relationship due to their short size (fishes between 5 cm and 40 cm) and conservation status, providing evidence for species at the lower end of the worldwide fish size distribution and representing a relevant management tool for species conservation. We assessed the effect of body size on the performance of SDM in nine Chilean river fishes, considering the number of records, performance metrics, and predictor importance. The study was developed in the Bueno and Valdivia basins of southern Chile. We used a neural network modeling algorithm, training models with a cross-validation scheme. The effect of fish size on selected metrics was assessed using linear models and beta regressions. While no relationship between fish size and the number of presences was found, our results indicate that the model specificity increases with fish size. Additionally, the predictive importance of Riparian Vegetation and Within-Channel Structures variables decreases for larger species. Our results suggest that the relationship between the grain of the dataset and the home range of the species could bias SDM, leading in our case, to overprediction of absences. We also suggest that evolutionary adaptation to low slopes among Chilean fishes increases the relevance of riparian vegetation in the SDMs of smaller species. This study provides evidence on how species size may bias SDM, which could potentially be corrected by adjusting the model grain.

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Section: Discussionmentioning

confidence: 99%

Assessing the effect of fish size on species distribution model performance in southern Chilean rivers

Zamorano

Labra

Villarroel³

et al. 2019

PeerJ

Self Cite

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Geomorphic river classifications based on different methods coincide in predicting fish assemblage structure

Bañales‐Seguel,

Górski,

Zurita

et al. 2024

Earth Surf Processes Landf

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River classification is a necessary starting point for understanding river ecosystems and developing management guidelines. Using GIS to analyse an Andean river basin, we compare the application of two geomorphic classification methods at the segment scale: The Geomorphic Units Survey Classification System (GUS) and the Functional Process Zones (FPZ). Segment definition follows a manual procedure in GUS and a semi‐automated procedure in FPZ. Our objective was to assess the relationship between geomorphology and fish assemblages' structure. Fish sampling was carried out in collaboration with participants from local indigenous Mapuche‐Pewenche communities. Non‐parametric multivariate statistical analyses were conducted in order to quantify and describe geomorphic patterns and whether fish assemblages responded consistently with river classifications. Both classifications give insight into the physical characteristics of rivers, such as slope and floodplain width, that make habitat available for different fish assemblages. The two methods provide results that consistently coincide in their identification of geographic distribution and main geomorphic variables of different river types (geomorphic types) throughout the river network. The variation of different river geomorphologies was associated with variation in fish assemblage structure. Geomorphic variables that best characterize the distribution pattern of fish assemblages were elevation, confinement and valley floor width. Confined rivers accommodated highly similar fish assemblages dominated by invasive trout (Salmo trutta and Oncorhynchus mykiss). Unconfined rivers located at higher elevations had greater temporal variability and were mainly composed of trout and native catfish Trichomycterus areolatus. Semiconfined rivers presented the highest geomorphic variability and were associated with high spatial and temporal variability of fish assemblages characterized by both native and non‐native species. The association between fish assemblages and fluvial geomorphology could help in prioritizing rivers for exotic fish species control. These findings should aid in restoring highly intervened Andean rivers and improving management techniques in basins with a variety of human activities.

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Trait Composition and Assemblage Structure Analyses of Lacustrine Fishes: Synthesizing a Proposal for Better Fishing Practices

Díaz,

Habit,

Urrutia

et al. 2024

Water

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Fish provide ecosystem services and contribute to human well-being through fishing. In Chile, subsistence fishing provides food to local communities, whereas recreational fishing contributes to economic income via tourism. In the Lanalhue coastal lake basin, unregulated subsistence fishing and formal recreational fishing primarily target large fish species to ensure satisfactory catches and food provision. However, the development of unplanned fishing activities and lack of scientific knowledge can lead to socioecological conflicts and tension between users. To address this issue, this study focuses on improving fishing practices through the analysis of fish assemblages of the Lanalhue lake basin. The life cycle traits of each fish species were analyzed, as well as their abundance and biomass in each habitat. Twelve fish species were identified, and their distribution and abundance explain the differences in fish assemblage composition and structure among habitats. To promote better fishing practices, we propose four target species and specific management actions. These include defining fishing seasons, delineating fishing sites, and establishing fishing quotas. This approach, considering both community structure and functional aspects of fish assemblages, can serve as a valuable guide for developing sustainable fishing practices in the Lanalhue coastal lake basin.

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Invasive Rainbow Trout (Oncorhynchus mykiss) Are Not Affected by Different Land Uses in a Multi-Use, Mediterranean Climate Landscape

Cited by 3 publications

References 55 publications

Assessing the effect of fish size on species distribution model performance in southern Chilean rivers

Assessing the effect of fish size on species distribution model performance in southern Chilean rivers

Geomorphic river classifications based on different methods coincide in predicting fish assemblage structure

Trait Composition and Assemblage Structure Analyses of Lacustrine Fishes: Synthesizing a Proposal for Better Fishing Practices

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