Examinando por Autor "Manríquez, Patricio H."
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Ítem Artificial Light at Night (ALAN) causes size-dependent effects on intertidal fish decision-making(Elsevier, 2023-08) Pulgar, José; Manríquez, Patricio H.; Widdicombe, Stephen; García-Huidobro, Roberto; Quijón, Pedro A.; Carter, Mauricio; Aldana, Marcela; Quintanilla-Ahumada, Diego; Duarte, CristianArtificial Light at Night (ALAN) alters cycles of day and night, potentially modifying species' behavior. We assessed whether exposure to ALAN influences decision-making (directional swimming) in an intertidal rockfish (Girella laevisifrons) from the Southeastern Pacific. Using a Y-maze, we examined if exposure to ALAN or natural day/night conditions for one week affected the number of visits and time spent in three Y-maze compartments: dark and lit arms (“safe” and “risky” conditions, respectively) and a neutral “non-decision” area. The results showed that fish maintained in natural day/night conditions visited and spent more time in the dark arm, regardless of size. Instead, fish exposed to ALAN visited and spent more time in the non-decision area and their response was size-dependent. Hence, prior ALAN exposure seemed to disorient or reduce the ability of rock fish to choose dark conditions, deemed the safest for small fish facing predators or other potential threats. © 2023 Elsevier Ltd.Ítem Species-specific responses to ocean acidification should account for local adaptation and adaptive plasticity(Nature Publishing Group, 2017-03) Vargas, Cristian A.; Lagos, Nelson A.; Lardies, Marco A.; Duarte, Cristian; Manríquez, Patricio H.; Aguilera, Victor M.; Broitman, Bernardo; Widdicombe, Steve; Dupont, SamGlobal stressors, such as ocean acidification, constitute a rapidly emerging and significant problem for marine organisms, ecosystem functioning and services. The coastal ecosystems of the Humboldt Current System (HCS) off Chile harbour a broad physical-chemical latitudinal and temporal gradient with considerable patchiness in local oceanographic conditions. This heterogeneity may, in turn, modulate the specific tolerances of organisms to climate stress in species with populations distributed along this environmental gradient. Negative response ratios are observed in species models (mussels, gastropods and planktonic copepods) exposed to changes in the partial pressure of CO 2 (pCO2) far from the average and extreme pCO2 levels experienced in their native habitats. This variability in response between populations reveals the potential role of local adaptation and/or adaptive phenotypic plasticity in increasing resilience of species to environmental change. The growing use of standard ocean acidification scenarios and treatment levels in experimental protocols brings with it a danger that inter-population differences are confounded by the varying environmental conditions naturally experienced by different populations. Here, we propose the use of a simple index taking into account the natural pCO2 variability, for a better interpretation of the potential consequences of ocean acidification on species inhabiting variable coastal ecosystems. Using scenarios that take into account the natural variability will allow understanding of the limits to plasticity across organismal traits, populations and species. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.