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Author Benitez, S.; Duarte, C.; Opitz, T.; Lagos, N.A.; Pulgar, J.M.; Vargas, C.A.; Lardies, M.A.
Title Intertidal pool fish Girella laevifrons (Kyphosidae) shown strong physiological homeostasis but shy personality: The cost of living in hypercapnic habitats Type
Year 2017 Publication Marine Pollution Bulletin Abbreviated Journal Mar. Pollut. Bull.
Volume 118 Issue 1-2 Pages 57-63
Keywords Carbon dioxide; Hypercapnic conditions; Physiology; Behavior; Intertidal pool; Fish
Abstract Tide pools habitats are naturally exposed to a high degree of environmental variability. The consequences of living in these extreme habitats are not well established. In particular, little it is known about of the effects of hypercanic seawater (i.e. high pCO(2) levels) on marine vertebrates such as intertidal pool fish. The aim of this study was to evaluate the effects of increased pCO(2) on the physiology and behavior in juveniles of the intertidal pool fish Girella laevifrons. Two nominal pCO(2) concentrations (400 and 1600 patm) were used. We found that exposure to hypercapnic conditions did not affect oxygen consumption and absorption efficiency. However, the lateralization and boldness behavior was significantly disrupted in high pCO(2) conditions. In general, a predator-risk cost of boldness is assumed, thus the increased occurrence of shy personality in juvenile fishes may result in a change in the balance of this biological interaction, with significant ecological consequences. (C) 2017 Elsevier Ltd. All rights reserved.
Address [Benitez, S.; Lagos, N. A.] Univ Santo Tomos, Fac Ciencias, Ctr Invest & Innovat Cambia Climat CiiCC, Santiago, Chile, Email: cristian.duarte@unab.cl
Corporate Author (up) Thesis
Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0025-326x ISBN Medium
Area Expedition Conference
Notes WOS:000402217300020 Approved
Call Number UAI @ eduardo.moreno @ Serial 737
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Author Ramajo, L.; Fernandez, C.; Nunez, Y.; Caballero, P.; Lardies, M.A.; Poupin, M.J.
Title Physiological responses of juvenile Chilean scallops (Argopecten purpuratus) to isolated and combined environmental drivers of coastal upwelling Type
Year 2019 Publication Ices Journal Of Marine Science Abbreviated Journal ICES J. Mar. Sci.
Volume 76 Issue 6 Pages 1836-1849
Keywords environmental drivers; environmental heterogeneity; global change; metabolism; multi-stressor; physiology; tolerance; upwelling
Abstract Coastal biota is exposed to continuous environmental variability as a consequence of natural and anthropogenic processes. Responding to heterogeneous conditions requires the presence of physiological strategies to cope with the environment. Ecosystems influenced by upwelling endure naturally cold, acidic and hypoxic conditions, nevertheless they sustain major fisheries worldwide. This suggests that species inhabiting upwelling habitats possess physiological adaptations to handle high environmental variability. Here, we assessed the impact of the main upwelling drivers (temperature, pH and oxygen) in isolation and combined on eco-physiological responses of Chilean scallop Argopecten purpuratus. A. purpuratus responded to hypoxia by increasing their metabolic performance to maintain growth and calcification. Calcification was only affected by pH and increased under acidic conditions. Further, A. purpuratus juveniles prioritized calcification at the expense of growth under upwelling conditions. Increasing temperature had a significant impact by enhancing the physiological performance of A. purpuratus juveniles independently of oxygen and pH conditions, but this was associated with earlier and higher mortalities. Our results suggest that A. purpuratus is acclimated to short-term colder, acidic and hypoxic conditions, and provide important information of how this species responds to the heterogeneous environment of upwelling, which is significantly relevant in the climatic context of upwelling intensification.
Address [Ramajo, Laura; Fernandez, Carolina; Lardies, Marco A.] Univ Adolfo Ibanez, Fac Artes Liberales, Dept Ciencias, Ave Diagonal Las Torres 2640, Santiago, Chile, Email: laura.ramajo@ceaza.cl
Corporate Author (up) Thesis
Publisher Oxford Univ Press Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1054-3139 ISBN Medium
Area Expedition Conference
Notes WOS:000501732500040 Approved
Call Number UAI @ eduardo.moreno @ Serial 1068
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Author Jerez-Hanckes, C.; Pettersson, I.; Rybalko, V.
Title Derivation Of Cable Equation By Multiscale Analysis For A Model Of Myelinated Axons Type
Year 2020 Publication Discrete And Continuous Dynamical Systems-Series B Abbreviated Journal Discrete Contin. Dyn. Syst.-Ser. B
Volume 25 Issue 3 Pages 815-839
Keywords Hodgkin-Huxley model; nonlinear cable equation; cellular electrophysiology; multiscale modeling; homogenization
Abstract We derive a one-dimensional cable model for the electric potential propagation along an axon. Since the typical thickness of an axon is much smaller than its length, and the myelin sheath is distributed periodically along the neuron, we simplify the problem geometry to a thin cylinder with alternating myelinated and unmyelinated parts. Both the microstructure period and the cylinder thickness are assumed to be of order epsilon, a small positive parameter. Assuming a nonzero conductivity of the myelin sheath, we find a critical scaling with respect to epsilon which leads to the appearance of an additional potential in the homogenized nonlinear cable equation. This potential contains information about the geometry of the myelin sheath in the original three-dimensional model.
Address [Jerez-Hanckes, Carlos] Univ Adolfo Ibanez, Fac Engn & Sci, Diagonal Torres 2700, Santiago, Chile, Email: carlos.jerez@uai.cl;
Corporate Author (up) Thesis
Publisher Amer Inst Mathematical Sciences-Aims Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1531-3492 ISBN Medium
Area Expedition Conference
Notes WOS:000501609800001 Approved
Call Number UAI @ eduardo.moreno @ Serial 1069
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