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A new analysis of hypoxia tolerance in fishes using a database of critical oxygen level (P-crit) 5
Rogers, Nicholas J.; Urbinalt, Mauricio A.; Reardon, Erin E.; Mckenzie, David J.; Wilsonl, Rod W..
Hypoxia is a common occurrence in aquatic habitats, and it is becoming an increasingly frequent and widespread environmental perturbation, primarily as the result of anthropogenic nutrient enrichment and climate change. An in-depth understanding of the hypoxia tolerance of fishes, and how this varies among individuals and species, is required to make accurate predictions of future ecological impacts and to provide better information for conservation and fisheries management. The critical oxygen level (P-crit)m has been widely used as a quantifiable trait of hypoxia tolerance. It is defined as the oxygen level below which the animal can no longer maintain a stable rate of oxygen uptake (oxyregulate) and uptake becomes dependent on ambient oxygen...
Tipo: Text Palavras-chave: Carbon dioxide; Critical oxygen tension; Metabolic rate; Oxygen and capacity limitation of thermal tolerance; Physiological trait.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00337/44816/74413.pdf
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Aggression supersedes individual oxygen demand to drive group air-breathing in a social catfish 5
Killen, Shaun S.; Esbaugh, Andrew J.; Martins, Nicolas F.; Rantin, F. Tadeu; Mckenzie, David J..
1. Group-living is widespread among animals and comes with numerous costs and benefits. To date, research examining group-living has focused on trade-offs surrounding foraging, while other forms of resource acquisition have been largely overlooked. 2. Air-breathing has evolved in many fish lineages, allowing animals to obtain oxygen in hypoxic aquatic environments. Breathing air increases the threat of predation, so some species perform group air-breathing, to reduce individual risk. Within species, individual air-breathing can be influenced by metabolic rate as well as personality, but the mechanisms of group air-breathing remain unexplored. It is conceivable that keystone individuals with high metabolic demand or intrinsic tendency to breathe air may...
Tipo: Text Palavras-chave: Air-breathing fish; Ecophysiology; Group-living; Keystone individuals; Metabolic rate; Social behaviour.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00417/52831/78979.pdf
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In modelling effects of global warming, invalid assumptions lead to unrealistic projections 5
Lefevre, Sjannie; Mckenzie, David J.; Nilsson, Goeran E..
Tipo: Text Palavras-chave: Climate change; Fish; Growth; Metabolism; Modelling; Oxygen uptake; Scaling; Warming.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00426/53762/54697.pdf
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Models projecting the fate of fish populations under climate change need to be based on valid physiological mechanisms 5
Lefevre, Sjannie; Mckenzie, David J.; Nilsson, Goran E..
Some recent modelling papers projecting smaller fish sizes and catches in a warmer future are based on erroneous assumptions regarding (i) the scaling of gills with body mass and (ii) the energetic cost of 'maintenance'. Assumption (i) posits that insurmountable geometric constraints prevent respiratory surface areas from growing as fast as body volume. It is argued that these constraints explain allometric scaling of energy metabolism, whereby larger fishes have relatively lower mass-specific metabolic rates. Assumption (ii) concludes that when fishes reach a certain size, basal oxygen demands will not be met, because of assumption (i). We here demonstrate unequivocally, by applying accepted physiological principles with reference to the existing...
Tipo: Text Palavras-chave: Aerobic scope; Gill surface area; Growth; Metabolism; Oxygen consumption; Respiration; Scaling.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00395/50621/51449.pdf
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The role of the autonomic nervous system in control of cardiac and air-breathing responses to sustained aerobic exercise in the African sharptooth catfish Clarias gariepinus 5
Blasco, Felipe R.; Mckenzie, David J.; Taylor, Edwin W.; Rantin, F. Tadeu.
Clarias gariepinus is a facultative air-breathing catfish that exhibits changes in heart rate (f(H)) associated with air breaths (AB). A transient bradycardia prior to the AB is followed by sustained tachycardia during breath-hold. This study evaluated air-breathing and cardiac responses to sustained aerobic exercise in juveniles (total length similar to 20 cm), and how exercise influenced variations in f(H) associated with AB. In particular, it investigated the role of adrenergic and cholinergic control in cardiac responses, and effects of pharmacological abolition of this control on air-breathing responses. Sustained exercise at 15, 30 and 45 cm s(-1) in a swim tunnel caused significant increases in f(AB) and f(H), from approximately 5 breaths h(-1) and...
Tipo: Text Palavras-chave: Adrenergic tone; Cholinergic tone; Heart rate; Swimming.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00367/47821/74728.pdf
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