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Provedor de dados:  ArchiMer
País:  France
Título:  Reflex cardioventilatory responses to hypoxia in the flathead gray mullet (Mugil cephalus) and their behavioral modulation by perceived threat of predation and water turbidity
Autores:  Shingles, A
Mckenzie, David
Claireaux, Guy
Domenici, P
Data:  2005-09
Ano:  2005
Palavras-chave:  Oxygen
Channel Catfish
Neotropical Fish
Cardiorespiratory Reflexes
Air Breathing Fish
Tambaqui Colossoma Macropomum
Salmon Oncorhynchus Tshawytscha
Aquatic Surface Respiration
Resumo:  In hypoxia, gray mullet surface to ventilate well-oxygenated water in contact with air, an adaptive response known as aquatic surface respiration (ASR). Reflex control of ASR and its behavioral modulation by perceived threat of aerial predation and turbid water were studied on mullet in a partly sheltered aquarium with free surface access. Injections of sodium cyanide (NaCN) into either the bloodstream ( internal) or ventilatory water stream ( external) revealed that ASR, hypoxic bradycardia, and branchial hyperventilation were stimulated by chemoreceptors sensitive to both systemic and water O-2 levels. Sight of a model avian predator elicited bradycardia and hypoventilation, a fear response that inhibited reflex hyperventilation following external NaCN. The time lag to initiation of ASR following NaCN increased, but response intensity ( number of events, time at the surface) was unchanged. Mullet, however, modified their behavior to surface under shelter or near the aquarium edges. Turbid water abolished the fear response and effects of the predator on gill ventilation and timing of ASR following external NaCN, presumably because of reduced visibility. However, in turbidity, mullet consistently performed ASR under shelter or near the aquarium edges. These adaptive modulations of ASR behavior would allow mullet to retain advantages of the chemoreflex when threatened by avian predators or when unable to perceive potential threats in turbidity.
Tipo:  Text
Idioma:  Inglês

Editor:  University of Chicago Press
Formato:  application/pdf
Fonte:  Physiological and Biochemical Zoology (1522-2152) (University of Chicago Press), 2005-09 , Vol. 78 , N. 5 , P. 744-755
Direitos:  2005, The University of Chicago

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