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Title: Experimentally increased temperature and hypoxia affect stability of social hierarchy and metabolism of the Amazonian cichlid Apistogramma agassizii
Authors: Kochhann, Daiani
Campos, Derek Felipe de
Val, Adalberto Luis
Keywords: Aerobic Metabolism
Animals Experiment
Apistogramma Agassizii
Controlled Study
Electron Transport
Environmental Change
Environmental Temperature
Feeding Behavior
High Temperature
Resting Metabolic Rate
Social Behavior
Social Dominance
Social Interaction
Social Status
Adverse Effects
Behavior, Animals
Basal Metabolic Rate
Biological Model
Comparative Study
Energy Metabolism
Environmental Illness
Fish Diseases
Stress, Physiological
Fish Protein
Multienzyme Complex
Basal Metabolism
Behavior, Animals
Electron Transport Chain Complex Proteins
Energy Metabolism
Environmental Illness
Feeding Behavior
Fish Diseases
Fish Proteins
Hierarchy, Social
Hot Temperature
Models, Biological
Random Allocation
Stress, Physiological
Issue Date: 2015
metadata.dc.publisher.journal: Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology
metadata.dc.relation.ispartof: Volume 190, Pags. 54-60
Abstract: The primary goal of this study was to understand how changes in temperature and oxygen could influence social behaviour and aerobic metabolism of the Amazonian dwarf cichlid Apistogramma agassizii. Social hierarchies were established over a period of 96h by observing the social interactions, feeding behaviour and shelter use in groups of four males. In the experimental environment, temperature was increased to 29°C in the high-temperature treatment, and oxygen lowered to 1.0mg·L-1O2 in the hypoxia treatment. Fish were maintained at this condition for 96h. The control was maintained at 26°C and 6.6mg·L-1O2. After the experimental exposure, metabolism was measured as routine metabolic rate (RMR) and electron transport system (ETS) activity. There was a reduction in hierarchy stability at high-temperature. Aggression changed after environmental changes. Dominant and subdominant fish at high temperatures increased their biting, compared with control-dominant. In contrast, hypoxia-dominant fish decreased their aggressive acts compared with all other fish. Shelter use decreased in control and hypoxic dominant fish. Dominant fish from undisturbed environments eat more than their subordinates. There was a decrease of RMR in fish exposed to the hypoxic environment when compared with control or high-temperature fish, independent of social position. Control-dominant fish had higher RMR than their subordinates. ETS activity increased in fish exposed to high temperatures; however, there was no effect on social rank. Our study reinforces the importance of environmental changes for the maintenance of hierarchies and their characteristics and highlights that most of the changes occur in the dominant position. © 2015 Elsevier Inc.
metadata.dc.identifier.doi: 10.1016/j.cbpa.2015.09.006
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