Effects of feeding on thermoregulatory behaviours and gut blood flow in white sturgeon (<i>Acipenser transmontanus</i>) using biotelemetry in combination with standard techniques

Gräns, Albin; Olsson, Caroline; Pitsillides, Koullis; Nelson, Haley; Cech, J. J.; Axelsson, Michael

doi:10.1242/jeb.043570

Cited by 32 publications

(36 citation statements)

References 52 publications

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“…However, the general validity of the final thermal preferendum paradigm has been challenged by a large number of experimental studies showing that temperature selection can be influenced by factors such as acclimation [12], [13], sex [14], intra- and inter-specific interactions [15], [16], and feeding [10], [17], [18]. Polymorphism could also favour the appearance of different thermoregulatory behaviours within populations, as shown in polymorphic insects for colour patterns [19].…”

Section: Introductionmentioning

confidence: 99%

Behavioural Thermoregulatory Tactics in Lacustrine Brook Charr, Salvelinus fontinalis

et al. 2011

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The need to vary body temperature to optimize physiological processes can lead to thermoregulatory behaviours, particularly in ectotherms. Despite some evidence of within-population phenotypic variation in thermal behaviour, the occurrence of alternative tactics of this behaviour is rarely explicitly considered when studying natural populations. The main objective of this study was to determine whether different thermal tactics exist among individuals of the same population. We studied the behavioural thermoregulation of 33 adult brook charr in a stratified lake using thermo-sensitive radio transmitters that measured hourly individual temperature over one month. The observed behavioural thermoregulatory patterns were consistent between years and suggest the existence of four tactics: two “warm” tactics with both crepuscular and finer periodicities, with or without a diel periodicity, and two “cool” tactics, with or without a diel periodicity. Telemetry data support the above findings by showing that the different tactics are associated with different patterns of diel horizontal movements. Taken together, our results show a clear spatio-temporal segregation of individuals displaying different tactics, suggesting a reduction of niche overlap. To our knowledge, this is the first study showing the presence of behavioural thermoregulatory tactics in a vertebrate.

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Section: Introductionmentioning

confidence: 99%

Behavioural Thermoregulatory Tactics in Lacustrine Brook Charr, Salvelinus fontinalis

et al. 2011

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“…On the basis of the present findings, it could be speculated that this may be even more crucial for euryhaline fish acclimated to seawater. Thus, to further investigate these possibilities, future studies should record postprandial metabolic and circulatory responses of freely swimming and voluntarily feeding fish acclimated to different salinities using novel techniques such as blood flow biotelemetry (19,20).…”

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confidence: 99%

Cardiorespiratory upregulation during seawater acclimation in rainbow trout: effects on gastrointestinal perfusion and postprandial responses

Brijs

Gräns

Ekström

et al. 2016

American Journal of Physiology-Regulatory, Integrative and Comp

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“…An explanation for the extended elevated MO 2 is that the latter component of the SDA response is largely attributed to the postabsorptive processes of meal assimilation, including protein and glycogen synthesis (reviewed by [33]. In support, the infusion of amino acids into the bloodstream of the catfish, Ictalurus punctatus , increased metabolic rate, a response that was abolished by the administration of the protein synthesis inhibitor cycloheximide [34], [35].…”

Section: Discussionmentioning

confidence: 99%

Effects of Hypoxic Exposure during Feeding on SDA and Postprandial Cardiovascular Physiology in the Atlantic Cod, Gadus morhua

et al. 2012

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Some Atlantic cod in the Bornholm Basin undertake vertical foraging migrations into severely hypoxic bottom water. Hypoxic conditions can reduce the postprandial increase in gastrointestinal blood flow (GBF). This could subsequently postpone or reduce the postprandial increase in oxygen consumption (MO2), i.e. the SDA, leading to a disturbed digestion. Additionally, a restricted oxygen uptake could result in an oxygen debt that needs to be compensated for upon return to normoxic waters and this may also affect the ability to process the food. Long-term cardio-respiratory measurements were made on fed G. morhua in order to understand how the cardio-respiratory system of feeding fish respond to a period of hypoxia and a subsequent return to normoxia. These were exposed to 35% water oxygen saturation for 90 minutes, equivalent to the time and oxygen level cod voluntarily endure when searching for food in the Bornholm Basin. We found that i) gastric and intestinal blood flows, cardiac output and MO2 increased after feeding, ii) gastric and intestinal blood flows were spared in hypoxia, and iii) there were no indications of an oxygen debt at the end of the hypoxic period. The magnitude and time course of the measured variables are similar to values obtained from fish not exposed to the hypoxic period. In conclusion, when cod in the field search for and ingest prey under moderate hypoxic conditions they appear to stay within safe limits of oxygen availability as we saw no indications of an oxygen debt, or negative influence on digestive capacity, when simulating field observations.

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Effects of feeding on thermoregulatory behaviours and gut blood flow in white sturgeon (Acipenser transmontanus) using biotelemetry in combination with standard techniques

Cited by 32 publications

References 52 publications

Behavioural Thermoregulatory Tactics in Lacustrine Brook Charr, Salvelinus fontinalis

Behavioural Thermoregulatory Tactics in Lacustrine Brook Charr, Salvelinus fontinalis

Cardiorespiratory upregulation during seawater acclimation in rainbow trout: effects on gastrointestinal perfusion and postprandial responses

Effects of Hypoxic Exposure during Feeding on SDA and Postprandial Cardiovascular Physiology in the Atlantic Cod, Gadus morhua

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