scholarly journals Physiological adaptations to high intertidal life involve improved water conservation abilities and metabolic rate depression in Littorina saxatilis

2001 ◽  
Vol 224 ◽  
pp. 171-186 ◽  
Author(s):  
IM Sokolova ◽  
HO Pörtner
Keyword(s):  
Metabolic Rate ◽  
Water Conservation ◽  
Littorina Saxatilis ◽  
Metabolic Rate Depression ◽  
Physiological Adaptations

scholarly journals The benefit of being still: energy savings during winter dormancy in fish come from inactivity and the cold, not from metabolic rate depression

2018 ◽  
Vol 285 (1886) ◽  
pp. 20181593 ◽  
Author(s):  
Ben Speers-Roesch ◽  
Tommy Norin ◽  
William R. Driedzic
Keyword(s):  
Metabolic Rate ◽  
Fish Species ◽  
Energy Savings ◽  
Thermal Sensitivity ◽  
Resting Metabolic Rate ◽  
Winter Dormancy ◽  
Metabolic Rate Depression ◽  
Spontaneous Movement ◽  
Anoxic Waters ◽  
Physico Chemical

Winter dormancy is used by many animals to survive the cold and food-poor high-latitude winter. Metabolic rate depression, an active downregulation of resting cellular energy turnover and thus standard (resting) metabolic rate (SMR), is a unifying strategy underlying the persistence of organisms in such energy-limited environments, including hibernating endotherms. However, controversy exists about its involvement in winter-dormant aquatic ectotherms. To address this debate, we conducted simultaneous, multi-day measurements of whole-animal oxygen consumption rate (a proxy of metabolic rate) and spontaneous movement in a model winter-dormant marine fish, the cunner ( Tautogolabrus adspersus ). Winter dormancy in cunner involved a dampened diel rhythm of metabolic rate, such that a low and stable metabolic rate persisted throughout the 24 h day. Based on the thermal sensitivity ( Q 10 ) of SMR as well as correlations of metabolic rate and movement, the reductions in metabolic rate were not attributable to metabolic rate depression, but rather to reduced activity under the cold and darkness typical of the winter refuge among substrate. Previous reports of metabolic rate depression in cunner, and possibly other fish species, during winter dormancy were probably confounded by variation in activity. Unlike hibernating endotherms, and excepting the few fish species that overwinter in anoxic waters, winter dormancy in fishes, as exemplified by cunner, need not involve metabolic rate depression. Rather, energy savings come from inactivity combined with passive physico-chemical effects of the cold on SMR, demonstrating that thermal effects on activity can greatly influence temperature–metabolism relationships, and illustrating the benefit of simply being still in energy-limited environments.

Metabolic rate depression in animals: transcriptional and translational controls

2004 ◽  
Vol 79 (1) ◽  
pp. 207-233 ◽  
Author(s):  
Kenneth B. Storey ◽  
Janet M. Storey
Keyword(s):  
Metabolic Rate ◽  
Metabolic Rate Depression

The regulation of AMPK signaling in a natural state of profound metabolic rate depression

2009 ◽  
Vol 335 (1-2) ◽  
pp. 91-105 ◽  
Author(s):  
Christopher J. Ramnanan ◽  
David C. McMullen ◽  
Amy G. Groom ◽  
Kenneth B. Storey
Keyword(s):  
Metabolic Rate ◽  
Natural State ◽  
Metabolic Rate Depression ◽  
Ampk Signaling

Key Molecular Regulators of Metabolic Rate Depression in the Estivating Snail Otala Lactea

2021 ◽  
pp. 275-302
Author(s):  
Christopher J. Ramnanan ◽  
Ryan A. Bell ◽  
John-Douglas Matthew Hughes
Keyword(s):  
Metabolic Rate ◽  
Metabolic Rate Depression ◽  
Otala Lactea

The Physiology and Energetics of Bat Flight

1972 ◽  
Vol 57 (2) ◽  
pp. 317-335 ◽  
Author(s):  
STEVEN P. THOMAS ◽  
RODERICK A. SUTHERS
Keyword(s):  
Metabolic Rate ◽  
Metabolic Cost ◽  
Minute Volume ◽  
High Metabolic Rate ◽  
Abrupt Increase ◽  
Bird Flight ◽  
Terrestrial Mammals ◽  
Oxygen Capacity ◽  
Physiological Adaptations ◽  
Phyllostomus Hastatus

1. The energetics and physiological responses to flight of the echolocating bat Phyllostomus hastatus were studied to determine the energy requirements and physiological adaptations for mammalian flight. 2. The metabolic cost of bat flight is approximately comparable to that of bird flight and requires a metabolic rate appreciably greater than has been reported for terrestrial mammals during exercise. During flight P. hastatus consumed between 24.7 and 29.1 ml O2 (g h)-1, which is about four times its metabolic rate immediately prior to flight and more than 30 times its oxygen consumption while resting with a TR of 36.5 °C in a small chamber. 3. The onset of flight is accompanied by an abrupt increase in both the heart rate, from about 8.7 to 13 beats/sec, and the respiratory rate, from 3 to about 9.6/sec. Rectal temperature is elevated during flight and maintained at about 41.8 °C. The respiratory quotient, which averages 0.83 in a quietly resting bat, rises to a little over 1.0 during the first few minutes of flight. 4. The minimum estimated tidal volume during flight is about 1.4 ml. One respiratory cycle occurs with each wingbeat, corresponding to an estimated minute volume of 840 ml, which is comparable to that reported for the flying budgerigar. The amount of oxygen extracted by P. hastatus from a given volume of tidal air is also comparable to the efficiency of ventilation reported for this bird. 5. High hematocrit values of about 60%, and a high oxygen capacity of 27.5 vol % of P. hastatus blood, must represent important adaptations for enabling the flying bat to maintain such a high metabolic rate.

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