Influence of Temperature, Salinity, and Weight on the Oxygen Consumption of a Laboratory Population of Americamysis bahia (Mysidacea)

1997 ◽  
Vol 17 (1) ◽  
pp. 21 ◽  
Author(s):  
Richard F. Modlin ◽  
Adrienne J. Froelich
Keyword(s):  
Oxygen Consumption ◽  
Laboratory Population ◽  
Influence Of Temperature

Adaptations of Coleoptera to the marine environment. II. Observations on rove beetles (Staphylinidae) from rocky shores

1988 ◽  
Vol 66 (11) ◽  
pp. 2469-2474 ◽  
Author(s):  
Werner Topp ◽  
Richard A. Ring
Keyword(s):  
Oxygen Consumption ◽  
Spring Tide ◽  
Salinity Range ◽  
Laboratory Population ◽  
Rocky Shores ◽  
Temperature Dependent ◽  
Rove Beetles ◽  
Dry Conditions ◽  
Lethal Time ◽  
Rate Of Evaporation

Two common rove beetles inhabit the intertidal rocky shores of British Columbia: Liparocephalus cordicollis Le Conte and Diaulota densissima Casey. Liparocephalus cordicollis, the more abundant of the two, is a predator that feeds preferentially on small chironomid larvae. Adults and larvae of this species can withstand submergence in seawater at 10 °C for more than 2 weeks. Thus they are able to survive continuous inundation from one spring tide to the next, just above lowest tide levels. Adults of L. cordicollis are osmotic regulators and can stabilize their body weight at salinities varying from 2 to 45‰. Both of these staphylinid species respire above and below water. Oxygen consumption of L. cordicollis in air at 10 °C was 376 ± 59 μL O2∙g−1∙h−1, but when the beetles were immersed in seawater at the same temperature the respiration rate was reduced to 45 ± 8 μL O2∙g−1∙h−1. During submersion, temperature-dependent reactions were observed (Q10 = 2). Respiration was constant within the salinity range of 2–30‰, but at higher levels (45‰) oxygen consumption increased to 55 ± 5 μL∙g−1∙h−1. When L. cordicollis was exposed to warm, dry conditions (simulating low tide on a warm summer day) the rate of evaporation from the cuticle was very high, calculated at 175 μg H2O loss per cm2 body surface per hour per mm Hg saturation deficit. The LT50 (mean lethal time) for a laboratory population was 2.5 h at a vapor pressure deficit of 7 mm Hg. In the larvae of beetles of the two species, asynchrony of growth in the population occurs because submerged larvae stop feeding and growing. Consequently, the development of individuals living near the low tide line is protracted compared with that of individuals living in the midlittoral zone.

INFLUENCE OF TEMPERATURE AND DURATION OF CONDITIONING ON OXYGEN CONSUMPTION AND SPECIFIC GRAVITY OF THE HAEMOLYMPH OF ANAGASTA (EPHESTIA) KÜHNIELLA (ZELL.) (LEPIDOPTERA:PYRALIDIDAE)

1960 ◽  
Vol 38 (1) ◽  
pp. 143-148 ◽  
Author(s):  
A. S. Atwal
Keyword(s):  
Oxygen Consumption ◽  
Specific Gravity ◽  
Thermal Acclimation ◽  
Extreme Temperatures ◽  
Influence Of Temperature ◽  
Rate Of Oxygen Consumption ◽  
Ephestia Kühniella

Acclimation in Anagasta kühniella pupae within the range of normal temperatures was not associated with changes in the rate of oxygen consumption or specific gravity of the haemolymph. Only when the pupae were conditioned at the extreme temperatures of 5 °C and 35 °C for about 16 and 8 hours, respectively, did their haemolymph become more concentrated. This was not due to desiccation. Thus the theory of osmoregulation does not explain the phenomenon of thermal acclimation satisfactorily.

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