Impact of short-term elevated temperature stress on winter-acclimated individuals of the marine gastropod Crepidula fornicata

The threat of predation, and the prey’s response, are important drivers of community dynamics. Yet environmental temperature can have a significant effect on predation avoidance techniques such as fast-start performance observed in marine fishes. While it is known that temperature increases can influence performance and behaviour in the short-term, little is known about how species respond to extended exposure during development. We produced a startle response in two species of damselfish, the lemon damselPomacentrus moluccensis,and the Ambon damselfishPomacentrus amboinensis,by the repeated use of a drop stimulus. We show that the length of thermal exposure of juveniles to elevated temperature significantly affects this escape responses.Short-term (4d) exposure to warmer temperature affected directionality and responsiveness for both species. After long-term (90d) exposure, onlyP. moluccensisshowed beneficial plasticity, with directionality returning to control levels. Responsiveness also decreased in both species, possibly to compensate for higher temperatures. There was no effect of temperature or length of exposure on latency to react, maximum swimming speed, or escape distance suggesting that the physical ability to escape was maintained. Evidence suggests that elevated temperature may impact some fish species through its effect on the behavioural responses while under threat rather than having a direct influence on their physical ability to perform an effective escape response.

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Elevated temperature stress strain behavior of beryllium powder product

10.2172/113965 ◽

1995 ◽

Author(s):

S.P. Abeln ◽

R. Field ◽

M.C. Mataya

Keyword(s):

Elevated Temperature ◽

Temperature Stress ◽

Stress Strain ◽

Strain Behavior ◽

Powder Product ◽

Beryllium Powder

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Physiological Changes and Yield Responses of Greengram (Vigna radiata L.)Under Elevated Temperature Stress

Madras Agricultural Journal ◽

10.29321/maj.2019.000269 ◽

2019 ◽

Vol 106 (4-6) ◽

Author(s):

B. Rakavi ◽

N. Sritharan ◽

A. Senthil ◽

S. Kokilavani ◽

S. Pannerselvam ◽

...

Keyword(s):

Elevated Temperature ◽

Temperature Stress ◽

Vigna Radiata ◽

Physiological Changes ◽

Yield Responses

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Three-Dimensional Numerical Analysis for Bolted Flange Joints Considering Effect of Creep

Volume 3A: Design and Analysis ◽

10.1115/pvp2018-85111 ◽

2018 ◽

Author(s):

Lewen Bi ◽

Lanzhu Zhang

Keyword(s):

High Temperature ◽

Elevated Temperature ◽

Numerical Analysis ◽

Yield Strength ◽

Room Temperature ◽

Three Dimensional ◽

Short Term ◽

Flange Connection ◽

Petroleum Chemical ◽

Bolted Flange

Bolted flange joints are widely used in petroleum, chemical, nuclear and power industries, etc. With more and more devices are used at high temperature, the performance of flange connections becomes more complex, especially with creep of different components in flange connection. At elevated temperature, with the loss of bolt force and gasket force due to creep, the joints are prone to leak. Based on this, this paper analyzed the relaxation of bolt force at elevated temperature due to creep of bolt, flange and gasket separately and simultaneously. Besides, the influence of different initial installation stress of bolts was also studied. The results showed bolted flange joints relaxed due to gasket creep during early short term service. However, contribution of bolt and flange creep became more and more significant with the extension of time. With considering the creep of bolt, flange and gasket simultaneously, 50% to 60% of the bolt material yield strength at room temperature was recommended as the bolt initial installation stress for the joint case studied in this paper.

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