Juvenile American shad Alosa sapidissima were subjected to isothermal transfers into sea water (salinity 24) ‘early’ (1 September; 24 C) and ‘late’ (10 November; 10 C) in the autumn migratory season. Early acclimation resulted in a modest osmotic perturbation that recovered rapidly. Haematocrit declined by 14% at 24 h, recovering within 48 h. Plasma osmolality increased by 6% at 4 h, recovering...

Thermotolerance and heat acclimation are key adaptation processes that have been hitherto viewed as separate phenomena. Here, we provide evidence that these processes may share a common basis, as both may potentially be governed by the heat shock response. We evaluated the effects of a heat shock response-inhibitor (quercetin; 2,000 mg/day) on established markers of thermotolerance [gastrointes...

Relict leopard frog (Rana [Lithobates] onca) tadpoles were obtained shortly after hatching at Gosner stage 25 and raised in aquaria maintained at 15, 20, 25, 30 and 35°C. Development was arrested in the 15°C group, and survivorship declined to 64% after 191 days. However, 80% of the surviving larvae remained alive after the temperature was increased to 25°C. Of these, 96% reached metamorphosis....

cold tolerance is an adaptative mechanism that plants in temperate climates require to survive and grow in suboptimal temperatures.  exposed plant to low temperature produces a myriad of measurable changes in biochemical characters that are often highly correlated with plant cold tolerance.  a key element of cereal adaptation to cold is represented by the capacity for physiological adjustments ...

ABA, a phytohormone, regulates many agronomically important aspects of plant growth and development, including seed maturation, dormancy and stress tolerance (Finkelstein et al. 2002). During vegetative growth, endogenous ABA levels increase upon conditions of water stress, and ABA acts as an essential mediator in triggering the plant response to these adverse environmental stresses (Finkelstei...

Plant photosynthesis and respiration are the largest carbon fluxes between the terrestrial biosphere and the atmosphere1, and their parameterizations represent large sources of uncertainty in projections of land carbon uptake in Earth system models2,3 (ESMs). The incorporation of temperature acclimationof photosynthesis and foliar respiration, commonly observed processes, into ESMs has been pro...

Seasonal cooling can modify the thermal preferenda of ectothermic vertebrates and elicit a variety of physiological responses ranging from winter dormancy to an acclimation response that partially compensates for the effects of low temperature on activity. Partial compensation of activity levels is particularly common in aquatic species for which seasonal temperature changes provide a stable cu...

Acclimation is the capacity to adapt environmental changes within lifetime of an individual. This ability allows plants cope with continuous variation in ambient conditions which they are exposed as sessile organisms. Because and extremes becoming even more pronounced due current period climate change, enhancing efficacy plant acclimation a promising strategy for mitigating consequences global ...