...Gabriela M. Quinlan; Christina M. Grozinger ABSTRACT In temperate climates, honey bees show strong phenotypic plasticity associated with seasonal changes. In summer, worker bees typically only survive for about a month and can be further classified as young nurse bees (which feed the developing...

...Michael W. Country; Kristina Haase; Katrin Blank; Carlos R. Canez; Joshua A. Roberts; Benjamin F. N. Campbell; Jeffrey C. Smith; Andrew E. Pelling; Michael G. Jonz ABSTRACT Seasonal modifications in the structure of cellular membranes occur as an adaptive measure to withstand exposure to prolonged...

...Catherine A. Dayger; Deborah I. Lutterschmidt ABSTRACT As in many vertebrates, hormonal responses to stress vary seasonally in red-sided garter snakes ( Thamnophis sirtalis parietalis ). For example, males generally exhibit reduced glucocorticoid responses to a standard stressor during the spring...

.... Furthermore, we asked to what extent features of activity/rest rhythm of flies are conserved across species under changing environmental conditions encountered across seasons, and to do so, we studied two more drosophilid species. We found that while each species exhibits seasonality in activity patterns...

... in terrestrial decapods. As many terrestrial decapods experience opposing seasonal demands upon ionoregulatory physiologies, we reasoned that these would make interesting models in which to study the effect of CHH upon these phenomena. In particular, those (tropical) species that also undergo seasonal migrations...

...Christopher Turbill; Thomas Ruf; Thomas Mang; Walter Arnold Red deer, Cervus elaphus , like other temperate-zone animals, show a large seasonal fluctuation in energy intake and expenditure. Many seasonal phenotypic adjustments are coordinated by endogenous signals entrained to the photoperiod...

...Kent D. Dunlap; Ana C. Silva; Michael Chung SUMMARY Environmental complexity and season both influence brain cell proliferation in adult vertebrates, but their relative importance and interaction have not been directly assessed. We examined brain cell proliferation during both the breeding and non...

...C. Stawski; F. Geiser SUMMARY Seasonal changes in weather and food availability differ vastly between temperate and subtropical climates, yet knowledge on how free-ranging subtropical insectivorous bats cope with such changes is limited. We quantified ambient temperatures, torpor patterns...

...A. M. Petersen; T. T. Gleeson SUMMARY We characterized carbohydrate metabolism following activity in the American bullfrog, Rana catesbeiana , and compared whole body metabolic profiles between two seasons. Forty-eight adult male Rana catesbeiana were chronically cannulated and injected with[U- 14...

...-mail: [email protected] ) 27 8 2003 © The Company of Biologists Limited 2003 2003 green turtle Chelonia mydas metabolism heart rate enzyme activity temperature season Green turtles ( Chelonia mydas ) are distributed circumglobally in coastal habitats such as reefs, lagoons...

... was larger than the first. This potentiation was seasonal: it was present from November through June, and absent from July through October. Potentiation was not affected by the geographic origin of the clams, nor by their acclimation temperature. Potentiation was inhibited by the nitric oxide synthase (NOS...

...Carrie A. Beck; W. Don Bowen; Sara J. Iverson ABSTRACT Phocid seals go through dramatic seasonal changes in body mass and composition as a result of the spatial and temporal separation of foraging, reproduction and moulting. These changes in body fat content and body mass result in seasonal changes...

...T. Mark Olsen; Sandra J. Sass; Ning Li; John G. Duman ABSTRACT The insects and microarthropods that vary seasonally in susceptibility to cross-cuticular inoculation by external ice (inoculative freezing) represent a phylogenetically diverse group; however, few studies have explored possible...

...+ entering a frog remains in Ca 2+ -rich layers of the skin, with ventral skin containing about three times as much Ca 2+ as dorsal skin. There are seasonal rhythms in Ca 2+ exchange: although Ca 2+ influx does not vary significantly over the year, efflux is minimal in July, while net flux, which is negative...

... red blood cells cod Gadus morhua season Protons are passively distributed across the membrane of mammalian red blood cells according to a Donnan equilibrium and any change in the extracellular pH (pHe) affects the intracellular compartment ( Hladky and Rink, 1977 ). The intracellular pH...

.... The mean values varied considerably from day to day but were generally low, often with a large DIDS-induced H + efflux. Fig. 8. (A) The seasonal rhythm of maximal transport capacity for isoproterenol-stimulated Na + /H + exchange in trout erythrocytes. The filled circles represent values obtained...