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Torsten Nygaard Kristensen
Aalborg University
189Publications
40H-index
5,554Citations
Publications 193
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#2Volker Loeschcke (AU: Aarhus University)H-Index: 52
Last.Jonas Mengel-From (University of Southern Denmark)H-Index: 12
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Environmental stresses such as extreme temperatures, dehydration and food deprivation may have distinct consequences for different age-classes and for males and females across species. Here we investigate a natural population of the model organism Drosophila melanogaster. Males and females at ages 3, 19 and 35 days were tested for stress resistance; i.e. the ability of flies to cope with starvation and both cold and hot temperatures. Further, we tested a measure of metabolic efficiency, namely m...
4 CitationsSource
#1Heidi J. MacLean (AU: Aarhus University)H-Index: 8
#2Johannes Overgaard (AU: Aarhus University)H-Index: 37
Last.Jesper Givskov Sørensen (AU: Aarhus University)H-Index: 2
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Abstract Ectotherms can use microclimatic variation and behavioral thermoregulation to cope with unfavorable environmental temperatures. However, relatively little is known about how and if thermoregulatory behavior is used across life stages in small ectothermic insects. Here we investigate differences between three specialized Drosophila species from temperate, tropical or desert habitats and one cosmopolitan species by estimating the preferred temperature (Tpref) and the breadth (Tbreadth) of...
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#1Mathias Hamann Sørensen (AAU: Aalborg University)H-Index: 1
#2Torsten Nygaard Kristensen (AAU: Aalborg University)H-Index: 40
Last.Simon Bahrndorff (AAU: Aalborg University)H-Index: 13
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The ability to cope with increasing and more variable temperatures, due to predicted climate changes, through plastic and/or evolutionary responses will be crucial for the persistence of Arctic spe...
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#1Lucy Rebecca Davies (AU: Aarhus University)H-Index: 1
#2Mads Fristrup Schou (AU: Aarhus University)H-Index: 12
Last.Volker Loeschcke (AU: Aarhus University)H-Index: 52
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Abstract Insects are known to selectively balance their intake of protein and carbohydrate to optimize reproduction and survival. For insects who feed on decomposing fruit, fluctuations in macronutrient composition occur as fruits ripe and decomposition progresses which may challenge optimal resource allocation. Using Drosophila melanogaster, we tested the effect of macronutrient fluctuations and the variability of these fluctuations on starvation resistance and components of reproductive output...
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#1Palle Duun Rohde (Lundbeck)H-Index: 5
#2Iben Jensen (AAU: Aalborg University)H-Index: 7
Last.Torsten Nygaard Kristensen (AU: Aarhus University)H-Index: 40
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Knowledge of the genetic basis underlying variation in response to environmental exposures or treatments is important in many research areas. For example, knowing the set of causal genetic variants for drug responses could revolutionize personalized medicine. We used Drosophila melanogaster to investigate the genetic signature underlying behavioral variability in response to methylphenidate (MPH), a drug used in the treatment of attention-deficit/hyperactivity disorder. We exposed a wild-type D....
1 CitationsSource
#1Jakob SehestedH-Index: 17
#2C. GaillardH-Index: 7
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1 CitationsSource
#1Michael Ørsted (University of Melbourne)H-Index: 4
#2Ary A. Hoffmann (University of Melbourne)H-Index: 98
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The relationship between population size, inbreeding, loss of genetic variation and evolutionary potential of fitness traits is still unresolved, and large-scale empirical studies testing theoretical expectations are surprisingly scarce. Here we present a highly replicated experimental evolution setup with 120 lines of Drosophila melanogaster having experienced inbreeding caused by low population size for a variable number of generations. Genetic variation in inbred lines and in outbred control ...
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#1Mogens Vestergaard (AU: Aarhus University)H-Index: 27
#2K.F. JørgensenH-Index: 1
Last.Torsten Nygaard Kristensen (AU: Aarhus University)H-Index: 40
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Abstract When crossbreeding with beef breeds in organic dairy herds, the use of non-sexed semen will results in both male and female offspring to be used for beef production. The objective of the present study was to compare growth and carcass characteristics of 15 Danish Holstein bull (HB) calves, 15 beef x Danish Holstein crossbred bull (CB) calves and 15 beef x Danish Holstein crossbred heifer (CH) calves reared under organic settings. As beef bred sire a high-merit bull of the Limousine bree...
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#1Julie Cherono Schmidt Henriksen (AU: Aarhus University)H-Index: 1
#2Martin Riis Weisbjerg (AU: Aarhus University)H-Index: 11
Last.Lene Munksgaard (AU: Aarhus University)H-Index: 26
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ABSTRACT The aim of this study was to investigate the effects of a concentrate strategy based on the individual cow partial mixed ration (PMR) intake compared with a flat rate. Half of the cows were fed the individual concentrate strategy, whereas the other half were fed the control strategy. The individually fed cows were offered a concentrate proportion equal to 30% of the ad libitum intake of the PMR in the automatic milking system, and the control cows were offered 3 kg of concentrate/d in t...
1 CitationsSource
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