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Title of Journal: Behav Ecol Sociobiol

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Abbravation: Behavioral Ecology and Sociobiology

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Springer-Verlag

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DOI

10.1007/s10967-006-0294-3

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1432-0762

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Experimentally elevated plasma levels of testoster

Authors: Katharina Foerster Bart Kempenaers
Publish Date: 2004/06/22
Volume: 56, Issue: 5, Pages: 482-490
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Abstract

In temperate passerines increased testosterone T levels during breeding mediate male aggressive and mating behaviour If individual variability in T levels is reflected in behavioural differences during mating males with higher T might gain higher reproductive success This can be tested experimentally by elevating T levels However high exogenous T levels are known to have negative effects on male sperm production This may reduce male fitness particularly if sperm competition is intense We experimentally elevated T levels in breeding blue tit males to investigate how T levels above the natural mean influence male reproductive success Contrary to most—if not all—previous experimental manipulations of T levels in birds we restricted the treatment with exogenous T to the time when females were fertile and T levels were naturally high in males In blue tits extrapair paternity is an important component of male reproductive success and its frequency is likely influenced by androgenmediated behaviours such as mate attraction and aggression towards other males Here we show that Tmales were equally likely to become cuckolded and did not gain more extrapair paternity than control males Cuckolded Tmales however lost more paternity than control males We discuss the possibility that this is caused by negative effects of T treatment on sperm productionWe thank Anne Peters and three anonymous referees for comments that substantially improved the manuscript We are grateful to Kate Lessells for providing the GLIMmacro to perform the sexratio randomization tests to Cheryl Bishop Hansjörg Kunc Katharina Peer Angelika Pösel and Agnes Türk for help in the field and to Kim Carter and Sabrina Gaba for assistance with the molecular analyses RaphaelThomas Klumpp and Alfred Fojt from the Institute of Silviculture Vienna provided access to their facilities in the study area Hans Winkler from the Konrad Lorenz Institute for Comparative Ethology Vienna generously supported us during all stages of this study All applied procedures were approved by the Magistrate of Conservation in Vienna permit MA227332/97 and the Austrian Ministry of Science and Transport permit GZ 66015/10Pr/4/99


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  2. Honeybees use a Lévy flight search strategy and odour-mediated anemotaxis to relocate food sources
  3. Evolution of the fast start response in the cavefish Astyanax mexicanus
  4. Female oxidative status, egg antioxidant protection and eggshell pigmentation: a supplemental feeding experiment in great tits
  5. Secondary sex ratios do not support maternal manipulation: extensive data from laboratory colonies of spiny mice (Muridae: Acomys )
  6. Wildlife contact analysis: emerging methods, questions, and challenges
  7. Prior experience with eggs laid by non-nestmate queens induces egg acceptance errors in ant workers
  8. Ecological and hormonal correlates of antipredator behavior in adult Belding’s ground squirrels ( Spermophilus beldingi )
  9. Male spottail darters ( Etheostoma squamiceps ) do not use chemical or positional cues to discriminate between sired and foster eggs
  10. Parentally biased favouritism in relation to offspring sex in zebra finches
  11. Feeding and aggressive behaviours in juvenile coho salmon ( Oncorhynchus kisutch ) under chemically-mediated risk of predation
  12. Strategic exploitation in a socially parasitic bee: a benefit in waiting?
  13. Underwater and above-water search patterns of an Arctic seabird: reduced searching at small spatiotemporal scales
  14. Reproductive trade-offs from mating with a successful male: the case of the tephritid fly Anastrepha obliqua
  15. Heavier birds react faster to predators: individual differences in the detection of stalking and ambush predators
  16. Bright moonlight triggers natal dispersal departures
  17. Does leadership indicate male quality in Neoconocephalus katydids?
  18. Sexual selection favours small and symmetric males in the polygynous greater sac-winged bat Saccopteryx bilineata (Emballonuridae, Chiroptera)
  19. Condition dependence of male display coloration in a jumping spider ( Habronattus pyrrithrix )
  20. Chemical mimicry in an incipient leaf-cutting ant social parasite
  21. Queen acceptance and the complexity of nestmate discrimination in the Argentine ant
  22. Exaggerated orientation scatter of nocturnal passerine migrants close to breeding grounds: comparisons between seasons and latitudes
  23. Love bites: male fang use during coercive mating in wolf spiders
  24. Complex call in male rock hyrax ( Procavia capensis ): a multi-information distributing channel
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  26. Sperm competition and evidence of sperm fertilization patterns in the carrion ball-roller beetle Canthon cyanellus cyanellus LeConte (Scarabaeidae: Scarabaeinae)
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  28. Variable flight distance to resources results in changing sex allocation decisions, Megachile rotundata
  29. Hunted hunters? Effect of group size on predation risk and growth in the Australian subsocial crab spider Diaea ergandros
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  35. Preference for male traits in female wolf spiders varies with the choice of available males, female age and reproductive state
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  37. A field test of the Hamilton–Zuk hypothesis in the Trinidadian guppy ( Poecilia reticulata )
  38. Female philopatry and its social benefits among Bornean orangutans
  39. Older can be better: physiological costs of paternal investment in the Florida scrub-jay
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  44. Network structure and prevalence of Cryptosporidium in Belding’s ground squirrels
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