| bone lead levels and lead isotope ratios in red grouse from scottish and yorkshire moors. | leg and foot bones of adult and juvenile red grouse (lagopus lagopus scoticus) were collected from hunter-shot birds on two scottish estates (glendye and invermark) and one yorkshire estate in september, 2003. the lead content of bones was measured by atomic absorption spectrophotometry, and corresponding stable lead isotopes (pb(204, 206, 207, 208)) by inductively coupled plasma mass spectrometry. at the glendye (n=111) and invermark (n=85) estates, relatively few birds (5.4% and 3.5%, respecti ... | 2009 | 19264349 |
| testing the interactive effects of testosterone and parasites on carotenoid-based ornamentation in a wild bird. | testosterone underlies the expression of most secondary sexual traits, playing a key role in sexual selection. however, high levels might be associated with physiological costs, such as immunosuppression. immunostimulant carotenoids underpin the expression of many red-yellow ornaments, but are regulated by testosterone and constrained by parasites. we manipulated testosterone and nematode burdens in red grouse (lagopus lagopus scoticus) in two populations to tease apart their effects on caroteno ... | 2010 | 20536879 |
| can acaricide-impregnated leg bands fitted to female red grouse reduce sheep tick parasitization of chicks and increase chick survival? | in parts of northern england, north wales and the scottish highlands, increasing numbers of sheep ticks ixodes ricinus (ixodida: ixodidae), and the louping ill virus they can carry, are considered to be important factors that reduce red grouse lagopus lagopus scotica productivity. the present study tested this hypothesis by fitting adult female grouse with leg bands impregnated with the acaricide cypermethrin to experimentally control ticks on their chicks on two managed grouse moors in northeas ... | 2016 | 27377883 |