166,339 research outputs found
J. William Swallow Oral History Interview
No full textOral history interview of J. William Swallow by Sandra Turner of the Millard High School History Club about life in rural Utah
Age-dependent health status and song characteristics in the barn swallow
No full textBird song has been hypothesized to evolve, partly, to signal health status of males, and song features should therefore correlate with parasite load. Immune function, parasitism, and secondary sexual characters can, however, differ between age classes, and any apparent relationship between song and parasite loads can be the result of systematic age effects. We tested for an age-dependent relationship between sexually selected characters and measures of parasitism in a Spanish population of the barn swallow Hirundo rustica. A comparison across age classes revealed that chewing lice load, song duration, mean peak amplitude frequency of songs, and tail length differed significantly between yearlings and adults. In a longitudinal analysis, we found significant evidence for mean peak amplitude frequency of songs, tail length and chewing louse parasitism, and a nonsignificant tendency for song duration to change with age of an individual. We found a significant association between song duration and chewing louse load and between hematocrit and peak amplitude frequency of the rattle, the typical harsh terminal syllable. In tests for associations between song traits and health status, while controlling for age, age and chewing louse load were independently related to song duration. We found a significant relationship between pairing success and song duration, implying that females may use this song trait in their choice of parasite-free males. Although the song of the barn swallow may provide information about both male age and parasite resistance, signaling of health status appears to be independent of age effects, in accordance with the theory of parasite-mediated sexual selection, suggesting that male signals can be used as reliable indicators of parasitism. Copyright 2005.age; barn swallow; bird song; chewing louse; hematocrit; sedimentation rate
RRS "Discovery" Cruise 34, 2-28 June 1970: Air-sea interaction observations near Weather Station 'J' ('JASIN') and trial moorings on the continental slope
No full textLow Variation in the Polymorphic Clock Gene Poly-Q Region Despite Population Genetic Structure across Barn Swallow (Hirundo rustica) Populations
No full textPubMed ID: 22216124This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
RRS "Discovery" Cruise 53, 1 April - 14 June 1973: Physical oceanography in the western North Atlantic Ocean (contribution to MODE-1)
No full textRRS "Discovery" Cruise 25, 25 January - 28 March 1969: Deep water formation in N.W. Mediterranean ('MEDOC 1969'). Trials and use of shipboard computer
No full textRRS "Discovery" Cruise 51, 4 November - 18 December 1972: Physical oceanography and geology N.E. Atlantic and N.W. Mediterranean
No full textRRS "Discovery" Cruise 49, 31 August - 2 October 1972: Air-sea interaction observations 'JASIN 1972'
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