The spatial and temporal repeatability of PHA-responses |
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| Authors: | Granbom Martin; Raberg Lars; Smith Henrik G |
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| Institution: | Department of Animal Ecology, Lund University, S-223 62 Lund, Sweden |
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| Abstract: | |
INTRODUCTION
| The capacity to mount a cell-mediated immune response in birdsis often quantified as the swelling following an injection ofphytohaemagglutinin (PHA) into the wing-web. Most studies havefound the repeatability of consecutive measurements of the sameswelling to be high (e.g., Alonso-Alvarez and Tella, 2001 ; Fargalloet al., 2002; Saino et al., 1997; Smits et al., 1999; Tellaet al., 2000). However, as pointed out by Siva-Jothy and Ryder(2001), repeatability calculated this way only estimates theprecision with which an experimenter measures the size of aparticular swelling; it does not encompass other componentsof measurement error. Furthermore, such estimates of repeatabilitydo not capture temporal variation in individuals' PHA-responses.To our knowledge, no study has reported the latter types
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