Identifying effects of toe clipping on anuran return rates: the importance of statistical power Kirsten M. Parris 1,3 , Michael A. McCarthy 2,3 1 Australian Research Centre for Urban Ecology, Royal Botanic Gardens Melbourne, c/o School of Botany, University of Melbourne VIC 3010, Australia e-mail: email@example.com 2 School of Botany, University of Melbourne VIC 3010, Australia 3 National Center for Ecological Analysis and Synthesis, University of California Santa Barbara, 735 State Street, Santa Barbara CA 93101, USA e-mail: firstname.lastname@example.org Abstract. Toe clipping is a common method of marking anurans for population studies. We re-analysed data from four published studies investigating the relationship between return rate and number of toes clipped for three anuran species: Bufo fowleri , Crinia signifera and Hyla labialis . Although these studies claimed contradictory results, a re-analysis of the data with proper attention to statistical power demonstrated a statistically signi cant decline of 6-18% in the probability of return for each toe removed after the rst, in three of the four studies examined. The probability that the fourth study would detect a statistically signi cant effect of toe clipping was low unless the size of the effect was overwhelming. These results provide consistent
Amphibia-Reptilia – Brill
Published: Jan 1, 2001
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