Polar Biol (2017) 40:1493–1496 DOI 10.1007/s00300-017-2085-4 COMMENT Comment on population trends of southern rockhopper penguins (Eudyptes chrysocome chrysocome) on Isla Pingüino, Santa Cruz, Argentina Nina Dehnhard Received: 20 October 2016 / Revised: 27 December 2016 / Accepted: 17 January 2017 / Published online: 13 February 2017 © Springer-Verlag Berlin Heidelberg 2017 Gandini et al. (2016) recently published a paper showing chicks per breeding pair”. While mortality in chicks an exponential population increase of southern rockhop- during the late chick-rearing stage is low, breeding per penguins (Eudyptes chrysocome chrysocome; hereafter: failure during the incubation period is common (Raya SRP) on Isla Pingüino, Santa Cruz, Argentina (hereafter: Rey et al. 2007; Poisbleau et al. 2008). Birds that lose IP). Alongside population counts, reproductive success was both of their eggs during incubation will subsequently measured in some years, and the authors, furthermore, pre- leave the colony (personal observations) and will as a sent the numbers of tourists that visited the island each year matter of fact not be counted. As a consequence, repro- as a potential source of disturbance. ductive success as measured by Gandini et al. (2016) is The observed population increase is remarkable and likely overestimated and population numbers are likely worthy of publication, especially when
Polar Biology – Springer Journals
Published: Feb 13, 2017
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