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Differences in Adélie Penguin (Pygoscelis adeliae) Chick Growth Rates and Diet

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https://ir.library.oregonstate.edu/concern/articles/bz60cz26q

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  • Sexually size-dimorphic species must show some difference between the sexes in growth rate and/or length of growing period. Such differences in growth parameters can cause the sexes to be impacted by environmental variability in different ways, and understanding these differences allows a better understanding of patterns in productivity between individuals and populations. We investigated differences in growth rate and diet between male and female Adélie Penguin (Pygoscelis adeliae) chicks during two breeding seasons at Cape Crozier, Ross Island, Antarctica. Adélie Penguins are a slightly dimorphic species, with adult males averaging larger than adult females in mass (~11%) as well as bill (~8%) and flipper length (~3%). We measured mass and length of flipper, bill, tibiotarsus, and foot at 5-day intervals for 45 male and 40 female individually-marked chicks. Chick sex was molecularly determined from feathers. We used linear mixed effects models to estimate daily growth rate as a function of chick sex, while controlling for hatching order, brood size, year, and potential variation in breeding quality between pairs of parents. Accounting for season and hatching order, male chicks gained mass an average of 15.6 g d⁻¹ faster than females. Similarly, growth in bill length was faster for males, and the calculated bill size difference at fledging was similar to that observed in adults. There was no evidence for sex-based differences in growth of other morphological features. Adélie diet at Ross Island is composed almost entirely of two species—one krill (Euphausia crystallorophias) and one fish (Pleuragramma antarctica), with fish having a higher caloric value. Using isotopic analyses of feather samples, we also determined that male chicks were fed a higher proportion of fish than female chicks. The related differences in provisioning and growth rates of male and female offspring provides a greater understanding of the ways in which ecological factors may impact the two sexes differently.
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  • Jennings, S., Varsani, A., Dugger, K. M., Ballard, G., & Ainley, D. G. (2016). Sex-Based Differences in Adélie Penguin (Pygoscelis adeliae) Chick Growth Rates and Diet. PLoS ONE, 11(3), e0149090. doi:10.1371/journal.pone.0149090
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  • 11
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  • 3
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  • Logistic support was supplied by Oregon State University, Point Blue Conservation Science, and the U.S. Antarctic Program, with field work and support for DGA funded by National Science Foundation grant ANT-0944411. SJ received additional support from Oregon State University, Fisheries and Wildlife Department (M. A. Ali Graduate Chair Award in Fisheries Biology). DGA is employed by a commercial company, H.T. Harvey and Associates. This funder provided support in the form of salaries for authors [DGA], using the funds from NSF, but did not have any additional role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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