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

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

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The article was published by the Public Library of Science and is in the public domain. The published article can be found at:  http://www.plosone.org/

Data Availability Statement: Data are available on the Harvard Dataverse:  http://dx.doi.org/10.7910/ DVN/LCVA3B.

Descriptions

Attribute NameValues
Alternative Title
  • Sex-Based Differences in Adelie Penguin (Pygoscelis adeliae) Chick Growth Rates and Diet
Creator
Abstract or Summary
  • 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.
Resource Type
DOI
Date Available
Date Issued
Citation
  • 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
Series
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2016-04-15T17:28:15Z No. of bitstreams: 2 license_rdf: 1089 bytes, checksum: 0a703d871bf062c5fdc7850b1496693b (MD5) JenningsSexBasedDifferences.PDF: 575983 bytes, checksum: 15aa2aeec9b60722348405bc669e6b3c (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-04-15T17:28:39Z (GMT) No. of bitstreams: 2 license_rdf: 1089 bytes, checksum: 0a703d871bf062c5fdc7850b1496693b (MD5) JenningsSexBasedDifferences.PDF: 575983 bytes, checksum: 15aa2aeec9b60722348405bc669e6b3c (MD5)
  • description.provenance : Made available in DSpace on 2016-04-15T17:28:39Z (GMT). No. of bitstreams: 2 license_rdf: 1089 bytes, checksum: 0a703d871bf062c5fdc7850b1496693b (MD5) JenningsSexBasedDifferences.PDF: 575983 bytes, checksum: 15aa2aeec9b60722348405bc669e6b3c (MD5) Previous issue date: 2016-03-02

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items