Morphometrics and structure of complete baleen racks in gray whales (Eschrichtius robustus) from the Eastern North Pacific Ocean

The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology
Samantha YoungNicholas T Zellmer

Abstract

Mysticetes have evolved a novel filter feeding apparatus-baleen-an epidermal keratinous tissue composed of keratin that grows as a serial arrangement of transverse cornified laminae from the right and left sides of the palate. The structure and function of baleen varies among extant mysticete clades and this variation likely can be viewed as adaptations related to different filter feeding strategies. In one of the first morphometric studies of the full baleen apparatus, we describe the morphology of complete baleen racks in neonate, yearling and adult gray whales (Eschrichtius robustus), and note morphometric variations between age groups as well as within individual racks. Morphometric data and detailed descriptions were collected from the full baleen apparatus of three frozen specimens of E. robustus using previously derived ecologically significant and broad scale measurements of baleen. Additionally, characters of the baleen apparatus were described based on visible patterns of baleen laminae and plates on the dorsal root of the rack. Results indicate that the longest, widest, and thickest plates and laminae are found toward the posterior half of the rack, resulting in the greatest surface area for filtration of prey occurr...Continue Reading

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Citations

Jan 31, 2016·Journal of Morphology·Alexander J WerthRobert E Shadwick
Feb 11, 2015·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Eric G EkdaleAnnalisa Berta
Jan 21, 2011·PloS One·David J StarkeyMichaela Barnard
Sep 14, 2016·Annual Review of Marine Science·J A GoldbogenA J Werth
Apr 13, 2017·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Alexander J Werth, Haruka Ito
May 26, 2017·Journal of Anatomy·Felix G MarxGiovanni Bianucci
Apr 5, 2019·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Jeffrey T Laitman, Kurt H Albertine
Nov 18, 2016·Royal Society Open Science·Alexander J WerthTodd L Sformo
Oct 4, 2017·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Kurt H AlbertineKenneth Bo Foreman
Oct 4, 2017·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Megan M JensenJeremy A Goldbogen

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