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THE COMPARATIVE ANATOMY OF BALEEN EVOLUTIONARY AND ECOLOGICAL IMPLICATIONS - sdsu-dspace calstate

THE COMPARATIVE ANATOMY OF BALEEN EVOLUTIONARY AND ECOLOGICAL IMPLICATIONS - sdsu-dspace calstate 2025

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The thesis titled 'The Comparative Anatomy of Baleen: Evolutionary and Ecological Implications' by Samantha Allison Young presents a comprehensive study on the morphology and structure of baleen across four clades of mysticete whales. It includes quantitative analyses of baleen characteristics, such as plate length, width, bristle density, and ultrastructure using Scanning Electron Microscopy (SEM). The research explores evolutionary patterns and ecological implications related to feeding strategies, revealing that while some baleen traits exhibit phylogenetic signals, others reflect adaptations to specific feeding methods or prey types. The study concludes that baleen morphology is influenced by both evolutionary history and ecological specialization, contributing to our understanding of the adaptive radiation of mysticetes.

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What are baleen made of?

These bristly baleen plates filter, sift, sieve or trap the whales favourite prey from seawater inside their mouths. Baleen is made out of keratin, the same protein that makes up our fingernails and hair.

What is the structure of baleen plate?

Each plate of baleen consists of long flexible hairs bound together by connective tissue and embedded in the upper gum. Made of keratin, they are similar in appearance to human fingernails. Hundreds of plates, one alongside the other, line each side of the upper jaw, hanging downward.

What does comparative anatomy suggest about the evolution of whales?

Comparative Anatomy of Whales This is evidence that whales, as mammals, share a common ancestor with other mammals. Another example of a homologous structure in whales is their inner ear bones. The inner ear bones of a whale are extremely similar to land mammals, but the one difference is that they are fused together.

How are Odontocete toothed whales different from Mysticete baleen whales which are the better known and studied?

In some ways, baleen whales are very different from toothed whales. Instead of teeth, they have large baleen plates in their mouth that hang down from their upper jaw. These baleen plates are made of the same material as our fingernails.

What is the structure of the baleen?

The basic structure of the whale baleen has been described as a tubular structure with a hollow medulla (inner core) enclosed by a tubular layer with a diameter varying from 60 to 900 microns, which had approximately 2.7 times higher calcium content than the outer solid shell.