Behavioral Performance and Evolution of Feeding Modes in Odontocetes
Vertebrate evolution has resulted in a diversity of feeding mechanisms. Cetaceans are secondarily derived tetrapods that have returned to a marine habitat. As a result, they display feeding modes that have converged with more basal aquatic vertebrates, but display a diversity of new solutions and ad...
Main Author: | |
---|---|
Other Authors: | , , |
Format: | Book |
Language: | English |
Published: |
2009
|
Subjects: | |
Online Access: | https://hdl.handle.net/1969.1/ETD-TAMU-2009-05-463 |
id |
fttexasamuniv:oai:oaktrust.library.tamu.edu:1969.1/ETD-TAMU-2009-05-463 |
---|---|
record_format |
openpolar |
spelling |
fttexasamuniv:oai:oaktrust.library.tamu.edu:1969.1/ETD-TAMU-2009-05-463 2023-07-16T03:57:44+02:00 Behavioral Performance and Evolution of Feeding Modes in Odontocetes Kane, Emily A. Marshall, Christopher D. Quigg, Antonietta Würsig, Bernd May 2009 application/pdf https://hdl.handle.net/1969.1/ETD-TAMU-2009-05-463 eng eng https://hdl.handle.net/1969.1/ETD-TAMU-2009-05-463 Suction Ram Beluga Pacific white-sided dolphin Pilot whale kinematic analysis RSI aperture shape lateral occlusion pursing pressure measurement performance gap coding ancestral state reconstruction Book Thesis Electronic Thesis text 2009 fttexasamuniv 2023-06-27T23:01:14Z Vertebrate evolution has resulted in a diversity of feeding mechanisms. Cetaceans are secondarily derived tetrapods that have returned to a marine habitat. As a result, they display feeding modes that have converged with more basal aquatic vertebrates, but display a diversity of new solutions and adaptations. To begin to explore the diversity of feeding adaptations among odontocetes, kinematics of feeding modes and feeding adaptations for belugas (Delphinapterus leucas), Pacific white-sided dolphins (Lagenorhynchus obliquidens), and long-finned pilot whales (Globicephala melas) were characterized. In addition, direct measurements of intraoral pressure were collected to determine maximum suction performance. Characters from these analyses were combined with data for other odontocetes, and were mapped onto a phylogeny of Odontoceti to begin to explore where changes in feeding modes took place. Feeding modes were diverse in belugas, Pacific white-sided dolphins, and pilot whales and included suction, ram, and a combination of both. In general, four phases were observed: (I) preparatory, (II) jaw opening, (III) gular depression, and (IV) jaw closing. Suction was a large component of the prey capture method in belugas and subambient pressures in excess of 100 kPa were generated. Belugas were also capable of lateral lip gape occlusion and anterior lip pursing to form a small anterior aperture. Pacific whitesided dolphins relied on ram to capture prey. However, some degree of pursing and resultant subambient pressure was observed that was likely used to compensate for high ram speeds or for prey manipulation and transport to the esophagus. Pilot whales were more similar to belugas in kinematics, but maintained high approach velocities and did not generate significant suction pressures; suction and ram were used in combination. Belugas and pilot whales appeared to employ hyolingual depression as a primary suction generation mechanism, whereas Pacific white-sided dolphins relied on fast jaw opening. Ancestral state ... Book Beluga Beluga* Delphinapterus leucas Texas A&M University Digital Repository Pacific |
institution |
Open Polar |
collection |
Texas A&M University Digital Repository |
op_collection_id |
fttexasamuniv |
language |
English |
topic |
Suction Ram Beluga Pacific white-sided dolphin Pilot whale kinematic analysis RSI aperture shape lateral occlusion pursing pressure measurement performance gap coding ancestral state reconstruction |
spellingShingle |
Suction Ram Beluga Pacific white-sided dolphin Pilot whale kinematic analysis RSI aperture shape lateral occlusion pursing pressure measurement performance gap coding ancestral state reconstruction Kane, Emily A. Behavioral Performance and Evolution of Feeding Modes in Odontocetes |
topic_facet |
Suction Ram Beluga Pacific white-sided dolphin Pilot whale kinematic analysis RSI aperture shape lateral occlusion pursing pressure measurement performance gap coding ancestral state reconstruction |
description |
Vertebrate evolution has resulted in a diversity of feeding mechanisms. Cetaceans are secondarily derived tetrapods that have returned to a marine habitat. As a result, they display feeding modes that have converged with more basal aquatic vertebrates, but display a diversity of new solutions and adaptations. To begin to explore the diversity of feeding adaptations among odontocetes, kinematics of feeding modes and feeding adaptations for belugas (Delphinapterus leucas), Pacific white-sided dolphins (Lagenorhynchus obliquidens), and long-finned pilot whales (Globicephala melas) were characterized. In addition, direct measurements of intraoral pressure were collected to determine maximum suction performance. Characters from these analyses were combined with data for other odontocetes, and were mapped onto a phylogeny of Odontoceti to begin to explore where changes in feeding modes took place. Feeding modes were diverse in belugas, Pacific white-sided dolphins, and pilot whales and included suction, ram, and a combination of both. In general, four phases were observed: (I) preparatory, (II) jaw opening, (III) gular depression, and (IV) jaw closing. Suction was a large component of the prey capture method in belugas and subambient pressures in excess of 100 kPa were generated. Belugas were also capable of lateral lip gape occlusion and anterior lip pursing to form a small anterior aperture. Pacific whitesided dolphins relied on ram to capture prey. However, some degree of pursing and resultant subambient pressure was observed that was likely used to compensate for high ram speeds or for prey manipulation and transport to the esophagus. Pilot whales were more similar to belugas in kinematics, but maintained high approach velocities and did not generate significant suction pressures; suction and ram were used in combination. Belugas and pilot whales appeared to employ hyolingual depression as a primary suction generation mechanism, whereas Pacific white-sided dolphins relied on fast jaw opening. Ancestral state ... |
author2 |
Marshall, Christopher D. Quigg, Antonietta Würsig, Bernd |
format |
Book |
author |
Kane, Emily A. |
author_facet |
Kane, Emily A. |
author_sort |
Kane, Emily A. |
title |
Behavioral Performance and Evolution of Feeding Modes in Odontocetes |
title_short |
Behavioral Performance and Evolution of Feeding Modes in Odontocetes |
title_full |
Behavioral Performance and Evolution of Feeding Modes in Odontocetes |
title_fullStr |
Behavioral Performance and Evolution of Feeding Modes in Odontocetes |
title_full_unstemmed |
Behavioral Performance and Evolution of Feeding Modes in Odontocetes |
title_sort |
behavioral performance and evolution of feeding modes in odontocetes |
publishDate |
2009 |
url |
https://hdl.handle.net/1969.1/ETD-TAMU-2009-05-463 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Beluga Beluga* Delphinapterus leucas |
genre_facet |
Beluga Beluga* Delphinapterus leucas |
op_relation |
https://hdl.handle.net/1969.1/ETD-TAMU-2009-05-463 |
_version_ |
1771544428499959808 |