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Comparing Dietary Differences among the Hornless Artiodactyl Ruminants Hypertragulus, Hypisodus, and Leptomeryx from the Early Oligocene (Orellan) Brule Formation, Toadstool Geologic Park, Nebraska.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Comparing Dietary Differences among the Hornless Artiodactyl Ruminants Hypertragulus, Hypisodus, and Leptomeryx from the Early Oligocene (Orellan) Brule Formation, Toadstool Geologic Park, Nebraska./
作者:	Seyler, Holly.
面頁冊數:	1 online resource (111 pages)
附註:	Source: Masters Abstracts International, Volume: 80-04.
Contained By:	Masters Abstracts International80-04.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10928965click for full text (PQDT)
ISBN:	9780438443747

Comparing Dietary Differences among the Hornless Artiodactyl Ruminants Hypertragulus, Hypisodus, and Leptomeryx from the Early Oligocene (Orellan) Brule Formation, Toadstool Geologic Park, Nebraska.
Seyler, Holly.

Comparing Dietary Differences among the Hornless Artiodactyl Ruminants Hypertragulus, Hypisodus, and Leptomeryx from the Early Oligocene (Orellan) Brule Formation, Toadstool Geologic Park, Nebraska. - 1 online resource (111 pages)

Source: Masters Abstracts International, Volume: 80-04.

Thesis (M.S.)--University of Colorado at Boulder, 2019.

Includes bibliographical references

The Early Oligocene (Orellan) in the North American Western Interior is marked by a cooler and dryer climate than the late Eocene (Chadronian). New mammalian taxa appeared while other groups already present began to diversify. This study takes a closer look at the diversification of hornless ruminant artiodactyls present in the Latest Orellan Merycoidodon bullatus Interval Zone through an analysis of 70 specimens from three closely related species: Hypertragulus (27), Hypisodus (18), and Leptomeryx (25) from a single locality in Toadstool Geologic Park, Nebraska. Specifically, we took a closer look at the hypsodonty index, mesowear, and tooth volume, which have been used as proxies for paleodiet. Using a Keyence VHX-2000 Digital Microscope©, the lingual, labial, and occlusal view of the m3 of specimens was imaged and a series of up to 24 measurements were performed on each image. These measurements include length, width, and height of both the overall molar as well as the individual selenes and posterolophid. Values were then analyzed using JMP Statistical Software©, running an analysis of variance test. Results show the three artiodactyls are more distinct from each other in dietary niche than previously thought. The difference in the average hypsodonty index may be enough to categorize them into different feeding behavior groups. Additionally, the values group by species when hypsodonty index is plotted against tooth volume, potentially allowing identification morphometrically as a supplement to morphologically. Furthermore, a new formula to calculate the volume was derived to provide a more accurate value of tooth volume specific to the unique shape of the selenodont teeth possessed by ruminant artiodactyls. Part of this formula [A = (2W1L1)/3] focuses on the occlusal surface area where W1 and L1 represent and width and length respectively of any selene or posterolophid; values are summed together for a total occlusal surface area. The data also yielded a fourth way to calculate occlusal surface area, a modified formula used in previous studies. This study both explores how new technology and techniques can provide more accurate means of gathering measurements for non-destructive analysis and takes a closer look at dietary specialization of these artiodactyls that occurred in the same place at the same time.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9780438443747Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

BruleIndex Terms--Genre/Form:

542853
Electronic books.

Comparing Dietary Differences among the Hornless Artiodactyl Ruminants Hypertragulus, Hypisodus, and Leptomeryx from the Early Oligocene (Orellan) Brule Formation, Toadstool Geologic Park, Nebraska.
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500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Eberle, Jaelyn.
502 $a Thesis (M.S.)--University of Colorado at Boulder, 2019.
504 $a Includes bibliographical references
520 $a The Early Oligocene (Orellan) in the North American Western Interior is marked by a cooler and dryer climate than the late Eocene (Chadronian). New mammalian taxa appeared while other groups already present began to diversify. This study takes a closer look at the diversification of hornless ruminant artiodactyls present in the Latest Orellan Merycoidodon bullatus Interval Zone through an analysis of 70 specimens from three closely related species: Hypertragulus (27), Hypisodus (18), and Leptomeryx (25) from a single locality in Toadstool Geologic Park, Nebraska. Specifically, we took a closer look at the hypsodonty index, mesowear, and tooth volume, which have been used as proxies for paleodiet. Using a Keyence VHX-2000 Digital Microscope©, the lingual, labial, and occlusal view of the m3 of specimens was imaged and a series of up to 24 measurements were performed on each image. These measurements include length, width, and height of both the overall molar as well as the individual selenes and posterolophid. Values were then analyzed using JMP Statistical Software©, running an analysis of variance test. Results show the three artiodactyls are more distinct from each other in dietary niche than previously thought. The difference in the average hypsodonty index may be enough to categorize them into different feeding behavior groups. Additionally, the values group by species when hypsodonty index is plotted against tooth volume, potentially allowing identification morphometrically as a supplement to morphologically. Furthermore, a new formula to calculate the volume was derived to provide a more accurate value of tooth volume specific to the unique shape of the selenodont teeth possessed by ruminant artiodactyls. Part of this formula [A = (2W1L1)/3] focuses on the occlusal surface area where W1 and L1 represent and width and length respectively of any selene or posterolophid; values are summed together for a total occlusal surface area. The data also yielded a fourth way to calculate occlusal surface area, a modified formula used in previous studies. This study both explores how new technology and techniques can provide more accurate means of gathering measurements for non-destructive analysis and takes a closer look at dietary specialization of these artiodactyls that occurred in the same place at the same time.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
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856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10928965 $z click for full text (PQDT)