Convergent Evolution in Tooth Morphology of Filter Feeding Lamniform Sharks
The basking shark (Cetorhinus maximus) and megamouth shark (Megachasma pelagios) are two species of filter-feeding sharks, both belonging to the order Lamniformes. There are two conflicting hypotheses regarding the origins of filter feeding in lamniform sharks; that there is a single origin of filte...
Main Authors: | , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
CORE Scholar
2018
|
Subjects: | |
Online Access: | https://corescholar.libraries.wright.edu/biology/845 |
id |
ftwrightuniv:oai:corescholar.libraries.wright.edu:biology-1876 |
---|---|
record_format |
openpolar |
spelling |
ftwrightuniv:oai:corescholar.libraries.wright.edu:biology-1876 2023-05-15T15:53:52+02:00 Convergent Evolution in Tooth Morphology of Filter Feeding Lamniform Sharks Mitchell, Michaela G. Ciampaglio, Charles Jacquemin, Stephen J. 2018-11-01T07:00:00Z https://corescholar.libraries.wright.edu/biology/845 unknown CORE Scholar https://corescholar.libraries.wright.edu/biology/845 Biological Sciences Faculty Publications Biology Life Sciences Medical Sciences Medicine and Health Sciences Systems Biology text 2018 ftwrightuniv 2022-09-29T17:46:01Z The basking shark (Cetorhinus maximus) and megamouth shark (Megachasma pelagios) are two species of filter-feeding sharks, both belonging to the order Lamniformes. There are two conflicting hypotheses regarding the origins of filter feeding in lamniform sharks; that there is a single origin of filter feeding within Lamniformes, or conversely, the filter-feeding adaptations have been developed independently due to different ancestral conditions. Evidence obtained from several morphological and molecular studies strongly supports the latter hypothesis. Because evidence suggests that Megachasma and Cetorhinus have developed their filterfeeding adaptations independently, we hypothesized that convergent evolution in tooth morphology is taking place within these two lineages. Geometric morphometric analyses were performed on fossil and recent teeth of Megachasma and Cetorhinus to determine if there is commonality among tooth shape. Increasingly similar shapes in recent teeth compared with fossil teeth would provide one piece of evidence to support this hypothesis. Relative warp axes were interpreted using percent variation explained and compared by species. Multivariate analyses of variance (MANOVA) were used to test for significant morphological differences in fossil and recent teeth of each species and a series of one-way analyses of variance (ANOVA) with corresponding Tukey intervals (95% CI) was used to test for morphological differences in overall mean tooth shapes between fossil and recent Megachasma and Cetorhinus teeth for each significant relative warp axis. The results of the MANOVAs showed significant differences in fossil and recent Megachasma and Cetorhinus teeth and support independently derived filter-feeding adaptations and the results of the ANOVAs and corresponding Tukey intervals support convergent evolution in tooth morphology within these two species of filter-feeding lamniform sharks. Text Cetorhinus maximus Wright State University: CORE Scholar (Campus Online Repository) |
institution |
Open Polar |
collection |
Wright State University: CORE Scholar (Campus Online Repository) |
op_collection_id |
ftwrightuniv |
language |
unknown |
topic |
Biology Life Sciences Medical Sciences Medicine and Health Sciences Systems Biology |
spellingShingle |
Biology Life Sciences Medical Sciences Medicine and Health Sciences Systems Biology Mitchell, Michaela G. Ciampaglio, Charles Jacquemin, Stephen J. Convergent Evolution in Tooth Morphology of Filter Feeding Lamniform Sharks |
topic_facet |
Biology Life Sciences Medical Sciences Medicine and Health Sciences Systems Biology |
description |
The basking shark (Cetorhinus maximus) and megamouth shark (Megachasma pelagios) are two species of filter-feeding sharks, both belonging to the order Lamniformes. There are two conflicting hypotheses regarding the origins of filter feeding in lamniform sharks; that there is a single origin of filter feeding within Lamniformes, or conversely, the filter-feeding adaptations have been developed independently due to different ancestral conditions. Evidence obtained from several morphological and molecular studies strongly supports the latter hypothesis. Because evidence suggests that Megachasma and Cetorhinus have developed their filterfeeding adaptations independently, we hypothesized that convergent evolution in tooth morphology is taking place within these two lineages. Geometric morphometric analyses were performed on fossil and recent teeth of Megachasma and Cetorhinus to determine if there is commonality among tooth shape. Increasingly similar shapes in recent teeth compared with fossil teeth would provide one piece of evidence to support this hypothesis. Relative warp axes were interpreted using percent variation explained and compared by species. Multivariate analyses of variance (MANOVA) were used to test for significant morphological differences in fossil and recent teeth of each species and a series of one-way analyses of variance (ANOVA) with corresponding Tukey intervals (95% CI) was used to test for morphological differences in overall mean tooth shapes between fossil and recent Megachasma and Cetorhinus teeth for each significant relative warp axis. The results of the MANOVAs showed significant differences in fossil and recent Megachasma and Cetorhinus teeth and support independently derived filter-feeding adaptations and the results of the ANOVAs and corresponding Tukey intervals support convergent evolution in tooth morphology within these two species of filter-feeding lamniform sharks. |
format |
Text |
author |
Mitchell, Michaela G. Ciampaglio, Charles Jacquemin, Stephen J. |
author_facet |
Mitchell, Michaela G. Ciampaglio, Charles Jacquemin, Stephen J. |
author_sort |
Mitchell, Michaela G. |
title |
Convergent Evolution in Tooth Morphology of Filter Feeding Lamniform Sharks |
title_short |
Convergent Evolution in Tooth Morphology of Filter Feeding Lamniform Sharks |
title_full |
Convergent Evolution in Tooth Morphology of Filter Feeding Lamniform Sharks |
title_fullStr |
Convergent Evolution in Tooth Morphology of Filter Feeding Lamniform Sharks |
title_full_unstemmed |
Convergent Evolution in Tooth Morphology of Filter Feeding Lamniform Sharks |
title_sort |
convergent evolution in tooth morphology of filter feeding lamniform sharks |
publisher |
CORE Scholar |
publishDate |
2018 |
url |
https://corescholar.libraries.wright.edu/biology/845 |
genre |
Cetorhinus maximus |
genre_facet |
Cetorhinus maximus |
op_source |
Biological Sciences Faculty Publications |
op_relation |
https://corescholar.libraries.wright.edu/biology/845 |
_version_ |
1766389042858950656 |