Age-groups classification of Irrawaddy dolphins based on dorsal fin geometric morphological features
The Irrawaddy dolphin is a species at the top of the food chain, but its population is currently endangered. Hence, the critical need to take effective conservation measures for Irrawaddy dolphins, particularly in population reproduction. The age structure of Irrawaddy dolphins can be studied to und...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-10-01
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| Series: | Ecological Indicators |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1470160X23006489 |
| _version_ | 1797683170321104896 |
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| author | Min Sheng Qingxuan He Daoping Yu Benyue Su |
| author_facet | Min Sheng Qingxuan He Daoping Yu Benyue Su |
| author_sort | Min Sheng |
| collection | DOAJ |
| description | The Irrawaddy dolphin is a species at the top of the food chain, but its population is currently endangered. Hence, the critical need to take effective conservation measures for Irrawaddy dolphins, particularly in population reproduction. The age structure of Irrawaddy dolphins can be studied to understand the population reproduction status and provide reference for formulating scientific conservation measures. Unlike age estimation methods based on invasive biological tissue detection and individual biological target detection methods based on audio features or image pixel features, this paper proposes the method to extract the Irrawaddy dolphin's dorsal fin geometric morphological features for classifying age-groups by using non-uniform B-spline. Firstly, this method uses non-uniform B-spline method to fit the dorsal fin edge curve of Irrawaddy dolphins. Then the curve is resolved to extract its derivatives, curvature and other features that describe its geometry morphology. Finally, the random forest (RF) was supplemented to classify Irrawaddy dolphins into juvenile, middle-aged and older. Experiments show that the method proposed in this paper could effectively classify older dolphins to an accuracy of 87.36%. The method proposed in this paper is non-invasive not only can help analyze the Irrawaddy dolphin's development trajectory, understand the reproductive maturity, fecundity rates, and survival rates, but also can help understand the changes of the regional ecological environment and protect the aquatic diversity. |
| first_indexed | 2024-03-12T00:11:37Z |
| format | Article |
| id | doaj.art-ea9e72943df341409355f43bcbacc28f |
| institution | Directory Open Access Journal |
| issn | 1470-160X |
| language | English |
| last_indexed | 2024-03-12T00:11:37Z |
| publishDate | 2023-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecological Indicators |
| spelling | doaj.art-ea9e72943df341409355f43bcbacc28f2023-09-16T05:29:08ZengElsevierEcological Indicators1470-160X2023-10-01154110506Age-groups classification of Irrawaddy dolphins based on dorsal fin geometric morphological featuresMin Sheng0Qingxuan He1Daoping Yu2Benyue Su3School of Mathematics and Physics, Anqing Normal University, Anqing 246133, ChinaSchool of Mathematics and Physics, Anqing Normal University, Anqing 246133, ChinaResearch Center of Aquatic Organism Conservation and Water Ecosystem Restoration in Anhui Province, Anqing Normal University, Anqing 246133, China; College of Life and Science, Anqing Normal University, Anqing 246133, ChinaSchool of Mathematics and Computer, Tongling University, Tongling 244061, China; School of Computer and Information, Anqing Normal University, Anqing 246133, China; Corresponding author.The Irrawaddy dolphin is a species at the top of the food chain, but its population is currently endangered. Hence, the critical need to take effective conservation measures for Irrawaddy dolphins, particularly in population reproduction. The age structure of Irrawaddy dolphins can be studied to understand the population reproduction status and provide reference for formulating scientific conservation measures. Unlike age estimation methods based on invasive biological tissue detection and individual biological target detection methods based on audio features or image pixel features, this paper proposes the method to extract the Irrawaddy dolphin's dorsal fin geometric morphological features for classifying age-groups by using non-uniform B-spline. Firstly, this method uses non-uniform B-spline method to fit the dorsal fin edge curve of Irrawaddy dolphins. Then the curve is resolved to extract its derivatives, curvature and other features that describe its geometry morphology. Finally, the random forest (RF) was supplemented to classify Irrawaddy dolphins into juvenile, middle-aged and older. Experiments show that the method proposed in this paper could effectively classify older dolphins to an accuracy of 87.36%. The method proposed in this paper is non-invasive not only can help analyze the Irrawaddy dolphin's development trajectory, understand the reproductive maturity, fecundity rates, and survival rates, but also can help understand the changes of the regional ecological environment and protect the aquatic diversity.http://www.sciencedirect.com/science/article/pii/S1470160X23006489Irrawaddy dolphinsAge structureDorsal finGeometric morphological featureNon-uniform B-spline |
| spellingShingle | Min Sheng Qingxuan He Daoping Yu Benyue Su Age-groups classification of Irrawaddy dolphins based on dorsal fin geometric morphological features Ecological Indicators Irrawaddy dolphins Age structure Dorsal fin Geometric morphological feature Non-uniform B-spline |
| title | Age-groups classification of Irrawaddy dolphins based on dorsal fin geometric morphological features |
| title_full | Age-groups classification of Irrawaddy dolphins based on dorsal fin geometric morphological features |
| title_fullStr | Age-groups classification of Irrawaddy dolphins based on dorsal fin geometric morphological features |
| title_full_unstemmed | Age-groups classification of Irrawaddy dolphins based on dorsal fin geometric morphological features |
| title_short | Age-groups classification of Irrawaddy dolphins based on dorsal fin geometric morphological features |
| title_sort | age groups classification of irrawaddy dolphins based on dorsal fin geometric morphological features |
| topic | Irrawaddy dolphins Age structure Dorsal fin Geometric morphological feature Non-uniform B-spline |
| url | http://www.sciencedirect.com/science/article/pii/S1470160X23006489 |
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