Development of predictive models for determining fetal age‐at‐length in belugas ( Delphinapterus leucas) and their application towardin situandex situpopulation management
Abstract For wild belugas ( Delphinapterus leucas ), gestation length estimates based on fetal size have produced extreme ranges. Ex situ populations thereby provide unique opportunities to define this important life history event. Accordingly, research with ultrasound was conducted on six beluga wh...
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crwiley:10.1111/mms.12180 2024-09-15T17:59:00+00:00 Development of predictive models for determining fetal age‐at‐length in belugas ( Delphinapterus leucas) and their application towardin situandex situpopulation management Robeck, Todd R. Schmitt, Todd L. Osborn, Steve 2014 http://dx.doi.org/10.1111/mms.12180 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmms.12180 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12180 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mms.12180 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ Marine Mammal Science volume 31, issue 2, page 591-611 ISSN 0824-0469 1748-7692 journal-article 2014 crwiley https://doi.org/10.1111/mms.12180 2024-08-20T04:14:14Z Abstract For wild belugas ( Delphinapterus leucas ), gestation length estimates based on fetal size have produced extreme ranges. Ex situ populations thereby provide unique opportunities to define this important life history event. Accordingly, research with ultrasound was conducted on six beluga whales over 11 gestations with known conception dates to serially measure fetal changes in biparietal diameter ( BP ), thoracic diameter ( TD ), thoracic circumference ( TC ), and total length ( TL ). Incremental polynomial regression analyses were performed on each fetal measurement to develop predictive models for determining age based on fetal size and days from parturition. Gestation length ( n = 11) was a mean 467 ± 5.4 d with male calves (478 ± 8.6 d) experiencing a longer gestation ( P = 0.04) than females (457 ± 3.9 d). Age at TL was best described using a 2nd order polynomial model, while linear relationships existed for BPD , TD , and TC . Accuracy was improved for predicting age ( P = 0.001) or days prior to parturition ( P = 0.038) using data from the first vs . the second half of gestation. The results provide accurate models for aging beluga fetuses based on size in both in situ and ex situ populations. Article in Journal/Newspaper Beluga Beluga* Delphinapterus leucas Wiley Online Library Marine Mammal Science 31 2 591 611 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract For wild belugas ( Delphinapterus leucas ), gestation length estimates based on fetal size have produced extreme ranges. Ex situ populations thereby provide unique opportunities to define this important life history event. Accordingly, research with ultrasound was conducted on six beluga whales over 11 gestations with known conception dates to serially measure fetal changes in biparietal diameter ( BP ), thoracic diameter ( TD ), thoracic circumference ( TC ), and total length ( TL ). Incremental polynomial regression analyses were performed on each fetal measurement to develop predictive models for determining age based on fetal size and days from parturition. Gestation length ( n = 11) was a mean 467 ± 5.4 d with male calves (478 ± 8.6 d) experiencing a longer gestation ( P = 0.04) than females (457 ± 3.9 d). Age at TL was best described using a 2nd order polynomial model, while linear relationships existed for BPD , TD , and TC . Accuracy was improved for predicting age ( P = 0.001) or days prior to parturition ( P = 0.038) using data from the first vs . the second half of gestation. The results provide accurate models for aging beluga fetuses based on size in both in situ and ex situ populations. |
format |
Article in Journal/Newspaper |
author |
Robeck, Todd R. Schmitt, Todd L. Osborn, Steve |
spellingShingle |
Robeck, Todd R. Schmitt, Todd L. Osborn, Steve Development of predictive models for determining fetal age‐at‐length in belugas ( Delphinapterus leucas) and their application towardin situandex situpopulation management |
author_facet |
Robeck, Todd R. Schmitt, Todd L. Osborn, Steve |
author_sort |
Robeck, Todd R. |
title |
Development of predictive models for determining fetal age‐at‐length in belugas ( Delphinapterus leucas) and their application towardin situandex situpopulation management |
title_short |
Development of predictive models for determining fetal age‐at‐length in belugas ( Delphinapterus leucas) and their application towardin situandex situpopulation management |
title_full |
Development of predictive models for determining fetal age‐at‐length in belugas ( Delphinapterus leucas) and their application towardin situandex situpopulation management |
title_fullStr |
Development of predictive models for determining fetal age‐at‐length in belugas ( Delphinapterus leucas) and their application towardin situandex situpopulation management |
title_full_unstemmed |
Development of predictive models for determining fetal age‐at‐length in belugas ( Delphinapterus leucas) and their application towardin situandex situpopulation management |
title_sort |
development of predictive models for determining fetal age‐at‐length in belugas ( delphinapterus leucas) and their application towardin situandex situpopulation management |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/mms.12180 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmms.12180 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12180 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mms.12180 |
genre |
Beluga Beluga* Delphinapterus leucas |
genre_facet |
Beluga Beluga* Delphinapterus leucas |
op_source |
Marine Mammal Science volume 31, issue 2, page 591-611 ISSN 0824-0469 1748-7692 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1111/mms.12180 |
container_title |
Marine Mammal Science |
container_volume |
31 |
container_issue |
2 |
container_start_page |
591 |
op_container_end_page |
611 |
_version_ |
1810435961645957120 |