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Title: Morphological structure of the aortic wall in three Delphinid species with shallow or intermediate diving habits: Evidence for diving adaptation
Authors: Mompeó Corredera, Blanca Rosa 
Pérez Santana, Lilian Rosa 
Fernández Rodríguez, Antonio Jesús 
Saavedra Santana, Pedro 
Rivero Santana, Miguel Antonio 
Arbelo Hernández, Manuel Antonio 
Arregui Gil, Marina 
Suarez-Santana, Cristian 
Bernaldo de Quirós Miranda, Yara 
UNESCO Clasification: 3105 Peces y fauna silvestre
310907 Patología
Keywords: Mechanical Design
Lamellar Unit
Tunica Media
Elastin, et al
Issue Date: 2020
Journal: Journal of Morphology 
Abstract: Some modifications in the vascular system of marine mammals provide adaptive advantages for diving. This study analyses the organisation of the aortic wall in dolphins, observing artery changes in volume and blood pressure for diving behaviour. Samples of three aortic segments (ascending, thoracic and abdominal) of three dolphin species were processed for histological and morphometric studies. The three dolphin species used, striped dolphin (Stenella coeruleoalba), Atlantic spotted dolphin (Stenella frontalis) and common dolphin (Delphinus delphis), have shallow or intermediate diving habits. Our results indicated that the components of the aortic wall of the dolphins had different dispositions in the three selected segments. The aortic wall decreased in thickness along its length due to a loss of the lamellar units in the tunica media and a thinning of the main elements of the lamellar units along the artery. The life stage had little influence on the thickness of the aortic wall except for the ascending aorta. The weight, body length, species or sex of the specimen did not significantly influence the thickness of the wall or the lamellar units. In summary, the histological and morphometric aortic structure in dolphins, in relation to the studied parameters, seems to be similar to that previously described of terrestrial mammals such as pigs, except for a larger difference in the proportion of lamellar units between the ascending and thoracic segments.
ISSN: 0362-2525
DOI: 10.1002/jmor.21105
Source: Journal Of Morphology [ISSN 0362-2525], v. 281 (3), p. 377-387
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