Caracterização morfológica do esôfago de tartarugas-verdes (Chelonia mydas)

Júnior, Antônio Calais; David, José; Nunes, Lélia Cápua

doi:10.1590/1678-4162-8548

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…The esophagus of E. imbricata hatchlings presented similar shape and topographical relationships to findings already described for other sea turtle species such as C. mydas (Magalhães et al, 2010, 2012; Chen et al, 2015; Calais Junior et al, 2016), L. olivacea , and Caretta caretta (Magalhães et al, 2012). However, Magalhães et al (2012), report the presence of an exceptionally long esophagus in proportion to the curvilinear length of the carapace in Dermochelys coriacea , extending for almost half the length of the body, only then turning to the left and joining the stomach.…”

Section: Discussionsupporting

confidence: 78%

“…The E. imbricata hatchlings analyzed herein present conical, pointed, and cornified papillae covering the entire esophagus, oriented towards the stomach. This characteristic is unique to sea turtles and has been described for both hatchlings and adults of all other sea turtle species (Wyneken, 2004; Magalhães et al, 2010, 2012; Chen et al, 2015; Calais Junior et al, 2016). Another striking feature observed in the esophagus is a developed muscle tunic, mainly in the esophagus-cardia transition.…”

Section: Discussionmentioning

confidence: 73%

“…Calais Junior et al (2016), when describing the esophagus morphology of C. mydas , observed the presence of PAS-positive mucus-producing glands located in the gastroesophageal region mucosa. Vieira-Lopes et al (2014) also verified the presence of well-defined glands interspersed in the mucosal epithelium of the esophagus on some freshwater turtles, such as Phrynops geoffroanus , formed by clear cells in a semicircular arrangement, while Magalhães et al (2014) reported the presence of mucus-producing superficial cells throughout the esophagus when studying the morphology of the DT of freshwater turtles belonging to the Podocnemididae family, forming a continuous layer of secretory cells occupying the entire apical region, stained positively with PAS, more intense in the posterior portion.…”

Section: Discussionmentioning

confidence: 99%

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Morphological characterization of the digestive tube of hawksbill sea turtle (Eretmochelys imbricata) hatchlings

Oliveira

Attademo²,

Sousa

et al. 2022

Microscopy and Microanalysis

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Morphological studies concerning the digestive system can further information on animal diets, thus aiding in the understanding of feeding behavior. Given the scarcity of information on sea turtle digestive system morphology, the aim of the present study was to describe the digestive tube (DT) morphology of Eretmochelys imbricata hatchlings to further understand the diet of these individuals in the wild. DT samples from 10 stillborn turtles (undefined sex) were analyzed at the macro and microscopic levels. The esophagus, stomach, small intestine (SI), and large intestine (LI) are described. Histologically, the DT is formed by four tunics, the mucosa, submucosa, muscular, and adventitia or serosa. The esophagus is lined by keratinized stratified squamous epithelium, while the remainder of the DT is lined by a simple columnar epithelium. The esophagus mucosa is marked by conical, pointed papillae. The stomach comprises three regions, the cardiac, fundic, and pyloric and is covered by neutral mucous granular cells. The intestinal mucosa presents absorptive cells with microvilli, neutral and acidic goblet cells, and mucosa-associated lymphoid tissue. The SI is significantly longer than the LI (p value = 0.006841). These morphological findings are strong indications of adaptations to a carnivorous diet in this hawksbill turtle age group.

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Section: Discussionsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

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Morphological characterization of the digestive tube of hawksbill sea turtle (Eretmochelys imbricata) hatchlings

Oliveira

Attademo²,

Sousa

et al. 2022

Microscopy and Microanalysis

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Morphological description of the digestive tract of the Amazonian Diving Lizard Uranoscodon superciliosus (Linnaeus, 1758) and its associations to the diet and foraging mode

BENCHAYA,

RAMIRES,

PICELLI

et al. 2024

An. Acad. Bras. Ciênc.

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Isolation and characterization of the aerobic bacterial microbiota of the esophagus and its probable association with obstructive caseous lesions in green turtles (Chelonia mydas)

et al. 2020

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Caseous lesions in the esophagus of green turtles (Chelonia mydas) from the coast of Brazil have been described as obstructive lesions and can lead to the death of these animals. However, their etiology remains unclear. The aim of this study was to isolate and characterize the aerobic bacterial microbiota of the esophagus of green turtles (C. mydas) from the Brazilian coast and to verify its possible participation in the etiology of caseous lesions. For this, 42 animals were used, 33 alive and healthy and 9 naturally dead that had esophageal lesions confirmed by necropsy, from Anchieta and Piúma beaches, Espírito Santo. Microbiological tests and morphological evaluation of the esophagus were performed. We isolated 14 different bacterial agents from healthy animal samples, with the prevalence of Pseudomonas aeruginosa being (36.36%), Staphylococcus aureus (33.33%), Aeromonas hydrophila (27.27%), and Vibrio alginolyticus (24.24%). In dead animals, only three distinct agents were isolated: S. aureus (50.00%), A. hydrophila (25.00%), and V. alginolyticus (25.00%). Morphological evaluation revealed a predominance of the lesions at the gastroesophageal junction, with multifocal-to-coalescent distribution, discrete intensity, and absence of obstruction. Ulcerations and caseous exudates, inflammatory infiltrates, parasitic eggs, and giant foreign body cells were also observed as well as bacterial lumps and glandular alterations, such as necrosis, adenitis, and fragments of adult parasites. There was a positive correlation between bacterial lumps and microbiological culture and a negative correlation between bacterial lumps and microbiological culture with parasites. Thus, it was noted that the esophageal aerobic microbiota of C. mydas was predominantly composed of Gram-negative bacteria such as P. aeruginosa, A. hydrophila, and V. alginolyticus, in addition to several enterobacteria and Gram-positive bacteria, such as S. aureus. These agents are opportunists and may be involved in the etiology of caseous esophagitis in association with other pathogens as co-factors working in association or, even in a secondary way.

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Caracterização morfológica do esôfago de tartarugas-verdes (Chelonia mydas)

Cited by 4 publications

References 14 publications

Morphological characterization of the digestive tube of hawksbill sea turtle (Eretmochelys imbricata) hatchlings

Morphological characterization of the digestive tube of hawksbill sea turtle (Eretmochelys imbricata) hatchlings

Morphological description of the digestive tract of the Amazonian Diving Lizard Uranoscodon superciliosus (Linnaeus, 1758) and its associations to the diet and foraging mode

Isolation and characterization of the aerobic bacterial microbiota of the esophagus and its probable association with obstructive caseous lesions in green turtles (Chelonia mydas)

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