Aspectos histológicos do trato digestivo de Sotalia fluviatilis (Cetacea, Delphinidae): esôfago e estômago

Chaves, Paulo de Tarso; Silva, Vera Maria Ferreira da

doi:10.1590/s0101-81751988000100007

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“…This could help to explain why C. cetaceum occurs in the pyloric region of monogastric (monocompartmentalized) species such as A. autralis (Ridgway, 1972) and closer to the duodenum portion. The pyloric stomachal chamber of Cetacea shares the same muciparous glandular characteristic (Harrison et al, 1970;Smith, 1972;Chaves & Silva, 1988;Silva & Cousin, 2006b). In the present study, gastric corynosomiasis in the monocompartmentalized stomach of A. australis, showed higher P% in the pyloric portion composed only by mucosal muciparous glands.…”

Section: Discussionmentioning

confidence: 99%

Corynosoma cetaceum Johnston & Best, 1942 (Acanthocephala, Polymorphidae) in Arctocephalus australis Zimmermann, 1783 (Mammalia: Pinnipedia): Histopathology, parasitological indices, seasonality and host gender influences

Silva¹,

Cousin²,

Pereira³

2013

Estud Biol.

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The parasitological indices [Prevalence (P%), Mean Intensity (MI), Mean Abundance (MA) and the Range of Variation (Ax)] of Corynosoma cetaceum in Arctocephalus australis and the histopathology caused by this parasite are presented based on the necropsy of 32 specimens found stranded dead on the shore of Rio Grande do Sul, Brazil, from 2008 to 2010. Differences between the genders of the hosts as well as for their reproductive status [males (pups, prepubertals) and females (pups, reproductive-breeding)] were analyzed for P% (Chi-square test, X2) and MI (Bootstrap Confidence Interval, BCa , p < 0,05) and between genders of the hosts for season groups (Spring-Summer: S-S; Autumn-Winter: A-W). Abnormal tissue samplings of the stomachs (histopathology caused by the parasite) and the gonads (for analysis of the sexual maturity) of the hosts were submitted to the histological procedure of paraffin embedding and mounting of permanent slides in balsam. The infection occurred along the sampling period with low P%, MI and MA (respectively) for the genders of the hosts (males: 37.5, 2.83 and 1.5; females: 31.3, 3 and 1), for the reproductive status of the hosts (males pups: 25, 1.33 and 1; prepubertal males: 75, 4.33 and 5; female pups: 28.6, 2.5 and 1; reproductive-breeding females: 50. 5 and 5) and for season groups (S-S: 16.7, 4 and 0.67; A-W: 45, 2.78 and 1.25). Concerning to the hosts, there were no parasitological indices-related differences between genders and sexual maturation status. There were no season-related differences for P% and MI. The results suggest an accidental infection of C. cetaceum in A. australis despite the absence of severe inflammatory processes added with the parasite’s inadequate development.

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Section: Discussionmentioning

confidence: 99%