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1.
J Parasitol ; 105(2): 283-298, 2019 04.
Artículo en Inglés | MEDLINE | ID: mdl-30950763

RESUMEN

Novel molecular data from both mitochondrial ( cytochrome c oxidase subunit 1) and ribosomal regions ( 18S, ITS1-5.8S, ITS2, and 28S) are provided for Sebekia mississippiensis Overstreet, Self, & Vliet, 1985 , a pentastome infecting the American alligator, Alligator mississippiensis Daudin, 1801, and the spotted gar, Lepisosteus oculatus Winchell, 1864. Adult and nymphal pentastomes are described from the lungs and liver of the type host, A. mississippiensis, collected from Mississippi, while additional nymphs are described from the esophageal lining of L. oculatus specimens collected from Louisiana. This sequencing data will facilitate more accurate identification of various life cycle stages of S. mississippiensis, enabling future work to resolve many ambiguities in the literature regarding this species. Additionally, histopathological data are provided from both the definitive and intermediate hosts.


Asunto(s)
Caimanes y Cocodrilos/parasitología , Enfermedades de los Peces/parasitología , Enfermedades Parasitarias en Animales/parasitología , Pentastomida/clasificación , Animales , Esófago/parasitología , Femenino , Enfermedades de los Peces/epidemiología , Peces , Hígado/parasitología , Louisiana/epidemiología , Pulmón/parasitología , Masculino , Mississippi/epidemiología , Ninfa/anatomía & histología , Ninfa/clasificación , Ninfa/genética , Enfermedades Parasitarias en Animales/epidemiología , Pentastomida/anatomía & histología , Pentastomida/genética , Filogenia , Prevalencia , Alineación de Secuencia/veterinaria
2.
Artículo en Inglés | MEDLINE | ID: mdl-17344081

RESUMEN

Fish that transport environmental chloride with a gill uptake mechanism (gill epithelial Cl(-)/HCO(3)(-)cotransport exchange system), also transport nitrite into plasma through the same mechanism. Because of the relationship between nitrite uptake and the gill chloride uptake mechanism, nitrite uptake can provide insight regarding the method of chloride uptake for fish. This study was designed to determine if non-teleost fishes concentrate nitrite in their plasma, and to determine if chloride inhibits nitrite uptake in non-teleost fish. To determine if bowfin Amia calva, spotted gar Lepisosteus oculatus, alligator gar Atractosteus spatula, and paddlefish Polyodon spathula concentrate environmental nitrite in their plasma, individuals were exposed to concentrations of 0, 1, 10, or 100 mg/L nitrite-N. After exposure, all species had plasma nitrite-N concentrations greater than environmental levels. To determine if chloride inhibits nitrite uptake for spotted gar, alligator gar, and paddlefish, fish were exposed to 1 mg/L nitrite-N and 20 mg/L chloride as calcium chloride, or to 1 mg/L nitrite-N only. Chloride effectively prevented nitrite from being concentrated in the plasma of all species. It appears that non-teleost fish concentrate nitrite in their plasma via their chloride uptake mechanism and that this is an ancestral characteristic for teleost.


Asunto(s)
Cloruros/farmacología , Peces/metabolismo , Nitritos/metabolismo , Animales , Nitritos/sangre , Nitritos/farmacología , Filogenia
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