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Populations of the Butterfly Goodeid (Ameca splendens) in the Upper Rio Ameca Basin, Mexico

ABSTRACT The endangered endemic fish Ameca splendens was surveyed monthly from June 2001 to May 2002 at two sites in the upper Rio Ameca basin. Both populations demonstrated two annual reproduction…
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The role of vitellogenin during gestation of Girardinichthys viviparus and Ameca splendens; two goodeid fish with matrotrophic viviparity.

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Effect of Yerbimat Herbicide on Lipid Peroxidation, Catalase Activity, and Histological Damage in Gills and Liver of the Freshwater Fish Goodea Atripinnis

The results of the short-term exposure study indicate that Yerbimat can potentially induce oxidative stress in G. atripinnis, because LPX was increased in the gills and liver.
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Liver histological changes and lipid peroxidation in the amphibian Ambystoma mexicanum induced by sediment elutriates from the Lake Xochimilco.

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Histological Description of the Male and Female Gonads in Tegula eiseni, T. funebralis, T. aureotincta, T. gallina and T. regina from Bahia Tortugas, B.C.S., Mexico

La costa oriental de la Peninsula de Baja California se caracteriza por ser una zona de alta productividad biologica en la que coexiste un elevado numero de gastropodos, algunos de alto valor…
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Reproductive cycle by histological characterization of the ovary in the butterfly goodeid Ameca splendens from the upper Río Ameca Basin, Mexico

The relative frequency of gonadal maturation differed between the study sites and is indicative of the plasticity of A. splendens in facing different conditions within the environments it inhabits.
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ULTRASTRUCTURE OF SPERMATOGENESIS IN THE WHITE CLAM CHIONE CALIFORNIENSIS (BRODERIP, 1835) (MOLLUSCA: PELECYPODA)

Results indicate spermatogonia have a central, spherical nucleus as well as scattered heterochromatin granules throughout the nucleoplasm, and chromatin is fully condensed, taking up the entire nucleus.
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Liver Histopatology, Lipidperoxidation and Somatic Indices of Fulica americana in Xochimilco (Urban) and Tecocomulco (Rural) Wetlands in the Mexico Basin

E. F. americana puede ser utilizada como centinela debido a que presento respuestas diferenciadas en los indices somaticos y en los biomarcadores histopatologicos y de estres oxidativo en las distintas localidades, sexo y epocas del ano.
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Biological Responses of the American Coot (Fulica americana), in wetlands with contrasting environmental conditions (Basin of México)

Early-warning biomarkers revealed that coots displayed higher lipid peroxidation and elevated activities of gamma-glutamyl transferase and alanine aminotransferase, suggesting hepatic damage during autumn and winter, which may be irreversible with potentially adversely reproductive consequences.
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Histological Description of Oogenesis in Chiton virgulatus (Mollusca: Polyplacophora)

Las proyecciones citoplasmaticas del casco del ovocito crecen y en su parte apical adquieren the forma of un tridente, las celulas foliculares, dado el crecimiento de the prolongacion toman el aspecto bulboso y llegan a medir hasta 20 µm of longitud.
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