Con la finalidad de estudiar las variaciones ambientales a nivel espacio-temporal en lagunas costeras tropicales y su impacto fauna residente, se analizó composición isotópica (δ18O δ13C) 70 otolitos (1 por par) pertenecientes al pez Bairdiella chrysoura, considerada especie residente del Área Protección Flora Fauna Laguna Términos (APFFLT). Se realizaron muestreos mensuales (septiembre 2016 ag...

Electron microscopy reveals a star-like pigment cell at the center of the eye of the arrow-worm, Sagitta scrippsae. Between the arms of the pigment cell are clusters of photoreceptor cell processes, each process consisting of: (1) a tubular segment containing longitudinally arranged microtubules about 500 A in diameter and 20 micro in length; (2) a remarkable conical body, composed of cords and...

The junctional complex of the intestine of Sagitta setosa has been studied in tissues stained with uranyl acetate or after lanthanum impregnation, and by freeze-cleavage. All types of junctions have been characterized in both perpendicular and tangential planes. From the apex to the base of the cell the following junctions occur in this order: a zonula adhaerens; a septate junction where the se...

Invasive species are among the most important problems for biodiversity conservation worldwide, particularly in megadiverse countries such as Brazil. However, there is no biological information to develop policies managing invasive populations many cases. The life history parameters and otolith variations essential understanding adaptations of introduced marine environments. This study aimed id...

The sagitta otoliths of teleostean fishes are usually used in diverse studies. Their shapes species-specific, and the qualitative description their morphological features seems to be a simple task, despite its subjectivity. On other hand, morphometric techniques have been developed with focus on objectivity, reproducibility, accuracy. Considering this, morphology was reviewed evaluated terms ro...