Palabras clave
Neritina reclivata
Neritina punctulata
shell color
phenotypic variability
polymorphism.
Neritina virginea
Neritina reclivata
Neritina punctulata
coloración de concha
variación fenotípica
polimorfismo.
Cómo citar
Resumen
Los gasterópodos Neritinidae de Puerto Rico presentan un ciclo de vida anfídromo y exhiben polimorfismo en los patrones de coloración de la concha. Se identificó que la oviposición aumenta río arriba conforme los individuos alcanzan mayores tamaños, a pesar de que la densidad poblacional disminuye. La frecuencia de siete fenotipos previamente establecidos se analizó en diez ríos de la isla durante dos años (n=8 751 individuos). Debido a que el río Mameyes es el más conservado, se tomó como modelo para estudiar la variación a lo largo del río y entre hábitats durante tres años. El fenotipo de líneas axiales y puntos (N. virginea) fue el predominante en toda la isla y el fenotipo pateloide (N. punctulata) fue el menos frecuente. Se observaron diferencias significativas de las frecuencias de los fenotipos (principalmente en los secundarios) entre ríos, a lo largo de ellos y entre hábitats. Esta variabilidad espacial puede responder a gradientes de salinidad y depredación. Se observó plasticidad fenotípica en algunos individuos.Citas
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