Distribución espacial y estructura de la población de cangrejos violinistas en manglares de Sundarban, India
DOI:
https://doi.org/10.3989/scimar.04121.15APalabras clave:
cangrejo violinista, regresión múltiple, estructura poblacional, manglares, Sundarban, variación temporalResumen
Los cangrejos braquiuros constituyen el grupo más abundante de la fauna de los manglares y aportan una amplia gama de servicios en los ecosistemas. En el presente trabajo se estudia la variación estacional en la densidad y biomasa de la población, junto con aspectos demográficos y proporción de sexos en cuatro especies de cangrejos violinistas (Uca rosea, U. triangularis, U. dussumieri y U. vocans) del manglar Sundarban en la isla de Jhorkhali. Estos datos se relacionan con algunos parámetros ambientales (salinidad, contenido de nutrientes, carbono orgánico del suelo, oxígeno disuelto, materia disuelta etc.). El muestreo se realizó durante 3 años (2010-2012) y con periodicidad bimensual. La máxima densidad y biomasa poblacional se observaron durante el mes pre-monzón y mínima durante el monzón. Se observaron picos distintos en la actividad reproductora entre los reproductores estacionales (U. triangularis y U. dussumieri). En U. vocans, los máximos en el sex-ratio disminuyeron durante el período de puesta. Las cuatro especies se caracterizan por un mayor número de machos que de hembras. Los análisis de regresión múltiple indicaron un efecto acumulativo de varios parámetros ambientales. La periodicidad de la puesta puede estar relacionada con varios factores incluyendo temperatura, tipo de sustrato, disponibilidad de alimento y la zonación intermareal.
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