Esfuerzo reproductor en dos especies vivíparas de esquincos de cola azul (Squamata: Scincidae: Plestiodon) de México
DOI:
https://doi.org/10.22201/ib.20078706e.2023.94.3999Palabras clave:
Características de historia de vida, Masa relativa de camada, Trade-off, Índice de condición corporalResumen
La asignación relativa de energía que los organismos destinan a los procesos reproductores (esfuerzo reproductor)
constituye un tema central en la teoría de historias de vida. Documentamos algunos aspectos de la ecología e inversión reproductora de 2 especies de esquincos vivíparos del género Plestiodon de México, una especie no descrita
previamente asignada a P. brevirostris (Plestiodon sp., La Malinche, Tlaxcala, 2,700-3,000 m) y P. dugesii (2 poblaciones, Mazamitla y Tapalpa, Jalisco, 2,400-2,500 m). Usamos la masa relativa de camada (MRC) como medida del esfuerzo reproductor y calculamos un índice de condición corporal (ICC) como aproximación del estado energético de hembras no gestantes, posparturientas y neonatos. No hubo diferencias en las características reproductoras de las 2 poblaciones de P. dugesii. Ninguna especie presentó dimorfismo sexual en la talla y la talla de la hembra no influyó sobre la MRC, ni en el tamaño o en la masa de la camada. El ICC de las hembras influyó sobre la MRC y, en P. dugesii, el tamaño de camada se correlacionó negativamente con el ICC de neonatos. Pese a las semejanzas generales en inversión reproductora, parece haber presiones selectivas diferenciales que moldean las características de las crías de estas 2 especies.
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