Función de los pectenes en detección de presa en hembras del escorpión <em>Centruroides margaritatus </em> (Scorpiones: Buthidae): prueba experimental con grupo control
DOI:
https://doi.org/10.22458/urj.v4i2.3Abstract
La función de los pectenes en escorpiones ha sido objeto de debate por largo tiempo. En general, se sabe que estos órganos están conformados por proyecciones sensitivas cilíndricas que permiten detectar vibraciones y han sido involucrados en la localización de pareja y en el reconocimiento de comportamientos reproductivos de la misma. Una función que ha sido sugerida para los pectenes es la identificación de presas a partir de cambios en las vibraciones del medio. El presente estudio investiga la función de los pectenes del escorpión centroamericano Centruroides margaritatus como estructuras relacionadas a la detección de presas. Pruebas experimentales de comportamiento fueron realizadas para comparar las habilidades de detección de presa en animales con o sin alteración de los pectenes. Sesenta hembras adultas fueron asignadas aleatoriamente a cuatro grupos en números iguales. Los grupos incluyen tres tratamientos (aplicación de parafina, corte de un pecten y corte de ambos pectenes) y un grupo dejado intacto como control. El tiempo de reacción y la detección de presa no difieren entre tratamientos y grupo control. Las frecuencias de los comportamientos observados en cada tratamiento difieren de los controles. La modificación del apéndice sugiere un efecto cualitativo sobre la capacidad para localizar presas. Otros receptores (tricobotrios, órganos tarsales y basitarsales) ubicados en pedipalpos o patas del escorpión C. margaritatus posiblemente sean más importantes para percibir vibraciones emitidas por la presa.
ABSTRACT
Function of pectines for prey detection in female Centruroides
margaritatus scorpions (Scorpiones: Buthidae): an experimental
test with control group. Scorpions have two mid-ventral organs
called pectines, conformed by a row of sensitive tooth-like cylindrical
projections. The functions of these appendages are varied, but those
related with the detection of preys are controversial. Here, I investigate
the prey-detection function of the pectines in the Central American
scorpion Centruroides margaritatus. Experimental behavior tests
were performed to compare prey detection skills of scorpions with or
without alteration of the pectines using an experimental setup. Sixty
mature females were assigned randomly to four groups of similar size.
The groups include three treatments (application of paraffin, cutting
of a pectine and cutting both pectines) and a control group (pectines
intact). There was no significant difference in the time of reaction and
prey detection between treatments and group control. The frequencies
of the behaviors in each treatment differ with those of the control. The
modification of the structure suggests a qualitative effect on the capacity
to locate prey. The results are discussed in terms of the functionality of
the pectines to detect prey. Other receptors (such as trichobothria, tarsal
and basitarsal organs) located in pedipalps and legs of the scorpion C.
margaritatus are possibly more important to perceive substrate-borne
vibrations from the prey.
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