Evidence for aposematic coloration of the sea urchin Astropyga pulvinata


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Citation
Evidence for aposematic coloration of the sea urchin Astropyga pulvinata

Material Information

Title:
Evidence for aposematic coloration of the sea urchin Astropyga pulvinata
Translated Title:
Evidencia para coloración aposemático del erizo del mar Astropyga pulvinata
Creator:
Howell, Nathan
Publication Date:
Language:
Text in English

Subjects

Subjects / Keywords:
Sea urchins--Behavior ( lcsh )
Erizos de mar--comportamiento ( lcsh )
EAP Fall 2017
EAP Otoño 2017
Costa Rica--Guanacaste--Cuajiniquil
Costa Rica--Guanacaste--Cuajiniquil
Genre:
Reports

Notes

Abstract:
Astropyga pulvinata is a brightly colored urchin found in some tropical pacific waters including the coast of Costa Rica. The aim of this study was to test a possible explanation for the coloration of A. pulvinata. I tested the hypothesis that the coloration of A. pulvinata is aposematic. I tested this by poking A. pulvinata and another species of urchin, the uniformly black Diadema mexicanum, then comparing their reactions. The results indicated that A. pulvinata were more likely to move as a response to the poking stimulus than D. mexicanum, which was contrary to the predicted hypothesis. 100% of A. pulvinata urchins moved after being poked, but only 60% of D. mexicanum urchins moved. However, after further investigation and observations, this behavior does not disprove the warning coloration hypothesis. Another test involved placing both species of urchin in the feeding garden of the territorial giant damselfish. The results showed that the damselfish bit D. mexicanum significantly more than A. pulvinata. After 9 trials with 120 minutes of video, damselfish bit D. mexicanum a total of 314 times and A. pulvinata only twice. The best explanation for such behavior is that A. pulvinata exhibits aposematic coloration. ( ,, )
Abstract:
Astroypyga pulvinata es un erizo de mar de coloración brillante que se encuentra en el océano pacifico, incluyendo la costa de Costa Rica. El objetivo de este estudio fue probar una posible explicación de la coloración de A. pulvinata. Probé la hipótesis que la coloración de A. pulvinata es aposemático. Para probarlo, empujé el erizo con un palo y comparé la reacción de este erizo contra otra especie, el erizo negro, Diadema mexicanum. Los resultados indican que A. pulvinata se movió más que D. mexicanum después del estímulo, que fue el opuesto de la hipótesis. Cien porciento de los A. pulvinata se movieron, pero solamente 60% de los D. mexicanum se movieron. Sin embargo, después de más investigación y observación, este comportamiento no refuta la hipótesis que la coloración es aposemático. Para otra prueba, puse las dos especies dentro del territorio de un pez, la jaqueta gigante, y observé la reacción del pez. Los resultados mostraron que la jaqueta gigante mordió las espinas de D. mexicanum mucho más que las espinas de A. pulvinata. El pez mordió las espinas de D. mexicanum 314 veces y solamente mordió las espinas de A. pulvinata dos veces. La mejor explicación mejor por este comportamiento es que la coloración de A. pulvinata es aposemático.
Biographical:
Student affiliation: Department of Physics and Astronomy, University of California Los Angeles.

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Source Institution:
Monteverde Institute
Holding Location:
Monteverde Institute
Rights Management:
This item is licensed with the Creative Commons Attribution Non-Commercial No Derivative License. This license allows others to download this work and share them with others as long as they mention the author and link back to the author, but they can’t change them in any way or use them commercially.
Resource Identifier:
M39-00645 ( USFLDC DOI )
m39.645 ( USFLDC Handle )

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PAGE 10

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