Tropical Ecology and Conservation [Monteverde Institute]

Alternative Title

Los mecanismos de defensa de Nyssodesmus python (Polydesmidae)

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Publication Date

August 2005

Abstract

The purpose of this study was to examine the effects different characteristics of Nyssodesmus python had on the defense mechanisms of the organism. The defense mechanisms of N. python include: curling into a spiral and chemical defense. It was predicted that sex would not affect defense mechanisms, whereas size and level of calcification would. Populations were found in two locations: La Estación Biológica Monteverde and San Gerardo on different sides of the continental divide. One hundred and twenty millipedes were collected, 42 in Monteverde and 78 in San Gerardo. They were artificially threatened, and the time spent in a protective position and the release of toxin were recorded. The size of the individuals and level of calcification were also recorded. T-tests and chi-squared tests showed that there were significant differences in the defense mechanisms of males and females. Regression analysis showed a significant trend between size of an individual and the time it remained in the protected position, but the relationship may not be due to causation. The millipedes of different populations had some distinctive morphological and behavioral characteristics; additionally, there was a significant difference in their length of time spent in a curled position. El objetivo de este estudio fue examinar los efectos de las diferentes características de Nyssodesmus python sobre los mecanismos de defensa de estos organismos. Los mecanismos de defensa de N. python incluyen: doblarse sobre sí mismos y la defensa química. Se predijo que el sexo no afectaría a los mecanismos de defensa, mientras el tamaño y el nivel de calcificación si lo harían. Los individuos se encontraron en dos lugares: La Estación Biológica Monteverde y San Gerardo, en lados diferentes de la división continental. Ciento veinte milpiés se estudiaron en total, 42 en Monteverde y 78 en San Gerardo. Se amenazaron artificialmente, y se registraron el tiempo que pasaron en una posición protectora y la presencia de la secreción de toxinas. También se anotaron el tamaño de los individuos y el nivel de calcificación. Los experimentos indicaron una relación significativa entre el sexo de un milpiés y sus mecanismos de defensa. El análisis de regresión mostró una relación significativa entre el tamaño del individuo y el tiempo que pasó en una posición protectora. Los milpiés de poblaciones diferentes mostraron diferencias morfológicas y características etológicas; hubo una diferencia significativa en el tiempo en que permanecieron en una posición protectora.

Keywords

Millipedes, Milpies, Animal defenses, Defensas animales, Monteverde Biological Station (Costa Rica), Estacion Biologica de Monteverde (Costa Rica), Costa Rica--Puntarenas--Monteverde Zone-San Gerardo, Costa Rica--Puntarenas--Zona de Monteverde-San Gerardo, CIEE Summer 2005, CIEE Verano 2005

Description

Student Affiliation : Pott College of Science and Engineering, University of Southern Indiana Born Digital

Subject: topical

Millipedes; Milpies; Animal defenses; Defensas animales; CIEE Summer 2005; CIEE Verano 2005

Subject: geographic

Monteverde Biological Station (Costa Rica); Estacion Biologica de Monteverde (Costa Rica); Costa Rica--Puntarenas--Monteverde Zone-San Gerardo; Costa Rica--Puntarenas--Zona de Monteverde-San Gerardo

Genre

Reports

Holding Location

|Monteverde Institute MVI

Identifier

M39-00243

Defense mechanisms of Nyssodesmus python (Polydesmidae)

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