Tropical Ecology and Conservation [Monteverde Institute]

Creator

Elizabeth Green

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Publication Date

September 2000

Abstract

This experiment compared communities of ground-dwelling insects in gaps and closed canopy forest in the elfin forest of the Estación Biológica Monteverde in Puntarenas, Costa Rica. Insects were trapped with pitfall traps in six gaps and adjacent forest areas in October and November 2000. Shannon-Weiner Diversity indices, Margalef species richness indices, evenness (H’ /(In S)), mean abundance per site, and Morisita Similarity indices were compared. Diversity differed only for Coleopterans, which were more diverse in gaps (H’ = 1.201) than in forest (H’ = 0.8387; modified t-test t= 1.979, p < 0.001). The Margalef index of species richness did not vary between paired gap and forest sites for total insects captured, but was significantly higher for Coleopterans in the gaps than in the forest (sign test, a level 0.05). Coleopterans also had greater evenness in gaps than in forest (sign test, a level 0.05). Mean abundances in gap (8.04 +/- 7.669 mean number of insects/trap) and forest (5.09 +/- 3.191 insects/trap) sites were not different. The Morisita Similarity index was 0.4846, with 47.05% of ground-dwelling insect morphospecies shared between gaps and closed forest. Perhaps conditions in gaps and closed canopy areas in this forest are sufficiently different to allow specialization by ground-dwelling insects to one or the other habitat type. Este experimento comparo las comunidades de insectos que viven en la tierra en los espacios de arboles caídos y en la sombra en el bosque de los duendes en la Estación Biológica Monteverde, Puntarenas, Costa Rica. Atrape los insectos con trampas en seis espacios y en el bosque adyacente en octubre y noviembre 2000. Compare los índices de la diversidad Shannon-Weiner, los índices de riqueza de las especies Margalef, la igualdad (H’/(In S)), la abundancia promedia y los índices de la similitud Morisita. La diversidad estuvo diferente solamente por el orden Coleoptera, que estuvo mas diverso en los espacios (H’ = 1.201) que en el bosque (H’ = 0.8387; prueba t-modificado t= 1.979, p < 0.001). El índice Margalef no vario entre los sitios de los espacios y el bosque pero estuvo de manera significativa mayor por la Coleoptera en los espacios que en el bosque (prueba signo, nivel a 0.05). Las abundancias promedias en los espacios y en el bosque no estuvieron diferentes. El índice Moricita estuvo 0.4846 y 47.05% de las especies de insectos fueron compartidos entre los espacios y el bosque. Es posible que las condiciones de estos lugares sean diferentes suficientemente para permitir la especialización de los insectos en cada uno.

Description

Student affiliation: Colleges of Natural Science and Liberal Arts, University of Texas, Austin Texas Digitized by MVI

Genre

Reports

Holding Location

Monteverde Institute MVI

Identifier

M39-00039

A comparison of ground-dwelling insect communities in gaps and closed canopy forest in the elfin forest of Monteverde, Costa Rica

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