Tropical Ecology and Conservation [Monteverde Institute]

Alternative Title

Microhongos del suelo en el paisaje forestal-agrícola de San Luis, Costa Rica

Creator

Ellyn Yakowenko

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Publication Date

November 2004

Abstract

Soil microfungi are known to play key roles in ecosystem function and are often the first indicators of a breakdown in stability (Volk 2001). This study compares soil microfungal abundance and diversity across a tropical human land use gradient in the San Luis valley of Costa Rica. Microfungi were cultured from soil samples collected from primary forest, secondary forest, pasture, and coffee farm sites using the Soil Dilution Plate Technique (Christensen 2001). Thirty-six soil samples yielded a total of 17,321 isolates of 41 different morphological species. Each habitat type was characterized by the dominance of a few abundant species while the rest of the community was comprised of an extensive number of ‘rare’ species. Differences in species richness and diversity across habitats were found to be statistically significant: secondary forest sites were found to be the most diverse (H’= 2.213, S = 33), followed by coffee farm (H’= 1.113, S = 24), pasture (H’= 0.506, S = 21), and primary forest sites (H’= 0.314, S = 26), respectively. In contrast to previous studies on microfungal diversity (Cabello and Arambarri 2002), this study determined that intermediate to high levels of soil disturbance caused by human land use actually may facilitate microfungal diversity in the tropics, instead of hindering it. Se sabe que los microhongos del suelo juegan un papel clave en la función de los ecosistemas y a menudo son los primeros indicadores de estrés (Volk 2001). Este estudio compara la abundancia y la diversidad de los microhongos en una gradiente de uso humano en el valle de San Luis, Costa Rica. Los microhongos fueron cultivados a partir de muestras de suelo recogidas en bosques primarios, bosques secundarios, potreros y cafetales usando el Soil Dilution Plate Technique (Christensen 2001). Treinta y seis muestras de suelo produjeron 17,321 aislados de 41 especies morfológicos diferentes. Cada tipo de hábitat estuvo caracterizado por la dominancia de unas cuantas especies abundantes, mientras que el resto de la comunidad estuvo constituido de un número extenso de especies ‘raras’. Las diferencias en la riqueza y diversidad de las especies entre los hábitats fueron estadísticamente significativas: los sitios de bosque secundario fueron los más diversos (H’= 2.213, S = 33), seguidos por los cafetales (H’= 1.113, S = 24), los potreros (H’= 0.506, S = 21) y los bosques primarios (H’= 0.314, S = 26), respectivamente. En contraste con estudios anteriores sobre la diversidad de microhongos (Cabello and Arambarri 2002), este encontró que las perturbaciones del suelo de nivel intermedio a alto causadas por el uso humano en efecto incrementan la diversidad de los microhongos en los trópicos, en vez de disminuirla.

Keywords

Microfungi, Microhongos, Soils Composition, Composicion del suelo, Habitat fragmentation, Fragmentacion del habitat, Costa Rica--Puntarenas--Monteverde Zone--San Luis, Costa Rica--Puntarenas--Zona de Monteverde--San Luis, CIEE Fall 2004, CIEE Otoño 2004

Description

Student affiliation : Department of Biology, Saint Mary's Honors College of Maryland Born Digital

Subject: topical

Microfungi; Microhongos; Soils Composition; Composicion del suelo; Habitat fragmentation; Fragmentacion del habitat; CIEE Fall 2004; CIEE Otoño 2004

Subject: geographic

Costa Rica--Puntarenas--Monteverde Zone--San Luis; Costa Rica--Puntarenas--Zona de Monteverde--San Luis

Genre

Reports

Holding Location

Monteverde Institute MVI

Identifier

M39-00189

Soil microfungi in the forest-agricultural landscape of San Luis, Costa Rica

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