Separating the Effects of Forest Type and Elevation on the Diversity of Litter Invertebrate Communities in a Humid Tropical Forest in Puerto Rico

• Published in: The Journal of animal ecology Vol. 74; no. 5; pp. 926 - 936
• Main Authors: Richardson, Barbara A., Richardson, Michael J., Soto-Adames, Felipe N.
• Format: Journal Article
• Language: English
• Published: Oxford, UK British Ecological Society 01.09.2005; Blackwell Science Ltd; Blackwell; Blackwell Publishing Ltd
• Subjects: Animal and plant ecology; Animal ecology; Animal, plant and microbial ecology; Animals; Biodiversity; Biological and medical sciences; Biomass; Climate; Climatic conditions; Coleoptera; Communities; Elevation; Forest ecology; Forest litter; Forests; Fundamental and applied biological sciences. Psychology; General aspects; Heterogeneity; Hurricanes; Invertebrata; Invertebrates; Isoptera; Leaching; Leaves; Litter; microcosms; microhabitats; Mountains; nutrients; Species diversity; Species richness; Trees; Tropical forests; Tropical rain forests; Central America; Puerto Rico; America; West Indies; United States > US; Luquillo Mountains; Microhabitat; Litter; Microcosm; Tropical forest; Biomass; microcosms; Biodiversity; nutrients; microhabitats; Nutrient; Habitat; Invertebrata; Community; Species richness
• ISSN: 0021-8790; 1365-2656
• DOI: 10.1111/j.1365-2656.2005.00990.x

1. The primary effects of climatic conditions on invertebrate litter communities, and the secondary effects of different forest types, were distinguished by using the sierra palm as a control in a natural experiment along an elevational gradient in the Luquillo Mountains. These mountains have three well-defined forest types along the gradient, with the palm occurring as stands within each forest. 2. Palm litter samples were richer in nutrients, particularly phosphorus, than nonpalm litter, significantly so at higher elevations where leaching would have been expected. In nonpalm litter, mineral concentrations were significantly lower at higher elevations. 3. Animal abundance mirrored the pattern of mineral amounts and declined significantly in mid- and high-altitude forests, but did not decline with increasing elevation in palm stands. A pulse of post-hurricane litterfall was reflected in the high abundance of Coleoptera and Isoptera the following year. 4. The species richness of communities (Margalef's index) declined with increasing elevation in nonpalm forest litter, but was remarkably similar in palm litter at all elevations. 5. Palm litter communities were more similar to each other (Sørensen's index) than nonpalm communities, which became less similar with increasing elevation. 6. The differences observed from the lower slopes to the summits, in animal abundance, species richness and the uniformity of communities, are better explained by the contribution of forest composition to the chemical and physical nature of litter and forest heterogeneity, rather than to direct effects of temperature and rainfall differences.