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Forests 2016, 7(11), 277; doi:10.3390/f7110277

Resource Utilization by Native and Invasive Earthworms and Their Effects on Soil Carbon and Nitrogen Dynamics in Puerto Rican Soils

1
Odum School of Ecology, University of Georgia, Athens, GA 30602, USA
2
Department of Biology, University of North Georgia, Dahlonega, GA 30597, USA
3
USDA Forest Service, International Institute of Tropical Forestry, Jardín Botánico Sur, 1201 Ceiba St., Río Piedras 00926, Puerto Rico
*
Author to whom correspondence should be addressed.
Academic Editors: Scott X. Chang and Xiangyang Sun
Received: 22 September 2016 / Revised: 5 November 2016 / Accepted: 6 November 2016 / Published: 15 November 2016
(This article belongs to the Special Issue Nutrient Cycling and Plant Nutrition in Forest Ecosystems)
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Abstract

Resource utilization by earthworms affects soil C and N dynamics and further colonization of invasive earthworms. By applying 13C-labeled Tabebuia heterophylla leaves and 15N-labeled Andropogon glomeratus grass, we investigated resource utilization by three earthworm species (invasive endogeic Pontoscolex corethrurus, native anecic Estherella sp, and native endogeic Onychochaeta borincana) and their effects on soil C and N dynamics in Puerto Rican soils in a 22-day laboratory experiment. Changes of 13C/C and 15N/N in soils, earthworms, and microbial populations were analyzed to evaluate resource utilization by earthworms and their influences on C and N dynamics. Estherella spp. utilized the 13C-labeled litter; however, its utilization on the 13C-labeled litter reduced when cultivated with P. corethrurus and O. borincana. Both P. corethrurus and O. borincana utilized the 13C-labeled litter and 15C-labeled grass roots and root exudates. Pontoscolex corethrurus facilitated soil respiration by stimulating 13C-labeled microbial activity; however, this effect was suppressed possibly due to the changes in the microbial activities or community when coexisting with O. borincana. Increased soil N mineralization by individual Estherella spp. and O. borincana was reduced in the mixed-species treatments. The rapid population growth of P. corethrurus may increase competition pressure on food resources on the local earthworm community. The relevance of resource availability to the population growth of P. corethrurus and its significance as an invasive species is a topic in need of future research. View Full-Text
Keywords: carbon and nitrogen mineralization; invasive earthworms; Luquillo mountains; microbial respiration; Puerto Rico; stable isotope; tropics carbon and nitrogen mineralization; invasive earthworms; Luquillo mountains; microbial respiration; Puerto Rico; stable isotope; tropics
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Huang, C.-Y.; González, G.; Hendrix, P.F. Resource Utilization by Native and Invasive Earthworms and Their Effects on Soil Carbon and Nitrogen Dynamics in Puerto Rican Soils. Forests 2016, 7, 277.

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