Earthworm functional traits, landscape degradation and ecosystem services in the Brazilian Amazon deforestation arc

Marichal Raphaël, Praxedes Catarina, Decaëns Thibaud, Grimaldi Michel, Oszwald Johan, Brown George G., Desjardins Thierry, Lopes Da Silva Mario Junior, Feijoo Alexander, Oliveira Mariana N.D., Velasquez Elena, Lavelle Patrick. 2017. Earthworm functional traits, landscape degradation and ecosystem services in the Brazilian Amazon deforestation arc. European Journal of Soil Biology, 83 : 43-51.

Quartile : Q2, Sujet : ECOLOGY / Quartile : Q3, Sujet : SOIL SCIENCE

Résumé : Earthworms, as ecosystem engineers, help to mineralize soil organic matter, construct and maintain soil structure, and often stimulate plant growth and protect plants from pests. The aim of this study was (i) to determine the connection between earthworm traits and indicators of soil ecosystem services and (ii) to identify earthworm “response” traits, which are selected by the landscape or changes in the soil, and “effect” traits, which contribute to soil processes. In the southern portion of the state of Parà (eastern Brazilian Amazonia), we sampled earthworms at 135 points distributed among 3 locations, 9 sub-locations and 27 farms (5 sampling points per farm). At each point, three 25 cm × 25 cm soil samples were hand-sorted for earthworms. We measured eight functional traits in 1148 individuals: relative gizzard size, type of typhlosole, length and type of caudal setae, pigmentation, overall length, thickness of septa and musculature in anterior segments. We found a significant, although relatively low, relationship between landscape classes and trait proportions. Earthworm trait proportions significantly covaried with soil parameters and indicators of soil ecosystem services. We did not find significant covariation between earthworm morphospecies and soil ecosystem services. We identified earthworm “response” traits that had been selected and assessed consequences of these changes on effects of earthworm communities (via their “effect” traits) on soil processes and ecosystem services. Typhlosole type, gizzard size and septa thickness were identified as “response” traits selected by soil and landscape conditions. These traits were also identified as “effect” traits for their influence on soil structure. Results indicated a connection between earthworm traits and landscape degradation and soil services, which is a new step toward conceptualizing earthworm ecological studies that go beyond the species level.

Mots-clés Agrovoc : forêt, forêt tropicale, déboisement, ver de terre, fertilité du sol, matière organique du sol, croissance, résistance aux facteurs nuisibles, résistance aux organismes nuisibles, reconstitution forestière, régénération naturelle

Mots-clés géographiques Agrovoc : Brésil

Classification Agris : P34 - Biologie du sol
K01 - Foresterie - Considérations générales
F40 - Écologie végétale
000 - Autres thèmes

Champ stratégique Cirad : Axe 6 (2014-2018) - Sociétés, natures et territoires

Auteurs et affiliations

• Marichal Raphaël, CIRAD-PERSYST-UPR Systèmes de pérennes (IDN) ORCID: 0000-0001-9070-5749
• Praxedes Catarina, MPEG (BRA)
• Decaëns Thibaud, UM2 (FRA)
• Grimaldi Michel, IRD (FRA)
• Oszwald Johan, Université de Haute-Bretagne (FRA)
• Brown George G., EMBRAPA (BRA)
• Desjardins Thierry, IRD (FRA)
• Lopes Da Silva Mario Junior, UFRA (BRA)
• Feijoo Alexander, Universidad Tecnológica de Pereira (COL)
• Oliveira Mariana N.D., UFRA (BRA)
• Velasquez Elena, Universidad Nacional de Colombia (COL)
• Lavelle Patrick, IRD (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/585788/)

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