title: Recovery of Forest and Phylogenetic Structure in Abandoned Cocoa Agroforestry in the Atlantic Forest of Brazil.
abstract: Cocoa agroforests like the cabrucas of Brazil's Atlantic forest are among the agro-ecosystems with greatest potential for biodiversity conservation. Despite a global trend for their intensification, cocoa agroforests are also being abandoned for socioeconomic reasons especially on marginal sites, because they are incorporated in public or private protected areas, or are part of mandatory set-asides under Brazilian environmental legislation. However, little is known about phylogenetic structure, the processes of forest regeneration after abandonment and the conservation value of former cabruca sites. Here we compare the vegetation structure and composition of a former cabruca 30-40 years after abandonment with a managed cabruca and mature forest in the Atlantic forest region of Espirito Santo, Brazil. The forest in the abandoned cabruca had recovered a substantial part of its original structure. Abandoned cabruca have a higher density (mean ± CI95 %: 525.0 ± 40.3 stems per ha), basal area (34.0 ± 6.5 m2per ha) and species richness (148 ± 11.5 species) than managed cabruca (96.0 ± 17.7; 24.15 ± 3.9 and 114.5 ± 16.0, respectively) but no significant differences to mature forest in density (581.0 ± 42.2), basal area (29.9.0 ± 3.3) and species richness (162.6 ± 15.5 species). Thinning (understory removal) changes phylogenetic structure from evenness in mature forest to clustering in managed cabruca, but after 30-40 years abandoned cabruca had a random phylogenetic structure, probably due to a balance between biotic and abiotic filters at this age. We conclude that abandoned cocoa agroforests present highly favorable conditions for the regeneration of Atlantic forest and could contribute to the formation of an interconnected network of forest habitat in this biodiversity hotspot.
authors.affiliation: Laboratório de Restinga e Floresta Atlântica, Universidade Federal do Espírito Santo, São Mateus, 29932-540, ES, Brazil. sgrolim@gmail.com.
authors.forename: Samir Gonçalves
authors.identifier: 0000-0002-9962-8708
authors.initials: SG
authors.lastname: Rolim
authors.affiliation: Institute of Applied Economic Research, Brasília, 70076-900, DF, Brazil.
authors.forename: Regina Helena Rosa
authors.initials: RH
authors.lastname: Sambuichi
authors.affiliation: C.P. 513, Santarém, 68109-971, PA, Brazil.
authors.forename: Götz
authors.initials: G
authors.lastname: Schroth
authors.affiliation: Laboratório de Ciências Ambientais, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, 28013-602, RJ, Brazil.
authors.forename: Marcelo Trindade
authors.initials: MT
authors.lastname: Nascimento
authors.affiliation: Departamento de Ciências Biológicas, Universidade Federal do Espírito Santo, Vitoria, 29060900, ES, Brazil.
authors.forename: José Manoel Lucio
authors.initials: JM
authors.lastname: Gomes
mesh_terms: D044822:Biodiversity; D001938:Brazil; D002099:Cacao / Q000254:growth & development*; D003247:Conservation of Natural Resources / Q000379:methods* / Q000639:trends; D017753:Ecosystem; D016468:Forestry / Q000379:methods* / Q000639:trends; D065928:Forests; D010802:Phylogeny; D014197:Trees / Q000254:growth & development*
keywords: Diversity recovery; Forest regeneration; Human-modified ecosystems; Land-use effects