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Effects of the Surrounding Matrix on Tree Recruitment in Amazonian Forest Fragments

Authors

  • HENRIQUE E. M. NASCIMENTO,

    Corresponding author
    1. Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research (INPA), C.P. 478, Manaus, AM 69011-970, Brazil
      § email henrique@inpa.gov.br
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  • ANA C. S. ANDRADE,

    1. Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research (INPA), C.P. 478, Manaus, AM 69011-970, Brazil
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  • JOSÉ LUÍS C. CAMARGO,

    1. Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research (INPA), C.P. 478, Manaus, AM 69011-970, Brazil
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  • WILLIAM F. LAURANCE,

    1. Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research (INPA), C.P. 478, Manaus, AM 69011-970, Brazil
    2. Smithsonian Tropical Research Institute, Apartado 2072, Balboa, Republic of Panama
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  • SUSAN G. LAURANCE,

    1. Smithsonian Tropical Research Institute, Apartado 2072, Balboa, Republic of Panama
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  • JOSÉ EDUARDO L. RIBEIRO

    1. Department of Botany, National Institute for Amazonian Research (INPA), C.P. 478, Manaus, AM 69011-970, Brazil
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§ email henrique@inpa.gov.br

Abstract

Abstract: Little is known about how the surrounding modified matrix affects tree recruitment in fragmented forests. We contrasted effects of two different matrix types, Vismia- and Cecropia-dominated regrowth, on recruitment of pioneer tree species in forest fragments in central Amazonia. Our analyses were based on 22, 1-ha plots in seven experimental forest fragments ranging in size from 1 to 100 ha. By 13 to 17 years after fragmentation, the population density of pioneer trees was significantly higher in plots surrounded by Vismia regrowth than in plots surrounded by Cecropia regrowth, and the species composition and dominance of pioneers differed markedly between the two matrix types. Cecropia sciadophylla was the most abundant pioneer in fragments surrounded by Cecropia regrowth (constituting nearly 50% of all pioneer trees), whereas densities of species in Vismia-surrounded fragments were distributed more evenly. Thus the surrounding matrix had a strong influence on patterns of tree recruitment in Amazonian forest fragments.

Abstract

Resumen: Se conoce poco del efecto de la matriz modificada circundante sobre el reclutamiento de árboles en bosques fragmentados. Contrastamos los efectos de dos tipos diferentes de matriz, vegetación secundaria dominada por Vismia- y Cecropia-, sobre el reclutamiento de especies de árboles pioneros en fragmentos de bosque en la Amazonía central. Nuestros análisis se basaron en 22 parcelas de 1 ha en siete fragmentos de bosque experimentales que varían entre 1 y 1000 ha. Entre 13 y 17 años después de la fragmentación, la densidad poblacional de árboles pioneros era significativamente mayor en parcelas rodeados por Vismia que en las parcelas rodeadas por Cecropia, y la composición y dominancia de especies pioneras fueron marcadamente diferentes en cada tipo de matriz. Cecropia sciadophylla fue la pionera más abundante en fragmentos rodeados por Cecropia (constituyó casi 50% de todos los árboles pioneros), mientras que las densidades de especies en los fragmentos rodeados por Vismia se distribuyeron más homogéneamente. Por lo tanto, la matriz circundante tiene una fuerte influencia sobre los patrones de reclutamiento de árboles en fragmentos de bosque Amazónicos.

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