flutuações temporais nos padrões de distribuição diamétrica da comunidade arbóreo-arbustivo e de 15 populações em um fragmento florestal temporal fluctuations in the diametric distribution patterns of the trees and shrub community and 15 populations in a forest fragment
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2010
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Abstract
Objetivando caracterizar possíveis flutuações nos padrões de distribuição diamétrica foram analisadas, num intervalo de cinco anos (2000-2005), a comunidade e as populações das 15 espécies mais abundantes do compartimento arbóreo de um remanescente de Floresta Semidecídua. A distribuição diamétrica da comunidade apresentou alta concentração nas classes menores e diminuição acentuada no sentido das maiores (J-invertido), em ambos os inventários. As populações apresentaram padrões distintos, arbitrariamente distribuídos em dois grupos: Grupo 1, formado por espécies de menor porte e abundantes no sub-bosque, como Galipea jasminiflora, Allophylus edulis, Sebastiania commersoniana, Dendropanax cuneatus e Mollinedia widgrenii, e também espécies de árvores altas e pioneiras, como Acacia polyphylla e Piptadenia gonoacantha, cujas distribuições diamétricas seguiram o modelo J-invertido. Com exceção de Calycorectes acutatus, todas as demais espécies do Grupo 2 (Platycyamus regnellii, Cupania vernalis, Machaerium stipitatum, Machaerium villosum, Copaifera langsdorffii, Persea major e Cassia ferruginea) eram de maior porte, cujos adultos predominavam no dossel da floresta, elevando a área basal e apresentando densidade de indivíduos menor nas classes diamétricas inferiores. No intervalo considerado, apenas D. cuneatus alterou seu padrão de distribuição (Grupo 1-Grupo 2), enquanto as demais os acentuaram. No Grupo 1, a síndrome de dispersão preferencial era anemocórica ou autocórica, ao passo que no Grupo 2 predominava a zoocoria. Assim, o remanescente, por apresentar área pequena, forma alongada e localização semiurbana associada a um regime de intensas perturbações, pode ter ocasionado empobrecimento da fauna dispersora, prejudicando a taxa de recrutamento.
Aiming to characterize possible fluctuations in the patterns of diametric distribution, the community and the populations of the 15 most abundant tree species in a fragment of semideciduous forest were analyzed in a five year interval (2000-2005). The diametric distribution of the community showed a high concentration in the smaller classes and accentuated reduction in the biggest classes (reverse-J-shape), for both surveys. The populations presented different patterns, randomly distributed in two groups. Group1, formed by species of smaller diameters and abundant in the sub-canopy, such as Galipea jasminiflora, Allophylus edulis, Sebastiania commersoniana, Dendropanax cuneatus and Mollinedia widgrenii, and also by pioneer species of high trees, Acacia polyphylla and Piptadenia gonoacantha followed the reverse-J-shape curve diametric distributions . All species of Group2 (Platycyamus regnellii, Cupania vernalis, Machaerium stipitatum, Machaerium villosum, Copaifera langsdorffii, Persea major and Cassia ferruginea) except Calycorectes acutatus, present bigger diameters, and their individual adults predominate in the forest canopy, increasing the basal area and presenting a density of smaller individuals in the lower diametric classes. In the evaluated interval, only D. cuneatus altered their distribution pattern (Group1-Group2), while the others increased. In Group1 the main dispersion syndrome is anemochory or autochory, while in Group2 the zoochory syndrome predominates. As the fragment presents a small area, elongated form and semi-urban location associated to a regime of intense disturbances, which may have caused a decrease of the fauna disperseres, compromising the recruitment rate.
Aiming to characterize possible fluctuations in the patterns of diametric distribution, the community and the populations of the 15 most abundant tree species in a fragment of semideciduous forest were analyzed in a five year interval (2000-2005). The diametric distribution of the community showed a high concentration in the smaller classes and accentuated reduction in the biggest classes (reverse-J-shape), for both surveys. The populations presented different patterns, randomly distributed in two groups. Group1, formed by species of smaller diameters and abundant in the sub-canopy, such as Galipea jasminiflora, Allophylus edulis, Sebastiania commersoniana, Dendropanax cuneatus and Mollinedia widgrenii, and also by pioneer species of high trees, Acacia polyphylla and Piptadenia gonoacantha followed the reverse-J-shape curve diametric distributions . All species of Group2 (Platycyamus regnellii, Cupania vernalis, Machaerium stipitatum, Machaerium villosum, Copaifera langsdorffii, Persea major and Cassia ferruginea) except Calycorectes acutatus, present bigger diameters, and their individual adults predominate in the forest canopy, increasing the basal area and presenting a density of smaller individuals in the lower diametric classes. In the evaluated interval, only D. cuneatus altered their distribution pattern (Group1-Group2), while the others increased. In Group1 the main dispersion syndrome is anemochory or autochory, while in Group2 the zoochory syndrome predominates. As the fragment presents a small area, elongated form and semi-urban location associated to a regime of intense disturbances, which may have caused a decrease of the fauna disperseres, compromising the recruitment rate.
| Reference Key |
machado2010revistaflutuaes
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| Authors | ;Evandro Luiz Mendonça Machado;Anne Priscila Dias Gonzaga;Warley Augusto Caldas Carvalho;Josival Santos Souza;Pedro Higuchi;Rubens Manoel dos Santos;Ana Carolina da Silva;Ary Teixeira de Oliveira-Filho |
| Journal | journal of veterinary medical research |
| Year | 2010 |
| DOI |
10.1590/S0100-67622010000400017
|
| URL | |
| Keywords | Keywords not found |
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