Espécies de Cecropia da Amazônia Brasileira ()

Berg, C.C.

doi:10.1590/1809-43921978082149

Cited by 29 publications

(18 citation statements)

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“…Constituem um sítio imprescindível para a regeneração das espécies intolerantes à sombra, as quais ocorrem em todas florestas tropicais (Berg 1978, Vazquez-Yanes & Sada 1985, Whitmore 1990). Hartshorn (1978) estimou que 50% das árvores de La Selva, Costa Rica, dependem de clareiras para obter êxito na regeneração.…”

Section: Introductionunclassified

Colonização de clareiras naturais na floresta atlântica no sudeste do Brasil

Tabarelli¹,

Mantovani²

1997

Rev. bras. Bot.

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Colonização de clareiras naturais na floresta atlântica no sudeste do Brasil) were more abundant, comprising the largest area covering this type of disturbance (100-66%). Treefall gaps shown a common colonization pattern, where shade tolerant species were more abundant and frequent than shade intolerant ones. Relationships between gap area, guild composition and abundance of dominant species were not observed. The results suggest that the Atlantic forest has a reduced richness of shade intolerant species, mainly the large pioneer ones. The gap area is not the best predictor of floristic and ecological composition in treefall gaps.RESUMO -(Colonização de clareiras naturais na floresta Atlântica no sudeste do Brasil). Em duas florestas na encosta atlântica no sudeste do Brasil, foi analisada a colonização vegetal de 23 clareiras naturais (34-256 m 2 ). Nos dois locais de estudo, as clareiras pequenas foram as mais abundantes, cobrindo a maior parte da superfície ocupada por este tipo de perturbação (100-66%). As clareiras apresentaram padrão comum de colonização, caracterizado pela dominância de indivíduos e espécies tolerantes à sombra, principalmente aquelas de sub-bosque. Não observou-se relação entre tamanho das clareiras, composição de guildas de regeneração e a abundância das espécies dominantes. Os resultados sugerem que a floresta atlântica possui riqueza reduzida de espécies intolerantes à sombra, principalmente as grandes pioneiras, que são pouco abundantes e pouco freqüentes. O tamanho não é o melhor preditor da composição florística e ecológica das clareiras.

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Section: Introductionunclassified

Colonização de clareiras naturais na floresta atlântica no sudeste do Brasil

Tabarelli¹,

Mantovani²

1997

Rev. bras. Bot.

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“…11 regroupe une centaine d'especes (Berg, 1978) dont Ia plupart sont des myrmecophytes associes le plus souvent aux fourmis A::teca. Elles se repartissent du sud du Mexique au nord de !…”

Section: Introductionunclassified

La fonction myrmécophile deCecropia obtusaTrecul (Cecropiaceae) en Guyane française

Belin-Depoux

Solano

Lubrano

et al. 1997

Acta Botanica Gallica

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Resume.-Cecropia obtusa Trecul est un myrmecophyte associe dans une relation stricte avec les fourmis Azteca (A. alfari Emery et A. traili Emery). Ces dernieres occupent les entre-nceuds de l'arbre et se nourrissent des corps nourriciers ou corps de Muller, corpuscules pluricellulaires produits a Ia base du petiole de chaque feuille fonctionnelle a partir d'un tissu particulier, le trichilium. L'activite de production des corps mulleriens est liee a celle des fourmis et se situe dans les trois heures precedant Ia fin du jour. Une chenille Phycitinae peut egalement occuper le Cecropia et consommer exclusivement les corps nourriciers landis qu'un champignon Fusarium moniliforme parasite le trichilium en !'absence des fourmis. La distribution de Cecropia obtusa, espece pionniere, est homogene dans l'espace et dans le temps, mais sa dynamique de croissance est sous controle des facteurs topographiques, edaphiques et climatiques. La comparaison entre les individus occupes par les fourmis et ceux qui ne le son! pas montre que ces derniers se developpent moins vile et produisent moins de corps nourriciers. Le comportement des Cecropia cultives en serre rejoin! celui des individus inoccupes du milieu naturel avec cependant une production plus elevee de corps nourriciers. Lorsque les chenilles occupent Ia plante, le nombre des corps nourriciers produits est plus grand que celui des individus inoccupes. Le role des fourmis et des chenilles dans Ia dynamique de developpement et Ia production des corps nourriciers est discute. L'analyse chimique partielle du corps nourricier montre une nette dominance du glycogene auquel s'ajoutent des sucres simples, des lipides, des proteines et Ia presence des vitamines C et E. Les differences constatees entre Ia composition des corps mulleriens du milieu naturel et celle des corps nourriciers produits en serre sont discutees. L'examen histologique et cytologique du corps de Muller a permis de mettre en evidence son ontogenese et l'origine des principales substances synthetisees ayant un role trophique pour les fourmis et les chenilles. SummmJ 1 .-Cecropia obtusaTrecul is a myrmecophytic plant associated in a strict relation with the ants Azteca (A. alfari Emery and A. traili Emery). The ants inhabit the internodes of the tree and feed on nutritive bodies or mullerian bodies. These multicellular corpuscles are produced on the abaxial face of the base of the petiole. This region is covered with a velutinous mat of multicellular but uniseried trichomes called trichilium. The production activity of mullerian 290 bodies and the activity of the ants are synchronous: three hours before the sundown. A Phycitinae caterpillar may occupy the Cecropia internodes and consumes mullerian bodies exclusively. A fungus, Fusarium moniliforme, grows on the trichilium in the absence of ants. The distribution of Cecropia obtusa is homogeneous in space and time but its growth is under control of topographic, edaphic and climatic factors. The comparison between trees occupied by ants and inoccupied ones shows ...

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“…The neotropical genus Cecropia Loefl., includes 61 species, distributed from southern Mexico to northern Argentina, with some species occurring in the Antilles (Wheeler, 1942; Berg, 1978; Berg, 2000; Berg and Franco, 2005; Stevens, 2007). It is the most important genus of pioneer trees in the neotropics; it grows rapidly and ably colonizes gaps (Álvarez‐Buylla and Martínez‐Ramos, 1992; Whitmore, 1998).…”

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Growth pattern and age determination for Cecropia sciadophylla (Urticaceae)

Zalamea

Stevenson

Madriñán

et al. 2008

American J of Botany

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Cecropia species, ranging from Mexico to northern Argentina and the West Indies, are pioneer trees that colonize cleared areas with high light. To determine their ages to help pinpoint the date of the area ' s disturbance, we need to understand their developmental and architectural changes over time. The simple architecture of Cecropia conforms to the model of Rauh; that is, it has orthotropic axes with lateral fl owering and rhythmic branching. The axes are made of a succession of nodes and internodes whose length and associated lateral productions remain measurable for years. Thus, by describing the tree trunk node by node, we can depict the sequence of events involved in tree development. For 25 trees of C. sciadophylla , from two stations in French Guiana and Colombia, we recorded internode length and any presence of branches, and fl owers for each node. Using autocorrelation coeffi cients, we found a high periodicity in fl owering and branching, with infl orescences at every 25 nodes, stages of branches spaced by a multiple of 25 nodes, and alternation of long and short nodes every 25 nodes. Considering that fl owering is annual for many Cecropia species, the main conclusion of this work is that C. sciadophylla has strong annual growth, branching, and fl owering rhythms. In addition, the age of the tree can be estimated retrospectively by observing its adult morphology.

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Espécies de Cecropia da Amazônia Brasileira ()

Cited by 29 publications

References 0 publications

Colonização de clareiras naturais na floresta atlântica no sudeste do Brasil

Colonização de clareiras naturais na floresta atlântica no sudeste do Brasil

La fonction myrmécophile deCecropia obtusaTrecul (Cecropiaceae) en Guyane française

Growth pattern and age determination for Cecropia sciadophylla (Urticaceae)

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