Papers by Abel Augusto Conceição
Revista Brasileira de Botânica, 2007
Reproductive phenology, pollination and seed dispersal syndromes on sandstone outcrop vegetation ... more Reproductive phenology, pollination and seed dispersal syndromes on sandstone outcrop vegetation in the "Chapada Diamantina", northeastern Brazil: population and community analyses). Vegetation on rock outcrops in the "Chapada Diamantina" (soil islands) is often aggregated and surrounded by nude rock surfaces, thus creating natural units with well defined limits. The flowering and fruiting cycles of plants on 58 soil islands at altitudes between 1,100 and 1,140 meters above sea leavel were analyzed at Mãe Inácia Peak (12°27' S and 41°28' W) in the "Chapada Diamantina", Bahia, Brazil. The presence/ absence of flowering and fruiting species on each soil island, and their respective cover areas were analyzed at both the population and community levels, and the phenophases of flowering and fruiting were observed during 24 successive months. The analyses of pollination and seed dispersal syndromes indicated that animals are more important in pollination than in seed dispersal (which is predominantly by anemochory and autochory). The flowering and fruiting of plants with animal pollination syndromes were correlated with rainfall and temperature. The flowering season varied during the year according to the pollination syndrome involved: entomophily was predominant from summer through autumn, ornithophily was predominant during winter, and anemophily in the spring. The staggered timing of flowering and fruiting among different species provides a nearly continuous supply of resources for the local fauna.
RESUMO -(Ilhas de vegetação em afloramentos de quartzito-arenito no Morro do Pai Inácio, Chapada ... more RESUMO -(Ilhas de vegetação em afloramentos de quartzito-arenito no Morro do Pai Inácio, Chapada Diamantina, Bahia, Brasil). Ilhas de vegetação rodeadas de superfície rochosa foram estudadas em dois platôs do Morro do Pai Inácio (41°28'W e 12°27'S), na Chapada Diamantina. Tais platôs possuem afloramentos de quartzito-arenito entremeados por solos arenosos e ácidos, situados nas porções mais elevadas do Morro, entre 1.100 e 1.170 m acima do nível do mar, sob clima com estação seca bem definida. As ilhas foram assumidas como agrupamentos de uma ou mais espécies de plantas vasculares limitados pela superfície rochosa sem plantas vasculares em toda borda. O estudo incluiu 39 ilhas de vegetação de diferentes tamanhos em cada platô, onde predominaram ervas e arbustos de 63 espécies, sendo 22 comuns a ambos os platôs. Espécies de Liliopsida foram mais numerosas, freqüentes e dominantes, com predomínio das famílias Velloziaceae, Cyperaceae, Orchidaceae, Bromeliaceae e Guttiferae nas ilhas de vegetação em ambos os platôs, assim como a forma de vida caméfita. Foram constatadas riquezas similares nas ilhas de ambos os platôs, sendo a maioria delas formada por até cinco espécies. O agrupamento das espécies utilizando UPGMA e o índice de similaridade de Jaccard revelou quatro grupos, dois deles constituídos por espécies características das ilhas mais expostas ao sol, enquanto outro é constituído por espécies mais relacionadas aos locais mais sombreados e um quarto relacionado a espécies mais generalistas. A associação entre Vellozia hemisphaerica Seub. e Trilepis lhotzkiana Nees mostrou-se típica dos afloramentos do Morro do Pai Inácio. Apenas as famílias Orchidaceae e Cyperaceae estiveram presentes nas duas menores classes de tamanho insular, enquanto Guttiferae, Rubiaceae e Bromeliaceae tiveram maior proporção de ocorrência na maior classe. Diferenças na composição e abundância de espécies entre os platôs sugerem a existência de diferenças ambientais e isolamentos, interferindo na distribuição espacial das espécies nas ilhas de vegetação em cada platô.
Novon, 2009
Catolesia D. J. N. Hind is an endemic, previously monotypic genus (Asteraceae, Eupatorieae) from ... more Catolesia D. J. N. Hind is an endemic, previously monotypic genus (Asteraceae, Eupatorieae) from the campos rupestres of Bahia, Brazil. A second species for the genus, C. huperzioides Roque, H. Robinson & A. A. Conceição, is recognized and described here. It is distinguished from C. mentiens D. J. N. Hind principally by the well-organized terminal synflorescence composed of (7)8 to 12 capitula, of which one is central and larger, its shorter leaves (4-5 mm vs. 7-19 mm in C. mentiens), its white corolla (vs. pink), and the pappus (a brief crown to 0.1 mm vs. mostly absent). Catolesia huperzioides is known only from the municipality of Mucugê and is probably endemic to the Chapada Diamantina Region of Bahia, Brazil.
Reproductive phenology, pollination and seed dispersal syndromes on sandstone outcrop vegetation ... more Reproductive phenology, pollination and seed dispersal syndromes on sandstone outcrop vegetation in the "Chapada Diamantina", northeastern Brazil: population and community analyses). Vegetation on rock outcrops in the "Chapada Diamantina" (soil islands) is often aggregated and surrounded by nude rock surfaces, thus creating natural units with well defined limits. The flowering and fruiting cycles of plants on 58 soil islands at altitudes between 1,100 and 1,140 meters above sea leavel were analyzed at Mãe Inácia Peak (12°27' S and 41°28' W) in the "Chapada Diamantina", Bahia, Brazil. The presence/ absence of flowering and fruiting species on each soil island, and their respective cover areas were analyzed at both the population and community levels, and the phenophases of flowering and fruiting were observed during 24 successive months. The analyses of pollination and seed dispersal syndromes indicated that animals are more important in pollination than in seed dispersal (which is predominantly by anemochory and autochory). The flowering and fruiting of plants with animal pollination syndromes were correlated with rainfall and temperature. The flowering season varied during the year according to the pollination syndrome involved: entomophily was predominant from summer through autumn, ornithophily was predominant during winter, and anemophily in the spring. The staggered timing of flowering and fruiting among different species provides a nearly continuous supply of resources for the local fauna.
RESUMO (Diversidade em quatro áreas de campos rupestres na Chapada Diamantina, Bahia, Brasil: esp... more RESUMO (Diversidade em quatro áreas de campos rupestres na Chapada Diamantina, Bahia, Brasil: espécies distintas, mas riquezas similares) O presente estudo teve como objetivo revelar padrões de diversidade nos campos rupestres, gerando informações úteis à conservação. O estudo desenvolvido em quatro locais na Chapada Diamantina, todos eles em topos de serras e morros, incluiu dois tipos principais de fisionomias abertas:
Phytotaxa, 2014
Vriesea maculosa Mez is a poorly known species with no further recordings since the type collecti... more Vriesea maculosa Mez is a poorly known species with no further recordings since the type collection 101 years ago. As a result of our research about Vriesea as part of the study of the Flora of Bahia, Brazil, new specimens and data are now available for this species justifying an amendment to its description. We provide a complete taxonomical description, including floral details analyzed in freshly collected material. We propose to treat V. fabioi as a new synonym of V. maculosa, and expand on the distribution and phenotypic variation found between populations. The species is illustrated in detail, using line drawings as well as photographs of different populations in the field.
SITIENTIBUS Série Ciências Biológicas, 2012
Acta Botanica Brasilica, 2007
Islands of vegetation on rocky surfaces were studied on two plateaus at Pai Inácio Mountain (41°2... more Islands of vegetation on rocky surfaces were studied on two plateaus at Pai Inácio Mountain (41°28'; 12°27'S) in the Chapada Diamantina. Both plateaus have quartzite-sandstone outcrops interspersed with sandy, acidic soils at the summit between 1,100 and 1,170 meters above sea level, with a well-defined dry season. Islands are defined as clumps of one or more species of vascular plants completely surrounded by a rocky surface devoid of vascular plants. The study included 39 vegetation islands of different sizes on each plateau, with 63 herb and shrub species, of which 22 are common to both plateaus. Liliopsida species had the highest abundance, frequency and dominance, with Velloziaceae, Cyperaceae, Orchidaceae, Bromeliaceae, and Guttiferae families predominating on both plateaus. The chamaephyte life-form was also predominant. Similar species richness was detected on both plateaus, with most of the islands composed of up to five species. Four species groups were revealed using UPGMA and Jaccard´s similarity index, two groups with species typical of sunlit islands, one group with species from shadier sites, and a fourth composed of more generalist species. The Vellozia hemisphaerica - Trilepis lhotzkiana association was typical of rocky outcrops at Pai Inácio Mountain. Orchidaceae and Cyperaceae were the only families present in the two smallest island-size classes, while Guttiferae, Rubiaceae and Bromeliaceae were mostly present in the largest class. Variation in species composition and abundance between the two plateaus suggest environmental and isolation differences affecting the species spatial distribution in the vegetation islands on each plateau.
Soil islands on rocky surfaces often harbor aggregated vegetation that consists of insular plant ... more Soil islands on rocky surfaces often harbor aggregated vegetation that consists of insular plant communities. These islands are typical of the rocky outcrops and in various parts of Brazil form the so-called "campos rupestres" vegetation. Four of such sites have been selected in the state of Bahia, Northeast Brazil, for this comparative study on floristics and vegetation structure: three areas situated inside the "Parque Nacional da Chapada Diamantina" (Guiné, Fumaça and "Gerais da Fumaça") and one is at the border of the Environmental Protection Area of "Marimbus-Iraquara" ("Mãe Inácia"). All occurring vegetation islands were studied in four random plots of 10 × 10 m per site. Soil was often shallow, sandy and acidic. Vascular plant species were determined, with respective life forms and canopy coverage areas. The total number of species when all four sites were added was 135, and the number of species per island varied from 2 to 32. The areas of the 214 soil islands varied from 0.015 to 91.9 m2, totaling 568 m2 in the four sites. Monocotyledon families were dominant, essentially Velloziaceae, as well as Orchidaceae, Bromeliaceae, Amaryllidaceae and Cyperaceae. Among the eudicotyledons, dominant families were mainly Clusiaceae, Asteraceae and Melastomataceae. The biological spectra revealed that phanerophytes and hemicryptophytes predominated among the life forms, while chamaephytes had the largest coverage area. Epilithic and desiccant chamaephytes composed the most conspicuous interspecific associations, and were probably related to early successional processes. Sites closest to one another were not the most similar in structure, indicating that other factors more relevant than distance might be involved in the abundance of species in space.
Novon: A Journal for Botanical Nomenclature, 2009
Catolesia D. J. N. Hind is an endemic, previously monotypic genus (Asteraceae, Eupatorieae) from ... more Catolesia D. J. N. Hind is an endemic, previously monotypic genus (Asteraceae, Eupatorieae) from the campos rupestres of Bahia, Brazil. A second species for the genus, C. huperzioides Roque, H. Robinson & A. A. Conceição, is recognized and described here. It is distinguished from C. mentiens D. J. N. Hind principally by the well-organized terminal synflorescence composed of (7)8 to 12 capitula, of which one is central and larger, its shorter leaves (4-5 mm vs. 7-19 mm in C. mentiens), its white corolla (vs. pink), and the pappus (a brief crown to 0.1 mm vs. mostly absent). Catolesia huperzioides is known only from the municipality of Mucugê and is probably endemic to the Chapada Diamantina Region of Bahia, Brazil.
Brittonia, 2008
A new species of Sauvagesia is described and illustrated under the name Sauvagesia paniculata. Th... more A new species of Sauvagesia is described and illustrated under the name Sauvagesia paniculata. This new species is morphologically similar to the acicularleaved species of the subsect. Vellozianae. However, S. paniculata can be clearly differentiated from the other acicular-leaved species by the paniculate inflorescence. Other diagnostic characters of S. paniculata include the shorter pedicel and longer leaves. This new species seems to be narrowly endemic to the "campo rupestre" vegetation in the Esbarrancado mountain range of Mucugê, in the Chapada Diamantina, Bahia, Brazil.
Acta Botanica Brasilica, 2010
Acta Botanica Brasilica, 2007
RESUMO -(Ilhas de vegetação em afloramentos de quartzito-arenito no Morro do Pai Inácio, Chapada ... more RESUMO -(Ilhas de vegetação em afloramentos de quartzito-arenito no Morro do Pai Inácio, Chapada Diamantina, Bahia, Brasil). Ilhas de vegetação rodeadas de superfície rochosa foram estudadas em dois platôs do Morro do Pai Inácio (41°28'W e 12°27'S), na Chapada Diamantina. Tais platôs possuem afloramentos de quartzito-arenito entremeados por solos arenosos e ácidos, situados nas porções mais elevadas do Morro, entre 1.100 e 1.170 m acima do nível do mar, sob clima com estação seca bem definida. As ilhas foram assumidas como agrupamentos de uma ou mais espécies de plantas vasculares limitados pela superfície rochosa sem plantas vasculares em toda borda. O estudo incluiu 39 ilhas de vegetação de diferentes tamanhos em cada platô, onde predominaram ervas e arbustos de 63 espécies, sendo 22 comuns a ambos os platôs. Espécies de Liliopsida foram mais numerosas, freqüentes e dominantes, com predomínio das famílias Velloziaceae, Cyperaceae, Orchidaceae, Bromeliaceae e Guttiferae nas ilhas de vegetação em ambos os platôs, assim como a forma de vida caméfita. Foram constatadas riquezas similares nas ilhas de ambos os platôs, sendo a maioria delas formada por até cinco espécies. O agrupamento das espécies utilizando UPGMA e o índice de similaridade de Jaccard revelou quatro grupos, dois deles constituídos por espécies características das ilhas mais expostas ao sol, enquanto outro é constituído por espécies mais relacionadas aos locais mais sombreados e um quarto relacionado a espécies mais generalistas. A associação entre Vellozia hemisphaerica Seub. e Trilepis lhotzkiana Nees mostrou-se típica dos afloramentos do Morro do Pai Inácio. Apenas as famílias Orchidaceae e Cyperaceae estiveram presentes nas duas menores classes de tamanho insular, enquanto Guttiferae, Rubiaceae e Bromeliaceae tiveram maior proporção de ocorrência na maior classe. Diferenças na composição e abundância de espécies entre os platôs sugerem a existência de diferenças ambientais e isolamentos, interferindo na distribuição espacial das espécies nas ilhas de vegetação em cada platô.
Acta Botanica Brasilica, 2012
Post-fi re fl owering and fruiting in Vellozia sincorana, a caulescent rosette plant endemic to N... more Post-fi re fl owering and fruiting in Vellozia sincorana, a caulescent rosette plant endemic to Northeast Brazil RESUMO (Floração e frutifi cação depois de fogo em Vellozia sincorana, planta caulescente de roseta endêmica do Nordeste do Brasil). Vellozia sincorana L.B. Sm. & Ayensu é uma espécie endêmica dos campos rupestres ameaçada pela coleta de seus ramos resinosos destinados a acender fogões. A fl oração em massa de V. sincorana observada depois de incêndio em outubro de 1999 suscitou as seguintes perguntas: O fogo afeta a fl oração e frutifi cação de V. sincorana? A altura dos indivíduos é correlacionada com a produção de fl ores e frutos? Um incêndio em 08 de novembro de 2008 foi oportuno para explorar essas questões. Foram monitoradas populações de V. sincorana em duas áreas de campos rupestres em morros no Parque Nacional da Chapada Diamantina (12º31'S -41º29'W; 12 o 36'S -41 o 28'W), uma acometida pelo incêndio de novembro de 2008 e a outra não queimada desde 1999. Em ambas as áreas, 25 indivíduos foram sorteados e monitorados. Os números de fl ores e frutos foram contados e as alturas das plantas foram medidas em nove amostragens realizadas entre 2008 e 2010. Correlação de Spearman e regressão linear foram utilizadas para avaliar a relação entre altura dos indivíduos e a fenologia. Floração e frutifi cação ocorreram apenas na população queimada a menos tempo, cerca de 40 dias depois do fogo e em 24 dos 25 indivíduos monitorados (96%). A quantidade de fl ores e/ou frutos foi positivamente e signifi cativamente correlacionada com a altura das plantas. A abundante fl oração depois do incêndio é um indicativo do fogo como fator que dispara essa fase fenológica. Estimativa da idade de indivíduos altos e eventos de fl oração podem ser utilizados para estimar a frequência do fogo em áreas de populações de V. sincorana, contribuindo para o conhecimento da ecologia do fogo e para conservação biológica e manejo do fogo nos campos rupestres.
Acta Botanica Brasilica, 2013
The species Vellozia sincorana L.B.Sm. & Ayensu is key to biodiversity conservation in the tropic... more The species Vellozia sincorana L.B.Sm. & Ayensu is key to biodiversity conservation in the tropical mountain region of Brazil. The massive post-fire flowering of this endemic species provides a large, episodic supply of floral resources, mostly nectar, to animals.
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Papers by Abel Augusto Conceição