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Papers by Polyhanna Gomes
Brazilian Journal of Botany, 2010
Floristic composition and structure of vegetation were studied in two rocky outcrop areas in the ... more Floristic composition and structure of vegetation were studied in two rocky outcrop areas in the semi-arid region of northeastern Brazil. From April 2007 to September 2008, 18 monthly field trips were carried out. Vascular plants were randomly collected throughout the outcrop areas. For structural analysis, 30 plots of 1 × 1 m were set in the vegetation islands. The checklist presented combines 211 species (69 families and 168 genera), although only 56 species were collected in the plots. Fabaceae (18 spp.; 8.5%), Asteraceae (17 spp.; 8%), Orchidaceae (13 spp.; 6.1%), Euphorbiaceae (13 spp.; 6.1%), Bromeliaceae (10 spp.; 4.7%), and Poaceae (eight spp.; 3.8%) are the richest families. Overall, 1,792 shrub and herbaceous specimens were counted in the plots. The Shannon-Wiener (H) diversity index values were 2.572 and 2.547 nats individual-1. The species that presented the highest absolute abundance values (number of plants) had low frequencies in the plots and vice-versa. The biologic...
Due to the scarcity of data on the biotic diversity of rocky outcrops, this work presents the che... more Due to the scarcity of data on the biotic diversity of rocky outcrops, this work presents the checklist of flowering plants (angiosperms) from the Pedra Furada Municipal Park (8°34’30” S, 36°52’45” W; 3 ha), in the northeast region of Brazil. Random samples were carried out from Jan-Dec 1998 and 2004-2009, totaling 125 species and 44 families. Fabaceae (14 spp.), Euphorbiaceae (13), Convolvulaceae (10), Cyperaceae (7), Apocynaceae (6), Cactaceae (6) and Bromeliaceae (5) comprise about 50% of the species. Due to variations in the rock slope and soil depth, the plants are distributed throughout three environments: slopes (65 species), plateaus (39) and escarpments (5), with some of them occurring both in plateaus and slopes (17). Among the species of the park, some are endemic to the caatinga ( e.g. Piptadenia stipulacea and Maytenus rigida ), and others are restricted to rocky outcrop areas ( Ameroglossum pernambucense and Pithecoseris pacourinoides ), providing evidence of the park’...
Rodriguésia
The Serra de Itabaiana National Park, Sergipe, is situated in a transition area between Atlantic ... more The Serra de Itabaiana National Park, Sergipe, is situated in a transition area between Atlantic Forest and the Caatinga and is considered by the Ministério do Meio Ambiente to be extremely important for the conservation of the Atlantic Forest flora. The paucity of floristic information from Sergipe state and areas of ecological tension motivated this floristic survey in the only National Park in the state. Botanical collections were made from 2006 to 2009, in six expedictions, by means of random walking. A total of 552 species distributed in 99 families of angiosperms and one gymnosperm were found. Of the species collected, 187 occurred in shrubby-herbaceous, 304 in shrubby, and 247 in arborescent physiognomy, with 23 common to all physiognomies. Leguminosae (41 spp.), Cyperaceae (40 spp.), Poaceae (38 spp.), Orchidaceae (30 spp.), Euphorbiaceae (27 spp.), Rubiaceae (24 spp.), Melastomataceae (21 spp.) and Bromeliaceae (20 spp.) were the richest families. The study revealed the pre...
Revista Brasileira De Botânica, Jun 1, 2013
We studied the vegetation of two crystalline rock outcrops in the Atlantic Forest of northeastern... more We studied the vegetation of two crystalline rock outcrops in the Atlantic Forest of northeastern Brazil. We recorded typically rupicolous species, which are rare or classified as extremely endangered, such as Aechmea guainumbiorum, found exclusively in one of the study sites. In both areas there was a predominance of therophytes over other life-forms, in contrast to observations made in rock outcrops of the southern Atlantic Forest. Therophytes also stood out in other rock outcrops at similar latitudes as our study site, regardless of the surrounding vegetation. Plants of other life-forms had significantly lower richness and showed adaptations to drought, such as succulent stem, pseudobulbs, dense pilosity, and underground storage organs. Our results suggest that invasive species may modify the vegetation of crystalline rock outcrops, as they change the number of species of all lifeforms in comparison between sites. Hence, our results present the biological identity of these rupicolous habitats, which are marginal to forests, and point to the need for conserving them, in order to protect the Atlantic Forest's biodiversity.
Brazilian Journal of Botany, 2010
Floristic composition and structure of vegetation were studied in two rocky outcrop areas in the ... more Floristic composition and structure of vegetation were studied in two rocky outcrop areas in the semi-arid region of northeastern Brazil. From April 2007 to September 2008, 18 monthly field trips were carried out. Vascular plants were randomly collected throughout the outcrop areas. For structural analysis, 30 plots of 1 × 1 m were set in the vegetation islands. The checklist presented combines 211 species (69 families and 168 genera), although only 56 species were collected in the plots. Fabaceae (18 spp.; 8.5%), Asteraceae (17 spp.; 8%), Orchidaceae (13 spp.; 6.1%), Euphorbiaceae (13 spp.; 6.1%), Bromeliaceae (10 spp.; 4.7%), and Poaceae (eight spp.; 3.8%) are the richest families. Overall, 1,792 shrub and herbaceous specimens were counted in the plots. The Shannon-Wiener (H) diversity index values were 2.572 and 2.547 nats individual-1. The species that presented the highest absolute abundance values (number of plants) had low frequencies in the plots and vice-versa. The biologic...
Due to the scarcity of data on the biotic diversity of rocky outcrops, this work presents the che... more Due to the scarcity of data on the biotic diversity of rocky outcrops, this work presents the checklist of flowering plants (angiosperms) from the Pedra Furada Municipal Park (8°34’30” S, 36°52’45” W; 3 ha), in the northeast region of Brazil. Random samples were carried out from Jan-Dec 1998 and 2004-2009, totaling 125 species and 44 families. Fabaceae (14 spp.), Euphorbiaceae (13), Convolvulaceae (10), Cyperaceae (7), Apocynaceae (6), Cactaceae (6) and Bromeliaceae (5) comprise about 50% of the species. Due to variations in the rock slope and soil depth, the plants are distributed throughout three environments: slopes (65 species), plateaus (39) and escarpments (5), with some of them occurring both in plateaus and slopes (17). Among the species of the park, some are endemic to the caatinga ( e.g. Piptadenia stipulacea and Maytenus rigida ), and others are restricted to rocky outcrop areas ( Ameroglossum pernambucense and Pithecoseris pacourinoides ), providing evidence of the park’...
Rodriguésia
The Serra de Itabaiana National Park, Sergipe, is situated in a transition area between Atlantic ... more The Serra de Itabaiana National Park, Sergipe, is situated in a transition area between Atlantic Forest and the Caatinga and is considered by the Ministério do Meio Ambiente to be extremely important for the conservation of the Atlantic Forest flora. The paucity of floristic information from Sergipe state and areas of ecological tension motivated this floristic survey in the only National Park in the state. Botanical collections were made from 2006 to 2009, in six expedictions, by means of random walking. A total of 552 species distributed in 99 families of angiosperms and one gymnosperm were found. Of the species collected, 187 occurred in shrubby-herbaceous, 304 in shrubby, and 247 in arborescent physiognomy, with 23 common to all physiognomies. Leguminosae (41 spp.), Cyperaceae (40 spp.), Poaceae (38 spp.), Orchidaceae (30 spp.), Euphorbiaceae (27 spp.), Rubiaceae (24 spp.), Melastomataceae (21 spp.) and Bromeliaceae (20 spp.) were the richest families. The study revealed the pre...
Revista Brasileira De Botânica, Jun 1, 2013
We studied the vegetation of two crystalline rock outcrops in the Atlantic Forest of northeastern... more We studied the vegetation of two crystalline rock outcrops in the Atlantic Forest of northeastern Brazil. We recorded typically rupicolous species, which are rare or classified as extremely endangered, such as Aechmea guainumbiorum, found exclusively in one of the study sites. In both areas there was a predominance of therophytes over other life-forms, in contrast to observations made in rock outcrops of the southern Atlantic Forest. Therophytes also stood out in other rock outcrops at similar latitudes as our study site, regardless of the surrounding vegetation. Plants of other life-forms had significantly lower richness and showed adaptations to drought, such as succulent stem, pseudobulbs, dense pilosity, and underground storage organs. Our results suggest that invasive species may modify the vegetation of crystalline rock outcrops, as they change the number of species of all lifeforms in comparison between sites. Hence, our results present the biological identity of these rupicolous habitats, which are marginal to forests, and point to the need for conserving them, in order to protect the Atlantic Forest's biodiversity.