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Flora of Baturité, Ceará: a Wet Island in the Brazilian Semiarid
Silvera, Andréa Pereira; Loiola, Maria Iracema Bezerra; Gomes, Vaneicia dos Santos; Lima-Verde, Luiz Wilson; Oliveira, Teógenes SennaThe biota of the humid mountain ranges of the Brazilian semiarid is still poorly understood. In order to fill this scientific gap, we carried out an extensive survey along altitudinal ranges (400m – 1,000 m) on both the windward and the leeward slopes of the Baturité Mountain Range, in the state of Ceará state. We registered 400 plant species and 92 families. The Myrtaceae (36 spp.), Fabaceae (25 spp.), Rubiace...
Assembly rules in a resource gradient: competition and abiotic filtering determ...
Menezes, Bruno Sousa; Martins, Fernando Roberto; Carvalho, Ellen Cristina Dantas; Souza, Bruno Cruz; Silveira, Andrea PereiraThe relative importance of different community assembly mechanisms varies depending onthe environment. According to the stress-dominance hypothesis (SDH), assembly mecha-nisms range from strong abiotic filtering to competition as the environment becomes morefavourable. Most evidence for the SDH comes from studies in gradients of conditions (i.e.abiotic environmental factors that influence the functioning of org...
Phytoliths from soil surfaces and water reservoirs of the Brazilian semi-arid C...
Barroso, Francisco Rony Gomes; Gomes, Vaneicia dos Santos; Carvalho, Carlos Eduardo; Ledru, Marie Pierre; Favier, Charly; Araújo, Francisca SoaresUnderstanding processes that explain phytolith assemblages and their concentration in the soil and sediments is essential to interpret long-term ecological changes. The present study shows modern phytolith assemblages and their relationship with the vegetation cover in the Caatinga biome, state of Cear ́a, northeastern Brazil. We collected recent samples from soil surfaces, in 2015, in three different vegetatio...
When archives are missing, deciphering the effects of public policies and clima...
Ledru, Marie-Pierre; Pieruschka, Vivian Jeske; Bremond, Laurent; Develle, Anne-Lise; Sabatier, Pierre; Martins, Eduardo Sávio Passos RodriguesThe northeastern region of Brazil is the most densely populated and biodiverse semi-arid regions of the planet. Effects of the natural climate variability and colonization on the landscape have been described since the beginning of the 16th century but little is known about their effects on natural resources. Climate projections predict temperatures above 40 °C and an increase in the number and duration of drou...
Landscape Structure Effects on Bee and Wasp Assemblages in a Semiarid Buffer Zone
Flores, Lilian Maria Araujo; Zanette, Lorenzo Roberto Sgobaro; Boscolo, Danilo; Araújo, Francisca SoaresUnderstanding the effects of anthropogenic changes on groups that perform key ecosystem services, such as pollination and pest control, is essential for conservation and maintenance of these groups in landscapes. We aimed to understand how landscape heterogeneity and the natural vegetation loss affect the diversity of bees, wasps and their parasitoids in a resource limited semiarid environment. We sampled bees ...
Why is liana abundance low in semiarid climates?
Carvalho, Ellen Cristina Dantas; Martins, Fernando Roberto; Oliveira, Rafael Silva; Soares, Arlete Aparecida; Araújo, Francisca SoaresLianas are abundant in seasonal tropical forests, where they avoid seasonal water stress presumably by accessing deep-soil water reserves. Although lianas are favoured in seasonal environments, their occurrence and abundance are low in semiarid environments. We hypothesized that lianas do not tolerate the great water shortage in the soil and air characteristic of semiarid environments, which would increase the ...
Hydraulic architecture of lianas in a semiarid climate: efficiency or safety?
Carvalho, Ellen Cristina Dantas; Martins, Fernando Roberto; Soares, Arlete Aparecida; Oliveira, Rafael Silva; Muniz, Celli RodriguesXylem anatomical traits can provide insights regarding the mechanisms affecting the distribution of vascular plants across environmental gradients. In this study, we aimed to investigate the hypothesis that lianas occurring in semiarid environments have characteristics that maximize the xylem resistance to tension-induced cavitation along the root- -stem-branch continuum. To gather information regarding the hyd...
Flora of Baturité, Ceará: a Wet Island in the Brazilian Semiarid
Silvera, Andréa Pereira; Loiola, Maria Iracema Bezerra; Gomes, Vaneicia dos Santos; Lima-Verde, Luiz Wilson; Oliveira, Teógenes SennaThe biota of the humid mountain ranges of the Brazilian semiarid is still poorly understood. In order to fill this scientific gap, we carried out an extensive survey along altitudinal ranges (400m – 1,000 m) on both the windward and the leeward slopes of the Baturité Mountain Range, in the state of Ceará state. We registered 400 plant species and 92 families. The Myrtaceae (36 spp.), Fabaceae (25 spp.), Rubiace...
Composição florística da floresta estacional decídua montana de Serra das Almas...
Lima, Jacira Rabelo; Sampaio, Everardo Valadares de Sá Barretto; Rodal, Maria Jesus Nogueira; Araújo, Francisca Soares– (Flora of seasonal deciduous montane forest at Serra das Almas, Ceará State, Brazil). In the Brazilian semi-arid region, the flora in the sedimentary basins has been poorly studied, but the few surveys already done indicate great floristic and physiognomic heterogeneity. Even neighboring sites may be floristically different. To test this hypothesis, the floristic composition and the biological spectrum of the...
Hydraulic architecture of lianas in a semiarid climate: efficiency or safety?
Carvalho, Ellen Cristina Dantas; Martins, Fernando Roberto; Soares, Arlete Aparecida; Oliveira, Rafael Silva; Muniz, Celli RodriguesXylem anatomical traits can provide insights regarding the mechanisms affecting the distribution of vascular plants across environmental gradients. In this study, we aimed to investigate the hypothesis that lianas occurring in semiarid environments have characteristics that maximize the xylem resistance to tension-induced cavitation along the root- -stem-branch continuum. To gather information regarding the hyd...