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15 results for “Amazonian savanna”
Data from: Edaphic factors determining the occurrence of herbaceous legumes in Amazonian savannas
Edaphic factors have been indicated as a determinant of the distribution of plant communities in Amazonia. The aim of this study was to detect which edaphic factors determine the occurrence of herbaceous legumes in Amazonian savannas. Therefore, an inventory of herbaceous flora of the family Leguminosae was conducted in 34 permanent plots established in two savanna areas of Roraima, northern Brazilian Amazon. The importance value index was higher for Chamaecrista desvauxii (24.9%), Aeschynomene hystrix (15.7%) and Galactia jussiaeana (10.8%), all having high abundance and wide distribution. The results indicated low density or absence of individuals and species in plots established on poorly drained soils (hydromorphic). Diversity and species richness tended to be higher in habitats formed on well drained soils, greater fertility and lower concentrations of exchangeable aluminum. It is suggested that poor and seasonally flooded soils tend to reduce the chances of occurrence of herbaceous legumes in savanna areas of Roraima, adversely affecting its richness/diversity.
FIGURE 1 in Reproductive and defensive calls of Hydrolaetare schmidti (Anura: Leptodactylidae) from the Amazonian savanna of Amapá in northern Brazil
FIGURE 1. Spectrogram and oscillogram of (A–B) distress calls and (C) advertisement call of Hydrolaetare schmidti from the Amazonian savanna of Amapá in northern Brazil. (A) Typical distress call with clear harmonic structure and (B) distress call with pulsatile structure and without clear harmonic intervals. Male vouchers: CECC 3421 (A and C) and CECC 3422 (B). Calls were produced on different time and frequency scales, because of their distinct temporal and spectral characteristics.
FIGURE 3 in Geographic variation and taxonomy of red-tailed Gymnophthalmus (Squamata: Gymnophthalmidae) from Amazonian Savannas
FIGURE 3. Distribution of individuals of Gymnophthalmus on the morphometric space delimited by the two principal components of females (left) and males (right).
FIGURE 6 in Geographic variation and taxonomy of red-tailed Gymnophthalmus (Squamata: Gymnophthalmidae) from Amazonian Savannas
FIGURE 6. Head scalation of Gymnophthalmus: A) G. vanzoi; B) G. underwoodi; C) G. leucomystax; D) G. pleei. In the schematic drawn on the right, colors highlight the first and second rows of temporals (green), the third row of temporals (blue), and occipitals (red).
FIGURE 1 in Geographic variation and taxonomy of red-tailed Gymnophthalmus (Squamata: Gymnophthalmidae) from Amazonian Savannas
FIGURE 1. Genealogy of Gymnophthalmus and outgroups obtained by Bayesian inference on a matrix of 830 bp long fragments of ribosomal mtDNA. Node supports correspond to posterior probabilities. Northern and Central populations of Amazonian red-tailed Gymnophthalmus are highlighted in red and orange respectively. Scale bar refers to substitutions per site.
FIGURE 4. A in Geographic variation and taxonomy of red-tailed Gymnophthalmus (Squamata: Gymnophthalmidae) from Amazonian Savannas
FIGURE 4. A) Subadult female of red-tailed Gymnophthalmus sp. (27.9 mm of SVL) from Santarém municipality, Pará state, Central Brazilian Amazon; B) Adult female of G. vanzoi (36.2 mm of SVL) from Fazenda Salvamento, Roraima state, Northern Brazilian Amazon, photos: M. Teixeira Jr.
FIGURE 5 in Geographic variation and taxonomy of red-tailed Gymnophthalmus (Squamata: Gymnophthalmidae) from Amazonian Savannas
FIGURE 5. Updated distribution map of South American Gymnophthalmus. Records were compiled from examined material and literature: Hoogmoed, 1973; Cole et al. 1990; Hoogmoed et al. 1992; Gorzula & Señaris, 1999; Kizirian & Cole, 1999; Williamson & Powell, 2004; Hernández-Ruz, 2006; Cole et al. 2013; Ugueto et al. 2013; Meza-Joya & Ramos-Pallares, 2015; Garcia-Pérez & Schargel, 2017; Ribeiro-Júnior & Amaral, 2017; Snyder et al. 2017. Records of Central American Gymnophthalmus are based only on samples used in this work. The reviewed distribution of G. vanzoi is depicted as North Amazon (in red) and Central Amazon (in orange).
Data from: Edaphic factors determining the occurrence of herbaceous legumes in Amazonian savannas
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FIGURE 2 in Geographic variation and taxonomy of red-tailed Gymnophthalmus (Squamata: Gymnophthalmidae) from Amazonian Savannas
FIGURE 2. Haplotype network of ntf3 nuclear fragments inferred by statistical parsimony.
Figure 2 from: Costa-Campos CE, Freire EMX (2019) Richness and composition of anuran assemblages from an Amazonian savanna. ZooKeys 843: 149-169. https://doi.org/10.3897/zookeys.843.33365
Figure 2 Rainfall data and minimum and maximum temperatures at the Experimental Field of the Brazilian Agricultural Research Corporation – EMBRAPA, municipality of Macapá, Amapá State, northern Brazil between January and December 2009, 2010, and 2013.
Figure 5 from: Costa-Campos CE, Freire EMX (2019) Richness and composition of anuran assemblages from an Amazonian savanna. ZooKeys 843: 149-169. https://doi.org/10.3897/zookeys.843.33365
Figure 5 Dendrogram of similarity between the savanna area physiognomies, sampled in the Experimental Field of the Brazilian Agricultural Research Corporation – EMBRAPA, municipality of Macapá, Amapá State. Group A (open woodland savanna, OW), Group B (Parkland savanna, PS), and Group C (grassland savanna, GS and scrub grassland savanna, SG).
Figure 4 from: Costa-Campos CE, Freire EMX (2019) Richness and composition of anuran assemblages from an Amazonian savanna. ZooKeys 843: 149-169. https://doi.org/10.3897/zookeys.843.33365
Figure 4 The species accumulation curves sampled in the savanna area from the Experimental Field of the Brazilian Agricultural Research Corporation – EMBRAPA, municipality of Macapá, Amapá State, northern Brazil, for each of the sampled physiognomies: A grassland savanna B scrub grassland savanna C parkland savanna D open woodland savanna, based on the number of individuals representing the observed (Sobs) and estimated species richness (Jackknife 1).
Figure 1 from: Costa-Campos CE, Freire EMX (2019) Richness and composition of anuran assemblages from an Amazonian savanna. ZooKeys 843: 149-169. https://doi.org/10.3897/zookeys.843.33365
Figure 1 Maps showing the Amapá state and sampling sites in the Experimental Field of the Brazilian Agricultural Research Corporation – EMBRAPA, municipality of Macapá, Amapá State, northern Brazil.
Figure 3 from: Costa-Campos CE, Freire EMX (2019) Richness and composition of anuran assemblages from an Amazonian savanna. ZooKeys 843: 149-169. https://doi.org/10.3897/zookeys.843.33365
Figure 3 Anurans recorded in the savanna area from the Experimental Field of the Brazilian Agricultural Research Corporation – EMBRAPA, municipality of Macapá, Amapá State, northern Brazil: ARhinellamajorBRhinella sp. CR.marinaDBoanamultifasciataEB.punctataFB.ranicepsGDendropsophuscf.walfordiHOsteocephalustaurinusIScinaxfuscomarginatusJS.nebulosusKS.ruberLS.x-signatusMTrachycephalustyphoniusNPseudopaludicolabolivianaOAdenomerahylaedactylaPLeptodactylusfuscusQL.macrosternumRL.pentadactylusSL.podicipinusTPithecopushypochondrialis, and UElachistocleishelianneae.
Figure 6 from: Costa-Campos CE, Freire EMX (2019) Richness and composition of anuran assemblages from an Amazonian savanna. ZooKeys 843: 149-169. https://doi.org/10.3897/zookeys.843.33365
Figure 6 Order by MDS of physiognomies in the savanna area physiognomies, sampled in the Experimental Field of the Brazilian Agricultural Research Corporation – EMBRAPA, municipality of Macapá, Amapá State generated from the Bray-Curtis similarity matrix. Grassland savanna (GS); scrub grassland savanna (SG); parkland savanna (PS); open woodland savanna (OW).
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