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87 results for “inselberg”
Fig. 8. – A in The extraordinary botanical diversity of inselbergs in Madagascar
Fig. 8. – A. Aloe haworthioides Baker (Asphodelaceae); B. Pachypodium horombense Poiss. (Apocynaceae); C. Quarry on an inselberg near Zazafotsy; D. Leaves of Coleochloa setifera (Ridl.) Gilly (Cyperaceae) sold at local market in Ambalavao. [A: Razafindraibe et al. 293; B: Ramandimbisoa et al. 104] [Photos: A: C. Lebo; B–C: F. Rajaonary; D: S. Porembski]
Fig. 5. – A in The extraordinary botanical diversity of inselbergs in Madagascar
Fig. 5. – A. Actiniopteris dimorpha Pic. Serm. (Pteridaceae) a desiccation-tolerant species of fern at Vohidava, Ihosy; B. Xerophyta sp. (Velloziaceae) near Anjoman'Akona, south of Ambositra; C. Drosera madagascariensis DC. (Droseraceae); D. Utricularia sp. (Lentibulariaceae). [A: Razafindraibe et al. 300; B: Rakotoarivelo et al. 287; C: Rabarimanarivo et al. 745; D: Rabarimanarivo et al. 705] [Photos: A: A. Ramahefaharivelo; B: N. Rakotoarivelo; C– D: S. Giebelmann]
Fig. 4 in The extraordinary botanical diversity of inselbergs in Madagascar
Fig. 4. – Euphorbia horombensis Ursch & Leandri (Euphorbiaceae) a succulent on open rocks at Vohitsanavo inselberg, Anja Park (Fig. 3: nº 23). [Razafindraibe et al. 278] [Photo: S. Porembski]
Fig. 2 in The extraordinary botanical diversity of inselbergs in Madagascar
Fig. 2. – Inselberg in the capital Antananarivo with the "Palais de la Reine". [Photo: S. Porembski]
FIG. 6. — Microananteris inselberg n in The genus Microananteris Lourenço, 2003 in French Guiana (Scorpiones: Buthidae)
FIG. 6. — Microananteris inselberg n. sp., male holotype: A-E, trichobothrial pattern: A, B, chela, dorso-external and ventral aspects; C, D, patella, dorsal and external aspects; E, femur, dorsal aspect; F, sternites V-VII showing spiracles and weak granulation on VII; G, metasomal segments IV-V and telson, lateral aspect. Scale bars: 1 mm.
Fig. 2 in A new species of Linderniella (Linderniaceae) from central Malagasy granitic inselbergs
Fig. 2. – Linderniella porembskii Andriamiar. & Rabarim. [Rabarimanarivo et al. 741] [Photo: S. Giebelmann]
Fig. 1 in A new species of Linderniella (Linderniaceae) from central Malagasy granitic inselbergs
Fig. 1. – Linderniella porembskii Andriamiar.& Rabarim. A. Habit; B. Distal leaf; C. Basal leaf; D. Sepal; E. Corolla (open); F. Staminode; G. Stamens; H. Pistil; I–K. Fruits; L. Seed.
Fig. 1 in The extraordinary botanical diversity of inselbergs in Madagascar
Fig. 1. – Inselberg landscape, near Ambalavao.
Fig. 3 in The extraordinary botanical diversity of inselbergs in Madagascar
Fig. 3. – Map of the inselbergs visited (numbers refer to Table 1)
A new species from an inselberg in the Brazilian Atlantic Forest: <em>Stachytarpheta forzzae</em> (Verbenaceae), supported by morphological, palynological, and anatomical evidence
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Data from: Morphological and genetic evidence for the Stigmatodon goniorachis complex (Tillandsioideae, Bromeliaceae) reveals a new species on inselbergs in the Brazilian Atlantic Forest
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Data from: Habitat diversity associated with island size and environmental filtering control the species richness of rock-savanna plants in neotropical inselbergs
Disentangling the multiple factors controlling species diversity is a major challenge in ecology. Island biogeography and environmental filtering are two influential theories emphasizing respectively island size and isolation, and the abiotic environment, as key drivers of species richness. However, few attempts have been made to quantify their relative importance and investigate their mechanistic basis. Here, we applied structural equation modelling, a powerful method allowing test of complex hypotheses involving multiple and indirect effects, on an island-like system of 22 French Guianan neotropical inselbergs covered with rock-savanna. We separated the effects of size (rock-savanna area), isolation (density of surrounding inselbergs), environmental filtering (rainfall, altitude) and dispersal filtering (forest-matrix openness) on the species richness of all plants and of various ecological groups (terrestrial versus epiphytic, small-scale versus large-scale dispersal species). We showed that the species richness of all plants and terrestrial species was mainly explained by the size of rock-savanna vegetation patches, with increasing richness associated with higher rock-savanna area, while inselberg isolation and forest-matrix openness had no measurable effect. This size effect was mediated by an increase in terrestrial-habitat diversity, even after accounting for increased sampling effort. The richness of epiphytic species was mainly explained by environmental filtering, with a positive effect of rainfall and altitude, but also by a positive size effect mediated by enhanced woody-plant species richness. Inselberg size and environmental filtering both explained the richness of small-scale and large-scale dispersal species, but these ecological groups responded in opposite directions to altitude and rainfall, that is positively for large-scale and negatively for small-scale dispersal species. Our study revealed both habitat diversity associated with island size and environmental filtering as major drivers of neotropical inselberg plant diversity and showed the importance of plant species growth form and dispersal ability to explain the relative importance of each driver.
FIGURE 4 in Gecko on the rocks: an enigmatic new species of Gonatodes (Sphaerodactylidae) from Inselbergs of the Venezuelan Guayana
FIGURE 4. Base of the inselberg where three specimens of the type series of G. infernalis were collected. Note the presence of water even during the dry season.
FIGURE 1 in Gecko on the rocks: an enigmatic new species of Gonatodes (Sphaerodactylidae) from Inselbergs of the Venezuelan Guayana
FIGURE 1. Some Gonatodes species from northern South America: A. Gonatodes alexandermendesi, female, IRSNB 2630 (paratype), Kaieteur National Park, Guyana; B. Gonatodes antillensis, female, Los Roques, Venezuela, uncatalogued; C. Gonatodes annularis, female, La Laja, Sierra de Lema, Bolívar, Venezuela, uncatalogued; D. Gonatodes seigliei, female, Puertas de Miraflores, Venezuela, uncatalogued; E. Gonatodes infernalis sp. nov., female, UTA R-55379. Note the patternless coloration in Gonatodes infernalis compared to the pattern in females of G. alexandermendesi, G. antillensis, G. annularis and G. seiglei. Photographs by Philippe J. R. Kok (A), W. E. Schargel (B, D), C. L. Barrio- Amorós (C) and Carl J. Franklin (E).
FIGURE 5 in Gecko on the rocks: an enigmatic new species of Gonatodes (Sphaerodactylidae) from Inselbergs of the Venezuelan Guayana
FIGURE 5. Principal component scores for specimens of Gonatodes infernalis sp. nov. (solid circles), G. alexandermendesi (inverted triangles), G. annularis (squares), G. ceciliae (crosses), G. concinnatus (triangles) and G. taniae (open circles).
FIGURE 2 in Two new water beetles from the Hantamsberg, an inselberg in the Northern Cape of South Africa (Coleoptera, Hydraenidae)
FIGURE 2. Southern margin of the Hantamsberg plateau, showing its isolation from the surrounding plains. The yellow flower in the foreground is likely Moraea reflexa Goldblatt, endemic to the Hantamsberg. Photo D.T. Bilton.
FIGURE 1 in Two new water beetles from the Hantamsberg, an inselberg in the Northern Cape of South Africa (Coleoptera, Hydraenidae)
FIGURE 1. Habitus and genitalia of Hantamsberg Hydraenidae. A) Mesoceration hantam sp. nov., holotype; B) Parhydraena faeni sp. nov., holotype; C) Mesoceration hantam sp. nov., aedeagus, ventral and lateral view; D) Parhydraena faeni sp. nov., aedeagus ventral and lateral views. Scale bar A–B = 1 mm; C–D = 0.25 mm.
FIGURE 3 in Two new water beetles from the Hantamsberg, an inselberg in the Northern Cape of South Africa (Coleoptera, Hydraenidae)
FIGURE 3. Water beetle habitats on the Hantamsberg plateau, 1,500 m. A) Drying stream pool on gravel on northwest side of plateau; B) pool in stream 1 km north of mast; C) detail of residual pool in same stream system; D) temporary pool on clay/rock with Bulbinella nutans. Photos D.T. Bilton.
FIGURE 3 in Lindernia barthlottii (Linderniaceae), a new species from inselbergs in Madagascar
FIGURE 3. Type locality of Lindernia barthlottii Eb.Fisch. Andriant. & Sieder sp. nov.—A, B. Madagascar, showing the position of the inselberg NW Mandritsara.—C. Inselberg between Ankobakobaka und Ampombilava. Photographs from GoogleEarth ©. Scale bars: A. 400 km, B. 40 km, C. 1 km.
FIGURE 4 in Lindernia barthlottii (Linderniaceae), a new species from inselbergs in Madagascar
FIGURE 4. Lindernia barthlottii Eb.Fisch., Andriant. & Sieder sp. nov.—A, B. Habitat. Photographs: A. Sieder.
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