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12 results for “oceanic island flora”
Figs 44–66 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 44–66. Ferocia houkiana Goeyers & Van de Vijver sp. nov. LM and SEM. Campbell Island holotype population, sample BAS284 (BR-4578). LM. 44–49. Several frustules in girdle view, often connected to each other. 50–51. Internal valves. 52–62. Several valves in valve face view clearly showing the central ring of spines. SEM. 63. Frustule in girdle view with the narrow copulae. 64. Frustule in girdle view with the narrow copulae on one side and one the side showing the broad mantle with one indicated rimoportula. 65. External view of a valve face and the girdle. Note the central ring of partly hollow spines. 66. External view of two valves connected via their linking spines. The arrow indicates the Müller step. Scale bars = 10 μm.
Figs 20–27 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 20–27. Angusticopula chilensis (Grunow) Houk et al. SEM. Campbell Island epitype population, sample BAS286. 20–22. SEM view of several valves in girdle view showing the ligulate, open, narrow girdle bands. The arrows indicate the ligulae in Fig. 20, the rimmed mantle edge in Fig. 21 and the fimbriate pars interior of the copulae in Fig. 22. 23. External view of a valve face. 24. External detail of the very fine striae and the small, rounded areolae. 25. Internal view of an entire valve showing the rimoportulae and the thick mantle. 26. External view of the mantle/valve face junction with several openings of the rimoportulae (arrows). 27. Internal detail of the valve mantle with some rimoportulae. Scale bars: 20–23, 25–26 = 10 μm; 24, 27 = 1 μm.
Figs 28–36 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 28–36. Angusticopula cosmica Goeyers & Van de Vijver sp. nov. LM. Campbell Island holotype population, sample BAS303 (BR-4577). 28. Frustule in girdle view showing the discoid chloroplasts. 29. Frustule in valve face view showing the discoid chloroplasts. 30–36. Several valves in valve face view showing clearly the submarginal ring of rimoportulae (arrows) and the striated valve face margin. Scale bar = 10 μm.
Figs 1–19 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 1–19. Angusticopula chilensis (Grunow) Houk et al. LM. Campbell Island epitype population, sample BAS286. 1–6, 12–13. Several frustules in girdle view. 5, 12. Internal valves. 7–11, 14–19. Several valves in valve face view clearly showing the marginal rimoportulae. Scale bar = 10 μm.
Data from: Habitat filtering not dispersal limitation shapes oceanic island floras: species assembly of the Galápagos archipelago
Remote locations, such as oceanic islands, typically harbour relatively few species, some of which go on to generate endemic radiations. Species colonising these locations tend to be a non-random subset from source communities, which is thought to reflect dispersal limitation. However, non-random colonisation could also result from habitat filtering, whereby only a few continental species can become established. We evaluate the imprints of these processes on the Galápagos flora by analysing a comprehensive regional phylogeny for ~ 39 000 species alongside information on dispersal strategies and climatic suitability. We found that habitat filtering was more important than dispersal limitation in determining species composition. This finding may help explain why adaptive radiation is common on oceanic archipelagoes – because colonising species can be relatively poor dispersers with specific niche requirements. We suggest that the standard assumption that plant communities in remote locations are primarily shaped by dispersal limitation deserves reconsideration.
Data from: Habitat filtering not dispersal limitation shapes oceanic island floras: species assembly of the Galápagos archipelago
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Figs 132–138 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 132–138. Arcanodiscus saundersianus Goeyers & Van de Vijver sp. nov. SEM. Campbell Island holotype population, sample BAS272 (BR-4581). 132. Frustule in girdle view with the narrow copulae. The arrows indicate the ligulae. 133. Frustule in girdle view with the narrow copulae. The arrows indicate the fimbriate pars interior of the copulae. Note also the domed valve face. Parts of the upper layer are eroded showing small areolae. 134–135. External valve face views showing the relatively small central area and the well-developed marginal ridges. 136. External view of a valve in girdle view showing the low, almost flat valve face, the absence of marginal ridges and the broad mantle edge. 137. Internal views of an entire valve showing several rimoportulae (arrows). 138. Internal detail of the valve with an indicated rimoportula. Note also the rota on the areolae. Scale bars: 132–137 = 10 μm; 138 = 1 μm.
Figs 67–73 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 67–73. Ferocia houkiana Goeyers & Van de Vijver sp. nov. SEM. Campbell Island holotype population, sample BAS284 (BR-4578). 67–68. Two external valve face views with the typical spines, the rounded to slit like areolae and the Müller step. 69. External girdle view of a valve lacking the typical central ring of spines. Note the spines vestiges that are present in the central area. 70. Internal view of an entire valve showing clearly the central rimoportulae (arrow) and the small central area. 71. Internal view of an entire valve showing clearly the submarginal rimoportulae (arrows). 72. Internal detail of the valve with one rimoportula indicated by the arrow. 73. Internal detail of the valve central area with the central rimoportula. Scale bars: 67, 69–70 = 10 μm; 68, 71 = 5 μm; 72–73 = 1 μm.
Figs 125–131 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 125–131. Arcanodiscus indistinctus Goeyers & Van de Vijver sp. nov. SEM. Campbell Island holotype population, sample BAS303 (BR-4580). 125. Frustule in girdle view with eroded girdle showing the mantle with the parallel ridges. 126. External view of a valve in girdle view showing the domed valve face, several marginal ridges and some of the narrow, unperforated copulae. 127–128. External valve face view of an entire valve. Note the large central area and the striae on the sloping margin. On Fig. 128, note the siliceous outgrowth on the valve face margin. 129. External view of a valve in girdle view showing the domed valve face, the distinct marginal ridges and the narrow mantle edge. 130–131. Internal views of an entire valve showing the lack of rimoportulae. Scale bars = 10 μm.
Figs 116–124 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 116–124. Arcanodiscus crawfordianus Goeyers & Van de Vijver sp. nov. SEM. Campbell Island holotype population, sample BAS303 (BR-4579). 116. Frustule in girdle view. The arrows indicate the fimbriate pars interior of the copulae. 117. External view of a valve in girdle view showing the domed valve face, the marginal spines and some of the narrow, unperforated copulae. 118. External valve face view of an entire valve. Note the spines, the granules in the central area and the striae on the sloping margin. 119. External view of a valve in girdle view showing the domed valve face, the marginal spines, the distinct marginal ridge and the mantle edge bordered by the relatively large groove. 120–121. Several valve face views to show the irregular rings of spines. 122. External detail of the spines and the granules. 123–124. Internal views of an entire valve showing the rimoportulae (arrows). Scale bars: 116, 118–121, 123–124 = 10 μm; 117 = 5 μm; 122 = 1 μm.
Figs 74–115. Three new Arcanodiscus species from Campbell Island. 74–80 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 74–115. Three new Arcanodiscus species from Campbell Island. 74–80. Arcanodiscus crawfordianus Goeyers & Van de Vijver sp. nov. LM. Campbell Island holotype population, sample BAS303 (BR-4579). Several valves in valve face view showing clearly the large central area, the irregularly scattered spines and the marginal striae. 81–96. Arcanodiscus indistinctus Goeyers & Van de Vijver sp. nov. LM. Campbell Island holotype population, sample BAS303 (BR-4580). 81. Frustule in girdle view showing the discoid chloroplasts. 82. Frustule in girdle view. 83–96. Several valves in valve face view. Note the thick mantle in some of the valves and the large central area. 97–115. Arcanodiscus saundersianus Goeyers & Van de Vijver sp. nov. LM. Campbell Island holotype population, sample BAS272 (BR-4581). 97–101. Several frustules in girdle view, often connected to each other. 102–115. Several valves in valve face view. Note the thick mantle in some of the valves and the relatively small central area. The marginal striae are hardly visible in LM. Scale bars = 10 μm.
Figs 37–43 in Revision of the non-marine centric diatom flora (Bacillariophyta) of the sub-Antarctic Campbell Island (southern Pacific Ocean) with the descriptions of five new species
Figs 37–43. Angusticopula cosmica Goeyers & Van de Vijver sp. nov. SEM. Campbell Island holotype population, sample BAS303 (BR-4577). 37. Frustule showing both the valve face and girdle formed by open, narrow copulae. The arrows indicate the ligulae. 38. Detail of the mantle valve with the serrated mantle edge (double arrow) and the ligulate copulae (single arrow). 39. Valve in girdle view showing the striated mantle, the narrow ridge bordering the mantle/valve face junction (black arrows) and the typical groove bordering the mantle edge (double white arrow). 40. External view of a valve face showing the dense pattern of granules. 41. External detail of the very fine striae, the small, rounded areolae and the narrow ridge bordering the valve margin. 42. Internal view of an entire valve showing the rimoportulae and the thick mantle. 43. Internal detail of the valve with some rimoportulae. Scale bars: 37–39, 42 = 10 μm; 40 = 5 μm; 41, 43 = 1 μm.
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.